Weather Prediction Center

National Oceanic and Atmospheric Administration

Short Range Forecast Discussion
NWS Weather Prediction Center College Park MD
400 AM EDT Wed Apr 15 2026

Valid 12Z Wed Apr 15 2026 - 12Z Fri Apr 17 2026

...Late season snow for the Cascades and northern Rockies but April heat
for the Mid-Atlantic...

...A slight risk of severe thunderstorms into tonight over from the
southern Plains through the Midwest and into the lower Great Lakes...

...A slight risk of severe thunderstorms on Thursday across the interior
Northeast...

A wavy front continues to undulate across the Great Lakes through New
England. Strong to severe thunderstorms are periodically triggered as low
pressure waves form near the front and then track eastward. Meanwhile, a
strong ridge of high pressure extending west from Bermuda will only allow
the trailing portion of the front to slowly nudge eastward over the next
couple of days. Under this pattern, more strong to severe thunderstorms
will redevelop today and into tonight across the central and southern
Plains mainly to the east of a dryline. The hazards associated with these
thunderstorms are frequent lightning, damaging wind gusts, hail, and a few
tornadoes. By Thursday, this weather pattern will begin to break down
with less widespread coverage of thunderstorms as they move across the
Mid-Mississippi Valley. The wavy front across the Great Lakes and New
England will take one more day to break down. Therefore, strong to severe
thunderstorms are expected to be most active on Thursday across upstate
New York while rounds of showers and embedded thunderstorms will continue
to extend across the lower Great Lakes through interior New England
through Thursday. These thunderstorm activities should finally be
tapering off across the lower Great Lakes Thursday night but they will
continue for New England into Friday morning.

Over the Pacific Northwest, the arrival of a cold front early this morning
is signaling the beginning of a cold snap that will sweep through a good
portion of western U.S. reaching into the northern Plains by Friday
morning. Temperatures will be drastically colder behind this potent front
along with a good dose of mountain snow and windy conditions. A round of
coastal rain will develop along the Northwest Coast through today as well.
Meanwhile, a foot of new snow can be expected along the Cascades and
through the northern Rockies beginning later today, reaching into the
central Rockies by Friday morning. Rain is expected to change over to
snow across the northern Plains behind the cold front early on Friday as a
low pressure system develops over the central High Plains.

The Bermuda High that helps feeding the moisture into the southern Plains
to fuel the thunderstorms will also bring anomalous warmth into the
eastern U.S. Widespread record high temperatures are forecast this
afternoon across the east-central U.S. maximizing with 90-degree-plus heat
over the Mid-Atlantic. The heat is forecast to continue into Thursday
before a slight moderation in temperatures arrives on Friday as the
Bermuda High begins to break down.

Kong



Graphics available at
https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php

Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
358 AM EDT Wed Apr 15 2026

Valid 12Z Sat Apr 18 2026 - 12Z Wed Apr 22 2026


...General Overview...

A welcomed pattern change is expected across the eastern half of
the country in time for the weekend as a strong cold front heralds
the end of the early season heat wave. Hot temperatures across the
East Coast on Saturday will be replaced by more seasonal readings
by the start of next week as a refreshing Canadian surface high
builds into the region. Out West, a new storm system arrives by
Sunday and brings additional rain and mountain snow to the West
Coast states. A broad upper ridge builds between the eastern U.S.
trough and the West Coast system, but not to the same magnitude as
what is currently in place across the country.


...Guidance/Predictability Assessment...

The 00Z model guidance suite features good overall agreement on the
synoptic scale for the end of the week into the weekend, so a
general deterministic model blend works well as a starting point.
The UKMET is still a slower solution with the timing of the cold
front reaching the East Coast this weekend, but not to the same
degree as previous runs. The ensemble means were increased to
about 40-50% by early next week given timing differences with the
next Pacific system and northern stream shortwave energy.

The NBM appeared to be a reasonable starting point for most areas
of the country for temperatures, although values were raised 1-2
degrees from southern Virginia through the Carolinas where there is
stronger support for highs above NBM guidance on Saturday. There
was also a slight increase made within the main QPF axis ahead of
the eastern U.S. cold front.


...Weather/Hazards Highlights...

