WEATHER TREND: MUCH COLDER WITH SNOW SHOWERS THU ??? STAY TUNED: WE ARE MOVING ON MARCH 1ST 2014 !!!

THE NWS HAS ISSUED A HIGH WIND ADVISORY FOR THE BALTIMORE AREA ... THE HIGH WIND ADVISORY IS IN EFFECT FROM 1100 AM EST ON THURSDAY 12/23/10 THRU 600 PM EST ON THURSDAY 12/23/10

MODEL DIAGNOSTIC DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
1235 PM EST FRI DEC 24 2010

VALID DEC 24/1200 UTC THRU DEC 28/0000 UTC


...SEE NOUS42 KWNO ADMNFD FOR THE STATUS OF THE UPPER AIR
INGEST...

12Z NAM/GFS EVALUATION INCLUDING THE UKMET/CANADIAN AND
PREFERENCES

...SPLIT SHORTWAVE TROUGHS EXTENDING OVER THE PLAINS/MIDWEST...
...LOW PRESSURE FORMING ALONG THE EAST COAST THROUGH MONDAY...

PREFERENCE: EQUAL BLEND OF THE 06Z GFS/00Z ECMWF OR THE ENSEMBLE
MEANS

INITIALIZATION ERRORS IN NUMEROUS DIAGNOSTIC
QUANTITIES...INCLUDING HEIGHT/VORTICITY FIELDS/RH...ARE EVIDENT IN
BOTH THE 12Z NAM/GFS WITH SMALL BUT LIKELY SIGNIFICANT SHORTWAVE
TROUGHS OVER SOUTH DAKOTA/NEBRASKA ALONG WITH
SASKATCHEWAN/MANITOBA...WITH THESE AREAS ALSO NOT PARTICULARLY
RESOLVED OR PREDICTED WELL BY THE 00Z ECMWF. THUS...THE SPECIFIC
PREDICTIONS BY ALL DETERMINISTIC GUIDANCE ARE IN QUESTION...WITH
THE RECOMMENDATION TO FOLLOW CONTINUITY...WITH THE FINAL OUTCOME
MOST BELIEVED TO LIE BETWEEN THE 06Z GFS AND 00Z ECMWF...WITH ALL
ENSEMBLE GUIDANCE INCLUDING THE SREF MEAN/GEFS MEAN/ECMWF ENSEMBLE
MEAN ALSO CONSIDERED USEFUL TO ADDRESS THE CONTINUED UNCERTAINTY.
THIS APPROACH DISREGARDS THE SUBSTANTIALLY DEEPER AND WESTWARD
SHIFT OF THE 12Z GFS REGARDING THE POWERFUL LOW TRACKING UP THE
EASTERN SEABOARD...AND TO A LESSER EXTENT THE 12Z NAM WHICH LIES
NEAR THE FAST EDGE OF THE GUIDANCE WITH THE DEVELOPING LOW.

THE NEW UKMET/CANADIAN ARE DIFFICULT TO EVALUATE FOR
INITIALIZATION SINCE WE RECEIVE A LIMITED AMOUNT OF DATA.
HOWEVER...THEIR SOLUTIONS LIE WITHIN THE EASTERN HALF OF THE
GUIDANCE ONCE THE INDIVIDUAL TROUGHS PHASE TO PRODUCE THE
DEEPENING LOW OFFSHORE...WHICH HAS CONSISTENTLY BEEN THE CASE.
THUS...INITIAL RECOMMENDATIONS ARE PRESERVED WITH CONTINUITY MOST
PREFERRED.

...HIGH AMPLITUDE SHORTWAVE TROUGH ENTERING THE WEST SATURDAY
NIGHT/SUNDAY...

PREFERENCE: NAM OR 00Z ECMWF ACROSS CALIFORNIA AND THE SOUTHWEST

THE GFS HAS TRENDED SLOWER WITH SOUTHERN PORTIONS OF THE TROUGH
ENTERING CALIFORNIA AND THE SOUTHWEST SATURDAY NIGHT AND
SUNDAY...BUT IS STILL FASTER THAN THE AGREEING NAM/00Z
ECMWF...WHILE THE GFS IS ONLY SLIGHTLY FASTER WITH NORTHERN
PORTIONS OF THE TROUGH. GIVEN GFS TRENDS AND SUPPORT FROM THE NEW
UKMET/CANADIAN...THE PREFERENCE ACROSS THE SOUTHWEST IS FOR THE
NAM OR 00Z ECMWF.

