Area Forecast Discussion
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FXUS61 KPBZ 290939

Area Forecast Discussion
National Weather Service Pittsburgh PA
539 AM EDT Mon May 29 2017

Weak high pressure will keep Memorial Day mostly dry with
seasonable temperatures.


Showers associated with an exiting cold front will diminish by
mid-morning as high pressure builds back in out of the west.
Temperatures will be near normal.

Dry conditions will be short-lived as the next shortwave
transitioning through the upper trough parked over the Great
lakes rounds the base of the trough and scattered showers begin
to develop over the forecast area by early evening.

Temperatures should be close to or just above seasonal norms.


Scattered showers will continue on Tuesday as a cold front
crosses the forecast area. Have opted to include mention of
thunder late afternoon / early evening, however, at this time
instability is progged to be marginal. Dry conditions will
follow tuesday night as drier air moves in behind the front.


Unsettled conditions will continue the remainder of the week
with no change in the longwave pattern and shortwaves moving
within the aforementioned upper trough impact the area.

By next weekend, the upper pattern becomes more zonal, and a
frontal boundary could stall out somewhere near or in our
region. This boundary could provide more focused rainfall
chances, but its placement remains in question. Temperatures
will remain near or just a few degrees below normal.


A few showers and areas of MVFR/local IFR should continue ahead
of a cold front, though a rapid clearing trend and return to
VFR is expected as the front crosses. Surface high pressure
ridging should maintain the VFR conditions through the evening.
A wind shift from SW to W is expected with FROPA, with backing
winds this eve ahead of a weak approaching shortwave.

Restrictions are possible Tue/Wed with an upper trough, and
again Fri with low pressure.




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