Area Forecast Discussion
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000 FXUS61 KPBZ 211424 AFDPBZ Area Forecast Discussion National Weather Service Pittsburgh PA 1024 AM EDT Wed Mar 21 2018 .SYNOPSIS... Snow should begin to taper off later today as low pressure exits. Dry weather is then expected under high pressure through the rest of the work week. && .NEAR TERM /UNTIL 6 PM THIS EVENING/...
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1015 AM UPDATE...The primary change with this update was to expand the Winter Storm Warning to the rest of Westmoreland County, as multiple 6 inch snowfall reports have been received and an additional 2 to 4 inches is possible. 845 AM UPDATE.. No changes other than minor adjustments to hourly winds/temps/dewpoints needed at this time as the ongoing forecast aligns well with trends. Snow rates will gradually lessen this morning and afternoon as the upper low transitions east and support wanes. Previous... Snow is expected to continue through part of the day as low pressure crosses the OH Valley and Mid Atlantic regions. Will maintain current advisories and warnings as is with the forecast accumulations expected. Coastal sfc low development is expected later today as the mid/upper low nears the E Coast. This should result in snow tapering off from N-S later in the day. Temperatures should be around 15 degrees below seasonal levels.
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&& .SHORT TERM /6 PM THIS EVENING THROUGH FRIDAY NIGHT/... Any remaining snow S of I 70 this evening should end as shortwave ridging builds in. Sfc ridging should maintain dry weather through Friday night, though some increase in clouds is expected Fri as an upper low tracks SE across the NE CONUS. Temperatures are expected to remain 10 to 15 degrees below average. && .LONG TERM /SATURDAY THROUGH TUESDAY/... A shortwave and sfc low is progged to track across the lwr OH and TN Valley regions Sat. Maintained mainly snow chances mainly S of PIT with models in better agreement in keeping most of the precip S of the area. Ridging should return dry weather in the forecast through part of Tue before another trough approaches by mid week. Below average temperatures should gradually warm to near seasonal levels by Tue. && .AVIATION /15Z WEDNESDAY THROUGH SUNDAY/... MVFR cig restrictions with IFR in snow can be expected...with improvement beginning during the afternoon as low pressure transitions east. OUTLOOK... Restrictions, albeit with contd gradual improvement, are likely into Thursday morning. && .PBZ WATCHES/WARNINGS/ADVISORIES...
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MD...Winter Storm Warning until 8 PM EDT this evening for MDZ001. OH...Winter Weather Advisory until 8 PM EDT this evening for OHZ039>041-048>050-057>059-068-069. PA...Winter Weather Advisory until 8 PM EDT this evening for PAZ013- 014-020>023-029-031-075. Winter Storm Warning until 8 PM EDT this evening for PAZ073- 074-076. Winter Weather Advisory until noon EDT today for PAZ007>009- 015-016. WV...Winter Weather Advisory until 8 PM EDT this evening for WVZ001>004-012-021-509. Winter Storm Warning until 8 PM EDT this evening for WVZ510>514.
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