...LOW PRESSURE NEARING THE PACIFIC NORTHWEST COAST LATE MONDAY...

PREFERENCE: 2/3 NAM OR 00Z ECMWF TO 1/3 GFS

THE NAM/00Z ECMWF ARE IN RELATIVELY GOOD AGREEMENT WITH A SURFACE
LOW AND ACCOMPANYING LEADING EDGE OF ITS FRONTAL SYSTEM
APPROACHING THE COAST JUST WEST OF PORTLAND BY 00Z TUE...WHILE THE
12Z GFS IS ABOUT 200 NM FARTHER SOUTH AT THE SAME TIME. WHILE
SOLUTION SPREAD IS QUITE LARGE AT THIS TIME FRAME...
RECOMMEND LEANING TOWARD THE MORE NORTHERN SOLUTION OF THE NAM/00Z
ECMWF.

...MODEL TREND GRAPHICS AT
WWW.HPC.NCEP.NOAA.GOV/HTML/MODEL2.SHTML...
...500MB FORECASTS AT WWW.HPC.NCEP.NOAA.GOV/H5PREF/H5PREF.SHTML...

JAMES

PROBABILISTIC HEAVY SNOW AND ICING DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
355 PM EST FRI DEC 24 2010

VALID 00Z SAT DEC 25 2010 - 00Z TUE DEC 28 2010

DAYS 1-3...

...OH VLY/APLCHNS...
AREA OF SNOWFALL IN THE MIDWEST WILL CONTINUE EWD THRU THE OH VLY
THIS EVENING/OVERNIGHT AHEAD OF A DIGGING/DEVELOPING ERN CONUS
TROF. PVA/MID LVL FRONTOGENESIS/HT FALLS COMBINED WITH A MODEST
PLUME OF MSTR WILL SUSTAIN LIGHT SNOW EVENT FROM IL/IN TO THE
APLCHNS. MODELS HAVE COME TO GREAT AGREEMENT HERE MASS
FIELD-WISE... ALTHO THE NAM IS WETTER THAN THE CONSENSUS. BASED
ON OBSERVED SNOWFALL... A GENERAL 2-3 INCHES WILL BE ANTICIPATED
IN THE PLAINS/VLYS... BUT MORE IN THE FOOTHILLS/APLCHNS WITH
UPSLOPE ENHANCEMENT. ONCE THE WAVE SLIDES EAST... ALL BUT THE
TRRN WILL SEE PRECIP END. NW FLOW BEHIND THE WAVE COMBINED WITH
FLOW FROM DEVELOPING COASTAL STORM WILL PROMOTE A LONG-LIVED
UPSLOPE EVENT TO HIR TRRN OF KY/WV... ALTHO THE OVERALL MSTR WILL
BE LIMITED... SO ONLY 3-6 ADDITIONAL INCHES FCST LCLY.

...LWR MID-ATLC...
PRECIP WILL SPREAD INTO THE REGION LATE CHRISTMAS DAY AHEAD OF THE
APPROACHING DYNAMIC TROF... WHILE THE SFC FTR DEVELOPS IN THE ERN
GULF AND CROSSES FL. TRANSITION TO WET SNOW MIX SHOULD OCCUR
OVERNIGHT THEN CHANGE TO ALL SNOW AS CAA TAKES OVER ONCE THE LOW
ACCELERATES NWD OFF THE COAST. QUESTION REMAINS HOW MUCH PRECIP
WILL BE LEFT TO FALL ONCE THE THERMALS BECOME SUPPORTIVE OF SNOW.
CONSENSUS IS EMERGING DISCOUNTING THE 12Z GFS AND 18Z NAM... THAT
TAKES THE LOW FARTHER OFFSHORE AND BRINGS PERHAPS 1-2 INCHES TO
ERN/CNTRL NC AND EXTREME SE VA.

