The eastern half of the United States was under cyclonic flow and moisture from the Atlantic and Gulf continued to move into the Mid Atlantic. A warm front moved northward and showers and thunderstorms broke out across the area.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS LWX wrote it up.
The eastern half of the United States was under cyclonic flow and moisture from the Atlantic and Gulf continued to move into the Mid Atlantic. A warm front moved northward and showers and thunderstorms broke out across the area. Heavy rain produced flash flooding and rapid rises on streams and creeks.
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 Apr 30, 8:55 AM EST, 35 minutes earlier.
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
955 AM EDT WED APR 30 2014
.SYNOPSIS...
A WARM FRONT WILL GRADUALLY LIFT TO THE NORTH TODAY. A COLD FRONT
WILL THEN MOVE ACROSS THE AREA LATE TONIGHT INTO THURSDAY MORNING.
HIGH PRESSURE BUILDS IN FOR FRIDAY. A WEAK COLD FRONT MAY MOVE
THROUGH SATURDAY.
&&
.NEAR TERM /THROUGH TONIGHT/...
CUTOFF LOW PRESSURE OVER THE NORTHERN PLAINS WILL CONTINUE TO
SLOWLY DRIFT INTO THE WESTERN GREAT LAKES THROUGH TONIGHT. THE
WARM FRONT ASSOCIATED WITH THE LOW DIPS SOUTHEAST INTO WESTERN
NORTH CAROLINA THIS MORNING. THE BOUNDARY EXTENDS NORTHEAST INTO
SOUTHERN MARYLAND. THE COLD FRONT ASSOCIATED WITH THE LOW EXTENDS
SOUTH INTO THE TENNESSEE VALLEY THIS MORNING.
TROPICAL AIR CONTINUES TO OVERRUN THE SURFACE COOL AIR IN
PLACE...RESULTING IN RAIN THIS MORNING. THE HEAVIEST RAIN WILL BE
NEAR AND EAST OF THE BLUE RIDGE WHERE THE MOISTURE IS DEEPEST AND
ELEVATED INSTABILITY IS CAUSING CONVECTION. HEAVY RAINFALL WITH
RAINFALL RATES OVER ONE INCH PER HOUR ARE EXPECTED ACROSS THESE
AREAS DURING THIS TIME.
THE WARM FRONT WILL CONTINUE TO SLOWLY PUSH NORTH AND WEST INTO
OUR AREA THIS AFTERNOON. THE MARINE LAYER MAY HOLD ON A BIT LONGER
THAN WHAT GUIDANCE IS SUGGESTING DUE TO THE FACT THAT THE MARINE
LAYER IS DEEPER ON THE 12Z KIAD RAOB COMPARED TO WHAT THE MODELS
WERE FORECASTING FOR THAT TIME. HAVING THAT BEEN SAID...THE
BOUNDARY SHOULD STILL LIFT NORTH THROUGH MOST OF OUR AREA THIS
AFTERNOON...PUTTING THE WARM SECTOR OVERHEAD. THERE SHOULD BE
ENOUGH DESTABALIZATION IN THE WARM SECTOR FOR AROUND 300-600 J/KG
OF MLCAPE TO DEVELOP...DESPITE THE CLOUD COVER. SHEAR PROFILES
REMAIN QUITE FAVORABLE FOR SEVERE THUNDERSTORMS WITH THE PRIMARY
THREATS BEING DAMAGING WIND GUSTS AND ISOLATED TORNADOES. THE MAIN
UNCERTAINTY IS WHETHER OR NOT STORMS CAN GET ROOTED WITHIN THE
BOUNDARY LAYER...AND THAT IS LIKELY IN THE WARM SECTOR THIS
AFTERNOON AND EVENING. SINCE THE MARINE AIR MAY TAKE A BIT LONGER
TO MIX OUT...THE BEST CHANCE FOR SEVERE THUNDERSTORMS WILL BE
LATER THIS AFTERNOON AND TONIGHT. THE STABLE LAYER MAY BE A BIT
STRONGER NEAR THE MASON-DIXON LINE TOWARD THE WESTERN SHORE OF THE
MARYLAND CHESAPEAKE BAY...SO UNCERTAINTY FOR SEVERE WEATHER ACROSS
THESE AREAS IS A BIT HIGHER.
