Area Forecast Discussion
Issued by NWS Pittsburgh, PA
Issued by NWS Pittsburgh, PA
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401 FXUS61 KPBZ 070830 AFDPBZ Area Forecast Discussion National Weather Service Pittsburgh PA 430 AM EDT Sun Jul 7 2024 .SYNOPSIS... Dry weather is anticipated to continue into Monday under high pressure. Fog potential this morning north of Pittsburgh, PA. Active weather returns by Tuesday and Wednesday associated with a passing trough and the remnants of Beryl. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... KEY MESSAGES: - Dry conditions and mostly seasonable temperatures today. - Fog potential this morning through mid morning. ------------------------------------------------------------------- Clear skies have set up across the area and radiational fog may develop for portions of the region, especially in the river valleys through dawn. Hi- Res model guidance are focusing heavily near the I-80 region for fog due to elevated sfc moisture. High pressure will remain over the region for today making for mainly clear skies with a few instances of afternoon cu. Temperatures for today will be slightly warmer than Saturday with slight warm advection aloft and diurnal mixing under a mostly clear sky. Temperatures will trend 5 degrees above the climatological average; heat index values south of Pittsburgh are anticipated to be near 90F. && .SHORT TERM /6 PM THIS EVENING THROUGH MONDAY NIGHT/... KEY MESSAGES: - High probability for dry weather tonight and most of Monday. - Fog potential for Monday morning. ------------------------------------------------------------------- With sufficient low level moisture, light wind, and mostly clear skies, early morning fog development could occur into Monday morning. Heading into the day on Monday, high pressure positioned off the east coast will make for southwesterly flow into the southern counties of the forecast area. A passing trough aloft to the south may be enough to spawn a few showers or storms into Preston and Tucker Counties for Monday afternoon. With a noted 590dm heights at 500mb and 850mb temperatures around 20C by Monday, daytime highs temperatures are expected to range in the low to mid-90s across the region. A return in moisture and warmer temperatures will lead to Heat Index values in the 95 to 99 degree range. This has been mentioned in the HWO. && .LONG TERM /TUESDAY THROUGH SATURDAY/... KEY MESSAGES: - Unsettled weather returns Tuesday through Wednesday night. ------------------------------------------------------------------- Ensemble consensus continues to favor an Upper Midwest trough passing through the Great Lakes region Tuesday into Wednesday morning along with a weak surface trough. Moist advection ahead of the wave is likely to foster a warm, humid environment translating to likely showers and thunderstorms ahead of the feature. Environmental conditions remain varied, but with ensemble means showing near 90F highs and 70F dewpoints, there appears to be at least a low probability for flash flood risk and potential other severe hazards. Latest CSU machine learning output supports this. Variations become post-shortwave passage depending on high pressure strength to the north as well as potential pattern impact from the remnants of Hurricane Beryl. The trend currently is, the core of the tropical low to lift north into the Great Lakes by Wednesday. This will likely lead to the main rainfall threat on Wednesday. The main takeaways for the long range period is that 500mb mean heights suggest a continuation of near to above normal temperature and precipitation chances tied to shortwave movement. Trends are difficult to pin down at this time and low confidence is the take away as the ridge off the coast keeps the trough and merged remnants of Beryl over the Mid Atlantic a bit longer keeping low chance pops in the forecast for Thursday through Saturday. Otherwise, high pressure would keep the area dry to end the period on Saturday. && .AVIATION /08Z SUNDAY THROUGH THURSDAY/... Lower confidence continues on peri-dawn fog development. Have continued with fog mention at LBE/MGW/ZZV/FKL where probabilities are highest. Any fog will largely dissipate by 12Z, leaving VFR conditions for Sunday, with scattered afternoon cumulus development once again. A weaker surface pressure gradient will lead to lighter wind, with W/NW wind remaining under 10 knots. .Outlook... General VFR continues through Monday. Scattered showers and thunderstorms return Tuesday through Thursday with brief, related restrictions. && .PBZ WATCHES/WARNINGS/ADVISORIES... PA...None. OH...None. WV...None. && $$ SYNOPSIS...Hefferan/Shallenberger NEAR TERM...Hefferan/Shallenberger SHORT TERM...Shallenberger LONG TERM...Shallenberger AVIATION...Rackley/McMullen