Increasing moisture ahead of an approaching cold front led to valley dense fog development.
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The episode as NWS LWX wrote it up.
Increasing moisture ahead of an approaching cold front led to valley dense fog development.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Baltimore/Washington wrote its last area forecast discussion before the first event at Jun 6, 2:59 AM EST, 1 hour 1 minute earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 359 AM EDT SAT JUN 6 2015 .SYNOPSIS... A COLD FRONT WILL SLIDE SOUTH ACROSS THE AREA TODAY PRODUCING A FEW SHOWERS AND THUNDERSTORMS. PRIMARILY DRY AND SLIGHTLY COOLER WEATHER WILL ENVELOP THE AREA SUNDAY AS HIGH PRESSURE DOMINATES. ANOTHER COLD FRONT WITH MORE ENERGY WILL CROSS THE AREA MONDAY INTO TUESDAY. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... WV IMAGERY SHOWS REMNANTS OF UPPER LOW EAST OF DELMARVA EARLY THIS MORNING...WHILE ANOTHER SHORTWAVE TROUGH DIGS INTO THE CENTRAL APPALACHIANS. SCATTERED SHOWERS ARE ACCOMPANYING THIS TROUGH (RUMBLE OF THUNDER NOT OUT OF QUESTION) AND WILL AFFECT NORTHERN MD EARLY THIS MORNING. OTHER SHOWERS MAY BRUSH A PART OF THE WESTERN HIGHLANDS. THE OTHER ISSUE IS FOG. SO FAR MID LEVEL CLOUDS HAVE HELD MOST VSBYS IN CHECK...BUT STILL SEVERAL HOURS OF DARKNESS TO GO. WILL MONITOR OBS FOR NEED OF A STATEMENT/ADVISORY...BUT DO NOT THINK DENSE FOG WILL BE WIDESPREAD OVERALL. GREATEST COVERAGE PERHAPS IN WESTERN MOUNTAIN VALLEYS. SFC FRONT CONTINUES TO PUSH SOUTH TODAY...WHILE CENTER OF UPPER LEVEL FEATURE WILL CROSS NE MD. VORT MAX WILL COMBINE WITH SLIGHTLY STEEPER LAPSE RATES TO BRING CONVECTIVE POTENTIAL ACROSS THE AREA TODAY. SYNOPTIC AND MESOSCALE MODELS HAVE SOME DIFFERENCES ON HOW TO HANDLE THE CONVECTION...BUT THE HIGHEST CHANCES APPEAR TO BE EAST OF DC DURING MIDDAY...SHIFTING SOUTH/WEST WITH TIME AND PERHAPS TAKING ON A MORE DIURNAL/SCATTERED NATURE AS THE WAVE LOSES INFLUENCE. POSSIBLE GREATEST CONVECTIVE COVERAGE OCCURS EAST OF THE CWA. DEEP LAYER SHEAR DOES INCREASE SLIGHTLY OVER THE MOUNTAINS IN THE BASE OF THE WAVE...BUT GREATER INSTBY IS EXPECTED CLOSER TO THE BAY. SOME BREAKS IN CLOUDS WILL ALLOW HIGHS TO APPROACH 80. && .SHORT TERM /6 PM THIS EVENING THROUGH SUNDAY NIGHT/... TONIGHT...SFC FRONT PUSHES SOUTH AND SHOULD END THE THREAT OF SHOWERS. HIGH PRESSURE WILL SLIDE NORTH OF THE AREA AND SPILL SOUTHWARD EAST OF THE APPALACHIANS. A NE FLOW WILL BRING LOWER DEW POINTS BUT AT THE SAME TIME SOME LOW CLOUDS MAY DEVELOP...ESPECIALLY OVER THE MOUNTAINS DUE TO THE UPSLOPE MARINE INFLUENCE. LOW TEMPERATURES MID 50S TO LOWER 60S. THE NORTHERN STREAM IS PROGRESSIVE