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Winter storm 12/8-9 Observations/Nowcasting


ThePhotoGuy

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FXUS61 KLWX 081937
AFDLWX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
237 PM EST SUN DEC 8 2013

.SYNOPSIS...

LOW PRESSURE WILL MOVE NORTHEAST ACROSS THE MID-ATLANTIC TODAY
THROUGH MONDAY. AN UPPER-LEVEL DISTURBANCE WILL PASS THROUGH THE
AREA TUESDAY. CANADIAN HIGH PRESSURE WILL BUILD OVERHEAD FOR THE
SECOND HALF OF THE WEEK.

&&

.NEAR TERM /THROUGH TONIGHT/...

18Z IAD BALLOON SHOWS SLT WRMG OVR 12Z...BUT ATMOSPHERIC COLUMN
RMNS BLO FRZG...ALTHO ARND 700 MB THE TEMP LN IS DRAWING CLOSE.
FURTHER SW...THE RNK SNDG SHOWS SIG WRMG SINCE 12Z W/ AN ABV-FRZG
LYR FM 850 TO 700MB...BUT THEN DROPPING BLO FRZG TO THE SFC. A
TEXT BOOK FZRA SNDG.

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237pm LWX AFD update

 

.NEAR TERM /THROUGH TONIGHT/...

18Z IAD BALLOON SHOWS SLT WRMG OVR 12Z...BUT ATMOSPHERIC COLUMN
RMNS BLO FRZG...ALTHO ARND 700 MB THE TEMP LN IS DRAWING CLOSE.
FURTHER SW...THE RNK SNDG SHOWS SIG WRMG SINCE 12Z W/ AN ABV-FRZG
LYR FM 850 TO 700MB...BUT THEN DROPPING BLO FRZG TO THE SFC. A
TEXT BOOK FZRA SNDG.

BUT THE STORY OF TDA WL BE THE SNOW TOTALS ACROSS NERN MD. 6-8"
HAS FALLEN FM FREDERICK TO HARFORD. ACROSS THE NRN HALF OF THE
FCST AREA DUAL POL CC NOW SHOWS RETURNS OF "NON MET UNIFORM" WHICH
IMPLIES THE SNOW IS NOW CHANGING TO SLEET...SO HIGHER SNOW TOTALS
NOT XPCTD. WE ARE NOW RCVG SPOTTER REPORTS OF PCPN CHANGING TO
SLEET AS WELL.

STLT W.V. IMGRY SHOWS THE WAVE CAUGHT UP IN THE SW-NE UPR WIND
FLOW ACROSS ERN W.V. AND NERN MD WHICH INTENSIFIED OVR MD. BUT THE
HEAVIEST PCPN IN ASSO W/ THIS BAND IS MOVG INTO SRN NJ. RDR AND
SFC OBS SHOW THE PCPN TO THE W HAS BECOME MORE SPOTTY...AND WL BE
LGT FOR THE RMDR OF THE AFTN. THE NEXT WV WL MOVE INTO THE AREA
THIS EVE. WE RMN CONCERNED ABT THE PSBLTY OF FZRA TNGT GIVEN THE
SUBFRZG TEMPS STILL XPCTD. THE WSW WL RMN IN EFFECT FOR THE OVRNGT
HRS.

LOWS IN THE U20S/L30S.
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We have been dryslotted since about 11 AM here after some really nasty pingers and ZR.  Temp is 27 degrees, but we need QPF down here!  Hopefully the batch later on will provide.  Congrats to y'all in the North.  You guys deserve this one.

Agree 100%. Many in and around there have gone close to two years with marginal 'whiteness'. Enjoy! :)

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