Area Forecast Discussion
Issued by NWS Sterling, VA

Current Version | Previous Version | Text Only | 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
-- Highlight Changed Discussion --
-- Discussion containing changed information from previous version are highlighted. --
000 FXUS61 KLWX 291855 AFDLWX AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 255 PM EDT WED JUL 29 2015 .SYNOPSIS...
-- Changed Discussion --
A COLD FRONT WILL CROSS THE AREA THU NIGHT. HIGH PRES WILL BUILD FOR THE WEEKEND AND HOLD THROUGH EARLY NEXT WEEK.
-- End Changed Discussion --
&& .NEAR TERM /THROUGH THURSDAY/...
-- Changed Discussion --
VERY WARM AND HUMID TODAY WITH DEWPOINTS IN THE MID 70S. SCT-NMRS SHOWERS AND ISOLD T-STORMS ONGOING PRIMARILY OVER NE MD. SIMILAR TO LAST NIGHT CONVECTION IS EXPECTED TO WIND DOWN DURING THE NIGHT WITH PATCHY DENSE FOG DEVELOPING AGAIN. LOTS OF CLOUDS WILL KEEP THINGS VERY WARM AND SULTRY WITH LOWS BARELY DROPPING BELOW 80F IN THE DISTRICT. CDFNT CURRENTLY MOVING THROUGH THE MIDWEST WILL ENTER THE FCST AREA AROUND 18Z THU AND SHOULD CLEAR THE FCST AREA BY 03Z FRI. FRONT WILL BE LOSING MUCH OF ITS PUNCH BUT IT APPEARS THERE COULD BE A QUICK BAND OF -SHRA/TSRA RIGHT ALONG OR JUST BEHIND THE FRONT.
-- End Changed Discussion --
&& .SHORT TERM /THURSDAY NIGHT THROUGH SATURDAY/...
-- Changed Discussion --
12Z MODEL SUITE HAS THE COLD FRONT PLACED JUST SOUTHEAST OF THE CWA BY 12Z FRIDAY. ANY LINGERING PCPN WITH THE FRONT SHOULD REMAIN TO THE SOUTH AS THE FRONTAL BOUNDARY STALLS AND EVENTUALLY DISSIPATES OVER THE WEEKEND. SFC HIGH PRESSURE BUILDS IN FROM THE WEST IN THE WAKE. THE REGION WILL REMAIN AT THE SOUTHERN FRINGE OF BROAD CLOSED LOW OVER CANADA...WITH THE SHORTWAVE ENERGY ROUNDING THE LOW REMAINING WELL TO THE NORTH. AS SUCH...EXPECTING DRY WX FRI AND FRI NIGHT. 12Z GFS SUGGESTING LIGHT PCPN OVER NORTHEASTERN AREAS OF THE CWA SAT AFTN WITH A SHORTWAVE JUST TO THE NORTH. WILL KEEP THINGS DRY FOR NOW THOUGH DURING THIS TIME WITH LACK OF SFC FORCING CURRENTLY NOTED. QUICK SHOT OF CAA IN THE WAKE OF THE FRONT ON FRIDAY DROP 850MB TEMPS TO AROUND 15 DEGREES CELSIUS...RESULTING IN HIGHS GENERALLY IN THE 80S. THE COOLER AIRMASS WILL BE SHORT LIVED AS THE HIGH BUILDS IN...WITH 850MB TEMPS REBOUNDING BACK TO NEAR 20 DEGREES CELSIUS BY SAT AFTN. LOWS FRIDAY NEAR NORMAL...WITH HIGHS NEARING 90 ON SATURDAY. DEW PTS IN THE 60S SAT SHOULD KEEP HEAT INDICES WELL BELOW ADVISORY LVLS.
-- End Changed Discussion --
&& .LONG TERM /SATURDAY NIGHT THROUGH WEDNESDAY/...
-- Changed Discussion --
QUIET WEATHER PATTERN FOR SUN INTO MON WITH HIGH PRESS DOMINATING CONDITIONS BEHIND A COLD FRONT. THE FRONT LINGERS OFF THE DELMARVA COAST AS IT WEAKENS... THEREFORE CANNOT RULE OUT SOME SHOWERS TO THE SE AND E OF OUR CWA. SHORTWAVE TROUGH COULD BRING SOME AFTN SHOWERS ON MON AND TUE... BUT CONFIDENCE WITH IT IS LOW ATTM... SO HAVE KEPT LOW POPS. ANOTHER FRONT APPROACHES ON WED INCREASING THE CHANCE OF SHOWERS AND TSTMS FOR THIS DAY. TEMPS WILL NEAR NORMAL SUN AND GRADUALLY INCREASING INTO HE LOW 90S FOR WED.
-- End Changed Discussion --
&& .AVIATION /19Z WEDNESDAY THROUGH MONDAY/...
-- Changed Discussion --
CHANCE OF A SHOWER OR T-STORM UNTIL 00Z TONIGHT. PATCHY DENSE FOG DEVELOPING LATE TONIGHT AT THE USUAL TROUBLE SPOTS. CDFNT WILL CROSS THE AREA THU AFTERNOON VFR CONDITIONS FRIDAY AND SATURDAY. WINDS GENERALLY 10 KTS OR LESS...SHIFTING FROM THE NW FRIDAY TO A WESTERLY FLOW SAT.
-- End Changed Discussion --
&& .MARINE...
-- Changed Discussion --
SRLY WINDS EXPECTED TO INCREASE TONIGHT OVER THE BAY AND CONTINUE THROUGH THE DAY THU. SCA WAS EXPANDED TO COVER THE ENTIRE LENGTH OF THE BAY. BRIEF PERIOD OF SCA GUSTS EARLY FRIDAY MORNING ON THE CHESAPEAKE BAY...WITH ALL WATERS BCMG SUB-SCA BY FRI AFT. SUB-SCA CONDITIONS THEN LASTING INTO THE WEEKEND.
-- End Changed Discussion --
&& .LWX WATCHES/WARNINGS/ADVISORIES...
-- Changed Discussion --
DC...NONE. MD...NONE. VA...NONE. WV...NONE. MARINE...SMALL CRAFT ADVISORY FROM 6 PM THIS EVENING TO 7 PM EDT THURSDAY FOR ANZ530>534-537-539>541-543.
-- End Changed Discussion --
&& $$ SYNOPSIS...LFR NEAR TERM...LFR SHORT TERM...SEARS LONG TERM...IMR AVIATION...SEARS/IMR/LFR MARINE...SEARS/IMR/LFR

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