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Feb 5-6 2010 - Snowmageddon


Ian
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AFD from Thursday afternoon (don't think it's been posted)

000

FXUS61 KLWX 042006

AFDLWX

AREA FORECAST DISCUSSION

NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC

306 PM EST THU FEB 4 2010

.SYNOPSIS...

-- Changed Discussion --HIGH PRESSURE WILL MOVE AWAY FROM THE AREA TONIGHT. A STRONG WINTER

STORM IS EXPECTED TO IMPACT THE REGION FRIDAY INTO SATURDAY. HIGH

PRESSURE MAY RETURN BY MONDAY...BUT ANOTHER STORM WILL AFFECT THE

REGION TUESDAY.-- End Changed Discussion --

&&

.NEAR TERM /UNTIL 6 AM FRIDAY MORNING/...

-- Changed Discussion --DENSE OVERHEAD CIRRUS IS A SIGN OF THE INCOMING LOW PRESSURE

SYSTEM AND PRECURSOR TO WINTRY END TO THE WEEK ACROSS THE MID-

ATLANTIC. TEMPS THIS AFTN HAVE RISEN INTO THE U30S AND L40S...

ALLOWING FOR SOME MELTING OF THE SNOW ACROSS THE REGION.

DEWPOINTS HAVE NOT DROPPED VERY MUCH AND WILL REMAIN FAIRLY STEADY

OVERNIGHT INTO EARLY FRIDAY. THIS WILL MODIFY TEMPS OVERNIGHT A

BIT...KEEPING LOWS IN THE M-U20S BUT ALSO KEEPING SFC TEMPS STEADY

INTO THE MORNING HRS JUST AHEAD OF THE STORM SYSTEM.-- End Changed Discussion --

&&

.SHORT TERM /6 AM FRIDAY MORNING THROUGH SATURDAY NIGHT/...

-- Changed Discussion --MID-LVL CONFLUENCE ACRS NEW ENGLAND SHUD SUSTAIN LOW-LVL HIPRES

AND ASSOCIATED COLD AIR IN PLACE FOR MID-ATLC RGN. COMPACT BUT

STRONG SHRTWV TROF WILL MOVE ACRS MS RVR VLY FRI...WITH DEEP MSTR

SPREADING NEWD ON SWLY FLOW.

SFC LOPRES ASSOCIATED WITH THE SHRTWV TROF WILL MOVE ACRS AL AND

GA BFR EMERGING INTO THE ATLC NEAR THE NC/SC BORDER. COASTAL

LOPRES XPCD TO BOMB FRI NGT OVER COASTAL NC BFR DVLPG NNEWD TWD

HAMPTON ROADS AREA OF VA.

RESULT OF THIS MVMT WILL BE A VERY TIGHT PRESSURE GRADIENT AND

ENSUING STRONG NELY WINDS. HIGHEST WINDS XPCD FRI NGT THRU SAT

WITH GUSTS APRCHG 30KT IN COASTAL ZONES.

CONCERNING PCPN...SNOW XPCD TO FORM ACRS CNTRL FOOTHILLS...CNTRL

SHENANDOAH VLY AND SRN PORTIONS OF POTOMAC HIGHLANDS BY DAWN FRI.

SNOW WILL SPREAD NEWD ACRS RMNDR OF FCST AREA THRU FRI MRNG. EARLY

ONSET OF PCPN WILL LIMIT HEATING...AND MAXIMA FRI SHUD BE IN UPR

20S AND LWR 30S MOST AREAS.

AS UPR WAVE AND COASTAL SYSTEM APRCH...PCPN WILL BCM MDT TO HEAVY

BY LATE AFTN. SNOW TOTALS BY LATE FRI AFTN ARE XPCD TO BE IN 4-6

INCH RNG IN DC METRO AREA...UP TO ONE FOOT IN CNTRL SHENANDOAH VLY

AND CNTRL FOOTHILLS.

