Hail, Anne Arundel
- When
- August 18, 3:50 PM EST
- Where
- Anne Arundel County, 0.94 mi SSW of Pioneer City
- Measured
- 1 in hail
- Reported by
- COOP Observer
- Coordinates
- 39.118, -76.729
Quarter sized hail was reported in Fort Meade.
Hail and Damaging Winds in Maryland, August 18, 2011
A southerly flow around high pressure off the east coast produced hot and humid conditions. The hot and humid conditions combined with colder air aloft associated with an upper-level trough to produce moderate amounts of instability.
Where it happened
Every event with a place to put it. Tap one for its entry below.
- Tornadoes
- Tropical storms and surge
- Floods
- Wind
- Hail
- Winter weather
- Heat and drought
- Cold
- Fire, smoke and dust
- Marine and coastal
- Other
The toll
- Deaths
- 0
- Injuries
- 1
- Property damage
- $28,000
- Crop damage
- None recorded
- Events
- 38
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.
What happened
The episode as NWS LWX wrote it up.
A southerly flow around high pressure off the east coast produced hot and humid conditions. The hot and humid conditions combined with colder air aloft associated with an upper-level trough to produce moderate amounts of instability. Some thunderstorms that developed produced damaging wind gusts and large hail.
What forecasters said that day
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 Aug 18, 2:30 PM EST, 1 hour 20 minutes earlier.
Area forecast discussion, Aug 18, 2:30 PM EST, 1 hour 20 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
330 PM EDT THU AUG 18 2011
.SYNOPSIS...
AN UPPER-LEVEL TROUGH WILL REMAIN IN PLACE THROUGH SATURDAY WHILE
DISTURBANCES ROTATE AROUND THIS SYSTEM...BRINGING UNSETTLED
CONDITIONS. A COLD FRONT WILL CROSS THE REGION SUNDAY AND MONDAY
BEFORE HIGH PRESSURE RETURNS ON TUESDAY.
&&
.NEAR TERM /THROUGH FRIDAY/...
A LINE OF ISOLATED CONVECTION DEVELOPED IN THE LEE OF THE BLUE
RIDGE JUST AFTER 1PM AND IS DRIFTING SLOWLY EWD. NEAR-TERM
GUIDANCE SUGGESTS THESE CELLS WILL STAY FAIRLY ISOLATED. THIS
CREATES THE POTENTIAL FOR A COUPLE OF THESE STORMS TO BECOME
RELATIVELY STRONG/SEVERE. STORMS MAY BECOME CLUSTERED ALONG
OUTFLOW BOUNDARIES AS THE AFTN/EVE WEARS ON. AFTER THIS INITIAL
BAND OF CONVECTION...THEY MAY BE ONLY A HANDFUL OF SHOWERS/TSTMS
DEVELOPING ACROSS THE AREA.
CLEARING SKIES SINCE LATE MRNG HAVE ALLOWED INSTABILITY TO INCREASE
QUICKLY...ESPECIALLY IN THE LOWER LEVELS. THE INCOMING UPPER VORT
MAX HAS NOT ONLY ADDED A LIFTING MECHANISM...BUT THE MID-LEVEL CAP
HAS BEGUN TO ERODE. THIS WILL ALLOW UPDRAFTS A BETTER ENVIRONMENT
FOR DEVELOPMENT. SHEAR THROUGHOUT THE COLUMN IS FAIRLY WEAK...BUT
THERE IS ENOUGH STEERING FLOW TO PUSH THESE STORMS ALONG AND MAKE
THEM LAST A BIT LONGER THAN THE TYPICAL PULSE CONVECTION.
DEWPOINTS WEST OF THE BLUE RIDGE HAVE DROPPED A FEW DEGREES
OVERALL...BUT MOISTURE REMAIN HIGHER ALONG THE PIEDMONT AND
ESPECIALLY ACROSS THE SERN QUADRANT OF THE CWA.
HIGH PRESSURE WILL CONTINUE TO MOVE OFF THE ATLC COAST TONIGHT...
