Pittsburgh residents should keep their umbrellas close as the National Weather Service in Pittsburgh predicts a damp scenario unfolding over the city. According to the latest Area Forecast Discussion, a weak low-pressure system will bring rain this afternoon through Wednesday, with chances of additional precipitation as the weekend approaches. This means cooler temperatures, likely below normal, until next week begins.
In terms of immediate effects, the rain is expected to favor areas east of I-79 starting this afternoon and rolling into the evening. While conditions may dampen Pittsburgh spirits, flooding risks remain low. A notable moisture surge is raising PWAT values, which typically raises flood concerns. However, with minimal instability and weak surface lift on the cards, the risks are mitigated, keeping anticipated precipitation rates low enough to delay the onset of heavier rains.
Moving into midweek, Wednesday still looks wet, with scattered to numerous rain showers persisting, as mentioned in the same report by the National Weather Service Pittsburgh. However, things are looking up for Thursday, with the weather favoring drier conditions and a glimpse of sunshine to aid in shaking off the chill, as temperatures approach average levels after lingering around 10 degrees below average on Wednesday.
Looking at the weekend, the ensemble models foresee a sagging upper-level trough axis inching from the Central Plains, possibly merging with a rush of Canadian energy to fuel increased rain chances Friday into Saturday. However, things are not entirely bleak as rapid temperature rebounds are anticipated for Sunday and Monday, likely leading to a much-awaited warm start to the following workweek.
Aviation operations may also encounter hurdles, as rain is forecasted to arrive around 18z for the southern TAF sites, such as ZZV and MGW, gradually spreading to the I-70 corridor by 00z. The weather service warns of potential Low Level Wind Shear tonight for the PIT AGC MGW and LBE areas due to a south to southeast 850 mb wind maximum. IFR conditions are expected to blanket the area by late tonight, creating potential visibility issues for flyers.
Despite the rainy forecast, no watches, warnings, or advisories are currently in place for Pennsylvania, Ohio, or West Virginia, according to the latest advisory from the National Weather Service in Pittsburgh. While the weather may dictate a slower pace and require occasional indoor retreats, residents should find solace in the transient nature of these spring showers.