HEAVY SNOW XPCD AREAWIDE FRI NGT AS UPR SYSTEM MOVES ACRS. SFC LOW

MOVES NEWD ON SAT...AND SNOW BANDS XPCD TO DVLP ACRS DC/BALTIMORE

METRO AREAS IN DEFORMATION ZONE. ADDITIONAL MDT/HEAVY SNOW PSBL

SAT MRNG BFR ENTIRE SYSTEM MOVES AWAY AND SNOW INTENSITY WANES.

WINTER STORM WRNG FOR HEAVY SNOW CONTS THRU SAT EVE. HAVE ADJUSTED

SNOW TOTALS SLGTLY FROM PREV ISSUANCE...BUT SYNOPTIC EVOLUTION IS

SIMILAR TO PREV FCST. SOME VARIABILITY IN SNOW TOTALS FCST FOR SRN

MD AND ADJACENT PORTIONS OF VA WOULD BE PSBL IF SLEET DVLPS LATE

FRI NGT AS WARM AIR BRIEFLY WRAPS INTO SYSTEM. ATTM HAVE RETAINED

PRIMARILY SNOW FCST /WITH SNOW AND SLEET MIX INCLUDED IN GRIDS/...

BUT A PROLONGED PD OF SLEET COULD REDUCE TOTALS IN THIS AREA.-- End Changed Discussion --

&&

.LONG TERM /SUNDAY THROUGH THURSDAY/...

-- Changed Discussion --MAIN FOCUS OF EXTENDED PDS IS A STRONG CLOSED UPR LOW THAT MOVES

ACRS NRN CONUS TUE-WED AND DISLODGES ARCTIC ORIGIN AIR INTO OH

VLY. THIS SYSTEM MAY PROMOTE A ROUND OF LIGHT SNOW ACRS MUCH OF

FCST AREA TUE...WITH UPSLP FLOW AND A SEQUENCE OF SHRTWV TROFS IN

WAKE OF CLIPPER SYSTEM XPCD TO SUSTAIN SHSN FOR WRN SLOPES IN VERY

COLD AIR.-- End Changed Discussion --

&&

.AVIATION /20Z THURSDAY THROUGH TUESDAY/...

-- Changed Discussion --VFR CONDITIONS THROUGH THE OVERNIGHT HRS. A RAPID CHANGE IN

CONDITIONS WILL SPREAD NORTHEAST FRI MRNG. AREAS IN N-CNTRL VA

SUCH AS KCHO WILL SEE LIGHT-MOD SNOW MOVE IN CLOSER TO SUNRISE...

AND ONLY A COUPLE OF HRS LATER IN THE DC AND BALT METRO AREAS.

CONDITIONS WILL DETERIORATE QUICKLY BY EARLY AFTN...AS HEAVIER

SNOW BANDS AND A HEAVY...WET SNOW DROP CIGS/VSBYS ACROSS THE

REGION.

SUB-VFR CONDITIONS XPCD TO PERSIST THRU SAT EVE AS LOPRES MOVES

NEWD AND DEFORMATION ZONE DVLPS. PCPN ENDS QUICKLY SAT EVE...WITH

IMPROVED AVIATION CONDITIONS THRU MON.-- End Changed Discussion --

&&

.MARINE...

-- Changed Discussion --WINDS WILL BE MAINLY IN THE 10-15 KT RANGE THIS AFTN...SUB-SCA

CRITERIA. A GRADUAL DECREASE WILL OCCUR INTO THIS EVENING. SPEEDS

WILL STAY LIGHT OVERNIGHT INTO EARLY FRI.

PRESSURE GRADIENT TIGHTENS ACRS WATERS BY LATE FRI AFTN AS LOPRES

DEEPENS RAPIDLY OFF CAROLINA COAST. SMALL CRAFT ADZY THRESHOLD

WINDS XPCD FOR SRN PORTIONS OF CHSPK BAY AND TIDAL POTOMAC FRI

AFTN. GALE WRNG HAS BEEN ISSUED FOR MUCH OF MD CHSPK BAY AND LWR

TIDAL POTOMAC FRI NGT THRU SAT...WITH SMALL CRAFT ADZY POSTED FOR

RMNDR OF WATERS DURG THIS TIME.

