Flash Flooding in Virginia, July 5 to 6, 2006

Name: Flash Flooding in Virginia, July 5 to 6, 2006
Start: 2006-07-05T14:45
End: 2006-07-06T06:00
Location: Virginia

July 5 to 6, 2006 · NWS LWX · 4 events in 4 counties and zones

After the severe storms of July 4th around the region, additional severe weather occurred on the 5th and early on the 6th. There were numerous reports of flash flooding and wind damage from these storms as they moved through the Washington/Baltimore region.

Where it happened

Every event with a place to put it; 4 filed by county or forecast zone are drawn at its center, in a lighter ring. 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

Open the live radar over this ground

The toll

Deaths: 0
Injuries: 0
Property damage: None recorded
Crop damage: None recorded
Events: 4

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.

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 Jul 5, 2:04 PM EST, 41 minutes earlier.

Area forecast discussion, Jul 5, 2:04 PM EST, 41 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
304 PM EDT WED JUL 5 2006

.SHORT TERM /TONIGHT THROUGH THURSDAY/...
ONE LAST DAY OF SVR WX GETTING UNDERWAY ACROSS THE LWX CWA. MORNING
IAD RAOB MODIFIED FOR A CONSERVATIVE 85/72 SURFACE CONDS YIELDS
AROUND 1300 J/KG OF MLCAPE WITH NO INHIBITION. DEEP LYR SHEAR
SUFFICIENT TO LEAD TO STORM ORGANIZATION AND SHORT LINES AND BOWING
SEGMENTS.

MAIN SVR RISK WOULD BE DAMAGING WINDS AND HAVE HIGHLIGHTED SUCH
IN THE ZONES. HAIL POTENTIAL PRETTY LOW OVERALL AS THERE IS NOT
MUCH DRY AIR AVAILABLE IN THE MID LEVELS DESPITE INCREASING LAPSE
RATES.

MUCH MORE MOIST SOUNDING OVERALL TODAY WITH PWAT VALUES AROUND 2
INCHES. THIS IS A CONCERN IN LOCAL AREAS WHERE HEAVY RAINFALL OVER
THE PAST COUPLE OF DAYS HAS DROPPED FFG VALUES PRETTY LOW. WILL
CONTINUE THE FFA FOR THE CURRENT AREA.

CDFNT SLOWLY SAGS SOUTH OVERNIGHT WITH NORTH WINDS DEVELOPING. PCPN
MAY LINGER BRIEFLY INTO THE MORNING TOMORROW OVER FAR SOUTHEAST
ZONES AND WL CARRY LOW POPS.

&&

.LONG TERM /THURSDAY NIGHT THROUGH WEDNESDAY/...
OBSERVATIONS...
500MB NORTHERN HEMISPHERIC HEIGHT/ANOMALY PATTERN DURING THE PAST
5 DAYS INDICATES A RIDGE/TROUGH CONUS PATTERN BECAME
ZONAL...BEFORE TRANSITIONING BACK TO A RIDGE/TROUGH PATTERN. THE
FLOW ACROSS THE PACIFIC HAS BECOME INCREASINGLY BLOCKED. WATER
VAPOR SHOWS A STRONG UPPER LOW ACROSS QUEBEC IS LOWERING HEIGHTS
ACROSS THE GREAT LAKES REGION. AN UPPER LOW/RIDGE/UPPER LOW
PATTERN IS NEARLY STATIONARY FROM TEXAS EAST TO OFF THE FLORIDA
ATLANTIC COAST. 11Z SURFACE ANALYSIS PLACED A COLD FRONT FROM NEW
ENGLAND SOUTHWEST THROUGH CENTRAL PENNSYLVANIA AND SOUTHEAST OHIO
(WHERE THE BOUNDARY STALLS). A TROUGH IS NOTED IN THE LEE OF THE
APPALACHIANS.

MODELS...
THE 12Z NAM/GFS/CANADIAN/UKMET ALONG WITH THE 00Z ECMWF WERE
EXAMINED. EACH WAS SIMILAR WITH ITS SYNOPTIC DEPICTION...WITH THE
MAIN TROUGH AXIS MOVING ACROSS NEW ENGLAND LATE THIS WORK WEEK. THEY
INDICATE A PIECE OF THIS TROUGH IS LIKELY TO SHEAR SOUTH...WITH AN
UPPER LOW DEVELOPING ACROSS THE MID ATLANTIC THROUGH THE WEEKEND.
THIS UPPER LOW IS SHOWN TO WEAKEN AND LIFT NORTHEAST EARLY NEXT
WEEK...AS HEIGHTS ACROSS MUCH OF THE CONUS INCREASE.

ENSEMBLE DATA...
500MB HEIGHT GFS ENSEMBLE MEMBERS FROM 00Z INDICATE
GOOD CERTAINTY WITH PASSING A TROUGH AXIS ACROSS NEW ENGLAND
THURSDAY. THERE IS MORE CERTAINTY THAT A TROUGH DEVELOPS OFF THE
EAST COAST INTO THE WEEKEND. THERE IS GOOD CERTAINTY AMONGST THE
MEMBERS THAT THE HEIGHT GRADIENT LIFTS FURTHER NORTH INTO CANADA
NEXT WEEK...GENERALLY ALLOWING FOR RISING HEIGHTS ACROSS THE CONUS.
SEVERAL MEMBERS INDICATE A WAVE WILL PROPAGATE EAST UNDERNEATH THE
BUILDING HEIGHTS AND APPROACH FOR THE END OF THE FORECAST CYCLE.