A strong cold front crossing the Ohio Valley, Mid-South, and into
Texas Saturday is expected to be accompanied by a corridor of
showers and thunderstorms. Greater coverage of convection is likely
from eastern Texas to central Mississippi where better moisture
convergence and instability will exist, and a Marginal Risk of
excessive rainfall will remain valid here for the Day 4/Saturday
outlook. There will likely be a second maxima of heavier rainfall
from Ohio into Pennsylvania, and this area may eventually need a
Marginal Risk area in later outlooks if amounts trend upward. The
Storm Prediction Center is also monitoring the northern Ohio Valley
for the potential of severe weather on Saturday ahead of the
front.

Going into Day 5/Sunday, moderate to locally heavy rainfall
is expected for the Northeast U.S. but appears to be progressive
enough to limit the flood potential. However, a potential
atmospheric river with the next Pacific storm system may produce
enough rainfall across northern California to lead to some 1-2 inch
rainfall on Sunday, and therefore a Marginal Risk area will be
valid here. Mountain snow will also be commonplace for the higher
terrain of the Sierra and the Cascades, and lighter snows for the
northern Rockies.

The record breaking early season heat wave for many areas of the
eastern U.S. will finally be coming to an end by Sunday as the huge
upper ridge gets suppressed, and a cold front brings a return to
conditions more typical of spring to begin next week. The summer-
like heat will persist on Saturday from the Mid-Atlantic to Florida
with highs in the upper 80s to middle 90s, and then by Sunday the
anomalous warmth is confined mainly to the eastern Carolinas and
southward before the entire East Coast gets relief on Monday.
Conditions will turn rather chilly from Michigan to New England
with highs mainly in the 40s to lower 50s, and frost/freeze
conditions at night. Warmth returns to the Plains as highs reach
into the 80s from western Texas to Nebraska by Tuesday.

Hamrick

Additional 3-7 Day Hazard information can be found on the WPC
medium range hazards outlook chart at:
https://www.wpc.ncep.noaa.gov/threats/threats.php

WPC medium range 500mb heights, surface systems, weather grids,
quantitative precipitation forecast (QPF), excessive rainfall
outlook (ERO), winter weather outlook (WWO) probabilities, heat
indices, and Key Messages can be accessed from:

https://www.wpc.ncep.noaa.gov/medr/5dayfcst500_wbg.gif
https://www.wpc.ncep.noaa.gov/medr/5dayfcst_wbg_conus.gif
https://www.wpc.ncep.noaa.gov/5km_grids/5km_gridsbody.html
https://www.wpc.ncep.noaa.gov/qpf/day4-7.shtml
https://www.wpc.ncep.noaa.gov/#page=ero
https://www.wpc.ncep.noaa.gov/wwd/pwpf_d47/pwpf_medr.php?day=4
https://www.wpc.ncep.noaa.gov/heat_index.shtml
https://www.wpc.ncep.noaa.gov/#page=ovw

Hawaii Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
438 AM EDT Wed Apr 15 2026

Valid 00Z Thu 16 Apr 2026 - 00Z Thu 23 Apr 2026

The trades that have been disrupted significantly lately,
associated with the stalled front/shear line emanating from the
strong closed low north of the Island, will begin to return to
more normal by the end of this week and into the weekend as
surface high pressure builds to the north of the state near 40-45N
and the stalled front/shear line dissipates. Model consensus is
for a more normal trade pattern to then persist through much of
the next week.

Models continue to show a new mid to upper level trof forming
along approximately 170W late this week and remaining there
through Saturday before lifting off to the northeast by Sunday
into early next week. At the moment, this trof does not appear
to be a significant precip producer for much of the Islands. Kauai
may see some precip from this trof Sunday into Monday as it gets
kicked eastward. Otherwise, the remainder of the Islands should
see a more typical trades precipitation distribution for much of
the forecast period.

PW values are forecast to remain much above average across the
state through the upcoming period, with values 2 to 3 standard
deviations above the mean. This will support potentially heavier
than normal trades showers into the middle of next week.

Oravec

Excessive Rainfall Discussion
NWS Weather Prediction Center College Park MD
851 PM EDT Tue Apr 14 2026
Day 1
Valid 01Z Wed Apr 15 2026 - 12Z Wed Apr 15 2026

...THERE IS A SLIGHT RISK FOR EXCESSIVE RAINFALL ACROSS PORTIONS OF
THE UPPER MIDWEST TO THE OHIO VALLEY...