WHICH MEANS THE SFC HIGH WILL CONTINUE EAST ON SUNDAY. RETURN FLOW WILL BEGIN...BUT MAY HOLD OFF UNTIL LATE IN THE DAY. A FEW SHOWERS AND STORMS MAY DEVELOP IN THE WESTERN HIGHLANDS WITH WEAK CONVERGENCE AND INSTBY...BUT BALANCE OF THE AREA SHOULD BE DRY WITH PARTLY TO MOSTLY SUNNY SKIES. TEMPERATURES WILL BE A LITTLE BELOW AVERAGE...MID 70S TO AROUND 80. SUNDAY NIGHT...HIGH PRESSURE WILL BE SLIDING OFF THE EAST COAST WITH A SOUTHWESTERLY RETURN FLOW. ANY DIURNAL SHOWERS AND THUNDERSTORMS OVER THE MOUNTAINS WILL PROBABLY WEAKEN AND DISSIPATE. THE GFS HOWEVER BRINGS A BAND OF PRECIPITATION QUICKLY EAST AHEAD OF AN APPROACHING COLD FRONT FROM THE GREAT LAKES VIA A LEADING SHORTWAVE...WITH THE PRECIP REACHING DC BY MONDAY MORNING. FOR THE TIME BEING THIS SCENARIO WAS MOSTLY DISCOUNTED. LOWS SUNDAY NIGHT SHOULD BE A BIT MILDER WITH THE INCREASED HUMIDITY ON THE RETURN FLOW. && .LONG TERM /MONDAY THROUGH FRIDAY/... ON MONDAY...THE COLD FRONT PUSHES EAST AND ENTERS PENNSYLVANIA. AGAIN GFS IS NOTABLY FURTHER SOUTH AND EAST WITH PRECIPITATION LIKELY ASSOCIATED WITH VORT MAXES AHEAD OF THE MAIN SYSTEM BUT MOST GUIDANCE HAS A THREAT OF SHOWERS AND THUNDERSTORMS BY DAY'S END ACROSS MUCH OF THE CWA...ESPECIALLY N AND W OF I-95. WITH A DECENT SHORTWAVE AND PERHAPS MORE CAPE THAN THE GFS IS SHOWING...THERE IS POTENTIAL FOR SEVERE WEATHER. DID NOT ADD ENHANCED WORDING JUST YET HOWEVER AS UNCERTAINTY REMAINS NOTABLE GIVEN GFS. HIGHS MONDAY WILL SURGE SEVERAL DEGREES WARMER THAN SUNDAY ON THE SOUTHERLY FLOW AHEAD OF THE FRONT. MONDAY NIGHT THE COLD FRONT SLIDES ACROSS THE AREA. THE EVENING HOURS MAY BE THE BEST TIME FOR ANY STRONG TO SEVERE THUNDERSTORMS AND MOST GUIDANCE HITS THIS TIME HARDEST...THUS HAVE LIKELY POPS IN MOST OF CWA FOR THIS TIME FRAME. THUNDER SHOULD WANE LATER AT NIGHT AS THE FRONT SLIDES ACROSS AND SURFACE INSTABILITY WANES. LOWS WILL REMAIN MILD WITH THE CLOUDS AND POTENTIAL FOR PRECIP. ON TUESDAY THE FRONT SLIDES JUST BEYOND OUR CWA BORDERS BUT THE PASSAGE OF THE UPPER LEVEL TROUGH WILL WAIT UNTIL TUESDAY NIGHT AND THE FRONT WILL NOT BE FAR AWAY. THEREFORE THE RISK OF SHOWERS AND THUNDERSTORMS WILL NOT COMPLETELY VANISH...PARTICULARLY IF THE FRONT DOES NOT PROGRESS QUITE SO FAST. HAVE KEPT SLIGHT CHANCE AND CHANCE POPS WITH BEST ODDS SOUTH. DESPITE THE FRONT'S PASSAGE...HIGHS WILL ONLY DIMINISH SLIGHTLY IF AT ALL AS THE MAIN THRUST OF COOLER AIR WILL HEAD EAST INSTEAD OF SOUTH. WEAK HIGH PRESSURE WILL FINALLY DOMINATE THE AREA ON WEDNESDAY BUT AN ISOLATED THUNDERSTORM CAN'T BE RULED OUT PARTICULARLY IN THE MOUNTAINOUS TERRAIN OF CENTRAL VIRGINIA WHERE THE FRONT FROM THE PREVIOUS DAY WILL HAVE LITTLE