Pittsburgh, Pennsylvania 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
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NWS Forecast for Pittsburgh PA
National Weather Service Forecast for:
Pittsburgh PA
Issued by: National Weather Service Pittsburgh, PA |
Updated: 4:00 am EST Nov 21, 2024 |
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Today
Rain/Snow
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Tonight
Snow Likely
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Friday
Rain/Snow then Rain
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Friday Night
Rain
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Saturday
Rain
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Saturday Night
Slight Chance Rain
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Sunday
Mostly Cloudy
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Sunday Night
Mostly Cloudy
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Monday
Rain Likely
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Hi 39 °F |
Lo 32 °F |
Hi 42 °F |
Lo 40 °F |
Hi 48 °F |
Lo 37 °F |
Hi 50 °F |
Lo 40 °F |
Hi 57 °F |
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Hazardous Weather Outlook
Today
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Rain, possibly mixed with snow. High near 39. Southwest wind 7 to 11 mph. Chance of precipitation is 80%. Little or no snow accumulation expected. |
Tonight
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Snow likely, mainly after 5am. Mostly cloudy, with a low around 32. West wind 9 to 15 mph, with gusts as high as 25 mph. Chance of precipitation is 60%. New snow accumulation of less than one inch possible. |
Friday
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Snow before 10am, then rain. High near 42. West wind 15 to 18 mph, with gusts as high as 31 mph. Chance of precipitation is 100%. New snow accumulation of less than a half inch possible. |
Friday Night
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Rain. Low around 40. Northwest wind 7 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible. |
Saturday
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Rain, mainly before 1pm. High near 48. West wind 11 to 17 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible. |
Saturday Night
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A slight chance of rain. Mostly cloudy, with a low around 37. Chance of precipitation is 20%. |
Sunday
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Mostly cloudy, with a high near 50. |
Sunday Night
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Mostly cloudy, with a low around 40. |
Monday
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Rain likely, mainly after 1pm. Mostly cloudy, with a high near 57. Chance of precipitation is 60%. |
Monday Night
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Rain likely. Mostly cloudy, with a low around 38. Chance of precipitation is 70%. |
Tuesday
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A chance of rain. Mostly cloudy, with a high near 46. Chance of precipitation is 40%. |
Tuesday Night
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Mostly cloudy, with a low around 31. |
Wednesday
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A chance of rain. Partly sunny, with a high near 42. Chance of precipitation is 30%. |
Forecast from NOAA-NWS
for Pittsburgh PA.
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Weather Forecast Discussion
376
FXUS61 KPBZ 211020
AFDPBZ
Area Forecast Discussion
National Weather Service Pittsburgh PA
520 AM EST Thu Nov 21 2024
.SYNOPSIS...
Much colder air will continue to overspread the region today
behind a strong cold front. Low pressure will maintain areas of
snow, possible mixed with rain at times today through Saturday.
Significant snowfall is expected across the Laurel Highlands,
and the higher terrain areas of West Virginia. Light
accumulations are expected elsewhere.
&&
.NEAR TERM /UNTIL 6 PM THIS EVENING/...
KEY MESSAGES:
- Much colder
- Snow, possibly mixed with rain, expected today
------------------------------------------------------------------
The dry slot behind the exiting cold front was quickly filling
in with clouds and patchy light rain with moisture rotating
around an upper low across the Lower Great Lakes/Midwest region.
The low will continue to drift across the Upper Ohio Valley
region through the day, as a surface low rotates around it
across the Lake Michigan region.
Rain and snow will begin to move across the region this morning
under increasing moisture and ascent. Cold advection will
continue through the day, with 850 mb temperatures falling from
current values of -3 deg C, to -8 deg C by evening. Undercut
guidance temps given the cold advection. Much of the
precipitation will change to mainly snow for most areas, with
all snow expected through the day across the higher terrain
areas of PA and WV. The current winter weather headlines begin
at 18Z today, ad this still appears valid.
Initially, wind direction will be more westerly, and this is
less than optimal for maximum upslope flow. The dendritic growth
zone will become saturated in the higher terrain, and this
should result in efficient snow production. Elsewhere, the lower
elevations should be too warm for much accumulation during the
day.
&&
.SHORT TERM /6 PM THIS EVENING THROUGH SATURDAY NIGHT/...
