000
FXUS61 KLWX 271704 AAB
AFDLWX
AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1204 PM EST MON DEC 27 2010
.SYNOPSIS...
LOW PRESSURE WILL CONTINUE TO INTENSIFY AS IT MOVES TOWARD EASTERN
CANADA TODAY. HIGH PRESSURE WILL BUILD OVER THE REGION TONIGHT AND
IT WILL REMAIN IN PLACE THROUGH MUCH OF THE WEEK.
&&
.NEAR TERM /THROUGH TONIGHT/...
UPDATE...CANCELLED WIND CHILL ADVISORY AND THE NRN PORTION OF THE
WINTER WX ADVISORY...
FROM PREV DISC...
STRONG LOW PRESSURE SYSTEM ACCELERATING OFF THE NEW ENGLAND
COAST...JUST OFF CAPE COD THIS MORNING. A WAVE OF SUBSIDENCE IS
PUSHING STRONG GUSTY WINDS DOWN ACROSS THE MID ATLC/NEW ENGLAND
AND DOWN THE ERN SEABOARD. UPSLOPE SNOW SHOWERS CONTINUE ACROSS
THE CNTRL APLCNS AND SKIES ARE CLEARING OUT EAST OF THE MTNS. A
WIND ADVISORY REMAINS IN EFFECT ACROSS THE ENTIRE CWA FOR THE
DAYTIME AND EVE HRS...THOUGH WILL ASSESS ITS LONGEVITY TOWARD
SUNSET IF SOME OF THE HIGHER GUSTS SUBSIDE. MAX GUSTS THIS AFTN
40-50 MPH COMMON...THOUGH A MORE STEADY 30-40MPH RANGE EXPECTED.
ALTHOUGH AMBIENT TEMPS HAVE CLIMBED ABOVE FREEZING ACROSS THE
VA/MD PIEDMONT...IT WON/T FEEL LIKE IT WITH WIND CHILL VALUES
STILL SOLIDLY IN THE TEENS AND 20S. DEWPOINTS IN THE SINGLE DIGITS
WILL ALSO ADD TO THE DISCOMFORT FROM THE DRY NWLY WINDS.
&&
.SHORT TERM /TUESDAY THROUGH WEDNESDAY/...
P-GRAD SHUD BE RELAXING TNGT AS RDGG BLDS SFC AND ALOFT. WND ADVY
CURRENTLY RUNS THRU 02Z. DUE TO RDGG AND VERT PROFILES THAT DO NOT
FAVOR AMPLE MIXING...AM UNCERTAIN ABT 40 KT GUSTS AFTR SUNSET. AT
THE SAME TIME...DO NOT HV CONFIDENCE TO SHORTEN ADVY. NONETHELESS...
TRENDS WL BE DECREASING...W/ A STILL WINDY EVNG AND A BRZY OVNGT...
PARTICULARLY ACRS THE RDGS AND NRN MD. EVEN THO CLDS WL BE FEW-SCT
TEMPS WL BE HELD UP BY THE WNDS.
IT MAY STILL BE A LTL BRZY TUE...OTRW WL BE IN A TRANQUIL WX PD THRU
WED AS EFFECTS OF SFC HIPRES WL BE REALIZED. H8 TEMPS REBOUND RATHER
RAPIDLY...AND SHUD BE NEAR 0C THRU THE PD. WL FEEL THE IMPACT ON
TEMPS AS MAXT WL BE NEAR 40F. MIN-T TUE NGT WL STILL BE CHILLY THO
AS DEWPTS LOW...PERMITTING RADL COOLING INTO THE TEENS/LWR 20S AWAY
FM THE CITIES/BAY.
&&
.LONG TERM /WEDNESDAY NIGHT THROUGH SUNDAY/...