ENSEMBLE GFS MOS FROM 00Z INDICATE MEAN HIGHS RISE FROM THE LOWER
80S LATE THIS WEEK...INTO THE MID 80S SATURDAY ONWARD. MEAN LOWS IN
THE UPPER 50S FRIDAY MORNING MORNING...RISE WELL INTO THE MID 60S BY
MONDAY MORNING. MEAN POPS RISE TO NEAR 20 POPS MONDAY ONWARD.

FORECAST RATIONALE...
AS OF NOW...KEPT THE FORECAST DRY SATURDAY. THERE COULD BE AN
OPPORTUNITY FOR LIGHT SHOWERS ASSOCIATED WITH THE UPPER LOW. ONCE
THE PLACEMENT OF THE UPPER LOW...ITS VORTICITY LOBES...AND PROXIMITY
TO THE FRONTAL ZONE AND MOISTURE PLUME CAN BE MORE CONFIDENTLY
ESTABLISHED...SHOWERS MAY HAVE TO PLACED IN THE FORECAST. HAVE
INCREASED SKY COVER TO REFLECT AMOUNT OF CUMULUS DEVELOPMENT
EXPECTED GIVEN WEAKENING DOWNSLOPE FLOW AND SATURATED SOILS.
WRF-NMM (NAM) TENDS TO BUILD TROUGHS IN TOO MUCH ACROSS THIS REGION.
FOLLOWED THE CANADIAN AND GFS DEPICTION OF THE UPPER LOW MORE
CLOSELY.

CONFIDENCE LATER IN THE EXTENDED IS NOT QUITE HIGH AS YESTERDAY.
SEVERAL MODELS INDICATE A WAVE MAY SNEAK UNDERNEATH THE MAIN
STEERING FLOW AS HEIGHTS RISE ACROSS THE CONUS. TIMING THIS WAVE IS
PROBLEMATIC...HAVE SLIGHT CHANCE TO CHANCE POPS PER HPC LATE DURING
THE FORECAST CYCLE.

&&

.AVIATION...
CD FNT TO THE N WL MOVE INTO THE RGN OVRNGT. THIS WL TRIGGER TSTMS
DURG THE LATE AFTN/EVE HRS. FOR NOW HV INCLUDED A TEMPO WIND GUST
GROUP TO 30 KT...HOWEVER THIS MAY NEED TO BE AMENDED UPWARD WHEN
STORMS DVLP. AFTRWRDS NW WINDS WL BRING IN DRIER AIR...THIS WL KEEP
DOWN THE FOG PTNL.

&&

.LWX WATCHES/WARNINGS/ADVISORIES...
DC...FLASH FLOOD WATCH FOR DCZ001 UNTIL 8 AM THURSDAY.
MD...FLASH FLOOD WATCH FOR MDZ002>007-009>011-013-014-016>018 UNTIL
     8 AM THURSDAY.
VA...FLASH FLOOD WATCH FOR VAZ042-052>057 UNTIL 8 AM THURSDAY.
WV...FLASH FLOOD WATCH FOR WVZ051>053 UNTIL 8 AM THURSDAY.
MARINE...NONE.
&&

SHORT TERM...MANNING
LONG TERM...ROGOWSKI
AVIATION...ABW

Hazardous weather outlook, Jul 5, 10:40 AM EST, 4 hours 5 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1140 AM EDT WED JUL 5 2006

ANZ530>537-DCZ001-MDZ002>007-009>011-013-014-016>018-VAZ021-
025>031-036>042-050>057-WVZ048>055-061015-
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-
DISTRICT OF COLUMBIA-ALLEGANY-WASHINGTON-FREDERICK MD-CARROLL-
NORTHERN BALTIMORE-HARFORD-MONTGOMERY-HOWARD-SOUTHERN BALTIMORE-
PRINCE GEORGES-ANNE ARUNDEL-CHARLES-ST. MARYS-CALVERT-HIGHLAND-
AUGUSTA-ROCKINGHAM-SHENANDOAH-FREDERICK VA-PAGE-WARREN-CLARKE-
NELSON-ALBEMARLE-GREENE-MADISON-RAPPAHANNOCK-FAUQUIER-LOUDOUN-
ORANGE-CULPEPER-PRINCE WILLIAM/MANASSAS/MANASSAS PARK-FAIRFAX-
ARLINGTON/FALLS CHURCH/ALEXANDRIA-STAFFORD-SPOTSYLVANIA-
KING GEORGE-GRANT-MINERAL-HAMPSHIRE-MORGAN-BERKELEY-JEFFERSON-
PENDLETON-HARDY-
1140 AM EDT WED JUL 5 2006

THIS HAZARDOUS WEATHER OUTLOOK IS FOR MARYLAND WEST OF THE
EASTERN SHORE INCLUDING THE CHESAPEAKE BAY AND EAST OF GARRETT
COUNTY...EASTERN WEST VIRGINIA...NORTHERN AND CENTRAL VIRGINIA...
WASHINGTON DC AND THE TIDAL POTOMAC RIVER.