...NEW ENGLAND...
HPC CHOSE TO DEFER TO CONTINUITY HERE AFTER SEEING SPREAD OF 12Z
GUIDANCE. REGARDING SFC LOW OFF THE COAST... 12Z GFS/18Z NAM AND
SEVERAL GFS ENSEMBLE MEMBERS JUMPED WEST WHILE REMAINING HELD
SERVE OR TRENDED EAST. H5 EVOLUTION IS NEARLY AS
DISPARATELY-HANDLED AS AT THE SFC... WITH THE GFS AGAIN WRAPPING
IT TIGHTER AND FARTHER WEST. THERE WILL BE PLENTY OF DYNAMIC
ENERGY AS THE TROF GOES NEG TILT SUNDAY... AND THE DEEP LOW
OFFSHORE WILL PROMOTE A BURST OF HVY SNOWFALL TO PORTION OF NEW
ENG IN THE THE PREFERRED SCENARIO. STILL THINK CAPE COD AND NRN
COAST ME WILL SEE HEAVIEST AMTS WITH TIGHT ACCUM GRADIENT INLAND.
BLEND INCORPORATED 06Z GFS/00Z ECMWF REFLECTING PREFERENCE LOW
TRACK. STILL LOW CONFIDENCE HERE.

...WEST...
DEEP TROUGH IN THE ERN GULF OF ALASKA ROTATES A SIGNIFICANT
SHORTWAVE INLAND ALONG THE WEST COAST FROM NRN CALIF TO THE
CANADIAN BORDER ON SATURDAY/SUNDAY. WITH THE DEEP ONSHORE FLOW
DIRECTED PRIMARILY AT THE CASCADES AND SISKIYOUS...THE SYSTEM
SPLITS WITH SNOW LEVELS IN THE CASCADES FALLING TO 3000-4000FT MSL
AND SATURDAY AFTERNOON/EVENING THROUGH SUNDAY MORNING...THE SIERRA
AND WINDWARD FOOTHILLS RECEIVE ANOTHER ROUND OF MODERATE TO HEAVY
SNOWFALL AS CRITICAL TEMPERATURES FALL TO ELEVATIONS IN THE
5000-6000FT MSL RANGE. USED A BLEND OF THE EC/NAM/GFS THERMAL
PROFILES AND HPC QPFS ALONG THE WEST COAST...TO GENERATE THE
SIGNIFICANT SNOWFALL GRAPHICS.

THE PROBABILITY OF SIGNIFICANT ICING IS LESS THAN 10 PERCENT.


SOWKO

DEZ001-002-MDZ008-012-015-019-020-NJZ008>010-015>019-021-PAZ067>071-
260230-
NEW CASTLE-KENT-CECIL-KENT MD-QUEEN ANNES-TALBOT-CAROLINE-MORRIS-
HUNTERDON-SOMERSET-MERCER-SALEM-GLOUCESTER-CAMDEN-
NORTHWESTERN BURLINGTON-CUMBERLAND-CHESTER-MONTGOMERY-BUCKS-DELAWARE-
PHILADELPHIA-
926 PM EST FRI DEC 24 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL DELAWARE...NORTHERN
DELAWARE...NORTHEAST MARYLAND...CENTRAL NEW JERSEY...NORTHERN NEW
JERSEY...NORTHWEST NEW JERSEY...SOUTHERN NEW JERSEY AND SOUTHEAST
PENNSYLVANIA.

.DAY ONE...TONIGHT.

HAZARDOUS WEATHER IS NOT EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY.

A COASTAL STORM MAY AFFECT OUR REGION DURING THE SUNDAY INTO
MONDAY TIME FRAME, ALTHOUGH THE THREAT IS NOT HIGH AT THIS TIME.
THERE STILL REMAINS SOME UNCERTAINTY REGARDING THE TIMING AND
TRACK, BUT THE GREATEST THREAT STILL WOULD BE TO EASTERN SECTIONS.