INFLUENCE ON THE AIR MASS. THURSDAY ANOTHER FRONT WILL APPROACH FROM THE NORTHWEST BUT THIS ONE LOOKS MORE LIKELY TO COMPLETELY STALL OUT BEFORE REACHING THE CWA. IN THE WARMER AND HUMID AIR MASS SOUTH OF THIS FRONT THE POTENTIAL FOR DISORGANIZED CONVECTION WILL PERSIST THROUGH FRIDAY. TEMPERATURES WILL REMAIN QUITE WARM BUT NOT TOO FAR FROM NORMAL FOR MID JUNE. && .AVIATION /08Z SATURDAY THROUGH WEDNESDAY/... PRIMARY CONCERN FOR THIS MORNING IS FOG. SO FAR TONIGHT VSBYS HAVE BEEN VARIABLE WITH ONLY LIMITED DROPS TO IFR. AMOUNT OF MID LEVEL CLOUDS MAY PLAY ROLE INTO HOW FAR VSBYS CAN DROP. IFR MOST LIKELY AT MRB CHO AND IAD. NOT OUT OF THE QUESTION SOME LOW CIGS COULD DEVELOP AS WELL. VSBYS IMPROVE TO VFR 12-14Z. ATTENTION TURNS TO COLD FRONTAL PASSAGE TODAY AND SCATTERED SHOWERS/STORMS. GREATEST COVERAGE MAY BE IN THE DC/BALTIMORE AREA DURING THE MIDDAY TO MID AFTERNOON HOURS...THEN SHIFT SOUTH. BRIEF AVIATION IMPACTS POSSIBLE. LIGHT/VRB WINDS BECOME N AROUND 10 KT MIDDAY. FOR TONIGHT...QUESTION IF CIGS/REDUCED VSBYS DEVELOP...BUT IF SO MRB MAY HAVE GREATEST CHANCE. GENERALLY VFR CIGS AND VIS FROM SUNDAY ON. SLIGHT CHANCE OF SHOWERS OR THUNDERSTORMS LATE SUNDAY INCREASES TO LIKELY LATER MONDAY AND MONDAY EVENING BEFORE DROPPING AGAIN LATER MONDAY NIGHT AND TUESDAY AS A STRONGER COLD FRONT SLIDES INTO THE AREA FROM THE NORTHWEST. BRIEF IFR VIS POSSIBLE IN ANY STORMS DUE TO HEAVY DOWNPOURS. RISK OF THUNDERSTORMS CLOSE TO ZERO WEDNESDAY. && .MARINE... LIGHT AND VARIABLE WINDS THIS MORNING BECOME N 10-15 KT AS A COLD FRONT PUSHES SOUTH TODAY. IF THERE IS ENOUGH OF A PRESSURE SURGE BEHIND THE FRONT...A SCA MAY BE NEEDED...BUT AS OF NOW WINDS LOOK TO BE BELOW THRESHOLD. SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS WILL DEVELOP MID/LATE MORNING NEAR THE NORTHERN BAY...WITH THE SPREADING OVER THE WATERS THROUGH THE AFTERNOON. LOCALLY GUST WINDS POSSIBLE. HIGH PRESSURE PASSES NORTH SATURDAY NIGHT INTO SUNDAY. WINDS BECOME EAST OVERNIGHT...THEN SOUTHEAST SUNDAY 10-15 KT. SCA CONDITIONS POSSIBLE WITH SOUTHERLY CHANNELLING AHEAD OF ANOTHER COLD FRONT ON MONDAY. MOSTLY DRY SUNDAY NIGHT WITH AN INCREASED RISK OF SHOWERS AND THUNDERSTORMS MONDAY AND TUESDAY WITH THE AFOREMENTIONED FRONT. AFTER A MOSTLY DRY WEDNESDAY THE RISK OF THUNDERSTORMS MAY AGAIN INCREASE THURSDAY. && .LWX WATCHES/WARNINGS/ADVISORIES... DC...NONE. MD...NONE. VA...NONE. WV...NONE. MARINE...NONE. && SYNOPSIS...RCM NEAR TERM...ADS SHORT TERM...ADS/RCM LONG TERM...RCM AVIATION...ADS/RCM MARINE...ADS/RCM