.DAY ONE...TODAY AND TONIGHT

A FEW SEVERE THUNDERSTORMS ARE POSSIBLE ACROSS THE REGION THIS
AFTERNOON AND THIS EVENING. A COLD FRONT WILL SLOWLY PUSH SOUTH
ACROSS THE AREA AND PRODUCE SHOWERS AND THUNDERSTORMS OVER THE MID
ATLANTIC. ANY SEVERE THUNDERSTORMS THAT DEVELOP WILL HAVE THE
POTENTIAL TO PRODUCE DAMAGING WINDS AS WELL AS VERY HEAVY RAIN. THE
MOST LIKELY TIME FOR SEVERE WEATHER WILL BE BETWEEN 2 PM AND 8 PM.

RECENT RAINFALL HAS LEFT SOIL CONDITIONS SATURATED ACROSS THE
INTERSTATE 95 CORRIDOR...NORTHERN SHENANDOAH VALLEY AND SOUTHERN
MARYLAND. HEAVY RAINFALL FROM THUNDERSTORMS TODAY MAY LEAD TO FLASH
FLOODING OF SMALL CREEKS...STREAMS AND URBAN AREAS. A FLASH FLOOD
WATCH HAS BEEN ISSUED FOR A PORTION OF THE AREA THROUGH TONIGHT.
PLEASE REFER TO /WBCFFALWX/ FOR FURTHER DETAILS.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE REQUIRED LATER TODAY.

MANNING

In the hours before

Local storm report, Jul 5, 11:57 AM EST, 2 hours 48 minutes before

PRELIMINARY LOCAL STORM REPORT...SUMMARY RETRANSMITTED
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1257 PM EDT WED JUL 05 2006

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0215 PM     TSTM WND DMG     E HILLSBORO             39.20N 77.72W
07/04/2006                   LOUDOUN            VA   PUBLIC

            SEVERAL TREES DOWN.

0240 PM     TSTM WND DMG     3 SW GERMANTOWN         39.15N 77.30W
07/04/2006                   MONTGOMERY         MD   FIRE DEPT/RESCUE

            TREES AND POWERLINES DOWNED.

0300 PM     TSTM WND DMG     10 E JARRETTSVILLE      39.60N 76.28W
07/04/2006                   HARFORD            MD   UTILITY COMPANY

            TREE DOWN

0330 PM     TSTM WND DMG     STRASBURG               38.99N 78.36W
07/04/2006                   SHENANDOAH         VA   UTILITY COMPANY

            TREES DOWNED POWERLINES

0340 PM     TSTM WND DMG     RELIANCE                39.01N 78.25W
07/04/2006                   WARREN             VA   FIRE DEPT/RESCUE

            TREES DOWNED.

0341 PM     TSTM WND DMG     COCKEYSVILLE            39.48N 76.63W
07/04/2006                   BALTIMORE          MD   FIRE DEPT/RESCUE

            TREE FALLEN ONTO VEHICLE ON I-83 NORTH OF BALTIMORE CITY.

0345 PM     TSTM WND DMG     UPPERVILLE              38.99N 77.89W
07/04/2006                   FAUQUIER           VA   LAW ENFORCEMENT

            TREES AND POWERLINES DOWN.

0350 PM     TSTM WND DMG     3 E BETHEL              39.03N 77.99W
07/04/2006                   CLARKE             VA   FIRE DEPT/RESCUE

            TREES DOWNED

0354 PM     TSTM WND DMG     5 SE BOYCE              39.04N 77.99W
07/04/2006                   CLARKE             VA   EMERGENCY MNGR

            FALLING TREES TOOK DOWN POWERLINES

0430 PM     TSTM WND DMG     UPPERVILLE              38.99N 77.89W
07/04/2006                   LOUDOUN            VA   TRAINED SPOTTER

            SEVERAL TREES AND POWERLINES DOWN ON MILLSVILLE ROAD.

0430 PM     TSTM WND DMG     3 W MIDDLEBURG          38.97N 77.80W
07/04/2006                   FAUQUIER           VA   TRAINED SPOTTER

            TREE AND POWERLINES DOWN AT JUNCTION OF SAINT LOUIS ROAD
            AND RT. 50

0445 PM     TSTM WND DMG     CHEVY CHASE             38.99N 77.07W
07/04/2006                   MONTGOMERY         MD   EMERGENCY MNGR

            NUMEROUS TREES DOWN ACROSS SOUTHERN MONTGOMERY COUNTY

0450 PM     HAIL             HERNDON                 38.97N 77.39W
07/04/2006  E0.75 INCH       FAIRFAX            VA   TRAINED SPOTTER

            3/4 INCH HAIL WAS OBSERVED AT INTERSECTION OF CENTREVILLE
            ROAD AND WEST OX ROAD.

0450 PM     TSTM WND DMG     3 NE WHEATON            39.07N 77.02W
07/04/2006                   MONTGOMERY         MD   TRAINED SPOTTER

            MANY TREES DOWN IN THE NORTHWEST BRANCH PARK.

0455 PM     TSTM WND DMG     OAKTON                  38.89N 77.30W
07/04/2006                   FAIRFAX            VA   PUBLIC

            SEVERAL TREES DOWNED ON OAKTON TERRACE ROAD.

0455 PM     HAIL             CENTREVILLE             38.85N 77.44W
07/04/2006  E1.00 INCH       FAIRFAX            VA   TRAINED SPOTTER

            ONE INCH HAIL REPORTED IN CENTREVILLE BY SKYWARN OBSERVER

0505 PM     TSTM WND DMG     1 S FAIRFAX             38.84N 77.30W
07/04/2006                   CITY OF FAIRFAX    VA   TRAINED SPOTTER

            TREES DOWN AT INTERSECTION OF COLLINHAM AND KAYWOOD COURT
            NEAR ROBINSON HIGH SCHOOL.