PWATS WILL BE NEAR RECORD LEVELS THIS AFTERNOON...SO SHOWERS AND
THUNDERSTORMS WILL PRODUCE HEAVY RAINFALL. SHOWERS AND
THUNDERSTORMS HAVE THE POTENTIAL TO TRAIN OVER THE SAME AREAS AS
WELL...CAUSING VERY HEAVY AMOUNTS OF RAIN IN A SHORT PERIOD OF
TIME. THE FLASH FLOOD WARNING REMAINS IN EFFECT FOR THE AREA.
THE COLD FRONT ASSOCIATED WITH THE LOW WILL MOVE INTO THE POTOMAC
HIGHLANDS THIS EVENING BEFORE APPROACHING THE I-95 CORRIDOR
OVERNIGHT. MORE SHOWERS AND THUNDERSTORMS ARE EXPECTED ALONG WITH
HEAVY RAIN AND THE THREAT FOR SEVERE WEATHER. THE BEST CHANCE FOR
HEAVY SHOWERS AND THUNDERSTORMS WILL BE THIS EVENING WEST OF THE
BLUE RIDGE MOUNTAINS...AND THROUGH TONIGHT EAST OF THE BLUE RIDGE
MOUNTAINS.
&&
.SHORT TERM /THURSDAY THROUGH FRIDAY/...
COLD FRONT WILL MOVE EAST OF THE CWA AND OFFSHORE THURSDAY MORNING.
MUCH OF THE THUNDERSTORM ACTIVITY WILL LIKELY HAVE ALSO PUSHED TO
THE EAST BY 12Z...BUT THERE MAY BE SOME LINGERING SHOWERS NEAR THE
BOUNDARY TO START THE DAY. WIND SHIFT BEHIND THE FRONT WILL BEGIN TO
BRING DRIER AIR IN FOR THE AFTERNOON AND IT/S POSSIBLE THAT CLOUDS
BREAK FOR SOME SUNSHINE IN THE AFTERNOON. BOTH DOWNSLOPING WIND AND
SOME SUNSHINE WILL CONTRIBUTE TO A WARM DAY WITH MAXIMA LIKELY WELL
INTO THE 70S /EXCEPT FOR THE HIGHER ELEVATIONS/RIDGES/.
SOMEWHAT COOLER PUSH COMES IN THURSDAY NIGHT INTO FRIDAY...ALTHOUGH
AIR MASS ISN/T REALLY ALL THAT COOL AND TEMPERATURES ARE EXPECTED TO
BE NEAR CLIMO TO END THE WEEK.
&&
.LONG TERM /FRIDAY NIGHT THROUGH TUESDAY/...
A COUPLE OF WEAK SHORTWAVES/COLD FRONTS LOOK TO SWING THROUGH
SATURDAY AND SUNDAY...BUT GIVEN RELATIVELY DRY AIR IN PLACE LITTLE
IMPACT IS EXPECTED. RAIN CHANCES WILL PRIMARILY BE OVER THE
HIGHLANDS...WITH PERIODS OF CLOUDS AS THE SHORTWAVES MOVE BY AND
TEMPERATURES HELD AROUND CLIMO.
WEAK HIGH PRESSURE WILL BUILD IN FROM THE NORTH EARLY NEXT WEEK WITH
A CONTINUATION OF NEAR AVERAGE TEMPERATURES.
&&
.AVIATION /13Z WEDNESDAY THROUGH SUNDAY/...
