000
AGUS71 KRHA 091507
HMDRHA
HYDROMETEOROLOGICAL DISCUSSION
MIDDLE ATLANTIC RIVER FORECAST CENTER
NATIONAL WEATHER SERVICE STATE COLLEGE PA
1006 AM EST TUE FEB 09 2010
...ANOTHER MAJOR SNOWSTORM WILL AFFECT THE AREA THROUGH WEDNESDAY...
SNOW ACROSS SOUTHWEST VIRGINIA THIS MORNING WILL SPREAD NORTHEASTWARD
THROUGH THE REMAINDER OF THE SERVICE AREA BY LATE TONIGHT AS LOW
PRESSURE TRACKS TOWARD THE NORTH CAROLINA COAST. LISTED BELOW ARE THE
HIGHEST OBSERVED PRECIPITATION AMOUNTS THROUGH 7AM THIS MORNING.
Value County St Location
0.21 Montgomery VA Blacksburg 0.4N COCO
0.17 Roanoke VA Roanoke 8N
0.14 Botetourt VA Buchanan
0.08 Roanoke VA Roanoke AP
0.05 Raleigh WV Beckley AP
0.04 Campbell VA Lynchburg AP
0.03 Greenbrier WV Lewisburg
0.02 Cayuga NY Locke
0.02 Tompkins NY Freeville 2.6N COCO
0.02 Onondaga NY Syracuse AP
0.02 Bedford VA Moneta 4.5SSW COCO
0.01 Pocahontas WV Bartow
0.01 Broome NY Binghamton AP
0.01 Delaware NY Cannonsville Res.
0.01 Pocahontas WV Frost
SNOW WILL BECOME HEAVY AT TIMES THIS AFTERNOON ACROSS WEST VIRGINIA
AND WESTERN VIRGINIA. HEAVY SNOW WILL MOVE THROUGH NORTHERN MARYLAND
AND INTO SOUTHERN PENNSYLVANIA THIS EVENING THEN INTO NEW JERSEY
OVERNIGHT.
FURTHER SOUTH, A PERIOD OF RAIN IS POSSIBLE LATER TODAY SOUTH OF A
LINE FROM ROANOKE TO FREDERICKSBURG. THIS MAY CAUSE SOME RUNOFF IN THE
APPOMATTOX AND LOWER JAMES BASINS, HOWEVER, ANY RISES SHOULD BE
MINOR. RAIN MAY MIX AS FAR NORTH AS CENTRAL DELAWARE AND SOUTHERN NEW
JERSEY BY EARLY WEDNESDAY MORNING BUT SHOULD HAVE LITTLE EFFECT ON THE
RIVER BASINS.
OTHER THAN MINOR RISES ON THE APPOMATTOX AND LOWER JAMES BASINS
THROUGH WEDNESDAY NIGHT, ONLY MINOR STAGE CHANGES ARE EXPECTED FOR THE
REST OF THE SERVICE AREA.
ALL HYDRO FORECASTS HAVE BEEN ISSUED BY MARFC. ANY COMMENTS OR
SUGGESTIONS, LET US KNOW.
TJR
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000
AGUS71 KRHA 081514
HMDRHA
HYDROMETEOROLOGICAL DISCUSSION
MIDDLE ATLANTIC RIVER FORECAST CENTER
NATIONAL WEATHER SERVICE STATE COLLEGE PA
1014 AM EST MON FEB 08 2010
...ANOTHER SIGNIFICANT SNOWSTORM IS ON THE WAY...
HIGH PRESSURE WAS RESPONSIBLE FOR MAINLY DRY WEATHER SUNDAY. THE ONLY
MEASURABLE PRECIPITATION WAS LIGHT LAKE EFFECT SNOW ACROSS THE UPPER
SUSQUEHANNA BASIN. PRECIPITATION AMOUNTS THROUGH 7AM THIS MORNING WERE
LESS THAN ONE TENTH INCH.
Value County St Location
0.06 Tompkins NY Ithaca 3ENE
0.05 Tompkins NY Slaterville Spgs 1S
0.02 Cayuga NY Locke
0.02 Somerset PA Mount Davis
0.02 Cortland NY Marathon 0.7NW COCO
0.02 Tompkins NY Freeville 1.5NE COCO
0.02 Tompkins NY Freeville 2.6N COCO
0.01 Broome NY Binghamton AP
0.01 Cortland NY Cincinnatus
0.01 Delaware NY Delhi
0.01 Wayne PA Equinunk 2WNW
0.01 Delaware NY East Sidney Dam
0.01 Sullivan PA Laporte
0.01 Chenango NY Norwich
0.01 Madison NY Earlville 0.4W COCO
HIGH PRESSURE WILL SLIDE ACROSS THE REGION TODAY WITH MORE SUNSHINE
AND DRY WEATHER.
AS HIGH PRESSURE MOVES OFF THE COAST LATE TONIGHT, ANOTHER AREA OF
DEVELOPING LOW PRESSURE WILL APPROACH FROM THE SOUTHWEST.