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 458 AM EDT SAT JUN 6 2015 ANZ530>543-DCZ001-MDZ011-013-014-016>018-508-VAZ052>057-061600- CHESAPEAKE BAY NORTH OF POOLES ISLAND MD- CHESAPEAKE BAY FROM POOLES ISLAND TO SANDY POINT MD- CHESAPEAKE BAY FROM SANDY POINT TO NORTH BEACH MD- CHESAPEAKE BAY FROM NORTH BEACH TO DRUM POINT MD- CHESAPEAKE BAY FROM DRUM POINT MD TO SMITH POINT VA- TIDAL POTOMAC FROM KEY BRIDGE TO INDIAN HEAD MD- TIDAL POTOMAC FROM INDIAN HEAD TO COBB ISLAND MD- TIDAL POTOMAC FROM COBB ISLAND MD TO SMITH POINT VA- PATAPSCO RIVER INCLUDING BALTIMORE HARBOR- CHESTER RIVER TO QUEENSTOWN MD-EASTERN BAY- CHOPTANK RIVER TO CAMBRIDGE MD AND THE LITTLE CHOPTANK RIVER- PATUXENT RIVER TO BROOMES ISLAND MD- TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH ISLAND-DISTRICT OF COLUMBIA-SOUTHERN BALTIMORE-PRINCE GEORGES- ANNE ARUNDEL-CHARLES-ST. MARYS-CALVERT-SOUTHEAST HARFORD- PRINCE WILLIAM/MANASSAS/MANASSAS PARK-FAIRFAX- ARLINGTON/FALLS CHURCH/ALEXANDRIA-STAFFORD-SPOTSYLVANIA- KING GEORGE- 458 AM EDT SAT JUN 6 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE MARYLAND PORTION OF THE CHESAPEAKE BAY...TIDAL POTOMAC RIVER...AND ADJACENT COUNTIES IN CENTRAL MARYLAND AND NORTHERN VIRGINIA AS WELL AS THE DISTRICT OF COLUMBIA. .DAY ONE...TODAY AND TONIGHT NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. MDZ003>006-501>507-VAZ025>031-036>040-050-051-501>508-WVZ050>053- 055-501>506-061600- WASHINGTON-FREDERICK-CARROLL-NORTHERN BALTIMORE- EXTREME WESTERN ALLEGANY-CENTRAL AND EASTERN ALLEGANY- NORTHWEST MONTGOMERY-CENTRAL AND SOUTHEAST MONTGOMERY- NORTHWEST HOWARD-CENTRAL AND SOUTHEAST HOWARD-NORTHWEST HARFORD- AUGUSTA-ROCKINGHAM-SHENANDOAH-PAGE-WARREN-CLARKE-NELSON-ALBEMARLE- GREENE-MADISON-RAPPAHANNOCK-ORANGE-CULPEPER-NORTHERN FAUQUIER- SOUTHERN FAUQUIER-WESTERN HIGHLAND-EASTERN HIGHLAND- WESTERN LOUDOUN-EASTERN LOUDOUN-NORTHERN VA BLUE RIDGE- CENTRAL VA BLUE RIDGE-HAMPSHIRE-MORGAN-BERKELEY-JEFFERSON-HARDY- WESTERN GRANT-EASTERN GRANT-WESTERN MINERAL-EASTERN MINERAL- WESTERN PENDLETON-EASTERN PENDLETON- 458 AM EDT SAT JUN 6 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN WEST VIRGINIA... NORTHERN AND CENTRAL VIRGINIA...AND CENTRAL AND WESTERN MARYLAND WITH THE EXCEPTION OF GARRETT COUNTY. .DAY ONE...TODAY AND TONIGHT NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.
The national radar mosaic for the moment the first event began.
2 dense fog. Local standard time, as filed.
Visibilities of one quarter mile or less was reported at 8W2 and SHD.
Visibilities of one quarter mile or less was reported at 8W2 and SHD.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Virginia in 2015Every state in 2015This day in weather historyWarnings in Virginia, June 2015
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 584989, 584990.