Area Forecast Discussion
Issued by NWS Sterling, VA

Current Version | Previous Version | Graphics & Text | Print | Product List | Glossary Off
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
-- Remove Highlighting --
-- Discussion containing changed information from previous version are highlighted. --
000 FXUS61 KLWX 241952 AFDLWX AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 252 PM EST TUE FEB 24 2015 .SYNOPSIS...
-- Changed Discussion --
HIGH PRESSURE PUSHES OFFSHORE THIS EVENING. A COLD FRONT WILL PASS THROUGH THE MID ATLANTIC STATES TONIGHT INTO WEDNESDAY. LOW PRESSURE WILL TRACK ACROSS GEORGIA AND OUT TO SEA WEDNESDAY NIGHT. HIGH PRESSURE WILL RETURN FOR THE LATTER PART OF THE WEEK.
-- End Changed Discussion --
&& .NEAR TERM /TONIGHT/...
-- Changed Discussion --
NO PROBS FORESEEN WX-WISE TNGT. WARM FNT OVR OH WL BE MOVG INTO THE AREA OVRNGT...BUT SOME CLD IS THE ONLY SENSIBLE WX THAT WL OCCUR W/ THIS - PERHAPS LGT SN IN THE HIGHLANDS BUT THAT IS LOW CHC. TEMPS WL BE QUITE A BIT WARMER THAN LAST NGT...BUT PERHAPS THAT IS NOT SAYING MUCH GIVEN TEMPS AS LOW AS -17 WERE SEEN IN THE HIGHLANDS AND -4 AT IAD. LOWS IN THE SINGLE DIGITS IN THE HIGHLANDS...U TEENS MUCH OF THE AREA...L20S IN THE CITIES.
-- End Changed Discussion --
&& .SHORT TERM /WEDNESDAY/...
-- Changed Discussion --
WED HIGH PRES OVR THE AREA. GIVEN LATE FEB SUN TEMPS SHOULD RISE TO 35-40 E OF THE BLU RDG...M20S IN THE HIGHLANDS.
-- End Changed Discussion --
&& .LONG TERM /WEDNESDAY NIGHT THROUGH MONDAY/...
-- Changed Discussion --
24.12Z MODEL GUIDANCE HAS INCHED NORTHWARD WRT TRACK OF SOUTHERN STREAM LOW PRESSURE MOVING TO A POSITION EAST OF CAPE HATTERAS BY 12Z THURSDAY. OF ADDITIONAL CONCERN IS THE POSSIBILITY OF AN AREA OF LIFT ACROSS THE NORTHWESTERN PERIPHERY WHERE MODELS MAY BE UNDERDOING QPF GENERATION. FOR THIS ISSUANCE HAVE RAISED POPS TO LIKELY FROM HIGHLAND TO ST MARYS COUNTIES...ALTHOUGH THESE MAY ULTIMATELY NEED TO BE RAISED HIGHER AND EXTEND FARTHER NORTH. BRUNT OF STORM STILL STAYS SOUTH OF THE AREA THOUGH...SO ACCUMULATIONS WOULD BE A FEW INCHES AT THE MAX. HOWEVER WITH OVERNIGHT LOWS IN THE TEENS TO LOWER 20S...ROADWAY ACCUMULATIONS WOULD BE POSSIBLE FOR THE MORNING COMMUTE. THE LOW WILL MOVE QUICKLY OFFSHORE THURSDAY BUT STRONG CAA WILL HOLD OFF UNTIL LATER IN THE DAY. HOWEVER TEMPERATURES WILL STILL STRUGGLE TO REACH THE FREEZING MARK. CLOUDY CONDITIONS WILL PERSIST AND SOME FLURRIES OR SNOW SHOWERS COULD DEVELOP...PARTICULARLY IN THE UPSLOPE AREAS. THE EVENING HOURS MAY BE THE MOST FAVORABLE TIME FOR SNOW SHOWERS TO MOVE EAST OF THE DIVIDE AS THE 850MB TROUGH AND MID-LEVEL PVA CROSS THE AREA. LOW TEMPERATURES WILL FALL INTO THE TEENS WITH SINGLE DIGITS NEAR THE PA BORDER AND IN THE HIGHLANDS. DEEP MEAN TROUGH WILL PERSIST OVER THE EASTERN CONUS THROUGH THE PERIOD BUT ABATE SLIGHLTLY BY THE MIDDLE OF NEXT WEEK. MEANWHILE...SUBTROPICAL RIDGING WILL BEGIN TO AMPLIFY OVER THE SOUTHEASTERN CONUS. THIS WILL SET THE STAGE FOR A COUPLE OF OVERRUNNING/PERHAPS MIXED P-TYPE EVENTS LATE IN THE WEEKEND INTO EARLY NEXT WEEK AS MODERATING AIRMASS ALOFT MOVES OVER RESIDUAL COLD AIR AT THE SURFACE. THE OVERALL PATTERN WILL BE FOR A TREND IN MODERATING TEMPERATURES THROUGH THE MIDDLE OF NEXT WEEK HOWEVER.
-- End Changed Discussion --
&& .AVIATION /19Z TUESDAY THROUGH SUNDAY/...
-- Changed Discussion --
VFR CONDS XPCTD TNGT/WED. MVFR/IFR CONDITION POSSIBLE LATE WED EVENING-EARLY THU MORNING WITH LIGHT SNOW. HIGHER PROB OF OCCURRENCE AT KCHO WITH MORE UNCERTAINTY ACROSS THE NORTHERN TERMINALS. REDUCED CIGS MAY LINGER INTO THU NIGHT AND CANNOT RULE OUT FLURRIES OR A SNOW SHOWER AT TIMES. MAINLY VFR FRI-SAT...THOUGH SOME SUB-VFR POSSIBLE IN ISO -SHSN WRN TERMINAL FRI PM. SLY FLOW AROUND 10 KTS BECOMES WLY 10-20 KTS FRI NIGHT-SAT BEHIND COLD FRONT.
-- End Changed Discussion --
&& .MARINE...
-- Changed Discussion --
WINDS XPCTD TO RMN BLO SCA TNGT/WED. LOW PRESSURE WILL PASS OFF CAPE HATTERAS LATE WEDNESDAY NIGHT. THIS WILL BRING THE POSSIBILITY OF LIGHT SNOW. ALSO NORTHERLY WINDS MAY REACH SCA LEVELS FOR PORTIONS OF WEDNESDAY NIGHT INTO THURSDAY MORNING. WINDS ARE MORE MARGINAL THURSDAY NIGHT BUT MAY ULTIMATELY BE GUSTY WITH COLDER AIR RUSHING IN. SCA GUSTS POSSIBLE FRI AFT IN SLY CHANNELING...MORE LIKELY FRI NIGHT-SAT IN WLY PRESSURE SURGE BEHIND FRONT.
-- End Changed Discussion --
&& .LWX WATCHES/WARNINGS/ADVISORIES... DC...NONE. MD...NONE. VA...NONE. WV...NONE. MARINE...NONE. && $$ PRODUCTS...WOODY!/ADS/DFH

USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.