IFR CONDITIONS WILL CONTINUE INTO THIS AFTERNOON ALONG WITH
LOCALLY HEAVY SHOWERS AND THUNDERSTORMS. MVFR/IFR CONDITIONS ARE
EXPECTED THIS AFTERNOON AND TONIGHT ALONG WITH MORE SHOWERS AND
THUNDERSTORMS AHEAD OF A COLD FRONT. SEVERE THUNDERSTORMS ARE
POSSIBLE DURING THIS TIME...WITH LOCALLY DAMAGING WIND GUSTS AND
ISOLATED TORNADOES BEING THE PRIMARY THREATS. LOW-LEVEL WIND SHEAR
IS EXPECTED INTO EARLY THIS AFTERNOON WITH SOUTH-SOUTHEAST WINDS
AROUND 40 TO 45 KNOTS JUST A COUPLE THOUSAND FEET FROM THE
SURFACE. THE GUSTY WINDS WILL REMAIN ALOFT THROUGH MOST OF
TONIGHT...BUT SURFACE WINDS WILL ALSO BECOME SOUTHEAST SO LOW-
LEVEL WIND SHEAR REMAINS OUT OF THE TAFS DURING THIS TIME...EXCEPT
FOR KMRB WHERE THE MARINE LAYER MAY TAKE LONGER TO MIX OUT.
MVFR/IFR CONDITIONS MAY LINGER THROUGH 12Z-15Z THURSDAY...OTHERWISE
AS DRIER AIR MOVES IN BEHIND A COLD FRONT EXPECT IMPROVING
CONDITIONS FOR THE BALANCE OF THE DAY WITH NORTHWEST WINDS 10-15 KT.
NO SIGNIFICANT WEATHER IS EXPECTED FRIDAY INTO THE BULK OF THE
WEEKEND.
&&
.MARINE...
A GALE WARNING IS IN EFFECT FOR THE MARYLAND CHESAPEAKE BAY FROM
SANDY POINT TO SMITH POINT...AND FOR THE TIDAL POTOMAC RIVER FROM
COBB ISLAND TO SMITH POINT. A SMALL CRAFT ADVISORY IS IN EFFECT
FOR THE REST OF THE WATERS THROUGH TONIGHT.
A WARM FRONT WILL PASS THROUGH THE WATERS THIS AFTERNOON. EAST-
NORTHEAST WINDS AHEAD OF THE BOUNDARY WILL SHIFT TO THE SOUTH-
SOUTHEAST BEHIND IT. SHOWERS AND THUNDERSTORMS ARE EXPECTED
THROUGH TONIGHT...WITH LOCALLY HEAVY RAIN EXPECTED. SEVERE
THUNDERSTORMS ARE POSSIBLE THIS AFTERNOON AND TONIGHT WITH LOCALLY
DAMAGING WIND GUSTS AND ISOLATED WATERSPOUTS BEING THE PRIMARY
THREATS.
AS WINDS TURN TO THE NORTHWEST BEHIND A COLD FRONT THURSDAY
MORNING...SCA CONDITIONS MAY OCCUR OVER A PORTION OF THE
WATERS...PARTICULARLY THE LOWER TIDAL POTOMAC AND DOWN THE MAIN
CHANNEL OF THE CHESAPEAKE BAY. WILL HAVE TO WATCH FRIDAY AFTERNOON
FOR MARGINAL SCA CONDITIONS AS WELL...OTHERWISE AT THIS TIME WINDS
LOOK TO BE BELOW SCA THRESHOLDS INTO THE WEEKEND.
&&
.HYDROLOGY...
WAVES OF TROPICAL SHOWERS/TSTMS CONTINUE TO FUNNEL ACROSS THE AREA.
AFTER A SVRL HR RESPITE...PCPN FILLING BACK IN ATTM. ON AVG...RAFL
TTLS THRU 13 UTC UNDER ARE ESTIMATED TO BE BETWEEN 2 AND 3 INCHES
BASED ON GROUND REPORTS AND THE RADAR ESTIMATE.
WARM AND MOIST AIR CONTINUE TO MOVE INTO THE AREA. THE 12Z KIAD
RAOB SHOWS A 1.60 PWAT...WHICH IS WELL OVER TWO STANDARD
DEVIATIONS ABOVE CLIMO. HIRES MODELS AND THE LATEST OPERATIONAL
GFS/NAM SHOW THE POTENTIAL FOR ADDTL WIDESPREAD 2-4 INCHES WITH
THE LEAST EXPECTED WEST OF THE BLUE RIDGE AND THE MOST SOMEWHERE
BETWEEN THE BLUE RIDGE AND I-95 CORRIDOR.