0505 PM     TSTM WND DMG     FALLS CHURCH            38.88N 77.17W
07/04/2006                   CITY OF FALLS CHUR VA   LAW ENFORCEMENT

            TREES AND POWER LINES DOWN 300 BLOCK OF WEST COLUMBIA ST

0515 PM     TSTM WND DMG     WASHINGTON              38.91N 77.02W
07/04/2006                   DISTRICT OF COLUMB DC   PARK/FOREST SRVC

            LARGE ELM TREES DOWN ON THE MALL.

0515 PM     TSTM WND DMG     3 N FAIRFAX             38.89N 77.29W
07/04/2006                   FAIRFAX            VA   TRAINED SPOTTER

            LARGE TREES BLOWN DOWN.

0515 PM     TSTM WND DMG     ARLINGTON               38.88N 77.10W
07/04/2006                   ARLINGTON          VA   PARK/FOREST SRVC

            TREES DOWN ON GEORGE WASHINGTON PARKWAY

0515 PM     TSTM WND DMG     HUNTLY                  38.83N 78.11W
07/04/2006                   RAPPAHANNOCK       VA   LAW ENFORCEMENT

            NUMEROUS TREES DOWN IN THE HUNTLY AREA.

0517 PM     TSTM WND DMG     WASHINGTON              38.91N 77.02W
07/04/2006                   DISTRICT OF COLUMB DC   PARK/FOREST SRVC

            TENTS BLOWN DOWN ON THE MALL.

0520 PM     TSTM WND DMG     WHEATON                 39.04N 77.06W
07/04/2006                   MONTGOMERY         MD   NWS EMPLOYEE

            MANY TREES AND POWERLINES DOWNED. REPORT BY NOAA
            EMPLOYEE.

0530 PM     TSTM WND DMG     N UNIVERSITY PARK       38.97N 76.94W
07/04/2006                   PRINCE GEORGES     MD   PUBLIC

            TREES DOWNS IN COLLEGE HEIGHT ESTATES.

0530 PM     NON-TSTM WND DMG WASHINGTON              38.91N 77.02W
07/04/2006                   DISTRICT OF COLUMB DC   FIRE DEPT/RESCUE

            BUILDING COLLASPED DUE TO HIGH WINDS IN SOUTHEAST
            WASHINGTON.

0530 PM     TSTM WND DMG     ALEXANDRIA              38.82N 77.09W
07/04/2006                   CITY OF ALEXANDRIA VA   EMERGENCY MNGR

            SEVERAL TREES DOWNED. DAMAGE TO ONE BUILDING UNDER
            CONSTRUCTION.

0535 PM     TSTM WND DMG     ANNAPOLIS               38.97N 76.50W
07/04/2006                   ANNE ARUNDEL       MD   EMERGENCY MNGR

            20-30 TREES DOWN ON HOUSES.

0538 PM     TSTM WND DMG     BEALETON                38.57N 77.76W
07/04/2006                   FAUQUIER           VA   PUBLIC

            TREES AND POWERLINES DOWN.

0544 PM     TSTM WND DMG     HYBLA VALLEY            38.75N 77.08W
07/04/2006                   FAIRFAX            VA   EMERGENCY MNGR

            TREE DOWN ON GEORGE WASHINGTON PARKWAY

0550 PM     TSTM WND GST     NOKESVILLE              38.70N 77.58W
07/04/2006  E60.00 MPH       PRINCE WILLIAM     VA   PUBLIC

            PEA SIZED HAIL, ROOF DAMAGED, AND ESTIMATED WIND GUSTS TO
            60 MPH 5 SSE OF MANASSAS AIRPORT.

0630 PM     TSTM WND DMG     BRANDYWINE              38.70N 76.85W
07/04/2006                   PRINCE GEORGES     MD   EMERGENCY MNGR

            TRESS DOWN ACROSS SOUTHERN PRINCE GEORGES COUNTY

0630 PM     TSTM WND DMG     NANJEMOY                38.45N 77.22W
07/04/2006                   CHARLES            MD   EMERGENCY MNGR

            TREES DOWN

1045 PM     TSTM WND DMG     MECHANICSVILLE          38.43N 76.73W
07/04/2006                   ST. MARYS          MD   FIRE DEPT/RESCUE

            TREES DOWNED

1055 PM     TSTM WND DMG     CALIFORNIA              38.30N 76.50W
07/04/2006                   ST. MARYS          MD   FIRE DEPT/RESCUE

            TREES DOWNED IN CALIFORNIA AND LEXINGTON PARK.

&&

ROGOWSKI/KL

Local storm report, Jul 5, 12:02 PM EST, 2 hours 43 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
102 PM EDT WED JUL 05 2006

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0530 PM     TSTM WND DMG     UNIVERSITY PARK         38.97N 76.94W
07/04/2006                   PRINCE GEORGES     MD   COUNTY OFFICIAL

            MANY TREES AND POWERLINES WERE DOWNED DUE TO THUNDERSTORM
            WINDS. SOME TREES FELL ONTO HOMES AND VEHICLES.

