Area Forecast Discussion
Issued by NWS Pittsburgh, PA
Issued by NWS Pittsburgh, PA
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580 FXUS61 KPBZ 070108 AFDPBZ Area Forecast Discussion National Weather Service Pittsburgh PA 908 PM EDT Thu Jun 6 2024 .SYNOPSIS... An unsettled weather pattern is expected the remainder of the week and through the weekend under a persistent upper trough, resulting in periodic chances of isolated to scattered showers. && .NEAR TERM /UNTIL 6 AM FRIDAY MORNING/... KEY MESSAGES: - Isolated to scattered showers ending this evening. - Mostly dry and seasonable overnight. -------------------------------------------------------------- A few isolated showers continue to the east of Pittsburgh along a crossing boundary. With the showers tied somewhat to the boundary and 30-35 knots of 0-3km shear, a few of the showers have exhibited weak rotation at times this evening, but we have received no reliable reports of funnel clouds. Close attention has been paid given tornadic tilting/stretching parameter in the 1-2 range and with pockets of 100-150 J/kg of 0-3km CAPE, measures which have led to funnel cloud/brief tornadic touchdown in the recent past. The showers will largely end by midnight, with at least a brief period of clearing in most locations before additional clouds begin to arrive by sunrise as troughing settles across the Great Lakes. Low temperatures will be seasonable. && .SHORT TERM /6 AM FRIDAY MORNING THROUGH SATURDAY NIGHT/... KEY MESSAGES: - Persistent upper trough maintains an unsettled pattern - Cooler temperatures expected ------------------------------------------------------------------- An upper low will drift across southeastern Canada and the Great Lakes region Friday through Saturday night. Individual shortwaves rotating around the low will keep an unsettled pattern across the Upper Ohio Valley region through the remainder of the period. A diurnal trend to the cloud cover is expected, with low convective temperatures in place and cool air aloft. One of these shortwaves is expected to cross the Upper Ohio Valley region on Friday, with isolated to scattered showers. Another is expected for Saturday, though the best upper support for any showers is expected to be mainly north of PGH. A stronger shortwave rotating around the low is expected to cross the region Saturday night, with scattered showers across much of the area. Temperatures are generally expected to average around 5 degrees below seasonable levels through the period. && .LONG TERM /SUNDAY THROUGH THURSDAY/... KEY MESSAGES: - Unsettled pattern through mid week under a series of upper troughs - Cool temperatures to start should warm next week ------------------------------------------------------------------- Shortwave troughs rotating around the upper low, mentioned in the short term section of the discussion, will maintain scattered showers on Sunday and Monday, though much of the time in any one location will be dry. Mainly dry weather is expected on Tuesday as the upper low exits the New England coast, and ridging briefly builds in. A shortwave trough is expected to advance eastward from the Plains region Tuesday night, crossing the Upper Ohio Valley region on Wednesday. Scattered showers are expected with the approach and passage of the trough. Temperatures should start out a few degrees below average Sunday and Monday, before returning to near, or above average readings by mid week. && .AVIATION /01Z FRIDAY THROUGH TUESDAY/... Some widely scattered showers forming off of remnant outflow boundaries, which have caused brief shifts in wind direction, will wane after sunset and VFR conditions prevail overnight with light wind 5 knots or less. Wind will increase with mixing on Friday morning out of the west with gusts to 15-20 knots. Diurnal cumulus will develop beneath a building subsidence inversion as high pressure noses in from the southwest. An upper wave will pass by the northern part of our area bringing a chance (30-40%) of scattered showers for the afternoon. There is also a low confidence chance (~30%) of a brief period of MVFR CIGs early Friday morning for FKL but conditions will otherwise remain VFR through the TAF period. .Outlook... Periodic restrictions and scattered showers are then expected through Sunday as a slow moving upper low persists across the Great Lakes region. && .PBZ WATCHES/WARNINGS/ADVISORIES... PA...None. OH...None. WV...None. && $$ SYNOPSIS...CL/88 NEAR TERM...CL/88 SHORT TERM...WM/88 LONG TERM...WM/88 AVIATION...Cermak/MLB