FLASH FLOOD WATCH REMAINS IN EFFECT AREA WIDE...AND RIVER FLOOD
WATCHES ARE IN EFFECT AT EIGHT FORECAST POINTS. IN TERMS OF FLASH
FLOODING...SHRA/TSRA PAST 24 HRS SETTING THE STAGE FOR A LKLY ACTIVE
DAY-EVNG AHD. NUMEROUS RIVER FLOOD WARNINGS ARE IN EFFECT AND A
RIVER FLOOD WATCH REMAINS IN EFFECT FOR THE SHENANDOAH AND POTOMAC
RIVER BASINS. CONTINUE TO MONITOR THE LATEST
FORECASTS...DISCUSSIONS...AND POTENTIAL WARNINGS.
&&
.TIDES/COASTAL FLOODING...
A COASTAL FLOOD WARNING CONTINUES UNTIL 1 PM FOR THE WESTERN SHORE
OF THE CHEASAPEAKE BAY FROM SOUTHERN BALTIMORE TO ST MARYS
COUNTIES...AND ALSO FOR WASHINGTON DC ALONG THE UPPER TIDAL
POTOMAC RIVER. A COASTAL FLOOD ADVISORY IS IN EFFECT UNTIL 1 PM
FOR THE REST OF THE TIDAL POTOMAC RIVER. TIDAL ANOMALIES WILL
CONTINUE TO INCREAST TODAY AS THE FLOW TURNS TOWARD THE SOUTHEAST.
THE PM TIDE TDA IS THE LOWER ASTRONOMICALLY...BY UP TO 3/4 FT. THAT
MAY BE BALANCED OUT BY INCREASING DEPARTURES...BUT AM UNSURE TO WHAT
EXTENT. THE THU MRNG TIDE CYCLE LOOKING TO BE THE HIGHEST OF THEM
ALL SINCE ASTRO TIDES AND STORM TIDE WL COINCIDE. THAT CYCLE STANDS
THE BEST CHANCE TO ACHIEVE MDT TIDAL FLOODING. SINCE THE DECISION
HAS BEEN MADE FOR CYCLE 1 /TODAY/ AND THERES SOME UNCERTAINTY
WHETHER CYCLE 2 /TONIGHT/ WL BE A HIGH MINOR OR A LOW-END
MODERATE...WILL LEAVE WATCH ALONE FOR TONIGHT AND TOMORROW. AS
ALREADY MENTIONED...BE ADVISED THAT THE THU MORNING TIDE WILL LIKELY
BE THE HIGHEST.
LOGIC FOR THE BAY ADDRESSES THE RIVER TOO. RISK OF MODERATE TIDAL
FLOODING NOT AS HIGH AS ON THE BAY...BUT ITS LOOKING LIKE SOLID
MINOR FLOODING EACH OF THE NEXT 3 HIGH TIDE CYCLES. WILL EXTEND
ADVYS TO COVER THROUGH THU MORNING. IF LATER GDNC SUGGESTS MDT
FLOODING MORE LKLY...WL UPGRADE AS NEEDED.
FRESHWATER FROM HEAVY RAINFALL WILL DRAIN THROUGH THE RIVER SYSTEM
AND REACH WASHINGTON DC SOMETIME LATE THU NIGHT OR FRI...RESULTING
IN ADDTL FLOODING FROM FRESHWATER SOURCES.
&&
.LWX WATCHES/WARNINGS/ADVISORIES...
DC...FLASH FLOOD WATCH THROUGH LATE TONIGHT FOR DCZ001.
COASTAL FLOOD WARNING UNTIL 1 PM EDT THIS AFTERNOON FOR DCZ001.
COASTAL FLOOD WATCH FROM 1 PM EDT THIS AFTERNOON THROUGH
THURSDAY MORNING FOR DCZ001.
MD...FLASH FLOOD WATCH THROUGH THIS EVENING FOR MDZ003-004-501-502.
FLASH FLOOD WATCH THROUGH LATE TONIGHT FOR MDZ005>007-009>011-
013-014-016>018.
COASTAL FLOOD ADVISORY UNTIL NOON EDT THURSDAY FOR MDZ013-016.
