FXUS61 KPBZ 210351
Area Forecast Discussion
National Weather Service Pittsburgh PA
1151 PM EDT Mon May 20 2019
Dry weather is expected through mid-week under high pressure. Rain
chances return Wednesday evening.
.NEAR TERM /UNTIL 6 AM TUESDAY MORNING/...
Stratocu should persist across much of the area overnight before
building high pressure erodes the clouds from N-S. Wind should also
continue to diminish as the pressure gradient relaxes. Lows are
expected to be around 5 degrees below average.
.SHORT TERM /6 AM TUESDAY MORNING THROUGH THURSDAY NIGHT/...
Dry weather is expected to continue through Tuesday night under high
pressure. Upper ridging will amplify in the ern CONUS mid- week,
with a shortwave ridge axis overhead by Wed morning. This axis will
shift ewd thru the day as a potent trough ejects nnewd from the
The net effect of this ewd shift will be increasing deep swly flow
aloft and a return of warm air and moisture. Shortwave troughs
embedded in the swly flow aloft will interact with the moisture to
yield occasional showers and storms Wed afternoon/evening, and again
Thu afternoon/evening as a frontal boundary approaches.
.LONG TERM /FRIDAY THROUGH MONDAY/...
The sern-CONUS upper ridge is progged to persist through the
weekend, becoming increasingly assertive into the Ohio Valley and
yielding above-average warmth.
Waves traversing the nrn periphery of the ridge may result in
periodic shower and thunderstorm chances through the period, although
the influence of the ridge axis could aid in limiting coverage at
.AVIATION /04Z TUESDAY THROUGH SATURDAY/...
MVFR to low VFR stratocu is expected N of I 70 tonight with moisture
below a temperature inversion. The clouds should erode from N-S late
tonight as subsidence increases under building high pressure. VFR is
then expected through the rest of the TAF period under the high,
though mid level clouds should increase in warm advection.
Restrictions are possible with crossing disturbances late Wed and
Thu, and again Sat.
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