ALLOWING FOR A PATTERN CHANGE ACROSS THE REGION THAT WILL LIKELY
LAST INTO EARLY NEXT WEEK. SEVERAL BACK-TO-BACK UPPER-LEVEL
SHORTWAVES WILL SLIDE ACROSS THE AREA...THE CURRENT ACTIVITY BEING
THE FIRST.
AFTER SUNSET...INSTABILITY WILL DECREASE...THOUGH A FEW SHOWERS
WILL LINGER OVER THE I-95 CORRIDOR AND EVENTUALLY DISSIPATE. A FEW
OVERNIGHT SHOWERS AND ISOLATED TSTMS NOT OUT OF THE QUESTION
OVERNIGHT AND EARLY FRI OVER THE ERN HALF OF THE CWA. LEFTOVER
OUTFLOW BOUNDARIES COMBINED WITH STILL RELATIVELY HIGH LOW-LEVEL
MOISTURE CONTENT WOULD ALLOW FOR THIS SET-UP.
OVERNIGHT LOWS WILL BE AT LEAST A COUPLE OF DEGREES COOLER THAN LAST
NIGHT ACROSS THE BOARD...BUT EVEN COOLER ACROSS THE WRN HALF OF THE
CWA WITH THE LOWER DEWPOINTS IN PLACE. THE PIEDMONT COASTAL AREAS
WILL RETAIN MORE CLOUD COVER AND HIGHER LOW-LEVEL MOISTURE...AND
THEREFORE SLIGHTLY WARMER OVERNIGHT CONDITIONS.
A FAIRLY SIMILAR SCENARIO TOMORROW...THOUGH LIKELY MORE CLOUDS TO
START OFF THE DAY. ENOUGH BREAKS WILL DEVELOP AFTER SUNRISE TO
CREATE MORE INSTABILITY AND ANOTHER ROUND OF SHOWER/TSTMS ONCE A
MORE POTENT UPPER-LEVEL SHORTWAVE SLIDES OVER THE REGION DURING
THE AFTN/EVE HRS. HIGHS AGAIN WILL APPROACH 90 AND DEWPOINTS WILL
ALSO BE SIMILAR TO TODAY AS WELL...SO CONTINUED WARM AND HUMID
CONDITIONS.
&&
.SHORT TERM /FRIDAY NIGHT THROUGH SATURDAY NIGHT/...
LOW-AMPLITUDE SHRTWV RDGG XPCD ON SAT AS SHRTWV TROF FROM FRI AFTN
EXITS LATE FRI NGT. ALTHOUGH CLD CVR MAY BE BKN...PCPN NOT XPCD
ATTM AS SFC PATTERN ORGANIZES AHEAD OF A STRONGER SHRTWV TROF FROM
THE OHVLY.
&&
.LONG TERM /SUNDAY THROUGH THURSDAY/...
STRONG SHRTWV TROF WILL APRCH LATE SAT NGT AND SUN MRNG. INCRG SLY
FLOW WILL ADVCT MSTR NWD AHEAD OF THIS SYSTEM. WITH SHARPENING SFC
TROF...CNVGNC MAY BE SUFFICIENT FOR WDSPRD SHWRS AND TSTMS. LACK
OF SGFNT INSTBY OWING TO CLD CVR SHUD PRECLUDE ANY SVR WX THREAT.
HOWEVER...HEAVY RN WILL BE A PSBLTY OWING TO HIGH MSTR CONTENT OF
ATMOSPHERE.
THIS WAVE WILL DRIVE A CDFNT SEWD THRU FCST AREA. MSTR WILL BE
SCOURED OUT...LEAVING HIPRES TO DOMINATE FOR MUCH OF THE WK. POPS
WERE DECRD.
MID-WK SYSTEM TIMING STILL UNCERTAIN OWING TO DIFFERENCES BTWN GFS
AND ECMWF. ATTM A SLOWER SOLUTION HAS BEEN FAVORED...LEAVING FCST
AREA DRY FOR RMNDR OF THE WK.
&&
.AVIATION /19Z THURSDAY THROUGH TUESDAY/...
THE MAIN THREAT OVER THE NEXT SEVERAL HRS WILL BE ISOLATED
SHOWERS/TSTMS DEVELOPING IN THE LEE OF THE NRN VA BLUE RIDGE.