COASTAL FLOOD WARNING UNTIL 1 PM EDT THIS AFTERNOON FOR MDZ011-
014-017-018.
COASTAL FLOOD WATCH FROM 1 PM EDT THIS AFTERNOON THROUGH
THURSDAY MORNING FOR MDZ007-011-014-017-018.
COASTAL FLOOD ADVISORY UNTIL 1 PM EDT THIS AFTERNOON FOR
MDZ007.
VA...FLASH FLOOD WATCH THROUGH THIS EVENING FOR VAZ025>031-036>040-
042-050-051-501-503-504.
FLASH FLOOD WATCH THROUGH LATE TONIGHT FOR VAZ052>057-502.
COASTAL FLOOD ADVISORY UNTIL NOON EDT THURSDAY FOR VAZ052>055-
057.
WV...FLASH FLOOD WATCH THROUGH THIS EVENING FOR WVZ050>053-055-
501>506.
MARINE...GALE WARNING UNTIL 6 AM EDT THURSDAY FOR ANZ532>534-537-
540>543.
SMALL CRAFT ADVISORY UNTIL 6 AM EDT THURSDAY FOR ANZ530-531-
535-536-538-539.
&&
SYNOPSIS...BPP
NEAR TERM...HAS
SHORT TERM...BPP
LONG TERM...BPP
AVIATION...BPP/HAS
MARINE...BPP/HAS
HYDROLOGY...BJL/HTS/JRK//JE
TIDES/COASTAL FLOODING...BJL/HTSHAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 955 AM EDT WED APR 30 2014 ANZ530>543-DCZ001-MDZ006-007-011-013-014-016>018-VAZ052>057- 011000- 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-NORTHERN BALTIMORE-HARFORD- SOUTHERN BALTIMORE-PRINCE GEORGES-ANNE ARUNDEL-CHARLES-ST. MARYS- CALVERT-PRINCE WILLIAM/MANASSAS/MANASSAS PARK-FAIRFAX- ARLINGTON/FALLS CHURCH/ALEXANDRIA-STAFFORD-SPOTSYLVANIA- KING GEORGE- 955 AM EDT WED APR 30 2014 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 NUMEROUS FLOOD WARNINGS ARE IN EFFECT FOR THE AREA NEAR AND WEST OF INTERSTATE 95. A FLASH FLOOD WATCH IS IN EFFECT THROUGH TONIGHT. SOME THUNDERSTORMS THIS AFTERNOON AND TONIGHT WILL BE CAPABLE OF PRODUCING DAMAGING WIND GUSTS AND ISOLATED TORNADOES. ON THE WESTERN SHORE OF THE CHESAPEAKE BAY FROM SOUTHERN BALTIMORE THROUGH ST MARYS COUNTIES AND FOR WASHINGTON DC ALONG THE UPPER TIDAL POTOMAC RIVER...A COASTAL FLOOD WARNING IS IN EFFECT UNTIL 1 PM THIS AFTERNOON. A COASTAL FLOOD ADVISORY IS IN EFFECT FOR HARFORD COUNTY UNTIL 1 PM THIS AFTERNOON. A COASTAL FLOOD WATCH IS IN EFFECT FOR THESE AREAS LATER THIS AFTERNOON THROUGH TONIGHT. ALONG THE REST OF THE TIDAL POTOMAC RIVER...A COASTAL FLOOD ADVISORY IS IN EFFECT THROUGH TONIGHT. A GALE WARNING IS IN EFFECT THROUGH TONIGHT FOR THE MARYLAND CHESAPEAKE BAY FROM SMITH POINT TO NORTH BEACH AND FOR THE LOWER TIDAL POTOMAC RIVER WHILE A SMALL CRAFT ADVISORY IS IN EFFECT FOR THE REMAINDER OF THE MARYLAND CHESAPEAKE BAY AND TIDAL POTOMAC RIVER THROUGH TONIGHT. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY A COASTAL FLOOD WATCH REMAINS IN EFFECT ALONG THE WESTERN SHORE OF THE CHESAPEAKE BAY AND WASHINGTON DC ALONG THE UPPER TIDAL POTOMAC RIVER THURSDAY MORNING...WHILE A COASTAL FLOOD ADVISORY REMAINS IN EFFECT ALONG THE REST OF THE TIDAL POTOMAC RIVER. FRESHWATER FROM HEAVY RAINFALL MAY CAUSE MINOR TO MODERATE FLOODING ALONG THE TIDAL POTOMAC RIVER NEAR WASHINGTON DC BY FRIDAY. RIVER FLOOD WATCHES ARE IN EFFECT ALONG THE POTOMAC RIVER BASIN. A SMALL CRAFT ADVISORY MAY BE NEEDED FOR PORTIONS OF THE WATERS THURSDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE REQUIRED THIS AFTERNOON AND TONIGHT. ALSO PLEASE REPORT ANY FLOODING TO THE NATIONAL WEATHER SERVICE. MDZ003>005-009-010-501-502-VAZ025>031-036>040-042-050-051-501>504- WVZ050>053-055-501>506-011000- WASHINGTON-FREDERICK MD-CARROLL-MONTGOMERY-HOWARD- EXTREME WESTERN ALLEGANY-CENTRAL AND EASTERN ALLEGANY-AUGUSTA- ROCKINGHAM-SHENANDOAH-FREDERICK VA-PAGE-WARREN-CLARKE-NELSON- ALBEMARLE-GREENE-MADISON-RAPPAHANNOCK-LOUDOUN-ORANGE-CULPEPER- NORTHERN FAUQUIER-SOUTHERN FAUQUIER-WESTERN HIGHLAND- EASTERN HIGHLAND-HAMPSHIRE-MORGAN-BERKELEY-JEFFERSON-HARDY- WESTERN GRANT-EASTERN GRANT-WESTERN MINERAL-EASTERN MINERAL- WESTERN PENDLETON-EASTERN PENDLETON- 955 AM EDT WED APR 30 2014 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 NUMEROUS FLOOD WARNINGS ARE IN EFFECT FOR LOCATIONS EAST OF THE BLUE RIDGE MOUNTAINS. A FLASH FLOOD WATCH IS IN EFFECT THROUGH THIS EVENING. SOME THUNDERSTORMS THIS AFTERNOON AND EVENING WILL BE CAPABLE OF PRODUCING DAMAGING WIND GUSTS AND ISOLATED TORNADOES. NUMEROUS RIVER FLOOD WARNINGS ARE IN EFFECT. RIVER FLOOD WATCHES REMAIN IN EFFECT FOR THE POTOMAC AND SHENANDOAH RIVER BASINS. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY NUMEROUS RIVER FLOOD WARNINGS ARE IN EFFECT. RIVER FLOOD WATCHES REMAIN IN EFFECT FOR THE POTOMAC AND SHENANDOAH RIVER BASINS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE REQUIRED THIS AFTERNOON AND EVENING. ALSO PLEASE REPORT ANY FLOODING TO THE NATIONAL WEATHER SERVICE.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
847 AM EDT WED APR 30 2014
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0837 AM COASTAL FLOOD MIDDLE RIVER 39.30N 76.37W
04/30/2014 BALTIMORE MD PUBLIC
FLOODING ON BAY STREET AT BOWLEY BAR. WATER IS REPORTED
AS 3 FEET OVER FLOOD STAGE... COVERING PIERS AND
REACHING PROPERTIES.
&&
EVENT NUMBER LWX1400089
KCSPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
921 AM EDT WED APR 30 2014
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0425 AM COASTAL FLOOD COBB ISLAND 38.26N 76.84W
04/30/2014 CHARLES MD DEPT OF HIGHWAYS
COBB ISLAND ROAD WAS REPORTED FLOODED AND CLOSED.
