Area Forecast Discussion
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FXUS61 KPBZ 250107

Area Forecast Discussion
National Weather Service Pittsburgh PA
907 PM EDT TUE MAY 24 2016

Mostly dry weather is expected through Wednesday. A weak
disturbance will provide a chance of rain starting Wednesday
night. A slow warming trend will continue through Friday.


With 9pm update, minimal changes were made to sky cover and
hourly trends for temperature. Some cirrus will quickly move over
the region this evening, but skies should then clear out for a
time again.

The upper ridge shifts east on Wednesday, and increasing
southwest flow will start the process of increasing dewpoints.
More diurnal cumulus are expected. Although low-level instability
will start to increase, a mid-level cap will keep convection at
bay for much of the area. Southeast Ohio may get just moist enough
to break the cap for a few isolated showers and storms after 18Z,
and have slight chance PoPs here. With rising 500 mb heights and
850 mb temperatures, we expect afternoon highs to be a few degrees
warmer than today. CL


A weak shortwave trough in the midst of an unstable atmosphere is
progged to slowly pass on Thursday. Hence, showers and thunderstorms
are expected to develop in the afternoon and evening.

Unstable conditions will continue into Friday as the broad ridge of
high pressure strengthens and terrain driven diurnal thunderstorms

Very warm and humid conditions are expected through the period via
southwest flow with temperatures forecast to be at least 10 degrees
above average. Have used a blend of GFS, NAM, and WPC guidance for
temperatures as a broad and anomalously strong ridge pattern holds
across the region.


The ensemble members continue to be in good agreement that the
aforementioned ridge enhances. Above average temperatures with
humid conditions are expected. Saturday appears to be the warmest
day of the period as the ridge axis is progged to be very near or
directly over the forecast area while mid-level heights have
reached their maxima.

The overall broad ridge of anomalously high pressure over the
Eastern US remains certain through the period and thus near WPC
values for temperatures were used. Diurnal convection can be
expected each day and so chance pops have been maintained.


VFR into Wednesday afternoon underneath high pressure. West winds
under 10 kts this evening will become southwest under 5 kts

The next chance for restrictions will come with the advance and
passage of a disturbance wednesday evening and Thursday.




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