Hydrometeorological Discussion
Issued by NWS Middle Atlantic RFC

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000
AGUS71 KRHA 211345
HMDRHA

HYDROMETEOROLOGICAL DISCUSSION
MIDDLE ATLANTIC RIVER FORECAST CENTER
NATIONAL WEATHER SERVICE STATE COLLEGE PA
 845 AM EST SUN DEC 21 2014

High pressure extending from Eastern Canada into the Mid
Atlantic region through Sunday and provide fair/dry weather.
A weak weather system will develop along the Carolina coast
Monday then creep northward up the east coast.  This weather
system will bring the chance of light precipitation especially
to MARFC`s eastern river basins through 00Z Wednesday.

A stronger upper level trough, increasing PWATs, strengthening
LL jet and associated cold front combining with both Gulf and
Atlantic moisture will bring the chance of a moderate to
locally heavy rain event Wednesday and Wednesday night across
our Hydrologic Service area.

72 hour basin average rainfall ending 12Z Wednesday is expected
to range from a tenth /0.10/ upwards to perhaps /1.00/ inch.
Additional rainfall is likely from 12Z Wednesday through 12Z
Thursday beyond the 72 hour QPF window with the passage of a
cold front.  Indications at this time indicate another three
quarters /0.75/ to one and one half /1.50/ inches of additional
rainfall will be possible.  More exact details to follow early
next week.

Expect only minor rises across smaller streams, creeks and
tributaries through 12Z Wednesday.  More signifcant within within
bankfull rises will be possible beyond 12Z Wednesday across
parts of the Mid Atlantic.  All MARFC river and stream forecasts
will be issued before 11am.

DAS



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