... Ohio Valley...
Only minor adjustments were made based on short-term radar imagery
but did not reflect whole-sale change in previous forecast
reasoning. The latest HREF and ARW runs still favored the area
while rainfall and related probability of exceedance from the RRFS
were lower. High seasonable PWATS and abundant instability also
support the potential for high hourly rainfall rates.

...Wisconsin and Michigan...

Made a northward expansion of the Slight risk in parts of
Wisconsin and Michigan in response to short-term trends in radar
and satellite imagery. Given the placement of convecitive
initiation...starting to give more credence to the HREF camp for
overnight convection and risk of excessive rainfall. In particular,
concern involves the potential for storms to expand northeastward
and eastward across Wisconsin and northeast Iowa given favorable
interaction if a warm front at the surface and steep mid-level
lapse rates yielding 1.5 to 2 inch per hour rates in the shorter
term before rates begin to diminish...although areas downstream
have been made more prone to flooding by 3 to 5 inch rainfall
amounts over the past few days. See MPD 0105 for further details.

...Iowa/Illinois...
Expanded the Slight Risk area westward into Iowa in the wake of
one round of showers and thundersotms over the northeast part of
the state due to concern over convective redevelopment. Normally
this would be a candidate for removal from the Slight risk
area...but moist south to southwest flow at low levels over-running
the surface outflow boundary has the potential to ignite addition
storms capable of producing locally intense rainfall rates. If
that scenario is realized...rainfall rates in excess of 1 inch per
hour are possible where 1-hour Flash Flood Guidance is
comparable...with the potential for storms to track along that same
interface into Illinois. See MPD 0106 for further details.


...Central Plains southwestward to the Lower Trans-Pecos/Big
Bend...

...Oklahoma and Kansas...
A broad corridor of moisture and instability is expected to remain
in place overnight...with the HREF and RRFS indicating the
potential for multiple rounds of convectionn firing in proximity to
the dryline. HREF neighborhood probabilties of 24 hour rainfall
exceeding 2 inches are fairly high (50-70%) and 20-40% for
exceeding 3 inches. With a steady stream of PW values of 1.25 to
1.5 inches being advecting northward through the Southern/Central
Plains nearly parallel to the dryline...slow storm motion is
expected, Much as before...this Marginal Risk area was a
southwestward extension of the excessive rainfall outlook areas
over parts of the Upper Midwest/Great Lakes region.

Bann


Day 1 threat area: www.wpc.ncep.noaa.gov/qpf/94epoints.txt

Excessive Rainfall Discussion
NWS Weather Prediction Center College Park MD
403 AM EDT Wed Apr 15 2026
Day 1
Valid 12Z Wed Apr 15 2026 - 12Z Thu Apr 16 2026

...THERE IS A SLIGHT RISK FOR EXCESSIVE RAINFALL FOR THE GREAT
LAKES AND NORTHERN OHIO VALLEY..

Showers and thunderstorms will continue to focus near the west-east
orientated frontal boundary draped across the Ohio Valley/Great
Lakes region into the Northeast as a weak surface low traverses the
boundary and intersects the abundant moisture and instability. Meanwhile,
the longwave trough will finally be making progress toward the
Central Plains and the deep layer moisture axis and instability
shifts slightly eastward. This setup will be conducive for periods
of heavy rainfall. Models are suggesting areal averages of 1 to 3
inches occurring with some overlap with rainfall footprint from
prior days. The Slight Risk remains in effect from northern
Illinois to souther Michigan and northwest Ohio to account for
uncertainty on storm track and the spread of 2 inch HREF 24 hr QPF
neighborhood probability.

...Eastern Oklahoma and the Ozarks...

Convection is expected to become more active during the afternoon
and track generally from the southwest to northeast ahead of the
approaching trough. Eastern Oklahoma into the Ozarks will be in
the right entrance of the jet streak, which will help provide lift.
At the surface, high PWATS and surface instability will once again
prime the atmosphere for hourly rainfall rates of an inch/hr. QPF
guidance does show a maximum of 1-2 inches across the region, but
model guidance shows little to no probability for accumulations
exceeding 2 inches. Therefore, a Marginal Risk is maintained for
the risk area. Additionally, the more flash flood prone Ozark
mountain range is relatively dry.

...Northeast...

Remnants of the storms across the Great Lakes may bring a round of
showers and storms in the morning, followed by another round of
heavier showers and thunderstorms in the afternoon. Model guidance
shows a corridor of 1-1.5 inches rainfall with embedded higher
amounts depending on the model. The relatively lower flash guidance
across western Pennsylvania and the more urban footprint of areas
such as Connecticut and New England also help confidence of
expanding the Marginal eastward.