&&

MANNING

Local storm report, Jul 5, 12:27 PM EST, 2 hours 18 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
127 PM EDT WED JUL 05 2006

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0320 PM     TSTM WND DMG     5 W WOODBINE            39.36N 77.16W
07/04/2006                   CARROLL            MD   UTILITY COMPANY

            DOWNED TREE KNOCKED POWER OUT FOR 35 RESIDENTS

&&

ROGOWSKI

Local storm report, Jul 5, 12:28 PM EST, 2 hours 17 minutes before

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
128 PM EDT WED JUL 05 2006

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0215 PM     TSTM WND DMG     E HILLSBORO             39.20N 77.72W
07/04/2006                   LOUDOUN            VA   PUBLIC

            SEVERAL TREES DOWN.

0240 PM     TSTM WND DMG     3 SW GERMANTOWN         39.15N 77.30W
07/04/2006                   MONTGOMERY         MD   FIRE DEPT/RESCUE

            TREES AND POWERLINES DOWNED.

0300 PM     TSTM WND DMG     10 E JARRETTSVILLE      39.60N 76.28W
07/04/2006                   HARFORD            MD   UTILITY COMPANY

            TREE DOWN

0320 PM     TSTM WND DMG     5 W WOODBINE            39.36N 77.16W
07/04/2006                   CARROLL            MD   UTILITY COMPANY

            DOWNED TREE KNOCKED POWER OUT FOR 35 RESIDENTS

0330 PM     TSTM WND DMG     STRASBURG               38.99N 78.36W
07/04/2006                   SHENANDOAH         VA   UTILITY COMPANY

            TREES DOWNED POWERLINES

0340 PM     TSTM WND DMG     RELIANCE                39.01N 78.25W
07/04/2006                   WARREN             VA   FIRE DEPT/RESCUE

            TREES DOWNED.

0341 PM     TSTM WND DMG     COCKEYSVILLE            39.48N 76.63W
07/04/2006                   BALTIMORE          MD   FIRE DEPT/RESCUE

            TREE FALLEN ONTO VEHICLE ON I-83 NORTH OF BALTIMORE CITY.

0345 PM     TSTM WND DMG     UPPERVILLE              38.99N 77.89W
07/04/2006                   FAUQUIER           VA   LAW ENFORCEMENT

            TREES AND POWERLINES DOWN.

0350 PM     TSTM WND DMG     3 E BETHEL              39.03N 77.99W
07/04/2006                   CLARKE             VA   FIRE DEPT/RESCUE

            TREES DOWNED

0354 PM     TSTM WND DMG     5 SE BOYCE              39.04N 77.99W
07/04/2006                   CLARKE             VA   EMERGENCY MNGR

            FALLING TREES TOOK DOWN POWERLINES

0430 PM     TSTM WND DMG     3 W MIDDLEBURG          38.97N 77.80W
07/04/2006                   FAUQUIER           VA   TRAINED SPOTTER

            TREE AND POWERLINES DOWN AT JUNCTION OF SAINT LOUIS ROAD
            AND RT. 50

0430 PM     TSTM WND DMG     UPPERVILLE              38.99N 77.89W
07/04/2006                   LOUDOUN            VA   TRAINED SPOTTER

            SEVERAL TREES AND POWERLINES DOWN ON MILLSVILLE ROAD.

0445 PM     TSTM WND DMG     CHEVY CHASE             38.99N 77.07W
07/04/2006                   MONTGOMERY         MD   EMERGENCY MNGR

            NUMEROUS TREES DOWN ACROSS SOUTHERN MONTGOMERY COUNTY

0450 PM     HAIL             HERNDON                 38.97N 77.39W
07/04/2006  E0.75 INCH       FAIRFAX            VA   TRAINED SPOTTER

            3/4 INCH HAIL WAS OBSERVED AT INTERSECTION OF CENTREVILLE
            ROAD AND WEST OX ROAD.

0450 PM     TSTM WND DMG     3 NE WHEATON            39.07N 77.02W
07/04/2006                   MONTGOMERY         MD   TRAINED SPOTTER

            MANY TREES DOWN IN THE NORTHWEST BRANCH PARK.

0455 PM     TSTM WND DMG     OAKTON                  38.89N 77.30W
07/04/2006                   FAIRFAX            VA   PUBLIC

            SEVERAL TREES DOWNED ON OAKTON TERRACE ROAD.

0455 PM     HAIL             CENTREVILLE             38.85N 77.44W
07/04/2006  E1.00 INCH       FAIRFAX            VA   TRAINED SPOTTER

            ONE INCH HAIL REPORTED IN CENTREVILLE BY SKYWARN OBSERVER

0505 PM     TSTM WND DMG     1 S FAIRFAX             38.84N 77.30W
07/04/2006                   CITY OF FAIRFAX    VA   TRAINED SPOTTER

            TREES DOWN AT INTERSECTION OF COLLINHAM AND KAYWOOD COURT
            NEAR ROBINSON HIGH SCHOOL.

0505 PM     TSTM WND DMG     FALLS CHURCH            38.88N 77.17W
07/04/2006                   CITY OF FALLS CHUR VA   LAW ENFORCEMENT

            TREES AND POWER LINES DOWN 300 BLOCK OF WEST COLUMBIA ST

0515 PM     TSTM WND DMG     HUNTLY                  38.83N 78.11W
07/04/2006                   RAPPAHANNOCK       VA   LAW ENFORCEMENT

            NUMEROUS TREES DOWN IN THE HUNTLY AREA.