THOUGH THIS ACTIVITY IS MOVING SLOWLY EWD...A FEW OF THESE CELLS
MAY BEGIN TO AFFECT AREA TERMINALS AND NEARBY ROUTES. A FEW
OUTFLOW BOUNDARIES FROM TSTM ACTIVITY MAY ALSO CREATE GUSTY WINDS.
THIS ACTIVITY IS EXPECTED TO SUBSIDE CLOSER TO SUNSET...THOUGH A
FEW SHOWERS AND AN ISOLATED STORM COULD DEVELOP OVERNIGHT OVER THE
I-95 CORRIDOR/CHESAPEAKE BAY REGION.
SFC WINDS WILL BE LIGHTER ON FRI...THOUGH ANOTHER NOCTURNAL 30KT JET
MAY AGAIN DEVELOP OVER THE DC/BALT AREA FOR THE PREDAWN HRS. SKIES
WILL BRIEFLY CLEAR OUT DURING THE LATE MRNG HRS /LIKE TODAY/ AND
THEN FILL IN AGAIN TOWARD THE AFTN HRS WITH BATCHES OF CUMULUS AND
SOME MID-LEVEL CLOUDS. SCATTERED SHOWERS AND TSTMS WILL BECOME
MORE PROBABLE TOWARD THE LATE AFTN AND INTO THE EVE HRS.
CONDS XPCD TO DETERIORATE ON SUN AHEAD OF STRONG UPR SYSTEM AS DP
MSTR IS ADVCTD NWD. SHWRS AND TSTMS PSBL DURG THIS TIME. CDFNT
WILL CROSS THE REGION SUN NGT AND MON...SCOURING OUT MSTR AND
LEAVING HIPRES IN ITS WAKE.
&&
.MARINE...
SLY WINDS SLOWLY CHANNELING UP THE BAY...WITH SOME LOW-END SCA GUSTS
APPEARING IN THE OBS. THESE WILL BECOME MORE PREVALENT THRU THE
REST OF THE AFTN/EVE AND THEN DISSIPATE AFTER SUNSET. SCA FOR THE
MAIN CHANNEL OF THE BAY TIL 8PM...THEN THE LOWER HALF OF THE BAY
FOR A FEW HRS AFTER THAT.
WINDS WILL THEN DROP BELOW 10KTS ACROSS MUCH OF THE WATERS INTO
FRIDAY. A FEW AREAS ALONG THE LOWER BAY AND UP THE MAIN CHANNEL MAY
REACH THE 10-15KT RANGE BY MID AFTN...BUT SCA NOT EXPECTED AT THIS
POINT. SCATTERED SHOWERS/TSTMS ALSO POSSIBLE THRU THE AFTN/EVE
TOMORROW.
SLY CHANNELING PSBL SUN AHEAD OF SFC TROF. CDFNT WILL CROSS SUN
NGT AND MON AND MAY BE ACCOMPANIED BY SHWRS AND TSTMS. OTHERWISE...
NO MARINE HAZARDS ANTICIPATED ATTM.
&&
.TIDES/COASTAL FLOODING...
TIDAL ANOMALIES HAVE DROPPED A BIT OVER THE PAST SEVERAL
HRS...ESPECIALLY ON THE TIDAL POTOMAC/DC AREA. HOWEVER...THE MID
AND LOWER BAY REMAIN AROUND A HALF-FOOT ABOVE NORMAL...PARTLY DUE
TO A STEADY SLY FLOW REINFORCING THESE LEVELS. THIS SLY FLOW WILL
CONTINUE THRU THE REST OF THE DAY AND GRADUALLY SUBSIDE INTO THE
OVERNIGHT HRS. THERE MAY NOT BE A STRONG ENOUGH FLOW HOWEVER TO
BRING AREAS ALONG THE WRN SHORE OF THE BAY TO MINOR COASTAL
FLOODING...THOUGH THIS WILL BE MONITORED THROUGHOUT THE EVE HRS.
&&
.LWX WATCHES/WARNINGS/ADVISORIES...
DC...NONE.
MD...NONE.
VA...NONE.
WV...NONE.
MARINE...SMALL CRAFT ADVISORY UNTIL 8 PM EDT THIS EVENING FOR
ANZ530>532-538>540.
