Scientific Forecaster Discussion

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Area forecast discussion 
National Weather Service Pittsburgh PA
915 PM EDT sun Apr 20 2014

Synopsis...
high pressure dominates through Monday with warm and dry
conditions. A cold front brings showers Monday night into
Tuesday.

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Near term /through Monday/...
latest satellite imagery continues to show some cirrus streaming across
the region. Dry overnight with temperatures dropping to near
normals. Another mostly sunny day to start the work week with
temperatures near where they were Sunday.

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Short term /Monday night through Wednesday night/...
the warmer than normal regime will continue with high pressure through
Monday as weak warm advection continues.

The approach of a shortwave trough from the western Great Lakes
will increase cloud coverage Monday evening and bring the next
chance of showers associated with a surface cold front early
Tuesday morning through Tuesday evening. Insufficient instability
is diagnosed at this time and therefore have continued to leave
out thunder in the period.

Northwest flow is prognosticated to keep clouds covering much of the
region Wednesday before high pressure begins to clear out clouds
the latter half of the day.

The cold front will lower temperatures to well below average
numbers Tuesday night through the rest of the period.

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Long term /Thursday through Sunday/...
surface ridge will keep dry and seasonal conditions Thursday. A
cold front will approach later Thursday night and cross the region
Friday as upper level closed low slowly works east from the Great
Lakes into eastern Canada next weekend. Scattered showers Friday
followed by cool and unsettled weather for the weekend.

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Aviation /01z Monday through Friday/...
VFR condistions are expected through Monday as high pressure
dominates the area.

Outlook.../Monday through Friday/...
the next chance for restrictions is expected later Monday night and
Tuesday with a cold front.

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Pbz watches/warnings/advisories...
Maryland...none.
Ohio...none.
PA...none.
WV...none.

&&

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