&&
EVENT NUMBER LWX1400090
JEPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1004 AM EDT WED APR 30 2014
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0950 AM FLOOD 3 NNW WOOLSEY 38.91N 77.67W
04/30/2014 FAUQUIER VA TRAINED SPOTTER
APPROX 6 INCHES OF WATER RUSHING OVER ROADWAY NEAR
CORNER OF LOGMILL RD AND RT 15
&&
EVENT NUMBER LWX1400091
CBPRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1009 AM EDT WED APR 30 2014
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0950 AM FLOOD 2 N WOOLSEY 38.90N 77.63W
04/30/2014 PRINCE WILLIAM VA TRAINED SPOTTER
APPROX 6 INCHES OF WATER RUSHING OVER ROADWAY NEAR
CORNER OF LOGMILL RD AND RT 15
&&
CORRECTED COUNTY/STATE...LOCATION
EVENT NUMBER LWX1400091
CBPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1019 AM EDT WED APR 30 2014
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0907 AM COASTAL FLOOD 2 S MOUNT VERNON 38.69N 77.10W
04/30/2014 CHARLES MD TRAINED SPOTTER
PUBLIC DOCK SUBMERGED.
&&
EVENT NUMBER LWX1400092
STRONGThe Sterling radar (KLWX), 78 km away, was scanning. The volume nearest the first event began at 14:32 UTC.
36 flood, 18 flash flood. Local standard time, as filed.
Backwater from Holly Creek flooded Nursery Road between Patapsco Road and Route 648.
Maryland Route 176 flooded and closed between Central Avenue and Baltimore Annapolis Boulevard.
There was two feet of slowly flowing water over Governor Bridge Road. There was a car stalled in it with Occupant.
South Entrance Road was flooded and closed at the Little Patuxent River.
The stream gauge on Big Pipe Creek at Bruceville exceeded its flood stage of 8 feet. Keysville-Bruceville Road began to flood. This event peaked at 14.59 feet.
Shaffersville Road was flooded between Shaffers Mill Road and Florence Road.
Shaffersville Road was flooded north of Shaffers Mill Road.
The stream gauge on Gunpowder Falls at Glencoe exceeded its flood stage of 7 feet. Portions of the NC RR Trail began to flood near Glencoe.
The stream gauge on the Little Patuxent River exceeded the flood stage of 10 feet. Laurel-Fort Mead Road was covered by water.
Bradley Road was closed at the intersection with Fernwood Road due to flooding.
The stream gauge on Turkey Branch near Rockville rose five feet in fifteen minutes quickly exceeding flood stage and flooding area roadways. The stream then fell below flood stage but flooded twice more during the afternoon as more heavy rain affected the area.
Route 355 was flooded and closed at Bennett Creek.
The stream gauge on Turkey Branch near Rockville rose five feet in fifteen minutes quickly exceeding flood stage and flooding area roadways. The stream then fell below flood stage but flooded twice more during the afternoon as more heavy rain affected the area.
There were numerous road closures north of the city o Frederick Maryland due to high water.
Sams Creek Road was closed due to high water between Oak Orchard Road and Route 31.
There was a water rescue due to high water at intersection of Bradley Boulevard and Fallen Oak Drive.
The stream gauge on the NW Branch Anacostia River at Colesville exceeded its flood stage of 9 feet. Water covered the old bridge over northwest branch at Old Randolph Road. This event peaked at 10.68 feet.
The Middle Patuxent river rose three and a half feet in less than an hour. Old Columbia road was flooded.
The Patapsco River gauge in Elkridge at the Patapsco Valley State Park exceeded flood stage of 15 feet. Water approached structures near Patpapsco Valley State Park.
There were several water rescues in the county such as of Burning Tree Road and Melody Lane in Bethesda.
The stream gauge on the Monocacy River at Bridgeport eceeded the 13 foot flood stage. Nearby roads were flooded. Baptist Road near Bridgeport Road began to flood. This event peaked at 14.59 feet.
There were numerous road closures reported within the county including water from the Middle Patuxent River flowing over Carroll Mill Road.
The stream gauge on the Patapsco River at Catonsville exceeded its flood stage of 20 feet. River Road began to flood.
The stream gauge on Beaverdam Run at Cockeysville exceeded its flood stage of 9 feet. Nearby roads were closed. Flooding became widespread near the intersection of York Road and Beaver Run Road with numerous buildings flooded and water flowing across York Road. This event peaked at 10.94 feet.
There was water flowing across the road near the intersection of Papermill Road and Allison Road.
There was water about 2 inches deep flowing across the road near 2838 Paper Mill Road.