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
309 AM EST SAT DEC 25 2010
DCZ001-MDZ006-007-009>011-013-014-016>018-VAZ052>057-251615-
/O.NEW.KLWX.WS.A.0010.101226T1100Z-101227T1100Z/
DISTRICT OF COLUMBIA-NORTHERN BALTIMORE-HARFORD-MONTGOMERY-HOWARD-
SOUTHERN BALTIMORE-PRINCE GEORGES-ANNE ARUNDEL-CHARLES-ST. MARYS-
CALVERT-PRINCE WILLIAM/MANASSAS/MANASSAS PARK-FAIRFAX-
ARLINGTON/FALLS CHURCH/ALEXANDRIA-STAFFORD-SPOTSYLVANIA-
KING GEORGE-
INCLUDING THE CITIES OF...WASHINGTON...GAITHERSBURG...COLUMBIA...
BALTIMORE...ANNAPOLIS...WALDORF...ST MARYS CITY...MANASSAS...
MANASSAS PARK...FAIRFAX...ALEXANDRIA...FALLS CHURCH...
FREDERICKSBURG
309 AM EST SAT DEC 25 2010
...WINTER STORM WATCH IN EFFECT FROM SUNDAY MORNING THROUGH LATE
SUNDAY NIGHT...

THE NATIONAL WEATHER SERVICE IN BALTIMORE MD/WASHINGTON HAS
ISSUED A WINTER STORM WATCH...WHICH IS IN EFFECT FROM SUNDAY
MORNING THROUGH LATE SUNDAY NIGHT.


* PRECIPITATION TYPE...SNOW.

* ACCUMULATIONS...POSSIBILITY OF 5 OR MORE INCHES.

* TIMING...SPREADING IN SUNDAY MORNING FROM SOUTH TO NORTH. ENDING
LATE SUNDAY NIGHT OR EARLY MONDAY MORNING. THE PEAK PERIOD OF
SNOWFALL WILL BE SUNDAY AFTERNOON AND EVENING.

* TEMPERATURES...HIGH TEMPERATURES IN THE LOWER 30S SUNDAY AND
MONDAY. LOW TEMPERATURES SUNDAY NIGHT IN THE LOWER TO MID 20S.

* WINDS...NORTH 10 TO 15 MPH SUNDAY MORNING...INCREASING TO 15 TO
25 LATE SUNDAY AFTERNOON. NORTHWEST 15 TO 25 MPH WITH GUSTS UP
TO 30 MPH SUNDAY NIGHT.



PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER STORM WATCH MEANS THERE IS A POTENTIAL FOR SIGNIFICANT
SNOW ACCUMULATIONS THAT MAY IMPACT TRAVEL. CONTINUE TO MONITOR
THE LATEST FORECASTS.

&&

WINTER STORM WARNING
in effect until Monday, Dec 27, 6:00 AM

...WINTER STORM WARNING IN EFFECT FROM 6 AM SUNDAY TO 6 AM EST MONDAY...

THE NATIONAL WEATHER SERVICE IN BALTIMORE MD/WASHINGTON HAS ISSUED A WINTER STORM WARNING FOR SNOW...WHICH IS IN EFFECT FROM 6 AM SUNDAY TO 6 AM EST MONDAY. THE WINTER STORM WATCH IS NO LONGER IN EFFECT.

* PRECIPITATION TYPE...SNOW.

* ACCUMULATIONS...6 TO 10 INCHES.

* TIMING...LIGHT SNOW WILL BEGIN AROUND DAYBREAK SUNDAY...THEN BECOME STEADIER AND HEAVIER TOWARDS MID MORNING. SNOW WILL CONTINUE HEAVY AT TIMES THROUGH THE EARLY EVENING HOURS SUNDAY...BEFORE TAPERING TO SNOW SHOWERS LATE SUNDAY NIGHT INTO EARLY MONDAY MORNING.

* TEMPERATURES...LOWS IN THE UPPER 20S LATE TONIGHT. HIGH TEMPERATURES IN THE LOWER 30S SUNDAY AND MONDAY. LOW TEMPERATURES SUNDAY NIGHT IN THE LOWER TO MID 20S.