SMALL CRAFT ADVISORY UNTIL MIDNIGHT EDT TONIGHT FOR ANZ533-534-
537-541>543.
&&
GMS/KRAMARHazardous weather outlook, Aug 18, 2:35 PM EST, 1 hour 15 minutes before
HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 335 PM EDT THU AUG 18 2011 ANZ530>543-DCZ001-MDZ006-007-011-013-014-016>018-VAZ052>057- 191000- 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- 335 PM EDT THU AUG 18 2011 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...THIS AFTERNOON AND TONIGHT A SMALL CRAFT ADVISORY IS IN EFFECT UNTIL MIDNIGHT FOR THE TIDAL POTOMAC RIVER FROM COBB ISLAND TO SMITH POINT AND FOR THE MARYLAND CHESAPEAKE BAY FROM NORTH BEACH TO SMITH POINT. A SMALL CRAFT ADVISORY IS IN EFFECT UNTIL 8 PM FOR THE MARYLAND CHESAPEAKE BAY NORTH OF NORTH BEACH. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY SHOWERS AND THUNDERSTORMS ARE LIKELY FRIDAY AFTERNOON AND EVENING. ANY THUNDERSTORMS WILL BE CAPABLE OF PRODUCING LOCALLY HEAVY RAIN AND COULD LEAD TO LOCALIZED FLASH FLOODING. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. MDZ003>005-009-010-501-502-VAZ025>031-036>040-042-050-051-501>504- WVZ050>053-055-501>506-191000- 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- 335 PM EDT THU AUG 18 2011 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...THIS AFTERNOON AND TONIGHT NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. KRAMAR
In the hours before
Special weather statement, Aug 18, 12:55 PM EST, 2 hours 55 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
155 PM EDT THU AUG 18 2011
MDZ005-181830-
CARROLL MD-
155 PM EDT THU AUG 18 2011
...STRONG THUNDERSTORM TO AFFECT CARROLL COUNTY...
AT 155 PM EDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM OVER
KEYMAR...MOVING EAST AT 5 MPH.
LOCATIONS IMPACTED INCLUDE TANEYTOWN AND WESTMINSTER.
HEAVY RAIN WITH THIS STORM WILL REDUCE VISIBILITIES TO BELOW ONE MILE
AND MAY CAUSE PONDING OF WATER ON ROADWAYS.
WIND GUSTS OF 40 TO 50 MPH AND SMALL HAIL CAN BE EXPECTED WITH THIS
STORM.
&&
LAT...LON 3968 7695 3955 7696 3959 7723 3959 7725
3968 7723
TIME...MOT...LOC 1755Z 274DEG 6KT 3962 7722
BPPSpecial weather statement, Aug 18, 1:00 PM EST, 2 hours 50 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 200 PM EDT THU AUG 18 2011 VAZ501-181830- NORTHERN FAUQUIER VA- 200 PM EDT THU AUG 18 2011 ...STRONG THUNDERSTORM TO AFFECT NORTHERN FAUQUIER COUNTY... AT 200 PM EDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM 2 MILES NORTHEAST OF ORLEAN...MOVING EAST AT 15 MPH. LOCATIONS IMPACTED INCLUDE MEADOWVILLE...BETHEL AND AIRLIE. HEAVY RAIN WITH THIS STORM WILL REDUCE VISIBILITIES TO BELOW ONE MILE AND MAY CAUSE PONDING OF WATER ON ROADWAYS. WIND GUSTS OF 40 TO 50 MPH AND SMALL HAIL CAN BE EXPECTED WITH THIS STORM. && LAT...LON 3884 7778 3873 7777 3874 7799 3881 7801 TIME...MOT...LOC 1800Z 265DEG 12KT 3878 7793 BPP
Local storm report, Aug 18, 1:05 PM EST, 2 hours 45 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
205 PM EDT THU AUG 18 2011
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0203 PM HAIL 1 NE CRESTHILL 38.78N 78.00W
08/18/2011 E0.75 INCH FAUQUIER VA TRAINED SPOTTER
