|Dew Point:||17.2°F (-8.2°C)|
|Wind:||From the WNW at 1.0 MPH Gusting to 5.0 MPH|
|Sea Level Pressure:||30.26" (1024.7 mb)|
Mostly ClearLow: 18
SunnyHigh: 30 Low: 24
Partly SunnyHigh: 35 Low: 32
Slight Chance Snow Showers then Mostly CloudyHigh: 36 Low: 32
Chance Snow Showers then Rain And Snow Showers LikelyHigh: 43 Low: 36
Mostly clear, with a low around 18. West wind around 8 mph.
Sunny, with a high near 30. West wind 9 to 16 mph, with gusts as high as 29 mph.
Partly cloudy, with a low around 24. West wind 14 to 18 mph, with gusts as high as 30 mph.
Partly sunny, with a high near 35. Southwest wind 6 to 13 mph.
A slight chance of snow showers after 2am. Mostly cloudy, with a low around 32. South wind around 7 mph. Chance of precipitation is 20%.
A slight chance of snow showers before 8am. Mostly cloudy, with a high near 36. Chance of precipitation is 20%.
A slight chance of snow showers after 3am. Mostly cloudy, with a low around 32.
A chance of snow showers before 8am, then rain and snow showers likely. Mostly cloudy, with a high near 43. Chance of precipitation is 70%. Little or no snow accumulation expected.
Rain showers likely. Cloudy, with a low around 36. Chance of precipitation is 70%.
... Except for a passing snow shower north and east of Pittsburgh Tuesday night, cold and dry weather continues until at least Wednesday.
NEAR TERM /THROUGH TUESDAY/... No changes needed this evening as low clouds persist and will limit overnight temperatures from falling to as low as observed this morning...despite the colder daytime highs. The exception being Garrett, Tucker, and eastern Preston county where minimal clouds will allow for stronger radiational cooling. Prev discussion follows..
PREVIOUS.. A very thin layer of clouds has persisted across nearly all of the forecast area all day long, considering there is a thin layer of moisture, a very strong temperature inversion, and a lack of winds in the vertical profile to mix out the moisture. Erosion of clouds has been noticeable across central Pennsylvania, so perhaps that erosion will work its way into western Pennsylvania. Have stuck with mostly cloudy skies in the forecast until after sunrise Tuesday, when some stronger winds will move into the region and provide some vertical mixing to mix out clouds. Lows will still be below normal, but about 5 degrees warmer than last night due to cloud cover. With some sunshine by the afternoon, daytime highs should be 5 to 7 degrees warmer than today.
SHORT TERM /TUESDAY NIGHT THROUGH THURSDAY/... Weak low pressure will move across Lake Erie and move into New England, dragging a cold front to the southwest. The front itself will be weak, and there will only be limited moisture available with the front. Nevertheless, have added some slight chance and chance pops to the north and east of Pittsburgh. Any light snow that does fall should be to the east by sunrise on Wednesday. Conditions should be dry on Wednesday before another low pressure system approaches the region from the west. The low will be across Michigan Wednesday evening and dissipate as it moves east. This will bring a slight chance of snow showers to all locations Wednesday night into Thursday morning before conditions dry up Thursday afternoon. Temperatures will continue to rise a few degrees each day.
LONG TERM /THURSDAY NIGHT THROUGH MONDAY/... Similar to the midnight shift, continuing to see some differences between the ECMWF and GFS for the extended forecast. There are discrepancies as to how quickly the next low pressure system will arrive, but the system will move from the Gulf Coast Friday morning up to West Virginia Saturday morning. While precipitation may start out initially as snow in some locations late Thursday night and early Friday morning, it should change to all rain by Friday afternoon, and except for locations north of US 422, precipitation should continue as rain Friday night. Again, there are model differences as to how quickly precipitation will depart, and a quick look at the 12Z ECMWF shows that only having a chance of showers on Saturday instead of likely showers may be a bit optimistic. The low will take its time moving to the east, behind which northwest flow will likely set up, allowing for a persistent chance of upslope/lake enhanced showers. Friday will likely be the warmest day of the period with highs in the 40s and lower 50s, and highs will settle back down towards the 40 degree mark by Monday.