* WINDS...NORTH 10 TO 15 MPH LATE TONIGHT AND SUNDAY MORNING... INCREASING TO 15 TO 25 MPH WITH GUSTS TO 35 MPH SUNDAY AFTERNOON. NORTHWEST 20 TO 30 MPH WITH GUSTS TO 40 MPH SUNDAY NIGHT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
631 PM EST SAT DEC 25 2010
DCZ001-MDZ006-007-011-013-014-VAZ054-260745-
/O.EXT.KLWX.WS.W.0013.101226T0900Z-101227T1100Z/
DISTRICT OF COLUMBIA-NORTHERN BALTIMORE-HARFORD-
SOUTHERN BALTIMORE-PRINCE GEORGES-ANNE ARUNDEL-
ARLINGTON/FALLS CHURCH/ALEXANDRIA-
INCLUDING THE CITIES OF...WASHINGTON...BALTIMORE...ANNAPOLIS...
ALEXANDRIA...FALLS CHURCH
631 PM EST SAT DEC 25 2010
...WINTER STORM WARNING NOW IN EFFECT FROM 4 AM SUNDAY TO 6 AM
EST MONDAY...

THE WINTER STORM WARNING IS NOW IN EFFECT FROM 4 AM SUNDAY TO
6 AM EST MONDAY.

* PRECIPITATION TYPE...SNOW.

* ACCUMULATIONS...6 TO 10 INCHES.

* TIMING...LIGHT SNOW WILL BEGIN FROM SOUTH TO NORTH DURING THE
EARLY MORNING HOURS SUNDAY...THEN BECOME STEADIER AND HEAVIER
TOWARDS MID MORNING. SNOW WILL CONTINUE HEAVY AT TIMES THROUGH
THE EARLY EVENING HOURS SUNDAY...BEFORE TAPERING TO SNOW SHOWERS
LATE SUNDAY NIGHT INTO EARLY MONDAY MORNING.

* TEMPERATURES...LOWS IN THE UPPER 20S LATE TONIGHT. HIGH
TEMPERATURES IN THE LOWER 30S SUNDAY AND MONDAY. LOW
TEMPERATURES SUNDAY NIGHT IN THE LOWER TO MID 20S.

* WINDS...NORTH 10 TO 15 MPH LATE TONIGHT AND SUNDAY MORNING...
INCREASING TO 15 TO 25 MPH WITH GUSTS TO 35 MPH SUNDAY
AFTERNOON. NORTHWEST 20 TO 30 MPH WITH GUSTS TO 40 MPH SUNDAY
NIGHT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Issued by The National Weather Service
Baltimore/Washington, MD
2:49 am EST, Sun., Dec. 26, 2010

... WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 AM EST MONDAY...

A WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 AM EST MONDAY.

* PRECIPITATION TYPE... SNOW.

* ACCUMULATIONS... 5 TO 8 INCHES.

* TIMING... LIGHT SNOW WILL BEGIN FROM SOUTH TO NORTH THIS MORNING... THEN BECOME STEADIER AND HEAVIER BY NOON. SNOW WILL CONTINUE HEAVY AT TIMES THROUGH THE EARLY EVENING HOURS... BEFORE TAPERING TO SNOW SHOWERS LATE TONIGHT INTO EARLY MONDAY MORNING.

* TEMPERATURES... UPPER 20S THIS MORNING. HIGH TEMPERATURES IN THE LOWER 30S TODAY AND MONDAY. LOW TEMPERATURES TONIGHT IN THE LOWER TO MID 20S.

* WINDS... NORTH 15 TO 20 MPH THIS MORNING... INCREASING TO 20 TO 25 MPH WITH GUSTS TO 35 MPH THIS AFTERNOON. NORTHWEST 25 TO 30 MPH WITH GUSTS TO 40 MPH TONIGHT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1043 AM EST SUN DEC 26 2010
MDZ006-007-011-014-262345-
/O.CAN.KLWX.WS.W.0013.000000T0000Z-101227T1100Z/
/O.EXA.KLWX.WW.Y.0026.000000T0000Z-101227T1100Z/
NORTHERN BALTIMORE-HARFORD-SOUTHERN BALTIMORE-ANNE ARUNDEL-
INCLUDING THE CITIES OF...BALTIMORE...ANNAPOLIS
1043 AM EST SUN DEC 26 2010
...WINTER WEATHER ADVISORY IN EFFECT UNTIL 6 AM EST MONDAY...
...WINTER STORM WARNING IS CANCELLED...