SMALL CRAFT ADZYS MAY BE NEEDED LATE NEXT WEEK AS A CDFNT WITH

ARCTIC ORIGINS MOVES THRU MID-ATLC.-- End Changed Discussion --

&&

.LWX WATCHES/WARNINGS/ADVISORIES...

-- Changed Discussion --DC...WINTER STORM WARNING FROM 10 AM FRIDAY TO 10 PM EST SATURDAY

FOR DCZ001.

MD...WINTER STORM WARNING FROM 10 AM FRIDAY TO 10 PM EST SATURDAY

FOR MDZ003>007-009>011-013-014-016>018-501-502.

VA...WINTER STORM WARNING FROM 10 AM FRIDAY TO 10 PM EST SATURDAY

FOR VAZ028-031-042-052>057-501-502.

WINTER STORM WARNING FROM 6 AM FRIDAY TO 10 PM EST SATURDAY

FOR VAZ021-025>027-029-030-036>040-050-051.

WV...WINTER STORM WARNING FROM 10 AM FRIDAY TO 10 PM EST SATURDAY

FOR WVZ050>053-503-504.

WINTER STORM WARNING FROM 6 AM FRIDAY TO 10 PM EST SATURDAY

FOR WVZ054-055-501-502.

MARINE...GALE WARNING FROM 6 PM FRIDAY TO 6 PM EST SATURDAY FOR

ANZ531>534-537>543.

SMALL CRAFT ADVISORY FROM 2 PM TO 6 PM EST FRIDAY FOR ANZ533-

534-537-541>543.

SMALL CRAFT ADVISORY FROM 6 PM FRIDAY TO 6 PM EST SATURDAY FOR

ANZ530-535-536.-- End Changed Discussion --

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AFD from early Friday morning (apologies if it's been posted already):

AREA FORECAST DISCUSSION

NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC

251 AM EST FRI FEB 5 2010

.SYNOPSIS...

-- Changed Discussion --HIGH PRESSURE WILL MOVE AWAY FROM THE MID-ATLANTIC COAST TODAY

WHILE LOW PRESSURE DEVELOPS ALONG THE SOUTHEAST COAST. THE LOW

WILL RAPIDLY INTENSIFY AS IT MOVES UP THE MID-ATLANTIC COAST

TONIGHT AND THEN SLOWLY OUT TO SEA SATURDAY. HIGH PRESSURE WILL

BUILD IN BEHIND THIS SYSTEM SUNDAY AND MONDAY. ANOTHER STORM

SYSTEM MAY IMPACT THE REGION TUESDAY.-- End Changed Discussion --

&&

.NEAR TERM /TODAY/...

-- Changed Discussion --KUDOS TO THE MDLS WHICH HV BEEN PREDICTING A MAJOR MID ATLC STORM

FOR AT LEAST THE PAST 5 DAYS. ALSO KUDOS TO PRVS SHIFTS WHO DID

ALL THE HVY LIFTING W/ REGARD TO THE UPCOMING STORM...OUR ROLE TNGT

HAS BEEN MINOR TOUCH UPS.

WRNGS ARE ALREADY IN PLACE...AND RMN UNCHGD. WE DID UP THE SNOW

TOTALS SLTLY AT HIGHER ELEVS... WHERE INXS OF 30" MAY OCCUR BTWN

FRI MRNG AND LATE SAT. OTHER IMPORTANT CONSIDERATION WAS WHETHER

TO UP THE COUNTIES AGAINST THE BAY TO BLZRD WRNG. AFTER CONFERENCE W/

PHL...WHO ALTHO ISSUED FOR DE (ON THE CST) BUT NOT FOR THEIR MD

COUNTIES E OF THE BAY...WE`VE DECIDED TO HOLD. "NR BLZRD" WRDG WL

RMN IN THE WRNG. THESE CONDS WOULDN`T HAPPEN B4 TNGT

REGARDLESS...WHICH WL GIVE DAYSHIFT TIME TO EVALUATE FURTHER.-- End Changed Discussion --

&&

.SHORT TERM /TONIGHT/...

