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Hydrometeorological Discussion
Issued by NWS Middle Atlantic RFC

000
AGUS71 KRHA 211401
HMDRHA

HYDROMETEOROLOGICAL DISCUSSION
MIDDLE ATLANTIC RIVER FORECAST CENTER
NATIONAL WEATHER SERVICE STATE COLLEGE PA
 1001 AM EDT TUE MAY 21 2013

SCATTERED SHOWERS AND THUNDERSTORMS FELL MONDAY MAINLY ACROSS PORTIONS
OF VIRGINIA AND WEST VIRGINIA. MOST OBSERVED RAINFALL AMOUNTS WERE
LESS THAN THREE QUARTERS OF AN INCH.

  Value  County                St  Location
   1.70  Augusta               VA  Stuarts Draft F/P Pr
   0.82  Augusta               VA  Craigsville 2s
   0.69  Pocahontas            WV  Bartow
   0.65  Botetourt             VA  Troutville 4.3WNW CO
   0.60  Nelson                VA  Montebello Fish Nurs
   0.56  Botetourt             VA  Glade Creek IFLOWS
   0.47  Sussex                VA  Wakefield ASOS
   0.41  Roanoke               VA  Roanoke AP
   0.40  Craig                 VA  Paint Bank 3E IFLOWS
   0.36  Botetourt             VA  Carvin Creek IFLOWS
   0.36  James City            VA  Williamsburg VA 3.2W
   0.35  Shenandoah            VA  Edinburg
   0.35  Hardy                 WV  Lost River
   0.32  Accomack              VA  Chincoteague
   0.31  Alleghany             VA  Lake Moomaw

HIGH PRESSURE CENTERED OFF THE CAROLINA COAST WILL PROVIDE A
SOUTHWESTERLY FLOW OF VERY WARM AND HUMID AIR THROUGH THURSDAY. A
BACKDOOR COLD FRONT ACROSS NEW YORK STATE WILL DROP SOUTH BRINGING THE
BEST CHANCE OF SHOWERS AND THUNDERSTORMS TODAY TO THE UPPER
SUSQUEHANNA AND UPPER DELAWARE BASINS. RAINFALL AMOUNTS OF ONE QUARTER
TO ONE HALF INCH ARE EXPECTED ACROSS THE NORTHERN BASINS THROUGH
TONIGHT.

AS THE UPPER TROUGH APPROACHES FROM THE WEST LATE WEDNESDAY, SHOWERS
AND THUNDERSTORMS WILL BECOME MORE NUMEROUS ACROSS THE WESTERN
BASINS. RAINFALL AMOUNTS FOR WEDNESDAY ARE EXPECTED TO BE ONE QUARTER
TO ONE HALF INCH.

THE UPPER LOW AND ASSOCIATED COLD FRONT WILL MOVE INTO THE BASINS
THURSDAY AND CONTINUE TOWARDS THE COAST THURSDAY NIGHT. HIGHEST
RAINFALL AMOUNTS OF ONE HALF TO ONE INCH ARE EXPECTED ACROSS EASTERN
PENNSYLVANIA, SOUTHEAST NEW YORK AND NEW JERSEY. POINT AMOUNTS IN
EXCESS OF TWO INCHES ARE POSSIBLE.

DRIER COOLER AIR WILL ARRIVE FRIDAY IN TIME FOR THE HOLIDAY WEEKEND.

ON AREA RIVERS AND CREEKS, GENERALLY MINOR CHANGES ARE EXPECTED
THROUGH WEDNESDAY. MINOR RISES ARE EXPECTED AT MANY LOCATIONS THURSDAY
AND FRIDAY THROUGHOUT THE MID-ATLANTIC REGION. LOCALLY SHARP RISES ARE
POSSIBLE ON SMALLER CREEKS AND STREAMS IN THE VICINITY OF STRONGER
THUNDERSTORMS.

ALL DAILY HYDRO FORECASTS HAVE BEEN ISSUED.

TJR
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