KEY MESSAGES:
- Winter Storm for the higher terrain
- Snow and rain continues elsewhere
-------------------------------------------------------------------
Snow should diminish in coverage this evening for areas outside
of the higher terrain. In the higher elevation, wind direction
will become more favorable for upslope flow. This, combined with
saturation in the dendritic growth region, will result in
efficient snowfall in these areas.
The upper low will begin to shift just east of the region late
tonight and Friday morning. Another surface low will rotate
around it, spreading another round of snow across the region
overnight. A surface trough extending west from the low could
result in a brief enhancement to the snow late tonight and early
Friday morning, especially as some limited lake enhancement
occurs in NW flow behind the trough. This should also be the
period of heaviest snow across the higher terrain as the trough
crosses. Snow should gradually mix with, and change to rain, for
much of the area by Friday afternoon as the boundary layer, and
850 mb temps, warm. The exception will be the higher terrain
areas, where precip type will remain snow.
A tightening pressure gradient, and a low level jet, will result
in gusty wind again on Friday. Gusts from 30-35mph are expected
for most of the area, with gusts up to 45 mph across the highest
terrain areas of WV.
The upper low is progged to be off the Mid Atlantic coast Friday
night, as the surface low rotates across eastern PA and then off
the coast. Rain and snow should decrease in coverage across much
of the area as ascent weakens, and moisture diminishes. The
higher terrain areas will again see mainly snow under continued
upslope NW flow, though some freezing drizzle is possible as
the moisture in the dendritic growth region begins to decrease.
A vorticity maximum will track across the region on Saturday,
with light rain, and possibly snow, especially in the morning.
Diminishing ascent and moisture later in the day and Saturday
night should bring a gradual end to the precip for most of the
region, though NW flow off of the Great Lakes could result in
some light precip chances mainly north of PIT.
Overall snow totals should be around an inch or less for much of
the lower elevation areas, as temperatures will be marginal for
accumulation other than at night. The higher terrain areas are
still expected to see significant accumulations of 6-12 inches,
with 10-15 inches across the highest peaks of WV. All Winter
Weather Advisories and Winter Storm Warning headlines were
maintained as is, with no significant change in the forecast
thinking.
&&
.LONG TERM /SUNDAY THROUGH WEDNESDAY/...
KEY MESSAGES:
- Dry on Sunday
- More unsettled weather returns Monday through at least mid
week
-------------------------------------------------------------------
A ridge of high pressure will track across the Upper Ohio Valley
region Sunday, returning dry weather to the area. Surface low
pressure is expected to track across the Lower Great Lakes
region on Monday, pulling a cold front across the area. This
will return rain chances through the day. An upper trough will
follow the cold front Monday night and Tuesday, with additional
rain expected. The rain could mix with or change to snow in cold
advection before ending.
After the trough exits the region Wednesday morning, model
ensembles indicate flat ridging will return dry weather to the
region. Temperatures should average near seasonable levels for
much of the period.
&&
.AVIATION /10Z THURSDAY THROUGH MONDAY/...
Cigs will decrease early this morning as moisture and cold air,
associated with a large-scale low, slowly advances across the
Great Lakes. Light drizzle/rain has been observed at a few
terminals this morning. However, snow is likely to increase in
coverage from west to east after 13Z.
Periods of IFR or potentially even LIFR visibility in snow are
possible this afternoon. However, confidence in location and
timing of such showers is low at present. Westerly wind gusts
will also pick up into the 15 to 25 knot range during the day.
Outlook...
Restrictions are expected Friday through Saturday as a series
of low pressure systems spin across the NE CONUS, bringing
periods of rain and snow showers to the area. VFR should return
Sunday as high pressure builds in.
&&
.PBZ WATCHES/WARNINGS/ADVISORIES...
PA...Winter Weather Advisory from 1 PM this afternoon to 7 AM EST
Saturday for PAZ009-016-077-078.
Winter Storm Warning from 1 PM this afternoon to 7 AM EST
Saturday for PAZ074-076.
OH...None.
WV...Winter Weather Advisory from 1 PM this afternoon to 7 AM EST
Saturday for WVZ510.
Winter Storm Warning from 1 PM this afternoon to 7 AM EST
Saturday for WVZ511>513.
Winter Storm Warning from 1 PM this afternoon to 7 PM EST
Saturday for WVZ514.
&&
$$
SYNOPSIS...WM
NEAR TERM...WM
SHORT TERM...WM
LONG TERM...WM
AVIATION...Hefferan/CL
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