0515 PM     TSTM WND DMG     ARLINGTON               38.88N 77.10W
07/04/2006                   ARLINGTON          VA   PARK/FOREST SRVC

            TREES DOWN ON GEORGE WASHINGTON PARKWAY

0515 PM     TSTM WND DMG     3 N FAIRFAX             38.89N 77.29W
07/04/2006                   FAIRFAX            VA   TRAINED SPOTTER

            LARGE TREES BLOWN DOWN.

0515 PM     TSTM WND DMG     WASHINGTON              38.91N 77.02W
07/04/2006                   DISTRICT OF COLUMB DC   PARK/FOREST SRVC

            LARGE ELM TREES DOWN ON THE MALL.

0517 PM     TSTM WND DMG     WASHINGTON              38.91N 77.02W
07/04/2006                   DISTRICT OF COLUMB DC   PARK/FOREST SRVC

            TENTS BLOWN DOWN ON THE MALL.

0520 PM     TSTM WND DMG     WHEATON                 39.04N 77.06W
07/04/2006                   MONTGOMERY         MD   NWS EMPLOYEE

            MANY TREES AND POWERLINES DOWNED. REPORT BY NOAA
            EMPLOYEE.

0530 PM     TSTM WND DMG     N UNIVERSITY PARK       38.97N 76.94W
07/04/2006                   PRINCE GEORGES     MD   PUBLIC

            TREES DOWNS IN COLLEGE HEIGHT ESTATES.

0530 PM     NON-TSTM WND DMG WASHINGTON              38.91N 77.02W
07/04/2006                   DISTRICT OF COLUMB DC   FIRE DEPT/RESCUE

            BUILDING COLLASPED DUE TO HIGH WINDS IN SOUTHEAST
            WASHINGTON.

0530 PM     TSTM WND DMG     ALEXANDRIA              38.82N 77.09W
07/04/2006                   CITY OF ALEXANDRIA VA   EMERGENCY MNGR

            SEVERAL TREES DOWNED. DAMAGE TO ONE BUILDING UNDER
            CONSTRUCTION.

0530 PM     TSTM WND DMG     UNIVERSITY PARK         38.97N 76.94W
07/04/2006                   PRINCE GEORGES     MD   COUNTY OFFICIAL

            MANY TREES AND POWERLINES WERE DOWNED DUE TO THUNDERSTORM
            WINDS. SOME TREES FELL ONTO HOMES AND VEHICLES.

0535 PM     TSTM WND DMG     ANNAPOLIS               38.97N 76.50W
07/04/2006                   ANNE ARUNDEL       MD   EMERGENCY MNGR

            20-30 TREES DOWN ON HOUSES.

0538 PM     TSTM WND DMG     BEALETON                38.57N 77.76W
07/04/2006                   FAUQUIER           VA   PUBLIC

            TREES AND POWERLINES DOWN.

0544 PM     TSTM WND DMG     HYBLA VALLEY            38.75N 77.08W
07/04/2006                   FAIRFAX            VA   EMERGENCY MNGR

            TREE DOWN ON GEORGE WASHINGTON PARKWAY

0550 PM     TSTM WND GST     NOKESVILLE              38.70N 77.58W
07/04/2006  E60.00 MPH       PRINCE WILLIAM     VA   PUBLIC

            PEA SIZED HAIL, ROOF DAMAGED, AND ESTIMATED WIND GUSTS TO
            60 MPH 5 SSE OF MANASSAS AIRPORT.

0630 PM     TSTM WND DMG     NANJEMOY                38.45N 77.22W
07/04/2006                   CHARLES            MD   EMERGENCY MNGR

            TREES DOWN

0630 PM     TSTM WND DMG     BRANDYWINE              38.70N 76.85W
07/04/2006                   PRINCE GEORGES     MD   EMERGENCY MNGR

            TRESS DOWN ACROSS SOUTHERN PRINCE GEORGES COUNTY

1045 PM     TSTM WND DMG     MECHANICSVILLE          38.43N 76.73W
07/04/2006                   ST. MARYS          MD   FIRE DEPT/RESCUE

            TREES DOWNED

1055 PM     TSTM WND DMG     CALIFORNIA              38.30N 76.50W
07/04/2006                   ST. MARYS          MD   FIRE DEPT/RESCUE

            TREES DOWNED IN CALIFORNIA AND LEXINGTON PARK.

&&

ROGOWSKI

Local storm report, Jul 5, 12:51 PM EST, 1 hour 54 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
151 PM EDT WED JUL 05 2006

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0514 PM     TSTM WND DMG     ARLINGTON               38.88N 77.10W
07/04/2006                   ARLINGTON          VA   OTHER FEDERAL

            NUMEROUS TREES DOWN IN ARLINGTON NATIONAL CEMETARY

&&

ROGOWSKI

Local storm report, Jul 5, 12:52 PM EST, 1 hour 53 minutes before

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
152 PM EDT WED JUL 05 2006

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0215 PM     TSTM WND DMG     E HILLSBORO             39.20N 77.72W
07/04/2006                   LOUDOUN            VA   PUBLIC

            SEVERAL TREES DOWN.

0240 PM     TSTM WND DMG     3 SW GERMANTOWN         39.15N 77.30W
07/04/2006                   MONTGOMERY         MD   FIRE DEPT/RESCUE

            TREES AND POWERLINES DOWNED.