&&
EVENT NUMBER LWX1101441
MEADOWSLocal storm report, Aug 18, 1:25 PM EST, 2 hours 25 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
225 PM EDT THU AUG 18 2011
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0157 PM HAIL 2 NNE KEYMAR 39.62N 77.23W
08/18/2011 E0.75 INCH CARROLL MD PUBLIC
&&
EVENT NUMBER LWX1101442
KRAMARSpecial weather statement, Aug 18, 2:51 PM EST, 59 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 351 PM EDT THU AUG 18 2011 MDZ014-182015- ANNE ARUNDEL MD- 351 PM EDT THU AUG 18 2011 ...STRONG THUNDERSTORM TO AFFECT ANNE ARUNDEL COUNTY... AT 349 PM EDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM OVER FORT MEADE...MOVING NORTHEAST AT 20 MPH. LOCATIONS IMPACTED INCLUDE SEVERN...BALTIMORE-WASHINGTON INTERNATIONAL AIRPORT AND SOUTH GATE. HEAVY RAIN WITH THIS STORM WILL REDUCE VISIBILITIES TO BELOW ONE MILE AND MAY CAUSE PONDING OF WATER ON ROADWAYS. WIND GUSTS OF 40 TO 50 MPH AND SMALL HAIL CAN BE EXPECTED WITH THIS STORM. && LAT...LON 3909 7660 3905 7679 3910 7683 3921 7669 TIME...MOT...LOC 1949Z 247DEG 17KT 3909 7675 BPP
Special weather statement, Aug 18, 3:18 PM EST, 32 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
418 PM EDT THU AUG 18 2011
MDZ010-011-014-182100-
HOWARD MD-ANNE ARUNDEL MD-SOUTHERN BALTIMORE MD-
418 PM EDT THU AUG 18 2011
...STRONG THUNDERSTORM TO AFFECT HOWARD...ANNE ARUNDEL AND SOUTHERN
BALTIMORE COUNTIES...
AT 418 PM EDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM OVER
SOUTH GATE...MOVING NORTHEAST AT 20 MPH.
LOCATIONS IMPACTED INCLUDE FERNDALE...BROOKLYN PARK...PUMPHREY...
LOCUST POINT...TURNERS STATION...JOSEPHINE LEE...HIGHLANDTOWN...
DUNDALK...EASTPOINT AND ARMISTEAD GARDENS.
HEAVY RAIN WITH THIS STORM WILL REDUCE VISIBILITIES TO BELOW ONE MILE
AND MAY CAUSE PONDING OF WATER ON ROADWAYS.
WIND GUSTS OF 40 TO 50 MPH CAN BE EXPECTED WITH THIS STORM.
&&
LAT...LON 3920 7645 3921 7646 3920 7649 3925 7655
3926 7660 3922 7656 3922 7652 3920 7653
3917 7649 3917 7646 3903 7658 3913 7677
3938 7670 3931 7635
TIME...MOT...LOC 2018Z 209DEG 16KT 3915 7663
BPPThe radar
The Sterling radar (KLWX), 67 km away, was scanning. The volume nearest the first event began at 20:48 UTC.
Event by event
26 hail, 11 thunderstorm wind, 1 lightning. Local standard time, as filed.
Thunderstorm Wind, Anne Arundel
- When
- August 18, 4:08 PM EST
- Where
- Anne Arundel County, 1.06 mi S of Severn
- Measured
- 52 kt (60 mph) estimated gust
- Reported by
- Trained Spotter
- Coordinates
- 39.115, -76.699
Wind gusts were estimated to be around 60 mph.
Thunderstorm Wind, Anne Arundel
- When
- August 18, 4:15 PM EST
- Where
- Anne Arundel County, 1.34 mi E of Mayfield
- Measured
- 52 kt (60 mph) estimated gust
- Reported by
- Trained Spotter
- Coordinates
- 39.099, -76.655
A tree about one to one and one half feet in diameter was blown down from thunderstorm winds.
Hail, Carroll
- When
- August 18, 4:26 PM EST
- Where
- Carroll County, 1.83 mi NE of Mt Airy
- Measured
- 1 in hail
- Reported by
- Other Federal Agency
- Coordinates
- 39.401, -77.129
Hail up to quarters in size was reported near Mount Airy.