SNOW WILL ARRIVE IN THE UPPER JAMES BASIN EARLY TUESDAY MORNING, THEN
SPREAD NORTHEASTWARD ACROSS THE REMAINDER OF THE AREA THROUGH TUESDAY
NIGHT. ANOTHER SIGNIFICANT SNOWSTORM CAN BE EXPECTED ACROSS NORTHERN
VIRGINIA, MUCH OF MARYLAND AND DELAWARE, NEW JERSEY, SOUTHERN AND
EASTERN PENNSYLVANIA AND SOUTHEAST NEW YORK. BY LATE WEDNESDAY,
SNOWFALL AMOUNTS IN THESE AREAS ARE EXPECTED TO BE GREATER THAN 6
INCHES, AND LOCALLY OVER 1 FOOT IN EASTERN PENNSYLVANIA, NORTHERN
DELAWARE, NEW JERSEY AND SOUTHEAST NEW YORK.
AS THE LOW TRACKS THROUGH NORTHERN NORTH CAROLINA AND OFF THE COAST
TUESDAY AFTERNOON AND NIGHT, IT WILL BE WARM ENOUGH FOR A PERIOD OF
RAIN AS FAR NORTH AS ROANOKE TO FREDERICKSBURG TO DOVER TO ATLANTIC
CITY. THIS WILL CAUSE RUNOFF AND MINOR RISES IN THE LOWER APPOMATTOX,
LOWER JAMES, LOWER RAPPAHANNOCK AND PERHAPS A BASIN OR TWO IN SOUTHERN
NEW JERSEY. ELSEWHERE, NO RUNOFF IS EXPECTED FROM THE SNOW, BUT WATER
EQUIVALENTS ON THE GROUND WILL CONTINUE TO INCREASE.
ON A SIDE NOTE, THE COLDER THAN NORMAL WEATHER OVER THE WEEKEND HAS
LED TO ICE EFFECTS ON GAGES IN SOME OF THE SMALLER CREEKS IN NEW
JERSEY AND SOUTHEAST PENNSYLVANIA BACK TO WASHINGTON, DC.
ANY REMAINING HYDRO FORECASTS WILL BE ISSUED SHORTLY.
TJR
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000
AGUS71 KRHA 071340
HMDRHA
HYDROMETEOROLOGICAL DISCUSSION
MIDDLE ATLANTIC RIVER FORECAST CENTER
NATIONAL WEATHER SERVICE STATE COLLEGE PA
839 AM EST SUN FEB 07 2010
MORE SNOW FELL ACROSS PARTS OF THE MID ATLANTIC REGION OVER THE PAST
24 HOURS. THE HEAVIEST SNOW FELL FROM THE MARYLAND/PENNSYLVANIA
BORDER AND SOUTHERN NEW JERSEY SOUTHWARD INTO MARYLAND, EASTERN WEST
VIRGINIA, DELAWARE AND PARTS OF VIRGINIA. BASIN AVERAGE WATER
EQUIVALENTS RANGED FROM ONE TENTH /0.10/ UP TO FIVE TENTHS /0.50/ OF
AN INCH.
PRECIP (WATER
EQUIVALENT) COUNTY STATE LOCATION
0.67 Burlington NJ Mt. Holly WFO
0.60 Atlantic NJ Atlantic City
0.58 Baltimore MD Baltimore AP
0.50 Atlantic NJ Estelle Manor
0.50 Atlantic NJ Hammonton
0.50 Prince Georges MD Friendly 1N
0.50 Philadelphia PA Philadelphia 4.7NNE
0.45 Fairfax VA Dunn Loring
0.42 Caroline MD Greensboro 1.4ENE
0.41 Worcester MD Assateague
0.40 Morgan WV Cacapon State Park
0.40 Cape May NJ Woodbine 0.8NNW
0.40 Culpeper VA Remington
0.40 Frederick MD Thurmont
HIGH PRESSURE WILL DOMINATE THROUGH TUESDAY AND BRING MAINLY FAIR AND
DRY WEATHER TO OUR HYDROLOGIC SERVICE AREA. THE NEXT STORM SYSTEM
WILL LIFT OUT OF THE NORTHERN GULF COAST STATES TUESDAY INTO THE OHIO
VALLEY WHILE A SECONDARY LOW RAPIDLY DEVELOPS ALONG THE VIRGINIA
COAST. THIS NEXT STORM SYSTEM WILL BRING THE NEXT ROUND OF SNOW,
SLEET, FREEZING RAIN AND RAIN (CLOSER TO THE EAST COAST) TUESDAY
AFTERNOON THROUGH WEDNESDAY.
EXCEPT FOR A MINOR ADDITIONAL RISE ON THE LOWER APPOMATTOX, EXPECT
GENERALLY STEADY TO SLOWLY FALLING RIVER STAGES THROUGH TUESDAY. ALL
MARFC GUIDANCE WILL BE ISSUED BY 11AM.
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