Blizzard Warning
Posted by JAC on 12/19/2009, 10:34 am


Blizzard Warning

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
908 AM EST SAT DEC 19 2009

DCZ001-MDZ006-007-009>011-VAZ052>057-192215-
/O.EXA.KLWX.BZ.W.0001.000000T0000Z-091219T2300Z/
/O.EXT.KLWX.WS.W.0008.000000T0000Z-091220T1100Z/
DISTRICT OF COLUMBIA-NORTHERN BALTIMORE-HARFORD-MONTGOMERY-HOWARD-
SOUTHERN BALTIMORE-PRINCE WILLIAM/MANASSAS/MANASSAS PARK-FAIRFAX-
ARLINGTON/FALLS CHURCH/ALEXANDRIA-STAFFORD-SPOTSYLVANIA-
KING GEORGE-
INCLUDING THE CITIES OF...WASHINGTON...GAITHERSBURG...COLUMBIA...
BALTIMORE...MANASSAS...MANASSAS PARK...FAIRFAX...ALEXANDRIA...
FALLS CHURCH...FREDERICKSBURG
908 AM EST SAT DEC 19 2009

...BLIZZARD WARNING IN EFFECT UNTIL 6 PM EST THIS EVENING...
...WINTER STORM WARNING NOW IN EFFECT FROM 6 PM THIS EVENING TO
6 AM EST SUNDAY...

THE NATIONAL WEATHER SERVICE IN STERLING VIRGINIA HAS ISSUED A
BLIZZARD WARNING...WHICH IS IN EFFECT UNTIL 6 PM EST THIS
EVENING. THE WINTER STORM WARNING IS NOW IN EFFECT FROM 6 PM THIS
EVENING TO 6 AM EST SUNDAY.

* PRECIPITATION TYPE...SNOW.

* ACCUMULATIONS...HEAVY SNOW WITH ACCUMULATIONS OF 12 TO 22
 INCHES THROUGH TONIGHT.

* TIMING...SNOW WILL CONTINUE THROUGH EARLY SUNDAY MORNING. SNOW
 WILL BE HEAVIEST BETWEEN 8 AM AND 6 PM TODAY.

* TEMPERATURES...UPPER 20S TO LOWER 30S THROUGH THE EVENT...LOW
 TO MID 30S IN COASTAL SOUTHERN MARYLAND.

* WINDS...15 TO 25 MPH...WITH GUSTS UP TO 40 MPH DURING THE DAY
 TODAY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A BLIZZARD WARNING MEANS SEVERE WINTER WEATHER CONDITIONS ARE
EXPECTED OR OCCURRING. FALLING AND BLOWING SNOW WITH STRONG WINDS
AND POOR VISIBILITIES ARE LIKELY. THIS WILL LEAD TO WHITEOUT
CONDITIONS...MAKING TRAVEL EXTREMELY DANGEROUS. DO NOT TRAVEL. IF
YOU MUST TRAVEL...HAVE A WINTER SURVIVAL KIT WITH YOU. IF YOU GET
STRANDED...STAY WITH YOUR VEHICLE.

A WINTER STORM WARNING MEANS SIGNIFICANT AMOUNTS OF SNOW...
SLEET...AND ICE ARE EXPECTED OR OCCURRING. STRONG WINDS ARE ALSO
POSSIBLE.  THIS WILL MAKE TRAVEL VERY HAZARDOUS OR IMPOSSIBLE.

&&

$$








MESOSCALE DISCUSSION 2260
  NWS STORM PREDICTION CENTER NORMAN OK
  0557 AM CST SAT DEC 19 2009
 
  AREAS AFFECTED...ERN WV...NRN VA...MD...DE...SERN PA...NJ
 
  CONCERNING...HEAVY SNOW
 
  VALID 191157Z - 191800Z
 
  BANDS OF HEAVY SNOW WITH RATES OF 1-2 IN/HR WILL PERSIST MAINLY FROM
  ERN WV ACROSS NRN VA AND MD...DE...SERN PA AND SRN NJ. THE LONGEST
  DURATION OF HEAVY SNOW RATES IS LIKELY TO BE OVER ERN WV...NRN
  VA...AND MUCH OF MD.
 
  A LARGE SHIELD OF SNOW CURRENTLY EXTENDS FROM NEAR THE UPPER LOW
  CENTER OVER WV EWD N OF A DEEPENING SURFACE LOW. WARM ADVECTION
  COUPLED WITH DEEP LAYER FRONTOGENESIS IS RESULTING IN PERSISTENT AND
  MULTIPLE W-E BANDS OF HEAVY SNOW. DUE TO THE SLOW MOVEMENT OF THE
  TROUGH...LONG DURATIONS OF HEAVY SNOW WILL OCCUR. THROUGH
  18Z...EXPECT A SLIGHT PIVOT OF THE SNOW BANDS TO A WSW-ENE
  ORIENTATION AS THE LOW LEVEL WINDS BACK A BIT. BROAD...PERSISTENT
  FRONTOGENESIS SHOULD RESULT IN FURTHER CONSOLIDATION OF THE SNOW
  BANDS OVER THE MCD AREA.
 
  AS THE UPPER LOW PIVOTS EWD...COOLING ALOFT MAINLY ABOVE 650 MB WILL
  RESULT IN A DEEPER DENDRITIC GROWTH LAYER YIELDING A MORE
  TEMPERATURE PROFILE FOR PARTICULARLY HEAVY SNOW FROM 12-18Z ACROSS
  ERN WV...NRN VA...AND CNTRL MD. SNOW RATES COULD INCREASE TO MORE
  THAN 2 IN/HR AT TIMES.
 
  ..JEWELL.. 12/19/2009
 
 
  ...NOTICE...
  SPC WINTER WEATHER MESOSCALE DISCUSSIONS WILL BE ISSUED ON A
  SCHEDULED BASIS FROM DECEMBER 1 THROUGH FEBRUARY 28...FOUR
  TIMES A DAY...AROUND 00 UTC...06 UTC...12 UTC...AND 18 UTC
  FOR SIGNIFICANT SHORT RANGE WINTER WEATHER EVENTS.
 
  ATTN...WFO...OKX...PHI...AKQ...CTP...LWX...RNK...PBZ...RLX...
 
  LAT...LON   37787819 37668022 38068133 39008107 39627971 40377822
              40597660 40617420 39997393 38987476 38347589 37787819
 
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Traffic Info Site & Watches / Warnings - JAC, 12/18/2009, 4:01 pm
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