0300 PM     TSTM WND DMG     10 E JARRETTSVILLE      39.60N 76.28W
07/04/2006                   HARFORD            MD   UTILITY COMPANY

            TREE DOWN

0320 PM     TSTM WND DMG     5 W WOODBINE            39.36N 77.16W
07/04/2006                   CARROLL            MD   UTILITY COMPANY

            DOWNED TREE KNOCKED POWER OUT FOR 35 RESIDENTS

0330 PM     TSTM WND DMG     STRASBURG               38.99N 78.36W
07/04/2006                   SHENANDOAH         VA   UTILITY COMPANY

            TREES DOWNED POWERLINES

0340 PM     TSTM WND DMG     RELIANCE                39.01N 78.25W
07/04/2006                   WARREN             VA   FIRE DEPT/RESCUE

            TREES DOWNED.

0341 PM     TSTM WND DMG     COCKEYSVILLE            39.48N 76.63W
07/04/2006                   BALTIMORE          MD   FIRE DEPT/RESCUE

            TREE FALLEN ONTO VEHICLE ON I-83 NORTH OF BALTIMORE CITY.

0345 PM     TSTM WND DMG     UPPERVILLE              38.99N 77.89W
07/04/2006                   FAUQUIER           VA   LAW ENFORCEMENT

            TREES AND POWERLINES DOWN.

0350 PM     TSTM WND DMG     3 E BETHEL              39.03N 77.99W
07/04/2006                   CLARKE             VA   FIRE DEPT/RESCUE

            TREES DOWNED

0354 PM     TSTM WND DMG     5 SE BOYCE              39.04N 77.99W
07/04/2006                   CLARKE             VA   EMERGENCY MNGR

            FALLING TREES TOOK DOWN POWERLINES

0430 PM     TSTM WND DMG     UPPERVILLE              38.99N 77.89W
07/04/2006                   LOUDOUN            VA   TRAINED SPOTTER

            SEVERAL TREES AND POWERLINES DOWN ON MILLSVILLE ROAD.

0430 PM     TSTM WND DMG     3 W MIDDLEBURG          38.97N 77.80W
07/04/2006                   FAUQUIER           VA   TRAINED SPOTTER

            TREE AND POWERLINES DOWN AT JUNCTION OF SAINT LOUIS ROAD
            AND RT. 50

0445 PM     TSTM WND DMG     CHEVY CHASE             38.99N 77.07W
07/04/2006                   MONTGOMERY         MD   EMERGENCY MNGR

            NUMEROUS TREES DOWN ACROSS SOUTHERN MONTGOMERY COUNTY

0450 PM     HAIL             HERNDON                 38.97N 77.39W
07/04/2006  E0.75 INCH       FAIRFAX            VA   TRAINED SPOTTER

            3/4 INCH HAIL WAS OBSERVED AT INTERSECTION OF CENTREVILLE
            ROAD AND WEST OX ROAD.

0450 PM     TSTM WND DMG     3 NE WHEATON            39.07N 77.02W
07/04/2006                   MONTGOMERY         MD   TRAINED SPOTTER

            MANY TREES DOWN IN THE NORTHWEST BRANCH PARK.

0455 PM     HAIL             CENTREVILLE             38.85N 77.44W
07/04/2006  E1.00 INCH       FAIRFAX            VA   TRAINED SPOTTER

            ONE INCH HAIL REPORTED IN CENTREVILLE BY SKYWARN OBSERVER

0455 PM     TSTM WND DMG     OAKTON                  38.89N 77.30W
07/04/2006                   FAIRFAX            VA   PUBLIC

            SEVERAL TREES DOWNED ON OAKTON TERRACE ROAD.

0505 PM     TSTM WND DMG     1 S FAIRFAX             38.84N 77.30W
07/04/2006                   CITY OF FAIRFAX    VA   TRAINED SPOTTER

            TREES DOWN AT INTERSECTION OF COLLINHAM AND KAYWOOD COURT
            NEAR ROBINSON HIGH SCHOOL.

0505 PM     TSTM WND DMG     FALLS CHURCH            38.88N 77.17W
07/04/2006                   CITY OF FALLS CHUR VA   LAW ENFORCEMENT

            TREES AND POWER LINES DOWN 300 BLOCK OF WEST COLUMBIA ST

0514 PM     TSTM WND DMG     ARLINGTON               38.88N 77.10W
07/04/2006                   ARLINGTON          VA   OTHER FEDERAL

            NUMEROUS TREES DOWN IN ARLINGTON NATIONAL CEMETARY

0515 PM     TSTM WND DMG     WASHINGTON              38.91N 77.02W
07/04/2006                   DISTRICT OF COLUMB DC   PARK/FOREST SRVC

            LARGE ELM TREES DOWN ON THE MALL.

0515 PM     TSTM WND DMG     3 N FAIRFAX             38.89N 77.29W
07/04/2006                   FAIRFAX            VA   TRAINED SPOTTER

            LARGE TREES BLOWN DOWN.

0515 PM     TSTM WND DMG     ARLINGTON               38.88N 77.10W
07/04/2006                   ARLINGTON          VA   PARK/FOREST SRVC

            TREES DOWN ON GEORGE WASHINGTON PARKWAY

0515 PM     TSTM WND DMG     HUNTLY                  38.83N 78.11W
07/04/2006                   RAPPAHANNOCK       VA   LAW ENFORCEMENT

            NUMEROUS TREES DOWN IN THE HUNTLY AREA.

0517 PM     TSTM WND DMG     WASHINGTON              38.91N 77.02W
07/04/2006                   DISTRICT OF COLUMB DC   PARK/FOREST SRVC

            TENTS BLOWN DOWN ON THE MALL.