-- Changed Discussion --TNGT..WHEN CSTL LOW DEEPENS RAPIDLY E OF ORF...CONDITIONS WL

DETERIORATE TO XTRMLY POOR. TRAVEL SHOULD BE DISCOURAGED IN ALL

BUT THE MOST XTRM CASES. W/ STRONG UVV`S OVRNGT SNOWFALL RATES OF

1-2" PER HR WL BE COMMON ACROSS THE CWA. LOW TEMPS M20S HIGHLANDS

TO A30 ON THE CST.-- End Changed Discussion --

&&

.LONG TERM /SATURDAY THROUGH THURSDAY/...

-- Changed Discussion --STRONG SURFACE LOW OFF THE MID-ATLANTIC COAST WILL GRADUALLY MOVE

OUT TO SEA SATURDAY. THE UPPER-LEVEL LOW ASSOCIATED WITH THIS SYSTEM

WILL MOVE ACROSS OUR CWA...BRINGING MORE SNOW TO THE REGION. AS THE

LOW PRESSURE DOES DEPART OUT TO SEA...NORTHERLY WINDS BEHIND THE LOW

WILL BRING COLDER CONDITIONS ALONG WITH BLOWING AND DRIFTING SNOW.

TEMPERATURES WILL FALL THROUGH THE 20S SATURDAY AFTERNOON ACROSS

MOST LOCATIONS...BUT COLDER IN THE MOUNTAINS.

HIGH PRESSURE WILL BUILD OVER THE REGION SATURDAY NIGHT...BRINGING

AN END TO ANY LEFTOVER SNOW DURING THE EVENING HOURS. WILL CONTINUE

WITH THE WINTER STORM WARNING UNTIL 10 PM. MUCH COLDER CONDITIONS

ARE EXPECTED OVERNIGHT SATURDAY WITH TEMPERATURES IN THE SINGLE

DIGITS AND TEENS.

HIGH PRESSURE WILL BRING DRY AND COLD CONDITIONS SUNDAY AND MONDAY.

THE NEXT STORM SYSTEM MAY IMPACT THE REGION TUESDAY. HIGH PRESSURE

WILL BUILD OVERHEAD FOR THE MIDDLE OF THE WEEK.-- End Changed Discussion --

&&

.AVIATION /TODAY THROUGH TUESDAY/...

-- Changed Discussion --CGIS/VSBYS WL BEGIN THE MRNG AOA VFR LVLS AT MAJOR AIRPORTS...

DIMINISHING TO MVFR THIS MRNG AS LGT SNOW DVLPS...THEN IFR BY LATE

AFTN...AND FINALLY VLIFR THRUT TNGT.

IFR/SUBIFR CIGS AND VSBYS EXPECTED SATURDAY WITH SNOW AND BLOWING

SNOW. NORTH WINDS WILL GUST UP TO 25 KNOTS. HIGH PRESSURE WILL

APPROACH THE TERMINALS SATURDAY NIGHT...BRINGING AN END TO THE

SNOWFALL ALONG WITH VFR CIGS/VSBYS. WINDS WILL SLOWLY DIMINISH AS

WELL. HIGH PRESSURE WILL REMAIN IN CONTROL THROUGH MONDAY. ANOTHER

STORM SYSTEM MAY IMPACT THE TERMINALS TUESDAY.-- End Changed Discussion --

&&

.MARINE...

-- Changed Discussion --LGT WINDS THIS MRNG...INCRSG TO SCA VALUES IN THE LOWER BAY/PTMC

THIS AFTN. AS LOW PRES INTENSIFIES E OF ORF TNGT TO GALE ON THE

ENTIRE BAY AND LOWER PTMC TNGT...AND STRONG SCA ON THE UPPER PTMC.