Thunderstorm Wind, Harford
- When
- August 18, 4:26 PM EST
- Where
- Harford County, 0.6 mi NW of Emmorton
- Measured
- 50 kt (58 mph) estimated gust
- Property damage
- $1,000
- Reported by
- Trained Spotter
- Coordinates
- 39.506, -76.328
A tree was blocking the roadway near Patterson Mill Road and Route 924.
Hail, Harford
- When
- August 18, 4:34 PM EST
- Where
- Harford County, 0.88 mi ENE of Emmorton
- Measured
- 1.75 in hail
- Reported by
- Public
- Coordinates
- 39.504, -76.304
Hail up to the size of golf balls was reported.
Thunderstorm Wind, Harford
- When
- August 18, 4:36 PM EST
- Where
- Harford County, 1.88 mi SW of Calvary
- Measured
- 56 kt (64 mph) estimated gust
- Property damage
- $1,000
- Reported by
- State Official
- Coordinates
- 39.508, -76.270
A tree was down along MD-543 and Calvary Road.
Thunderstorm Wind, Anne Arundel
- When
- August 18, 4:40 PM EST
- Where
- Anne Arundel County, 0.84 mi NW of Conaways
- Measured
- 56 kt (64 mph) estimated gust
- Property damage
- $15,000
- Reported by
- Public
- Coordinates
- 39.028, -76.712
A tree was blown onto a garage crushing the roof. A car was also damaged in the garage. Multiple 150 year old trees were blown down.
Hail, Harford
- When
- August 18, 4:40 PM EST
- Where
- Harford County, 0.55 mi SSW of Calvary
- Measured
- 1 in hail
- Reported by
- Public
- Coordinates
- 39.523, -76.254
Quarter sized hail was reported.
Thunderstorm Wind, Harford
- When
- August 18, 4:43 PM EST
- Where
- Harford County, 0.4 mi ENE of Pleasantville
- Measured
- 50 kt (58 mph) estimated gust
- Property damage
- $1,000
- Reported by
- State Official
- Coordinates
- 39.573, -76.423
A tree was down along High Point Road.
Hail, Harford
- When
- August 18, 4:48 PM EST
- Where
- Harford County, 0.74 mi NNE of Aldino Arpt
- Measured
- 2.25 in hail
- Reported by
- Public
- Coordinates
- 39.580, -76.195
Large hail 2.25 inches in diameter was reported.
Lightning, Harford
- When
- August 18, 4:53 PM EST
- Where
- Harford County, 1.28 mi ESE of Singer
- Injuries
- 1 direct, 0 indirect
- Reported by
- Fire Department/Rescue
- Coordinates
- 39.470, -76.310
A person was injured by lightning while using an ATM machine.
Hail, Harford
- When
- August 18, 5:00 PM EST
- Where
- Harford County, 0.49 mi WNW of Lapidum
- Measured
- 1.75 in hail
- Reported by
- State Official
- Coordinates
- 39.602, -76.139
Golf ball sized hail was reported at the Steppingstone Museum.
Hail, Harford
- When
- August 18, 5:01 PM EST
- Where
- Harford County, 2.03 mi NW of Havre de Grace
- Measured
- 1 in hail
- Reported by
- Public
- Coordinates
- 39.569, -76.129
Hail up to quarters in size was reported.
Hail, Baltimore
- When
- August 18, 5:12 PM EST
- Where
- Baltimore County, 2.58 mi S of Pleasant Grove
- Measured
- 1 in hail
- Reported by
- Public
- Coordinates
- 39.533, -76.781
Quarter sized hail was reported near Boring.
Thunderstorm Wind, Anne Arundel
- When
- August 18, 5:15 PM EST
- Where
- Anne Arundel County, 1.34 mi E of Mayfield
- Measured
- 52 kt (60 mph) estimated gust
- Property damage
- $1,000
- Reported by
- Public
- Coordinates
- 39.099, -76.655
A tree that was one to one and one half feet in diameter was blown down.
Hail, Montgomery
- When
- August 18, 5:15 PM EST
- Where
- Montgomery County, 0.75 mi SSW of Wheaton
- Measured
- 1 in hail
- Reported by
- Trained Spotter
- Coordinates
- 39.040, -77.055
Quarter sized hail was reported at Wheaton.
