CaneTalk: 700mb Low Phasing - Stationary Heavy Snow

700mb Low Phasing - Stationary Heavy Snow

Posted by JAC on 2/6/2010, 8:55 am

A BLIZZARD WARNING REMAINS IN EFFECT UNTIL 10 PM TONIGHT FOR THE
DISTRICT OF COLUMBIA...ANNE ARUNDEL...BALTIMORE...HARFORD...
CALVERT...CHARLES...PRINCE GEORGES AND ST. MARYS COUNTIES. PLEASE
REFER TO THE LATEST WINTER WEATHER MESSAGE /WSWLWX/ FOR FURTHER
DETAILS.

MESOSCALE DISCUSSION 0108
NWS STORM PREDICTION CENTER NORMAN OK
0553 AM CST SAT FEB 06 2010

AREAS AFFECTED...NRN VA/DC/MD/DE/SRN NJ

CONCERNING...HEAVY SNOW

VALID 061153Z - 061600Z

VERY HEAVY SNOW WILL PERSIST ALONG AN AXIS FROM NRN VA...EWD ACROSS
DC/CNTRL MD AND DE/SRN NJ FOR THE NEXT SEVERAL HOURS. SNOWFALL
RATES ARE EXPECTED TO RANGE FROM 1-3"/HR.

LATEST SATELLITE AND RADAR IMAGERY STRONGLY SUGGEST MID LEVEL
CIRCULATION IS REDEVELOPING OVER SRN MD INVOF WORCESTER COUNTY WHICH
IS FORCING ATTENDANT SFC LOW TO DEEPEN OFF THE VA/NC COAST. A NEAR
STATIONARY BAND OF VERY HEAVY SNOW...WITH RATES OF
2-3"/HR...CONTINUES FROM JUST NW OF DC...ENEWD TO JUST SOUTH OF BAL
INTO CNTRL DE. LATEST MODEL GUIDANCE SUGGESTS LIGHTNING MAY BE
NOTED AT TIMES AS WEAK UPRIGHT INSTABILITY IS FORECAST FOR PARCELS
LIFTED NEAR 700MB. THIS BAND WILL GRADUALLY SAG SWD OVER THE NEXT
FEW HOURS AS LOW PRESSURE SYSTEM DEEPENS OFFSHORE AND INLAND LOW
WEAKENS AND SHEARS EAST ACROSS VA. SURROUNDING THIS VERY HEAVY BAND
OF SNOW IS A RATHER BROAD REGION OF HEAVY SNOW WITH RATES LIKELY
EXCEEDING 1"/HR IN PLACES FROM WV...NEWD ACROSS SRN PA INTO NJ.

..DARROW.. 02/06/2010