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
-- Highlight Changed Discussion --
-- Discussion containing changed information from previous version are highlighted. --
000 FXUS61 KLWX 230030 AFDLWX AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 830 PM EDT MON SEP 22 2014 .SYNOPSIS... CONTINENTAL HIGH PRESSURE WILL BUILD OVER THE AREA INTO TONIGHT AND PERSIST OVER NEW ENGLAND THROUGH MIDWEEK. A CUT OFF UPPER LEVEL LOW PRESSURE SYSTEM WILL DRIFT NORTH FROM THE SOUTHERN ATLANTIC COAST THROUGH THE MID-WEEK...POSSIBLY AFFECTING THE AREA WEDNESDAY NIGHT INTO FRIDAY. MORE HIGH PRESSURE IS ON TAP FOR THIS WEEKEND. && .NEAR TERM /THROUGH TUESDAY/... ENJOY THE FINAL TWO HRS OF SUMMER... QUITE A NICE SUNSET TNGT. HIGH PRES OVR THE RGN TNGT. DWPTS IN THE L40S GIVE AN AUTUMNAL FEEL TO THE AIR...AND W/ THE PSBLTY OF DWPTS/TEMPS DROPPING INTO THE 30S AT HIGHER ELEVS A FRST ADVSRY (!) IS IN EFFECT FOR THE HIGHLANDS. LOW TO MID 40S PIEDMONT AND WEST...UPR 40S COASTAL LOWLANDS...MID 50S URBAN AND NEARSHORE. MID 50S WOULD BE COOLEST NIGHT AT DCA OR DMH (MD SCIENCE CENTER) SINCE MAY 19. && .SHORT TERM /TUESDAY NIGHT THROUGH WEDNESDAY NIGHT/... SUNNY TUESDAY WITH LIGHT NORTH WINDS AND MAX TEMPS GENERALLY AROUND 70F. CLOUDS AHEAD OF THE CUTOFF LOW OVER THE SERN STATES PROBABLY ARRIVE TUESDAY NIGHT WITH ONSHORE FLOW MOISTENING THE LOWER LAYERS AND RAIN STARTING AT LEAST IN THE EAST BY WEDNESDAY EVENING. ECMWF IS MORE AGGRESSIVE/FARTHER WEST WITH PRECIP THAT THE GFS. OTHERWISE NEAR OR JUST BELOW NORMAL TEMPERATURES CONTINUE. && .LONG TERM /THURSDAY THROUGH MONDAY/... ECMWF 500MB CUT OFF LOW CENTERED OVER WEST VIRGINIA WILL OPEN UP WEDNESDAY AND MOVE TOWARD NEW ENGLAND. THE LOW MAY SUPPORT THE DEVELOPMENT OF A WEAK SURFACE LOW OVER SOUTHEAST VIRGINIA/ NORTHEAST NORTH CAROLINA. SLIGHT CHANCE OF PRECIPITATION ASSOCIATED WITH TO EXTEND INTO THE CWA THURSDAY NIGHT INTO FRIDAY. THERE IS A SLIGHT CHANCE OF MORE RAIN ACROSS THE CWA AS MODERATE PVA... MOIST WINDS OFF THE ATLANTIC COUPLED WITH A LOW PRESSURE SYSTEM MOVES ALONG A QUASI-STATIONARY BOUNDARY TO OUR SOUTH. && .AVIATION /00Z TUESDAY THROUGH SATURDAY/... LIGHT NLY FLOW TONIGHT AND TUESDAY WITH HIGH PRESSURE TO THE NORTH. ONSHORE FLOW WEDNESDAY INTO FRIDAY WITH POTENTIAL LOW CLOUDS. && .MARINE... NLY FLOW 10 TO 15 KT TONIGHT INTO TUESDAY. HIGH PRESSURE PERSISTS NORTH OF THE AREA...WITH AN ONSHORE FLOW WEDNESDAY INTO FRIDAY. SCA POSSIBLE WEDNESDAY THROUGH FRIDAY. && .TIDES/COASTAL FLOODING... A PERSISTENT ONSHORE FLOW IS EXPECTED TO DEVELOP WEDNESDAY. THIS WILL LEAD TO HIGHER THAN NORMAL WATER LEVELS PARTICULARLY OVER THE WESTERN SHORE OF THE CHESAPEAKE BAY. MINOR TIDAL INUNDATION IS POSSIBLE DURING HIGH TIDE STARTING WEDNESDAY NIGHT. && .LWX WATCHES/WARNINGS/ADVISORIES... DC...NONE. MD...FROST ADVISORY FROM 2 AM TO 9 AM EDT TUESDAY FOR MDZ501. VA...FROST ADVISORY FROM 2 AM TO 9 AM EDT TUESDAY FOR VAZ503-504. WV...FROST ADVISORY FROM 2 AM TO 9 AM EDT TUESDAY FOR WVZ501>503- 505-506. MARINE...NONE. && $$ UPDATE...WOODY! PRVS...BAJ/CMS

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