Campbell/Wilder


Day 1 threat area: www.wpc.ncep.noaa.gov/qpf/94epoints.txt

Excessive Rainfall Discussion
NWS Weather Prediction Center College Park MD
403 AM EDT Wed Apr 15 2026
Day 2
Valid 12Z Thu Apr 16 2026 - 12Z Fri Apr 17 2026

The probability of rainfall exceeding flash flooding guidance is
less than 5 percent.

Campbell

Day 2 threat area: www.wpc.ncep.noaa.gov/qpf/98epoints.txt

Excessive Rainfall Discussion
NWS Weather Prediction Center College Park MD
403 AM EDT Wed Apr 15 2026
Day 3
Valid 12Z Fri Apr 17 2026 - 12Z Sat Apr 18 2026

...THERE IS A SLIGHT RISK FOR EXCESSIVE RAINFALL FOR NORTHERN
MISSOURI, EASTERN IOWA AND NORTHWEST ILLINOIS...

A band of weakening showers and thunderstorms will pass through
the Ohio Valley with the lead shortwave trough. Meanwhile the long
wave trough approaching the Midwest will have better large scale
ascent and instability to yield better areal coverage of QPF with a
more focused swath of higher amounts across Missouri to the
Illinois/Wisconsin border. The previous Slight Risk area was
positioned more over Iowa and Wisconsin, however the latest trends
suggest a modest south/southeast adjustment to northern Missouri,
eastern Iowa, northwest Illinois and extreme southwest Wisconsin.
will be valid from northern Missouri to southwestern Wisconsin for

Campbell
Day 3 threat area: www.wpc.ncep.noaa.gov/qpf/99epoints.txt

Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
126 PM EDT Tue Apr 14 2026


The lead shortwave trough crossing the Ohio Valley on Thursday is
expected to be accompanied by a weakening band of showers and
thunderstorms from the Mid-South to the Ohio Valley. The larger
scale trough and front approaching the Midwest on Day 4/Friday
will have enough dynamics and instability to support more
widespread convective coverage and heavy rainfall from eastern
Kansas to the greater Chicago metro area, and given a better model
signal for potential convective training and heavier rainfall, a
Slight Risk area will be valid from northern Missouri to
southwestern Wisconsin for Friday. A Marginal Risk area will be
valid for Day 5/Saturday across portions of the south-central U.S.
where convection develops ahead of the cold front.

Winter weather will continue to make weather headlines across the
higher terrain of the western U.S. in two distinct rounds. The
trough exiting the northern Rockies will support some lingering
snow from northern Utah/Colorado northward to western Montana
Friday, and some lighter snows for portions of the Dakotas. There
will be a break in the action until late Saturday when the next
storm system arrives in the Pacific Northwest. This is forecast to
produce additional snow for the Cascades and extending to the
northern Sierra by Monday morning, and showers for the lower
elevations and near the coast.

The anomalous and record breaking April heatwave will still be
ongoing Friday across the Eastern U.S., with the greatest
anomalies expected from western New York to Georgia on Saturday.
Widespread lower to even middle 90s are expected Friday across the
lower elevations of the Carolinas, which could set additional daily
records and perhaps come close to some monthly records. This also
holds true going into Saturday as well, although northern portions
of the Mid-Atlantic should get a modest cooling trend with a weak
frontal boundary dropping south. More substantial relief comes by
Sunday as a strong cold front steadily makes its way to the East
Coast, with the hottest conditions mainly confined to the Piedmont
and coastal plain of Virginia and the Carolinas, and then
pleasantly cooler by Monday with the front exiting the coast.

Oudit/Hamrick

Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
126 PM EDT Tue Apr 14 2026


The lead shortwave trough crossing the Ohio Valley on Thursday is
expected to be accompanied by a weakening band of showers and
thunderstorms from the Mid-South to the Ohio Valley. The larger
scale trough and front approaching the Midwest on Day 4/Friday
will have enough dynamics and instability to support more
widespread convective coverage and heavy rainfall from eastern
Kansas to the greater Chicago metro area, and given a better model
signal for potential convective training and heavier rainfall, a
Slight Risk area will be valid from northern Missouri to
southwestern Wisconsin for Friday. A Marginal Risk area will be
valid for Day 5/Saturday across portions of the south-central U.S.
where convection develops ahead of the cold front.