There was one to two inches of water flowing across Paper Mill Road near Hunt Valley Inn Golf Course. The Golf Course was also flooded.
Falling Branch Road and Red Bridge Road was closed due to flowing water from Falling Branch.
The stream gauge on Whitemarsh Run in White Marsh exceeded the flood stage of 10 feet. Town Center Court began to flood. This event peaked at 13.27 feet.
There was a high water rescue on a underpass of Interstate 495.
There were several inches of flowing water over Paper Mill Road from Western Run.
Jones Falls was out of its banks. There was flooded reported at the Mount Washington Mill Complex and water moving across Clipper Mill Road. Water covered almost all of the pedestrian bridge paralleling Water Street, and covered Water Street from the MD 4 Westbound exit ramps to Judges Street.
The stream gauge on Western Branch at Upper Marlboro exceeded its flood stage and there was flooding on Water Street.
There was a stream gauge on the Patuxent River at Unity exceeded flood stage of 8 feet which flooded a nearby parking area and caused significant inflow above Brighton Dam which led to further flooding downstream.
The stream gauge at Patapsco River in Hollofield reached flood stage. This event peaked at 12.33 feet. At 11 feet, water covers the bridge at Hollofield Road and it crosses the railroad tracks in spots.
York Road flooded at Beaver Run.
Paper Mill Road was flooded with at least six inches of water flowing across it between Popular Hill Road and Phoenix Road.
The stream gauge on Hawlings River near Sandy Spring exceeded flood stage flooding nearby roadways. The stream crested during the early evening hours.
The stream gauge on Gwynns Falls at Villa NOVA exceeded flood stage of 11 feet flooding nearby roadways. The stream rose two feet in an hour around the time it exceeded flood stage.
The stream gauge on Hawlings River at Sandy Spring exceeded the flood stage of 6.5 feet. Nearby roads were flooded.
The stream gauge at Gwynns Falls in Baltimore reached flood stage. This event peaked at 15.68 feet. At 13 feet, water covers the bike path alongside the stream and approaches the end of Berlin Street.
Maple Avenue was closed near Deep Run due to flooding.
There was a small landslide the closed eastbound US 40 in Patapsco State Park near the Baltimore County Line.
The stream gauge at Little Patuxent in Guilford reached flood stage. This event peaked at 14.02 feet. At 13 feet, water approaches the very end of Owen Brown Road. At 12 feet, water covers the bridge at South Entrance Road. Several trail bridges also begin to flood.
There was a landslide near North Charles St and East 26th Street.
The stream gauge on the Patuxent River below Brighton Dam exceeded its flood stage of 9 feet. Roads below the Dam were flooded. Havilland Mill Road began to flood.
The stream gauge at Little Gunpowder in Laurel Brook reached flood stage. This event peaked at 8.74 feet. At 8 feet, portions of Guyton Road began to flood.
Baptist Church Road was flooded near John Wayne Court.
Beach Drive was closed in both directions at Connecticut Avenue. Water was estimated two to three feet deep.
New Hampshire Ave was closed between Brighton Knolls Drive and Gold Mine Road.
Governors Bridge Road was closed due to flooding.
Water Street was closed due to flooding.
The stream gauge at the Northeast branch of the Anacostia in Riverdale reached flood stage. This event peaked at 8 feet. At 8 feet, the Northeast Branch trail begins to flood in spots.
The stream gauge at Patuxent River in Laurel reached flood stage. This event peaked at 14.72 feet. At 13 feet, the parking lot of a car dealership in Laurel begins to flood. At 10.5 feet, the MARC commuter lot near Laurel begins to flood.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Maryland in 2014Every state in 2014This day in weather historyWarnings in Maryland, April 2014
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: 513627, 513628, 513629, 513630, 513631, 513633, 513634, 513635, 513636, 513641, 511468, 513946, 511469, 513947, 513948, 513949, 513950, 511477, 513951, 511495, 513953, 511482, 513955, 513957, 513956, 513958, 513959, 511496, 513960, 511483, 512002, 512003, 513961, 511486, 515042, 513962, 512004, 511488, 511959, 513964, and more.