HVY SNOWFALL/BLSN WL REDUCE VSBY TO 1/4 MILE. ALL CRAFT SHOULD

STAY IN PORT AFTR LATE AFTN TDA.

LOW PRESSURE WILL SLOWLY MOVE OUT TO SEA SATURDAY...BUT THE PRESSURE

GRADIENT WILL REMAIN STRONG BETWEEN THIS LOW AND APPROACHING SURFACE

HIGH FROM THE MIDWEST. A SMALL CRAFT ADVISORY REMAINS IN EFFECT FOR

THE UPPER TIDAL POTOMAC AND A GALE WARNING REMAINS IN EFFECT FOR THE

LOWER TIDAL POTOMAC AND CHESAPEAKE BAY THROUGH SATURDAY.

HIGH PRESSURE WILL SLOWLY BUILD TOWARD THE WATERS OVERNIGHT SATURDAY

AND SUNDAY. WINDS WILL DIMINISH...BUT SCA WIND GUSTS ARE STILL

LIKELY ACROSS PORTIONS OF THE CHESAPEAKE BAY AND LOWER TIDAL

POTOMAC. HIGH PRESSURE WILL BUILD OVERHEAD MONDAY BEFORE ANOTHER

STORM SYSTEM POSSIBLY IMPACTS THE WATERS TUESDAY.-- End Changed Discussion --

&&

.TIDES/COASTAL FLOODING...

-- Changed Discussion --AT THE MOMENT TIDES ARE AT OR STLY ABV NRML..BUT NOTHING ALARMING.

W/ STRONG NE FLOW XPCTD TO DVLP LATE THIS AFTN AND TNGT THIS WL

PREVENT WATER FM DRAINING AND CAUSE MINOR CSTL FLDG TNGT. LATER

SHIFTS WL MONITOR.-- End Changed Discussion --

&&

.LWX WATCHES/WARNINGS/ADVISORIES...

-- Changed Discussion --DC...WINTER STORM WARNING FROM 10 AM THIS MORNING TO 10 PM EST

SATURDAY FOR DCZ001.

MD...WINTER STORM WARNING FROM 10 AM THIS MORNING TO 10 PM EST

SATURDAY FOR MDZ003>007-009>011-013-014-016>018-501-502.

VA...WINTER STORM WARNING FROM 10 AM THIS MORNING TO 10 PM EST

SATURDAY FOR VAZ028-031-042-052>057-501-502.

WINTER STORM WARNING FROM 6 AM THIS MORNING TO 10 PM EST

SATURDAY FOR VAZ021-025>027-029-030-036>040-050-051.

WV...WINTER STORM WARNING FROM 10 AM THIS MORNING TO 10 PM EST

SATURDAY FOR WVZ050>053-503-504.

WINTER STORM WARNING FROM 6 AM THIS MORNING TO 10 PM EST

SATURDAY FOR WVZ054-055-501-502.

MARINE...GALE WARNING FROM 6 PM THIS EVENING TO 6 PM EST SATURDAY FOR

ANZ530>534-537>543.

SMALL CRAFT ADVISORY FROM 2 PM THIS AFTERNOON TO 6 PM EST THIS

EVENING FOR ANZ533-534-537-541>543.

SMALL CRAFT ADVISORY FROM 6 PM THIS EVENING TO 6 PM EST

SATURDAY FOR ANZ535-536.-- End Changed Discussion --

&&

$$

PRODUCTS...WOODY!/BJL/RDH

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Thanks Chris

You did pretty well with this too, didn't you?

I know for a while it was forecast to stay to your south but it did hit NYC

Mitch, it was actually a total miss up here... I remained in awe that it gave DC-PHL area 20 to 30 plus inches and while NYC did not see an inch. Truly one for the books!

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Still surprised that surprisingly large and north dry slot stopped just about there due to the pivot. Pretty sure it was never modeled to be anywhere close to NOVA, but goes to show you large storms can have large dry slots that aren't always well forecast. Some folks in Ill and Ind discovered that this week.

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I can still remember cashiering during that storm, and having to hide gallons of milk for myself and fellow cashiers during our ten minute breaks.

