000 FXUS61 KLWX 101426 AFDLWX AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 926 AM EST WED FEB 10 2010 .SYNOPSIS... LOW PRESSURE WILL MOVE OFF OF THE COAST OF THE CAROLINAS TODAY AND THEN UP THE EASTERN SEABOARD OVERNIGHT AND THURSDAY. THIS LOW PRESSURE SYSTEM WILL BRING ANOTHER ROUND OF WINTRY PRECIPITATION TO THE AREA...ALONG WITH GUSTY WINDS. HIGH PRESSURE WILL BUILD OVER THE AREA FOR THE LATTER HALF OF THE WEEK. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... SURGE OF COLD AIR HAS BROUGHT A SNW SQUALL W/ BLIZZARD CONDS. HV UPDTD FCST TO REFLECT THAT. HV NOT TOUCHED SNW ACCUMS. HWVR WNDS MAKING ACCURATE SNW MEASUREMENT VERY PROBLEMATIC. THE BLOWING AND DRIFTING A MUCH BIGGER CONCERN. A BACK EDGE TO THE PCPN SHIELD EVIDENT ACRS CENTL VA ATTM. WL NEED TO REASSESS WSW HEADLINES SHORTLY. AT THE SAME TIME WL ASSESS NEED FOR WND ADVY HEADLINES WHERE BLIZZARD WNRGS NOT CURRENT. && .SHORT TERM /6 PM THIS EVENING THROUGH 6 AM THURSDAY/... UPSLOPE SNOW WILL CONTINUE FOR THE CNTRL APLCNS WELL AFTER THE COASTAL LOW HAS MOVED OFF THE MID ATLC COAST THRU THURSDAY AFTN. MODERATE SNOW ACCUMULATION POSSIBLE FOR THE HIGHER ELEVATIONS DURING THIS PERIOD. E OF THE MTNS...DRY-COLD AND WINDY WX WILL REPLACE THE EXITING LOW PRESSURE SYSTEM. && .LONG TERM /THURSDAY THROUGH TUESDAY/... NO MAJOR CHANGES TO THE LONG TERM PORTION OF THE FORECAST WERE MADE. UPSLOPE SNOW SHOWERS WILL BEGIN TO WANE ON THURSDAY AS HIGH PRESSURE BUILDS IN FROM THE WEST. HAVE KEPT POPS PRETTY HIGH ACROSS THE WESTERN RIDGES...BUT SNOW SHOULD COMPLETELY CUT OFF BY EARLY FRIDAY. TEMPERATURES ARE EXPECTED TO REMAIN BLO FREEZING FOR MOST LOCALES THURSDAY AND THURSDAY NIGHT...BUT ABOVE FREEZING MAX TEMPS ARE EXPECTED FRIDAY AND SATURDAY. A COLD FRONT COMES THROUGH THE REGION DURING THE WEEKEND...WITH HIGH PRESSURE BUILDING IN FOR THE FIRST PART OF NEXT WEEK. && .AVIATION /14Z WEDNESDAY THROUGH SUNDAY/... A LARGE BAND OF MODERATE TO HEAVY SNOW HAS WILL SET-UP OVER THE DC- BALT METRO AREA...AS WINDS ALSO INCREASE OUT OF THE WNW. WNDY CONDS WL LAST FOR THE NEXT 24-36 HRS. GUSTS NEAR 40KT WILL BE COMMON THRU THE AFTN/EVENING...SUBSIDING ONLY A BIT OVERNIGHT AND LASTING INTO THU. IFR/LOWER EXPECTED ACROSS THE REGION FOR THE NEXT SEVERAL HRS. SLOW IMPVMNT LT TDA-TNGT. CIGS/VSBYS ARE EXPECTED TO REMAIN VFR THROUGH THURSDAY AT MOST LOCALES. HOWEVER...BLOWING SNOW MAY LOCALLY REDUCE SOME VSBYS BLO VFR AT TIMES WHERE WINDS ARE THE MOST GUSTY. HIGH PRESSURE BUILDS IN FOR THE REMAINDER OF THE WEEK AND NO CIGS/VSBY RESTRICTIONS ARE ANTICIPATED. && .MARINE... WNDS WL INCR TO GLW THIS MORNING. A STRONG LOW PRESSURE SYSTEM AFFECTING THE REGION WILL INCREASE WINDS OVER THE WATERS LASTING INTO THU. GALE CONDITIONS ARE EXPECTED TO CONTINUE THROUGH MOST OF THURSDAY AS LOW PRESSURE MOVES UP THE EASTERN SEABOARD. THE GRADIENT IS EXPECTED TO LESSEN THURSDAY EVENING AND OVERNIGHT AS HIGH PRESSURE BUILDS IN FROM THE WEST. HOWEVER...SMALL CRAFT CONDITIONS ARE LIKELY THROUGH THIS PERIOD. TO LESSEN CONFUSION...WILL NOT TACK ON THE SCA HEADLINE ON THE END OF THE GALE. WILL MENTION IN THE SYNOPSIS AND HAVE 20 PLUS KT IN THE TEXT. HIGH PRESSURE BUILDS IN FOR THE LATTER PART OF THE WEEK...AND LIGHTER WINDS ARE EXPECTED. && .LWX WATCHES/WARNINGS/ADVISORIES... DC...BLIZZARD WARNING UNTIL 7 PM EST THIS EVENING FOR DCZ001. MD...BLIZZARD WARNING UNTIL 7 PM EST THIS EVENING FOR MDZ003>007- 009>011-013-014-016>018. BLIZZARD WARNING UNTIL 4 PM EST THIS AFTERNOON FOR MDZ502. BLIZZARD WARNING UNTIL 7 AM EST THURSDAY FOR MDZ501. VA...BLIZZARD WARNING UNTIL 7 PM EST THIS EVENING FOR VAZ028-030- 031-042-052>055-057-501-502. WINTER STORM WARNING UNTIL 4 PM EST THIS AFTERNOON FOR VAZ025>027-029-036>039. BLIZZARD WARNING UNTIL 7 AM EST THURSDAY FOR VAZ021. WINTER STORM WARNING UNTIL 7 PM EST THIS EVENING FOR VAZ040- 050-051-056. WV...BLIZZARD WARNING UNTIL 7 PM EST THIS EVENING FOR WVZ052-053. BLIZZARD WARNING UNTIL 4 PM EST THIS AFTERNOON FOR WVZ050-051- 055-502-504. BLIZZARD WARNING UNTIL 7 AM EST THURSDAY FOR WVZ054-501-503. MARINE...GALE WARNING UNTIL 6 PM EST THURSDAY FOR ANZ530>543. && $$ SYNOPSIS... NEAR TERM...HTS SHORT TERM...GMS LONG TERM...LISTEMAA AVIATION...HTS/GMS/LISTEMAA MARINE...HTS/GMS/LISTEMAA