Hail, Montgomery
- When
- August 18, 5:15 PM EST
- Where
- Montgomery County, 0.87 mi SE of Ken Gar
- Measured
- 1.25 in hail
- Reported by
- Broadcast Media
- Coordinates
- 39.040, -77.060
Half dollar sized hail was reported in Wheaton.
Hail, Montgomery
- When
- August 18, 5:19 PM EST
- Where
- Montgomery County, 0.28 mi WNW of Ken Gar
- Measured
- 1 in hail
- Reported by
- Trained Spotter
- Coordinates
- 39.052, -77.075
Quarter sized hail was reported at the intersection of Connecticut Avenue and Viers Mill Road.
Hail, Montgomery
- When
- August 18, 5:20 PM EST
- Where
- Montgomery County, 0.84 mi ENE of Homewood
- Measured
- 1.5 in hail
- Reported by
- Public
- Coordinates
- 39.034, -77.035
Hail up to the size of ping pong balls was reported near Wheaton.
Hail, Montgomery
- When
- August 18, 5:24 PM EST
- Where
- Montgomery County, 0.52 mi ENE of Glenmont
- Measured
- 1 in hail
- Reported by
- Public
- Coordinates
- 39.072, -77.061
Quarter sized hail was reported near Glenmont.
Hail, Montgomery
- When
- August 18, 5:33 PM EST
- Where
- Montgomery County, 1.42 mi S of Fairland
- Measured
- 1.75 in hail
- Reported by
- Trained Spotter
- Coordinates
- 39.060, -76.954
Golf ball sized hail was reported in Calverton.
Hail, Montgomery
- When
- August 18, 5:35 PM EST
- Where
- Montgomery County, 0.64 mi S of Fairland
- Measured
- 1.75 in hail
- Reported by
- Public
- Coordinates
- 39.071, -76.949
Golf ball sized hail was reported.
Hail, Prince George'S
- When
- August 18, 5:36 PM EST
- Where
- Prince George'S County, 1.07 mi W of Ammendale
- Measured
- 1 in hail
- Reported by
- Public
- Coordinates
- 39.050, -76.920
Quarter sized hail was reported.
Hail, Montgomery
- When
- August 18, 5:38 PM EST
- Where
- Montgomery County, 0.2 mi SW of Fairland
- Measured
- 1 in hail
- Reported by
- Public
- Coordinates
- 39.078, -76.952
Quarter sized hail was reported.
Hail, Prince George'S
- When
- August 18, 5:47 PM EST
- Where
- Prince George'S County, 0.49 mi WSW of Laurel
- Measured
- 1.5 in hail
- Reported by
- Broadcast Media
- Coordinates
- 39.098, -76.859
Hail up to the size of ping pong balls was reported in Laurel.
Hail, Anne Arundel
- When
- August 18, 5:52 PM EST
- Where
- Anne Arundel County, 0.59 mi E of Maryland City
- Measured
- 1 in hail
- Reported by
- Trained Spotter
- Coordinates
- 39.100, -76.809
Quarter sized hail was reported near Laurel.
Hail, Anne Arundel
- When
- August 18, 5:56 PM EST
- Where
- Anne Arundel County, 1.42 mi NNW of Green Haven
- Measured
- 1 in hail
- Reported by
- Trained Spotter
- Coordinates
- 39.148, -76.563
Quarter sized hail was reported near Green Haven.
Hail, Anne Arundel
- When
- August 18, 6:07 PM EST
- Where
- Anne Arundel County, 0.54 mi W of Pioneer City
- Measured
- 1 in hail
- Reported by
- Broadcast Media
- Coordinates
- 39.130, -76.730
Quarter sized hail was reported at Fort Meade.
Hail, Anne Arundel
- When
- August 18, 6:09 PM EST
- Where
- Anne Arundel County, 0.69 mi N of Pioneer City
- Measured
- 1 in hail
- Reported by
- Broadcast Media
- Coordinates
- 39.140, -76.720
Quarter sized hail was reported near Severn.