MED-LONG RANGE GUIDANCE INDICATING THAT THOUGH THE CNTRL/SRN PLAINS
STORM SYSTEM WILL BE STRONG AND BEGIN A TREK TOWARD THE EAST
THU/FRI...AT LEAST A COUPLE OF UPPER LEVEL TRANSITIONS COULD TAKE
PLACE BEFORE THE SYSTEM MAKES A MOVE EAST OF THE MS RVR. A DEEP
UPPER TROUGH THAT DIGS DOWN INTO THE DESERT SW WILL KEEP WAVE AFTER
WAVE OF VORTICIES READY TO SPIN-UP A LOW PRESSURE SYSTEM EAST OF THE
ROCKIES. WHICH ONE WILL EVENTUALLY PULL THE SYSTEM EWD WILL
MONITORED OVER THE COMING DAYS.
&&
.AVIATION /17Z MONDAY THROUGH FRIDAY/...
VFR CONDITIONS EXPECTED TODAY. SKIES WILL CONTINUE TO CLEAR...EAST
OF THE MTNS BUT THE STORY TODAY IS WIND. STRONG NORTHWEST WINDS
WILL CONTINUE THROUGH THIS AFTERNOON. WIND GUSTS OF 35-40 KNOTS
ARE EXPECTED ESPECIALLY FROM MID MORNING THROUGH THE AFTERNOON.
NW WNDS WL DIMINISH TNGT...BUT SHUD STILL HOLD ONTO GUSTS ARND 20
KT /XCPT PERHAPS FOR CHO/. WNDS WL BE REDUCED FURTHER ON TUE. OTRW
NSW XPCTD REST OF PD.
&&
.MARINE...
STRONG LOW PRESSURE WILL CONTINUE TO INTENSIFY AS IT HEADS TOWARD
EASTERN CANADA TODAY. A GALE WARNING REMAINS IN EFFECT FOR ALL OF
THE WATERS. WIND GUSTS OVER 40 KNOTS ARE EXPECTED...ESPECIALLY FROM
THE MID-MORNING HOURS THROUGH THE AFTERNOON.
P-GRAD WL GRDLY RELAX TNGT AS LRG CSTL STORM MIGRATES TWD THE CNDN
MARITIMES AND HIPRES BLDS OVR THE WATERS. THIS WL PERMIT GLW TO BE
REPLACED BY SCA. DOING SO WL BE A LTL COMPLEX THO. ATTM CAN ONLY
POST HEADLINES THRU THE END OF THE GLW...AND HV DONE SO IN A STAIR
STEP FASHION FM UPR PTMC TO MID BAY. ONCE WNDS SLIP BLO GLW...XPCT
SCA IN WNWLY FLOW THRU AT LEAST TUE. SLY WNDS MAY RTN FOR THE 2ND
HALF OF THE WK.
&&
.LWX WATCHES/WARNINGS/ADVISORIES...
DC...WIND ADVISORY UNTIL 9 PM EST THIS EVENING FOR DCZ001.
MD...WIND ADVISORY UNTIL 9 PM EST THIS EVENING FOR MDZ003>007-
009>011-013-014-016>018-501-502.
VA...WINTER WEATHER ADVISORY UNTIL 6 PM EST THIS EVENING FOR VAZ503.
WIND ADVISORY UNTIL 9 PM EST THIS EVENING FOR VAZ025>031-
036>040-042-050>057-501>504.
WV...WINTER WEATHER ADVISORY UNTIL 6 PM EST THIS EVENING FOR WVZ501-
505.
WIND ADVISORY UNTIL 9 PM EST THIS EVENING FOR WVZ050>053-055-
501>506.
MARINE...GALE WARNING UNTIL 3 AM EST TUESDAY FOR ANZ530>533-537>540-542.
GALE WARNING UNTIL 6 AM EST TUESDAY FOR ANZ534-541-543.
GALE WARNING UNTIL 9 PM EST THIS EVENING FOR ANZ535-536.
&&
$$
UPDATE...GMS
PREV DISCUSSION...LASORSA/HTS