Or at one point being one of 2 cashiers in the whole storm, the night before it started(we weren't scheduled to have many people on that night, and although I begged people to stay late for me, with lines down the aisles, no one did, so it was me the night supervisor, the night cashier and the manager on duty(who was a new transfer from another low volume store, it was his first day) The store ran out of all produce, all milk(except organic, and there wasn't much of that left either) and all bread and most junk foods; it was kinda scary seeing all the shelves totally empty, and the people acting like the world was coming to an end(even funnier were the oblivious folks who came in and didnt understand why we were so busy) Or the lady who bitched me out because we did not have wrapping paper or party favors for her sons birthday party, and the kid throwing a temper tantrum(at that point it was already pouring snow.) WE had to shut down the courtesy desk just to be able to run enough registers(many angry gambling addicts that night)

Leaving around 11 that night, there was already 2-3" on the ground, and there were bulldozers plowing the parking lot. In the time it took for us to go around the car and clear snow off, it had already accumulated again.

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Here's some hourly obs I took during the storm:

10:00 a.m. 32.7 light snow beginning

11:00 a.m. 32.9 light snow, accumulation beginning on mulched surfaces

12:00 p.m. 31.8 light snow, accumulation beginning on grass

1:00 p.m. 32.1 light snow, light accumulation on grass

2:00 p.m. 32.0 moderate snow, light accumulation on grass, accumulation beginning on paved surfaces

3:00 p.m. 31.6 moderate snow, light accumulation on all surfaces

4:00 p.m. 31.6 snow becoming heavy, 1.0"

5:00 p.m. 31.6 heavy snow, 3.0"

6:00 p.m. 31.7 heavy, rimed snow, 4.5"

7:00 p.m. 31.3 heavy snow, 6.0"

8:00 p.m. 31.3 heavy snow, 8.5"

9:00 p.m. 31.2 heavy snow, 9.0"

10:00 p.m. 31.2 heavy snow, 10.0"

11:00 p.m. 30.5 heavy snow 11.9"

12:00 a.m. 30.2 heavy snow, 14.0"

1:00 a.m. 28.6 heavy snow, 15.0"

2:00 a.m. 28.1 heavy snow, 16.8"

3:00 a.m. 27.8 heavy snow, 18.0"

4:00 a.m. 27.7 heavy snow, 19.2"

5:00 a.m. 27.6 heavy snow, 20.5"

6:00 a.m. 27.5 heavy snow, 22.0"

7:00 a.m. 27.0 heavy snow, 23.8"

8:00 a.m. 26.5 heavy snow, 25.0"

9:00 a.m. 26.0 heavy snow, 26.0"

10:00 a.m. 25.8 heavy snow, 27.0"

11:00 a.m. 25.7 heavy snow, 28.0"

12:00 p.m. 25.5 snow tapering to flurries, 28.5"

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Man....this time last year, we were watching the radar fill in to the south, anticipating the arrival of 2-3 feet. I got so fookin drunk, underage and all. A great night for more than just the snow.....:devilsmiley:

This storm was a probably the most enjoyable living nightmare, I hated it as much as I loved it. I remember looking at the trees around 6PM, they were already caked with snow, no doubting the inevidable. I was gonna have a COLD night ahead of me.

I'll never forget the "craaaaaaaaaaack" every 10 minutes or so, beginning around midnight or so.....tree damage was the worst I've seen, beating out isabel. There were about 3 mature pine trees laying across heatherhill Court......on my block alone. Pine trees and Bradford Pears....they were hurt bad. All of my neighbors had some form of tree damage. Limbs, branches, and entire trees, just horrible.

We walked to helmsdale road around 2AM. We had to turn back, brutal. Then started a fire, and lost Power around 3AM. I ended up measuring once an hour, which probably inflated my totals a bit. I'd love to relive snowmageddon.

