National Weather Service Recent Cyclone Sandy Information

NWS - National Mosaic Enhanced Radar Image of Sandy and Upper Peninsula of Michigan

NWS – National Mosaic Enhanced Radar Image of Sandy and Upper Peninsula of Michigan


.SYNOPSIS…
POST TROPICAL CYCLONE SANDY WILL MERGE WITH THE CANADIAN LOW
PRESSURE SYSTEM OVER THE NORTHEAST TODAY. THE LARGE STORM SYSTEM
WILL CONTINUE TO AFFECT THE MID ATLANTIC REGION TODAY INTO
WEDNESDAY. COOL TEMPERATURES WILL CONTINUE THROUGH THE END OF THE
WEEK.

&&

.NEAR TERM /UNTIL 6 PM THIS EVENING/…
POST TROPICAL SANDY HAS BEGUN TO MERGE WITH THE CANADIAN LOW
PRESSURE SYSTEM ACROSS THE MID ATLANTIC/NORTHEAST. AT THE SFC…THE
SFC LOW IS LOCATED OVER THE BORDERS OF DE/MD/PA/NJ. LIGHT RAIN WILL
CONTINUE ACROSS THE FA THIS MORNING AS ABUNDANT MOISTURE REMAINS IN
PLACE. BY 10Z…BUFR SOUNDINGS ACROSS THE PIEDMONT SHOW MUCH OF THE
COLUMN BELOW 0C…WITH ONLY THE LOWEST THOUSAND FT ABOVE FREEZING.
ADD IN WEAK FRONTOGENETIC FORCING AND -10C MOISTURE AND OMEGA AND
THERE WILL BE THE POSSIBILITY OF SEEING SNOW MIX IN WITH LIGHT RAIN.
THE BEST CHANCES TO SEE SNOW WILL BE RICHMOND WWD BETWEEN 6AM AND
9AM. AS THE SUN COMES UP…PRECIP WILL TRANSITION BACK TO LIGHT
RAIN. NO ACCUMULATION IS EXPECTED. SW WINDS WILL CONTINUE THIS
MORNING WITH POSSIBLE GUSTS UP TO 25 TO 30 MPH INLAND AND UP TO 40
MPH NEAR THE COAST.

DRY AIR WILL BEGIN TO INVADE THE LOW LEVELS THIS AFTERNOON…MOSTLY
ACROSS SE VA/NE NC…BRINGING AN END TO SHOWERS THIS AFTERNOON.
ELSEWHERE…ENOUGH FORCING/ENERGY EXISTS FOR CONTINUED
LIGHT/MODERATE SHOWERS. THE BEST CHANCES OF PRECIP WILL BE ACROSS
THE PIEDMONT INTO NORTHERN PORTIONS OF THE FA AND THE MD EASTERN
SHORE. HAVE CANCELLED THE FLOOD WATCH AS ADDITIONAL QPF AMOUNTS
WILL BE LESS THAN HALF AN INCH. AS THE LOW MOVES WEST INTO WRN PA
TODAY…THE PRESSURE GRADIENT WILL RELAX ALLOWING WINDS TO WEAKEN
TODAY. LAPSE RATES WILL ALSO NOT BE AS STEEP TODAY THANKS TO CAA.
THE EXCEPTION WILL BE ACROSS THE MD EASTERN SHORE AS STRONG WINDS
WILL CONTINUE TO BE POSSIBLE…ESPECIALLY NEAR THE COASTS. LOWERING
HEIGHTS/THICKNESS VALUES AS WELL AS ABUNDANT LOW LEVEL CLOUD COVER
AND WEAK MIXING WILL ONLY ALLOW FOR A FEW DEGS OF WARMING TODAY.
HIGHS WILL ONLY REACH INTO THE MID/UPPER 40S ACROSS THE REGION WITH
AROUND 50 NEAR THE COASTS.

&&

.SHORT TERM /6 PM THIS EVENING THROUGH THURSDAY/…
A HIGHLY MERIDIONAL BLOCKING PATTERN WILL CONTINUE THROUGH THE
MIDDLE OF THE WEEK AND WILL BE CHARACTERIZED BY A LONGWAVE TROUGH
OVER THE EASTERN U.S. AND RIDGING OVER THE WEST. MEANWHILE…THE
STORM SYSTEM IS PROGGED TO BE NEAR THE PA/NY BORDER WEDNESDAY
MORNING AND IS FORECAST TO STEADILY FILL AS IT LIFTS N TOWARD THE
GREAT LAKES. THE STRONG LOW WILL CONTINUE TO STRONGLY IMPACT THE
WEATHER OVER THE LOCAL AREA WEDNESDAY. WEAK SFC TROUGHING ACROSS THE
AREA AND MID LEVEL DISTURBANCES WRAPPING AROUND THE UPPER LOW WILL
RESULT IN A MENTION OF SLIGHT CHANCE POPS ACROSS THE NORTHERN FA
ZONES…INCLUDING THE MD EASTERN SHORE REGION. ELSEWHERE…DRY NWLY
FLOW WILL LIMIT PRECIP CHANCES AND HELP WITH BREAKING UP CLOUD
COVER. HIGH TEMPERATURES WEDNESDAY SHOULD BE AROUND -1 TO -1.5 ST
DEV BELOW SEASONAL AVERAGES (MID 50S). LOW TEMPERATURES SHOULD
LARGELY BE IN THE MID TO UPPER 30S INLAND…TO LOW TO MID 40S ALONG
THE COASTLINES AND IN URBAN AREAS.

&&

.LONG TERM /THURSDAY NIGHT THROUGH MONDAY/…
AN H5 TROUGH REMAINS OVER THE EASTERN SEABOARD THURS NIGHT THRU
FRIDAY NIGHT WITH HIGH PRESSURE AT THE SFC STARTING TO BUILD BACK
OVER THE REGION. THE H5 TROUGH MOVES OFFSHORE BY SATURDAY.
MEANWHILE…AN H5 RIDGE TRANSLATES EASTWARD THROUGH SUNDAY WITH SFC
HIGH PRESSURE BUILDING OVERHEAD. THIS SETUP WILL LEAD TO DRY WX
THROUGH NEXT WEEKEND. THE NEXT STORM SYSTEM MAY IMPACT THE REGION BY
MONDAY OF NEXT WEEK. HIGHS WILL GENERALLY REMAIN IN THE 50S FRIDAY
THROUGH MONDAY. LOWS WILL BE IN THE 30S TO LOW 40S.

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