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 260858 AFDLWX AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 358 AM EST MON JAN 26 2015 .SYNOPSIS...
-- Changed Discussion --
LOW PRESSURE WILL PASS BY TO THE SOUTH TODAY. THE LOW WILL RAPIDLY INTENSIFY AS IT MOVES OFF TO OUR NORTH AND EAST TONIGHT THROUGH TUESDAY. HIGH PRESSURE WILL BUILD OVERHEAD WEDNESDAY BEFORE ANOTHER CLIPPER SYSTEM SWINGS THROUGH THURSDAY INTO THURSDAY NIGHT.
-- End Changed Discussion --
&& .NEAR TERM /THROUGH TONIGHT/...
-- Changed Discussion --
ENHANCED WATER VAPOR IMAGERY CONTINUES TO SHOW A RATHER VIGOROUS UPPER SHORTWAVE TROUGH WITH ASSOCIATED SURFACE LOW TRACKING EAST ACROSS THE VA/NC BORDER EARLY THIS MORNING. PRECIPITATION ASSOCIATED WITH THIS CLIPPER SYSTEM WILL IMPACT THE MIDDLE ATLANTIC REGION THIS MORNING. COLD AIR HAS BEEN SLOW TO FILTER SOUTH OVERNIGHT. FREEZING TEMPERATURES HAVE BEEN RELEGATED MOSTLY ALONG THE MASON DIXON LINE AND POINTS JUST SOUTH. NORTHERLY WINDS WILL INCREASE LATER THIS MORNING INTO THIS AFTERNOON AS ENERGY TRANSFERS FROM THE CLIPPER SYSTEM TO THE CAROLINA COAST A BIT LATER TODAY. THIS WILL EVENTUALLY DRIVE THE COLD AIR SOUTH THROUGH THE FORECAST AREA. PRECIPITATION FORECAST REMAINS CHALLENGING FOR THE MIDDLE ATLANTIC REGION. SNOW WILL LIKELY PERSIST THROUGH THE MORNING HOURS FOR AREAS WELL NORTH AND WEST OF THE METRO AREAS. RAIN WILL DEVELOP OVER THE REMAINDER OF THE REGION. AS COLDER AIR SEEPS IN ON INCREASING NORTHERLY WINDS...WE EXPECT RAIN TO MIX WITH AND EVENTUALLY CHANGE TO SNOW FROM NORTH TO SOUTH. SLIPPERY TRAVEL WILL LIKELY RESULT ESPECIALLY FOR AREAS WELL NORTH AND WEST OF THE DC METRO AREA. AS THE CLIPPER LOW TRANSFERS TO THE COASTAL...A NORLUN TROUGH WILL LIKELY DEVELOP AND THIS FEATURE WILL ENHANCE SNOWFALL ACROSS THE REGION LATER THIS AFTERNOON INTO TONIGHT. TEMPERATURES AT THAT POINT WILL BE COLD ENOUGH TO SUPPORT SNOW JUST ABOUT EVERYWHERE AND FALLING SNOW WILL LIKELY CAUSE TRAVEL DISRUPTION THIS EVENING. ONCE THE COASTAL DEVELOPS IT WILL INTENSIFY RAPIDLY AND PULL AWAY FROM THE REGION TONIGHT. EARLIER INDICATION OF MORE SIGNIFICANT WRAP AROUND SNOWFALL ALONG AND EAST OF THE I-95 CORRIDOR DOES NOT APPEAR AS SIGNIFICANT. THREAT FOR WARNING LEVEL SNOW HAS DIMINISHED. HAVE EXPANDED WINTER WEATHER ADVISORIES EAST THROUGH THE I-95 CORRIDOR AND ALSO EXPANDED FURTHER SOUTH THROUGH 15Z TUESDAY. IMPACTS TO THIS EVENING COMMUTE AND SOME INTO THE TUESDAY AM COMMUTE CAN BE EXPECTED.
-- End Changed Discussion --
&& .SHORT TERM /TUESDAY THROUGH TUESDAY NIGHT/...
-- Changed Discussion --
EARLY SNOW WILL PERSIST MAINLY ACROSS EASTERN SECTIONS AND SOME UPSLOPE OVER THE POTOMAC HIGHLANDS. THE COASTAL LOW WILL PULL AWAY TO THE NORTH AND SNOW WILL GRADUALLY END DURING THE DAY. COLD TEMPERATURES WILL REMAIN IN PLACE WITH HIGHS ONLY REACHING THE 20S OUT WEST WITH 30S EAST OF THE BLUE RIDGE. GUSTY NORTHWEST WINDS WILL DROP WIND CHILLS INTO THE SINGLE DIGITS AND TEENS OUT WEST TO THE LOWER 20S EAST. WINDS WILL GRADUALLY DIMINISH LATE IN THE DAY. STRONG LOW PRESSURE OFF THE NEW ENGLAND COAST TUESDAY EVENING WILL HEAD TOWARD NOVA SCOTIA TUESDAY NIGHT. HIGH PRESSURE WILL APPROACH FROM THE OHIO VALLEY. A NORTHWEST FLOW BETWEEN THESE SYSTEMS WILL USHER IN DRY AND COLD CONDITIONS FOR MOST AREAS. A FEW UPSLOPE SNOW SHOWERS ARE POSSIBLE ALONG AND WEST OF THE ALLEGHENY FRONT...BUT SNOW ACCUMULATION SHOULD BE LIGHT.