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Feb 5 2010 12 noon

MESOSCALE DISCUSSION 0098

NWS STORM PREDICTION CENTER NORMAN OK

1045 AM CST FRI FEB 05 2010

AREAS AFFECTED...ERN WV/SRN PA/NRN VA/MD/DE

CONCERNING...HEAVY SNOW

VALID 051645Z - 052045Z

A SIGNIFICANT WINTER STORM CONTINUES TO DEVELOP OVER PORTIONS OF THE

MID ATLANTIC. SNOWFALL RATES WILL QUICKLY INCREASE FROM 18-00Z WITH

INCH AN HOUR RATES BECOMING COMMON AND LOCALIZED RATES OF 2 INCHES

AN HOUR. RATES WILL FURTHER INCREASE BY 00Z...WITH 2-3 INCH AN HOUR

RATES AND RAPID ACCUMULATIONS THEREAFTER.

DRY LOW LEVELS REFLECTED ON 12Z SOUNDINGS ARE QUICKLY SATURATING

THIS MORNING...EVIDENCED BY RAPID DEW POINT INCREASES /2-3 DEGREES

PER HOUR VIA RECENT OBS/ AND TEMPERATURES SLOWLY DECREASING AS

EVAPORATIVE COOLING COMMENCES. CURRENT VAD WIND PROFILE DATA ACROSS

THE CAROLINAS/SWRN VA ARE SHOWING INTENSE WARM ADVECTION PROFILES

WITH VERY STRONG VEERING WINDS WITH HEIGHT...WHICH WILL FURTHER

SUPPORT DEEP LAYER SATURATION AS SIGNIFICANT MOISTURE /PWATS NEAR

150 TO 200 PERCENT OF NORMAL PER 12Z RAOBS/ ADVECTS NEWD. WEDGE

FRONT AND SUBTLE EFFECTS OF THE INITIAL EVAPORATIVE COOLING WILL

SUPPORT P-TYPE OF ALL SNOW AS TEMPERATURES AT THE SURFACE REMAIN

SUBFREEZING.

AS THE UPPER LOW CONTINUES TO SHIFT EWD WITH TIME...UPPER DYNAMICS

WILL BECOME INCREASINGLY FAVORABLE FOR AN INTENSIFICATION IN

SNOWFALL RATES AS VERTICAL MOTION INCREASES IN CONJUNCTION WITH

STRONG UPPER DIVERGENCE. LIGHT TO MODERATE SNOW IS ALREADY BEING

REPORTED...AND WILL LIKELY TRANSITION TO HEAVY SNOW BY AFTERNOON.

HEIGHT FALLS ARE INFLUENCING SURFACE PRESSURE FALLS NEAR ERN KY/WRN

VA OF 1 MB/HR OR GREATER...AND IN ERN NC NEAR 1.5 MB/HR AS

CYCLOGENESIS OCCURS. THE PRESSURE GRADIENT WILL CONTINUE TO INCREASE

THROUGH THE DAY ESPECIALLY IN VA/COASTAL AREAS AS A SURFACE LOW

QUICKLY DEEPENS AND MOVES UP THE COAST...CAUSING NEAR BLIZZARD-LIKE

CONDITIONS IN BLOWING SNOW. AS THIS OCCURS...ADDITIONAL ENHANCEMENT

WILL BE LIKELY ALONG UPSLOPE AREAS OF THE BLUE RIDGE AND APPALACHIAN

MOUNTAINS...AND ALONG THE IMMEDIATE COAST AS MOISTURE FLUX OCCURS

OVER THE OCEAN THEN SHIFTS INLAND NEAR THE DC/BALTIMORE METROPLEX IN

NELY/ELY LOW LEVEL FLOW.

..HURLBUT.. 02/05/2010

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It was exactly a year ago that the snow really got going.......I dropped my siblings off at their martial arts lesson Friday evening, and then decided to drive north just as the snow started to stick on the roads. There was probably 1-2" of snow at that point. It was a very wintry scene, slowly getting darker, and I kept driving north on York Road until I was up around Sparks, MD at Ensor Mill Road. Then I turned back, picked them up and got back home.

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