Hail, Anne Arundel
- When
- August 18, 6:20 PM EST
- Where
- Anne Arundel County, 1.14 mi N of Marley
- Measured
- 1 in hail
- Reported by
- Public
- Coordinates
- 39.166, -76.602
Quarter sized hail was reported at Glen Burnie.
Hail, Washington
- When
- August 18, 8:40 PM EST
- Where
- Washington County, 0.63 mi NNW of Clear Spg
- Measured
- 1 in hail
- Reported by
- Public
- Coordinates
- 39.658, -77.936
Quarter sized hail was reported.
Thunderstorm Wind, Washington
- When
- August 18, 8:44 PM EST
- Where
- Washington County, 0.63 mi NNW of Clear Spg
- Measured
- 52 kt (60 mph) estimated gust
- Reported by
- Public
- Coordinates
- 39.658, -77.936
Trees and large limbs were down in Clear Spring.
Thunderstorm Wind, Washington
- When
- August 18, 9:15 PM EST
- Where
- Washington County, 1.03 mi SE of Funkstown
- Measured
- 56 kt (64 mph) estimated gust
- Property damage
- $5,000
- Reported by
- State Official
- Coordinates
- 39.608, -77.708
Multiple reports of trees were down across the eastern parts of Washington County.
Hail, Washington
- When
- August 18, 9:15 PM EST
- Where
- Washington County, 1.35 mi E of Roxbury
- Measured
- 1 in hail
- Reported by
- Public
- Coordinates
- 39.574, -77.695
Quarter sized hail was reported near Funkstown.
Thunderstorm Wind, Washington
- When
- August 18, 9:44 PM EST
- Where
- Washington County, 1.51 mi N of Keedysville
- Measured
- 56 kt (64 mph) estimated gust
- Property damage
- $2,000
- Reported by
- Public
- Coordinates
- 39.501, -77.706
Several Sycamore trees were snapped off due to thunderstorm winds.
Hail, Washington
- When
- August 18, 9:45 PM EST
- Where
- Washington County, 1.56 mi NNW of Keedysville
- Measured
- 1 in hail
- Reported by
- Public
- Coordinates
- 39.502, -77.708
Quarter sized hail was reported near Keedysville.
Thunderstorm Wind, Baltimore
- When
- August 18, 11:04 PM EST
- Where
- Baltimore County, 1.63 mi ENE of Bentley Spgs
- Measured
- 56 kt (64 mph) estimated gust
- Property damage
- $2,000
- Reported by
- Public
- Coordinates
- 39.682, -76.654
Large limbs were down due to thunderstorm winds.
What these are
- Hail
- Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.
- Thunderstorm Wind
- Winds from a thunderstorm of 50 knots (58 mph) or more, or lower winds that caused damage or casualties. Measured gusts are marked MG, estimated EG.
- Lightning
- A lightning strike that killed, injured or caused damage.
After NWS Directive 10-1605, the rules offices file Storm Data by.
The same day elsewhere
- Hail and Damaging Winds in Missouri, August 18 to 19, 2011
- Flash Flooding and Hail in Utah, August 18 to 22, 2011
- Hail and Damaging Winds in South Dakota, August 18, 2011
- Hail and Damaging Winds in Iowa, August 18, 2011
- Hail in Ohio, August 18 to 19, 2011
- Flash Flood and Damaging Winds in Arizona, August 18, 2011
- Hail in South Dakota, August 18, 2011
- Flash Flood and Hail in Nebraska, August 18, 2011
- Tornado and Hail in North Carolina, August 18, 2011
- Hail and Damaging Winds in Pennsylvania, August 18 to 19, 2011
- Flash Flood and Dust Storm in Arizona, August 18, 2011
- Tornado and Flash Flood in Nebraska, August 18, 2011
More
Every storm in Maryland in 2011Every state in 2011This day in weather historyWarnings in Maryland, August 2011
Sources
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: 342402, 342407, 342448, 342410, 342449, 342412, 342414, 342408, 342413, 342419, 367369, 342455, 342420, 342416, 342411, 342409, 342421, 342450, 342415, 342451, 342418, 342417, 342422, 342423, 342452, 342453, 342403, 342454, 342406, 342405, 342404, 342456, 342488, 342459, 342464, 342461, 342463, 342489.