Pittsburgh residents can expect a bit of a chill later this week, as per the National Weather Service Pittsburgh PA. In their latest forecast, clear skies and colder nights are on the horizon, with the possibility of frost and freezing conditions threatening the ongoing growing season on Wednesday and Thursday nights. The current conditions, a mix of morning cloudiness and localized fog, should give way to warmer temperatures this afternoon—though some areas might not reach their forecasted highs due to slower cloud dissipation.
According to the National Weather Service, "morning satellite shows a majority of the forecast area covered in stratus as moisture remains stuck underneath a low-level inversion, which could delay the anticipated daytime heating. The weather service's forecast discussion also noted that the combination of diurnal heating and subsidence will help to erode area stratus, but likely at a slower rate than the ensemble model means suggest. As night falls, a dry cold front is projected to cross the area and could increase cloud cover once again, yet without bringing any precipitation.
Moving into the mid-week, the forecast remains dry with high confidence due to persistent high-pressure conditions. Those clear night skies are what could lead to widespread frost and possibly freeze conditions, which might call for frost advisories. The NBM probabilities of temperatures ranging from 32 to 35 degrees are elevated (above 60%) for a large portion of the region, the service stated. Gardeners and farmers should note this especially, as these conditions could signal the end of the growing season for many in the area come Thursday morning.
Looking towards the weekend, temperatures are set to rebound, climbing above average before another system brings the potential for rain on Sunday. A passing trough and its associated cold front over the Great Lakes will likely increase the chance for rain on Sunday, said the National Weather Service. Rainfall predictions vary, but parts of the region could see something between a quarter and to half an inch of rain with this system. More certain, however, is the warmth preceding this wet weather, as clear skies on Friday and Saturday contribute to a toasty start to the weekend.
In terms of aviation, airports in the region might see some morning disruption due to the low cloud cover. However, as these conditions improve throughout the day, the outlook for air travel looks predominantly VFR—Visual Flight Rules—into Saturday. Pilots and travelers should be aware that while the weather starts quietly, the approach of the next cold front could change things up with increased rain and restricted chances toward the end of the weekend.