0520 PM     TSTM WND DMG     WHEATON                 39.04N 77.06W
07/04/2006                   MONTGOMERY         MD   NWS EMPLOYEE

            MANY TREES AND POWERLINES DOWNED. REPORT BY NOAA
            EMPLOYEE.

0530 PM     TSTM WND DMG     N UNIVERSITY PARK       38.97N 76.94W
07/04/2006                   PRINCE GEORGES     MD   PUBLIC

            TREES DOWNS IN COLLEGE HEIGHT ESTATES.

0530 PM     NON-TSTM WND DMG WASHINGTON              38.91N 77.02W
07/04/2006                   DISTRICT OF COLUMB DC   FIRE DEPT/RESCUE

            BUILDING COLLASPED DUE TO HIGH WINDS IN SOUTHEAST
            WASHINGTON.

0530 PM     TSTM WND DMG     UNIVERSITY PARK         38.97N 76.94W
07/04/2006                   PRINCE GEORGES     MD   COUNTY OFFICIAL

            MANY TREES AND POWERLINES WERE DOWNED DUE TO THUNDERSTORM
            WINDS. SOME TREES FELL ONTO HOMES AND VEHICLES.

0530 PM     TSTM WND DMG     ALEXANDRIA              38.82N 77.09W
07/04/2006                   CITY OF ALEXANDRIA VA   EMERGENCY MNGR

            SEVERAL TREES DOWNED. DAMAGE TO ONE BUILDING UNDER
            CONSTRUCTION.

0535 PM     TSTM WND DMG     ANNAPOLIS               38.97N 76.50W
07/04/2006                   ANNE ARUNDEL       MD   EMERGENCY MNGR

            20-30 TREES DOWN ON HOUSES.

0538 PM     TSTM WND DMG     BEALETON                38.57N 77.76W
07/04/2006                   FAUQUIER           VA   PUBLIC

            TREES AND POWERLINES DOWN.

0544 PM     TSTM WND DMG     HYBLA VALLEY            38.75N 77.08W
07/04/2006                   FAIRFAX            VA   EMERGENCY MNGR

            TREE DOWN ON GEORGE WASHINGTON PARKWAY

0550 PM     TSTM WND GST     NOKESVILLE              38.70N 77.58W
07/04/2006  E60.00 MPH       PRINCE WILLIAM     VA   PUBLIC

            PEA SIZED HAIL, ROOF DAMAGED, AND ESTIMATED WIND GUSTS TO
            60 MPH 5 SSE OF MANASSAS AIRPORT.

0630 PM     TSTM WND DMG     BRANDYWINE              38.70N 76.85W
07/04/2006                   PRINCE GEORGES     MD   EMERGENCY MNGR

            TRESS DOWN ACROSS SOUTHERN PRINCE GEORGES COUNTY

0630 PM     TSTM WND DMG     NANJEMOY                38.45N 77.22W
07/04/2006                   CHARLES            MD   EMERGENCY MNGR

            TREES DOWN

1045 PM     TSTM WND DMG     MECHANICSVILLE          38.43N 76.73W
07/04/2006                   ST. MARYS          MD   FIRE DEPT/RESCUE

            TREES DOWNED

1055 PM     TSTM WND DMG     CALIFORNIA              38.30N 76.50W
07/04/2006                   ST. MARYS          MD   FIRE DEPT/RESCUE

            TREES DOWNED IN CALIFORNIA AND LEXINGTON PARK.

&&

ROGOWSKI

The radar

The Sterling radar (KLWX), 35 km away, was scanning. The volume nearest the first event began at 19:44 UTC.

Open the radar archive at this moment

Event by event

4 flash flood. Local standard time, as filed.

Flash Flood, Arlington

When: July 5, 2:45 PM EST to 4:00 PM EST
Where: Arlington County, Arlington
Reported by: BROADCAST MEDIA
Coordinates: 38.879, -77.101 (the zone’s center; the record gives no point)

Route 110 north of the Pentagon was flooded.

Flash Flood, Fairfax

When: July 5, 3:15 PM EST to 4:00 PM EST
Where: Fairfax County, Annandale
Reported by: LAW ENFORCEMENT
Coordinates: 38.835, -77.276 (the zone’s center; the record gives no point)

Prosperity Avenue at Little River Turnpike and Spicewood closed due to flooding.

Flash Flood, Loudoun

When: July 5, 10:00 PM EST to 11:00 PM EST
Where: Loudoun County, Leesburg
Reported by: EMERGENCY MANAGER
Coordinates: 39.091, -77.636 (the zone’s center; the record gives no point)

Lawson Road closed due to flooding.

Flash Flood, Prince William

When: July 6, 4:29 AM EST to 6:00 AM EST
Where: Prince William County, Woodbridge
Reported by: BROADCAST MEDIA
Coordinates: 38.702, -77.478 (the zone’s center; the record gives no point)

US Route 1 closed at Cardinal Drive due to high water.

What these are

Flash Flood: Flooding that begins within six hours of the rain that causes it, or of a dam or levee failure or ice jam release, often with deadly speed.

After NWS Directive 10-1605, the rules offices file Storm Data by.

The same day elsewhere

Every storm in Virginia in 2006 Every state in 2006 This day in weather history Warnings in Virginia, July 2006

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: 5519970, 5519971, 5519972, 5519973.