THE NATIONAL WEATHER SERVICE IN BALTIMORE MD/WASHINGTON HAS
ISSUED A WINTER WEATHER ADVISORY FOR SNOW... WHICH IS IN EFFECT
UNTIL 6 AM EST MONDAY. THE WINTER STORM WARNING HAS BEEN
CANCELLED.

* PRECIPITATION TYPE...SNOW.

* ACCUMULATIONS...2 TO 4 INCHES.

* TIMING...LIGHT SNOW WILL OVERSPREAD THE AREA THROUGH NOON...AND
CONTINUE DURING THE AFTERNOON AND EVENING HOURS.

* TEMPERATURES...AROUND 30 TODAY...FALLING TO THE LOWER TO MID
20S TONIGHT.

* WINDS...NORTH 10 TO 15 MPH THIS MORNING...INCREASING TO 15 TO
25 MPH WITH GUSTS TO 35 MPH THIS AFTERNOON. NORTHWEST 20 TO 30
MPH WITH GUSTS TO 40 MPH TONIGHT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER WEATHER ADVISORY MEANS THAT PERIODS OF SNOW WILL CAUSE
TRAVEL DIFFICULTIES. BE PREPARED FOR SLIPPERY ROADS AND LIMITED
VISIBILITIES...AND USE CAUTION WHILE DRIVING.

&&

MESOSCALE DISCUSSION 2137
NWS STORM PREDICTION CENTER NORMAN OK
1131 AM CST SUN DEC 26 2010

AREAS AFFECTED...MID ATLANTIC COAST INTO SRN AND CNTRL PARTS OF NEW
ENGLAND

CONCERNING...HEAVY SNOW

VALID 261731Z - 262330Z

BANDS OF HEAVY SNOW WITH HOURLY RATES APPROACHING 1 TO 2 INCHES ARE
EXPECTED TO DEVELOP NWD/NWWD FROM PORTIONS OF DE/NJ THROUGH THE NYC
METROPOLITAN AREA INTO SRN AND CNTRL PARTS OF NEW ENGLAND BY THIS
EVENING. IN ADDITION TO THE RAPIDLY ACCUMULATING SNOW...
STRENGTHENING NELY WINDS WILL RESULT IN BLIZZARD CONDITIONS BY LATE
AFTERNOON INTO TONIGHT.

17Z MESOANALYSIS INDICATES A DEEPENING LOW OFF THE NC OUTER BANKS
WHICH LATEST NUMERICAL GUIDANCE INDICATES WILL UNDERGO CONSIDERABLE
DEEPENING WHILE DEVELOPING NWD TO OFF THE COAST OF NJ BY 27/00Z.
THE RAPID CYCLOGENESIS CAN BE ATTRIBUTED TO THE NNEWD TRANSLATION OF
AN INTENSE MID TO UPPER-LEVEL PV ANOMALY ALONG THE MID ATLANTIC
COAST. THE RESULTING ENHANCEMENT OF OCEANIC HEAT/MOISTURE FLUXES
WILL SUPPORT THE CONTINUED INTENSIFICATION OF LOW- TO
MID-TROPOSPHERIC BAROCLINIC ZONE WHICH WILL PIVOT NWWD THROUGH SRN
ENGLAND BY THIS EVENING...IN ADVANCE OF SURFACE LOW.

SUBSEQUENT INTENSIFICATION OF ONE OR MULTIPLE HEAVY SNOW BANDS /VIA
MESOSCALE CIRCULATIONS TIED TO FRONTOGENETIC FORCING/ IS EXPECTED
THROUGH THE REMAINDER OF THE AFTERNOON...WITH RATES POTENTIALLY
BEING AUGMENTED BY SLANTWISE OR UPRIGHT CONVECTIVE DEVELOPMENT.
WHEN COUPLED WITH STRENGTHENING GRADIENT FLOW ASSOCIATED WITH THE
CYCLOGENESIS...EXPECT BLIZZARD CONDITIONS TO DEVELOP BY LATE
AFTERNOON INTO TONIGHT FROM PARTS OF NJ NWD THROUGH NYC INTO SRN NEW
ENGLAND. THE EXCEPTION MAY BE OVER SERN MA WHERE BOUNDARY LAYER MAY
REMAIN SUFFICIENTLY WARM TO SUPPORT A MIX OF RAIN AND SNOW OR ALL
RAIN.