Winter weather will continue to make weather headlines across the
higher terrain of the western U.S. in two distinct rounds. The
trough exiting the northern Rockies will support some lingering
snow from northern Utah/Colorado northward to western Montana
Friday, and some lighter snows for portions of the Dakotas. There
will be a break in the action until late Saturday when the next
storm system arrives in the Pacific Northwest. This is forecast to
produce additional snow for the Cascades and extending to the
northern Sierra by Monday morning, and showers for the lower
elevations and near the coast.

The anomalous and record breaking April heatwave will still be
ongoing Friday across the Eastern U.S., with the greatest
anomalies expected from western New York to Georgia on Saturday.
Widespread lower to even middle 90s are expected Friday across the
lower elevations of the Carolinas, which could set additional daily
records and perhaps come close to some monthly records. This also
holds true going into Saturday as well, although northern portions
of the Mid-Atlantic should get a modest cooling trend with a weak
frontal boundary dropping south. More substantial relief comes by
Sunday as a strong cold front steadily makes its way to the East
Coast, with the hottest conditions mainly confined to the Piedmont
and coastal plain of Virginia and the Carolinas, and then
pleasantly cooler by Monday with the front exiting the coast.

Oudit/Hamrick

Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
253 AM EDT Wed Apr 15 2026

Valid 12Z Wed Apr 15 2026 - 12Z Sat Apr 18 2026


...Cascades...
Day 1...

Strong upper low approaching Vancouver Island this morning will
continue southeastward today, with a lead cold front moving through
the WA Cascades. The heaviest snowfall will be just ahead of the
cold front this morning from the southern WA Cascades into the OR
Cascades. Snow levels will fall from 3500ft ahead of the front to
1000-1500ft behind the front as snow briefly lightens. The trailing
upper low will bring in more light to moderate snow for the region
this afternoon/evening and this will gradually end by tomorrow
morning. WPC probabilities for an additional 6 inches of snow are
>50% above about 2000-2500ft.


...North to Central Rockies and central High Plains...
Days 1-3...

The upper low will cross the Divide on Thursday and split into two
pieces -- the northern portion will continue eastward along the
Canadian border as a weakly closed low while the southern portion
digs through the Great Basin before turning east to the central
Rockies. This will spread snow over much of the region as colder
winter-like air ushers in behind the cold front. With the SW flow
aloft, the central ID ranges, SW MT, and WY ranges will be the
focus for the heaviest snow. By Friday, height falls reach the
western High Plains where a low-level upslope component to the CO
Rockies and adjacent High Plains will promote additional snowfall
in the wake of the cold front. All snow will end around 12Z
Saturday as the trough continues steadily through the Plains to the
Upper Midwest.

For the Northern Rockies, the cold front will reach northwest MT
Wednesday morning with a gradual progression to Wyoming through
Wednesday night. The cold air behind the front is impressive (700mb
temps -12 to -16C) which will plunge temperatures 25-35 degrees
pre- to post-FROPA. Snow levels ahead of the cold front will be
around 5000-6000ft over MT before dropping to 2000-3000ft behind
the front as rates decrease. Snow levels over WY rise to 8000ft in
the warm sector Wednesday before dropping to 3000ft Wednesday night
behind the front. Snow levels around 9000ft in CO on Thursday drop
to 4000-5000ft through the day Friday.

WPC probabilities for at least 8 inches of snow are >50% above
about 5000ft in northern ID/northwest MT and 6000ft in the central
ID ranges. Over southwest MT (Absarokas) to the Tetons, Wind River
Range, and Bighorns, WPC probabilities for at least 8 inches of
snow are >50% above about 7000-9000ft from northwest to southeast.
Over UT into CO, amounts will generally be lighter but at least 6
inches of snow is likely (>50% chance) above about 9000ft. Lighter
amounts (1-2") are expected along/east of the Front Range into
metro Denver as rain turns to snow Friday evening.

As a final note, the sharp cold front should produce snow squalls
or convective snow bands along/ahead of it today and Thursday. This
activity could cause short-lived but impactful drops in visibility
and hazardous travel.


The probability of significant icing for days 1-3 across the CONUS
is less than 10 percent.