-- End Changed Discussion --
&& .LONG TERM /WEDNESDAY THROUGH SUNDAY/...
-- Changed Discussion --
HIGH PRESSURE WILL BUILD OVERHEAD WEDNESDAY...BRINGING DRY AND COLD CONDITIONS. A CLIPPER SYSTEM WILL PASS THROUGH THE AREA THURSDAY INTO THURSDAY NIGHT. A PERIOD OF SNOW IS POSSIBLE WITH THIS SYSTEM...ESPECIALLY ACROSS THE NORTHERN HALF OF THE CWA. HIGH PRESSURE WILL RETURN FOR FRIDAY WITH DRY AND COLD CONDITIONS. A STORM SYSTEM MAY IMPACT THE AREA NEXT WEEKEND. WINTRY PRECIPITATION IS POSSIBLE. TIMING AND DETAILS ARE HIGHLY UNCERTAIN AT THIS TIME.
-- End Changed Discussion --
&& .AVIATION /09Z MONDAY THROUGH FRIDAY/...
-- Changed Discussion --
MVFR TO IFR TO PERSIST MUCH OF TODAY INTO TONIGHT WITH SNOW ACROSS THE NORTHERN TIER AND RAIN MIXING WITH AND CHANGING TO SNOW FROM BWI TO MTN TO IAD TO DCA THROUGH THE DAY. A STEADY LIGHT SNOW IS EXPECTED LATER THIS AFTERNOON AND EVENING ACROSS THE TERMINALS WITH TEMPERATURES AT OR BELOW FREEZING. THE SNOW WILL GRADUALLY END OVERNIGHT OR TUESDAY AM. NORTHWEST WINDS WILL CONTINUE TUESDAY NIGHT INTO WEDNESDAY WITH GUSTS AROUND 20 TO 25 KNOTS. VFR CONDITIONS ARE EXPECTED DURING THIS TIME. A CLIPPER SYSTEM MAY BRING A PERIOD OF SNOW TO THE TERMINALS LATER THURSDAY INTO THURSDAY NIGHT...ESPECIALLY ACROSS THE NORTHERN TERMINALS. HIGH PRESSURE WILL RETURN FRIDAY.
-- End Changed Discussion --
&& .MARINE...
-- Changed Discussion --
SCA CONDITIONS EXPECTED TO DEVELOP AS WINDS SHIFT INTO THE NORTH THIS MORNING. WILL SEE INCREASING WINDS ON THE WATERS ALONG WITH MIXED PRECIPITATION EVENTUALLY CHANGING TO SNOW LATER TODAY AND TONIGHT. GALE CONDITIONS ARE EXPECTED LATER TONIGHT INTO TUESDAY AS COASTAL LOW PRESSURE DEEPENS OFF THE MIDDLE ATLANTIC COAST. WINDS WILL EVENTUALLY DIMINISH LATE TUESDAY OR EARLY WEDNESDAY. GUSTY NORTHWEST WINDS ARE EXPECTED TUESDAY NIGHT THROUGH WEDNESDAY. A SMALL CRAFT ADVISORY WILL LIKELY BE NEEDED FOR THE WATERS DURING THIS TIME. A GALE WARNING MAY BE NEEDED FOR PORTIONS OF THE WATERS TUESDAY NIGHT. HIGH PRESSURE WILL BUILD OVERHEAD WEDNESDAY NIGHT. A CLIPPER SYSTEM WILL PASS THROUGH THURSDAY BEFORE HIGH PRESSURE RETURNS FRIDAY.
-- End Changed Discussion --
&& .LWX WATCHES/WARNINGS/ADVISORIES...
-- Changed Discussion --
DC...WINTER WEATHER ADVISORY UNTIL 10 AM EST TUESDAY FOR DCZ001. MD...WINTER WEATHER ADVISORY UNTIL 10 AM EST TUESDAY FOR MDZ004>006- 011-013-014-503>508. WINTER STORM WARNING UNTIL 10 AM EST TUESDAY FOR MDZ003-501- 502. WINTER WEATHER ADVISORY FROM 4 PM THIS AFTERNOON TO 10 AM EST TUESDAY FOR MDZ016>018. VA...WINTER WEATHER ADVISORY UNTIL 10 AM EST TUESDAY FOR VAZ025>027- 029>031-039-040-051>054-501>508. WINTER STORM WARNING UNTIL 10 AM EST TUESDAY FOR VAZ028. WINTER WEATHER ADVISORY FROM 4 PM THIS AFTERNOON TO 10 AM EST TUESDAY FOR VAZ037-038-050-055>057. WV...WINTER WEATHER ADVISORY UNTIL 10 AM EST TUESDAY FOR WVZ505-506. WINTER STORM WARNING UNTIL 10 AM EST TUESDAY FOR WVZ050>053- 055-501>504. MARINE...SMALL CRAFT ADVISORY UNTIL 6 PM EST THIS EVENING FOR ANZ530>534-537>543. SMALL CRAFT ADVISORY FROM 6 AM TO 7 PM EST TUESDAY FOR ANZ530>534-537>543. GALE WARNING FROM 6 PM THIS EVENING TO 6 AM EST TUESDAY FOR ANZ530>534-537>543. SMALL CRAFT ADVISORY UNTIL 7 PM EST TUESDAY FOR ANZ535-536.
-- End Changed Discussion --
&& $$ SYNOPSIS...BJL NEAR TERM...KRW SHORT TERM...BJL/KRW LONG TERM...BJL AVIATION...BJL/KLW MARINE...BJL/KLW

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