..MEAD.. 12/26/2010


ATTN...WFO...GYX...BOX...OKX...ALY...PHI...BGM...AKQ...

LAT...LON 38807407 38477468 38427541 39147574 40507513 41877427
42887303 42967133 42787030 42286914 42086903 41597020
41437119 40677263 39527378 38807407

WINTER WEATHER ADVISORY
in effect until Monday, Dec 27, 6:00 AM

...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 AM EST MONDAY...

A WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 6 AM EST MONDAY.

* PRECIPITATION TYPE...SNOW.

* ACCUMULATIONS...1 TO 2 INCHES.

* TIMING...LIGHT SNOW WILL FALL OVER THE AREA THIS EVENING AND THEN TAPER OFF BETWEEN 11 PM AND 3 AM.

* TEMPERATURES...FALLING INTO THE LOWER TO MID 20S TONIGHT.

* WINDS...NORTH 15 TO 25 MPH WITH GUSTS TO 35 MPH THIS AFTERNOON AND EVENING. NORTHWEST 20 TO 30 MPH WITH GUSTS TO 40 MPH OVERNIGHT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER WEATHER ADVISORY MEANS THAT PERIODS OF SNOW WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR SLIPPERY ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE DRIVING.

&&

NOUS41 KLWX 270049
PNSLWX
DCZ001-MDZ003>007-009>011-013-014-016>018-501-502-VAZ021-025>031-
036>042-050>057-WVZ049>055-501>504-271249-

PUBLIC INFORMATION STATEMENT
SPOTTER REPORTS
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
749 PM EST SUN DEC 26 2010

THE FOLLOWING ARE UNOFFICIAL OBSERVATIONS TAKEN DURING THE PAST
8 HOURS FOR THE STORM THAT HAS BEEN AFFECTING OUR REGION.
APPRECIATION IS EXTENDED TO HIGHWAY DEPARTMENTS...COOPERATIVE
OBSERVERS...SKYWARN SPOTTERS AND MEDIA FOR THESE REPORTS. THIS
SUMMARY IS ALSO AVAILABLE ON OUR HOME PAGE AT WEATHER.GOV/BALTIMORE

********************STORM TOTAL SNOWFALL********************

LOCATION STORM TOTAL TIME/DATE COMMENTS
SNOWFALL OF
/INCHES/ MEASUREMENT

MARYLAND

...BALTIMORE COUNTY...
WOODMONT 0.8 530 PM 12/26

...CALVERT COUNTY...
TANGLEWOOD 2.5 1230 PM 12/26
KINGS LANDING 2.0 534 PM 12/26

...CHARLES COUNTY...
COBB ISLAND 3.0 415 PM 12/26
COOKSEY KNOLLS 2.0 718 PM 12/26
FREEDOM VILLAGE 1.0 631 PM 12/26

...HOWARD COUNTY...
ROBINSONS PROMISE 0.5 700 PM 12/26

...ST. MARYS COUNTY...
PORTNEYS OVERLOOK 5.0 416 PM 12/26
1 NW RIDGE 4.9 441 PM 12/26
MECHANICSVILLE 4.0 711 PM 12/26
WILDEWOOD 3.8 626 PM 12/26
1 N FENWICK MANOR 3.5 530 PM 12/26

VIRGINIA

...ARLINGTON COUNTY...
BALLSTON 0.2 719 PM 12/26

...CITY OF ALEXANDRIA...
DEL RAY 0.2 510 PM 12/26

...CITY OF WAYNESBORO...
2 W WAYNESBORO 0.9 430 PM 12/26

$$

WOODY!

THE NWS HAS NOW ISSUED A HIGH WIND ADVISORY FOR THE BALTIMORE AREA EFFECTIVE UNTIL 900 PM EST ON MONDAY 12/27/10 (ISSUED AS OF 1000 PM EST ON SUNDAY 12/26/10)