Fracasso

Extended Forecast Discussion
NWS Weather Prediction Center College Park MD
358 AM EDT Wed Apr 15 2026

Valid 12Z Sat Apr 18 2026 - 12Z Wed Apr 22 2026


...General Overview...

A welcomed pattern change is expected across the eastern half of
the country in time for the weekend as a strong cold front heralds
the end of the early season heat wave. Hot temperatures across the
East Coast on Saturday will be replaced by more seasonal readings
by the start of next week as a refreshing Canadian surface high
builds into the region. Out West, a new storm system arrives by
Sunday and brings additional rain and mountain snow to the West
Coast states. A broad upper ridge builds between the eastern U.S.
trough and the West Coast system, but not to the same magnitude as
what is currently in place across the country.


...Guidance/Predictability Assessment...

The 00Z model guidance suite features good overall agreement on the
synoptic scale for the end of the week into the weekend, so a
general deterministic model blend works well as a starting point.
The UKMET is still a slower solution with the timing of the cold
front reaching the East Coast this weekend, but not to the same
degree as previous runs. The ensemble means were increased to
about 40-50% by early next week given timing differences with the
next Pacific system and northern stream shortwave energy.

The NBM appeared to be a reasonable starting point for most areas
of the country for temperatures, although values were raised 1-2
degrees from southern Virginia through the Carolinas where there is
stronger support for highs above NBM guidance on Saturday. There
was also a slight increase made within the main QPF axis ahead of
the eastern U.S. cold front.


...Weather/Hazards Highlights...

A strong cold front crossing the Ohio Valley, Mid-South, and into
Texas Saturday is expected to be accompanied by a corridor of
showers and thunderstorms. Greater coverage of convection is likely
from eastern Texas to central Mississippi where better moisture
convergence and instability will exist, and a Marginal Risk of
excessive rainfall will remain valid here for the Day 4/Saturday
outlook. There will likely be a second maxima of heavier rainfall
from Ohio into Pennsylvania, and this area may eventually need a
Marginal Risk area in later outlooks if amounts trend upward. The
Storm Prediction Center is also monitoring the northern Ohio Valley
for the potential of severe weather on Saturday ahead of the
front.

Going into Day 5/Sunday, moderate to locally heavy rainfall
is expected for the Northeast U.S. but appears to be progressive
enough to limit the flood potential. However, a potential
atmospheric river with the next Pacific storm system may produce
enough rainfall across northern California to lead to some 1-2 inch
rainfall on Sunday, and therefore a Marginal Risk area will be
valid here. Mountain snow will also be commonplace for the higher
terrain of the Sierra and the Cascades, and lighter snows for the
northern Rockies.

The record breaking early season heat wave for many areas of the
eastern U.S. will finally be coming to an end by Sunday as the huge
upper ridge gets suppressed, and a cold front brings a return to
conditions more typical of spring to begin next week. The summer-
like heat will persist on Saturday from the Mid-Atlantic to Florida
with highs in the upper 80s to middle 90s, and then by Sunday the
anomalous warmth is confined mainly to the eastern Carolinas and
southward before the entire East Coast gets relief on Monday.
Conditions will turn rather chilly from Michigan to New England
with highs mainly in the 40s to lower 50s, and frost/freeze
conditions at night. Warmth returns to the Plains as highs reach
into the 80s from western Texas to Nebraska by Tuesday.

Hamrick

Additional 3-7 Day Hazard information can be found on the WPC
medium range hazards outlook chart at:
https://www.wpc.ncep.noaa.gov/threats/threats.php

WPC medium range 500mb heights, surface systems, weather grids,
quantitative precipitation forecast (QPF), excessive rainfall
outlook (ERO), winter weather outlook (WWO) probabilities, heat
indices, and Key Messages can be accessed from:

https://www.wpc.ncep.noaa.gov/medr/5dayfcst500_wbg.gif
https://www.wpc.ncep.noaa.gov/medr/5dayfcst_wbg_conus.gif
https://www.wpc.ncep.noaa.gov/5km_grids/5km_gridsbody.html
https://www.wpc.ncep.noaa.gov/qpf/day4-7.shtml
https://www.wpc.ncep.noaa.gov/#page=ero
https://www.wpc.ncep.noaa.gov/wwd/pwpf_d47/pwpf_medr.php?day=4
https://www.wpc.ncep.noaa.gov/heat_index.shtml
https://www.wpc.ncep.noaa.gov/#page=ovw