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NOUS41 KLWX 302155
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PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
555 PM EDT FRI JUL 30 2021

...NWS DAMAGE SURVEY FOR 7/29/21 COLUMBIA MD EF0 TORNADO AND 
FALMOUTH VA STRAIGHT LINE WIND EVENT...

* THE INFORMATION IN THIS STATEMENT IS PRELIMINARY AND SUBJECT TO 
  CHANGE PENDING FINAL REVIEW OF THE EVENT(S) AND PUBLICATION IN 
  STORM DATA. 

.COLUMBIA MARYLAND TORNADO...

RATING:                 EF-0
ESTIMATED PEAK WIND:    70 MPH
PATH LENGTH /STATUTE/:  0.3 MILES
PATH WIDTH /MAXIMUM/:   50 YARDS
FATALITIES:             0
INJURIES:               0

START DATE:             JULY 29 2021
START TIME:             5:07 PM EDT
START LOCATION:         COLUMBIA MD / HOWARD COUNTY MD
START LAT/LON:          39.1811 / -76.8219

END DATE:               JULY 29 2021
END TIME:               5:08 PM EDT
END LOCATION:           COLUMBIA MD / HOWARD COUNTY MD
END LAT/LON:            39.1823 / -76.8167

SURVEY SUMMARY:

A BRIEF EF0 TORNADO TOUCHED DOWN LATE THURSDAY AFTERNOON AT THE 
SNOWDEN SQUARE SHOPPING MALL. DAMAGE WAS LIMITED TO A QUARTER-MILE
PATH, AND PEAK WIND GUSTS WERE ESTIMATED TO HAVE BEEN AROUND 70 
MPH. 

INITIAL TREE DAMAGE WAS NOTED IN FRONT OF THE GOODWILL STORE
WHERE TWO ORNAMENTAL TREES WERE SNAPPED AT THEIR BASE. SMALL 
BRANCH AND LEAF LITTER WAS NOTED AS THE TORNADO PASSED OVER THE 
OPEN PARKING LOT TOWARDS A BJS STORE. AS THE TORNADO PASSED OVER 
A BJ'S STORE AND TIRE CENTER, A SECTION OF THE WALL FACADE, 
ESTIMATED ABOUT 50 FEET BY 20 FEET, WAS REMOVED. THE AFFECTED WALL
WAS ON THE OPPOSITE SIDE FROM THE DIRECTION OF STORM MOTION. AN 
EMPLOYEE AT THE TIRE CENTER NOTED THAT NEARBY SHOPPING CARTS WERE 
LOFTED AND THEN RAPIDLY BLOWN TO THE NORTH. THE STORE MANAGER 
NOTED THE TIME OF THE INCIDENT FROM A VIDEO TAKEN IN THE STORE 
SHORTLY AFTER IT HAPPENED. THAT TIME MATCHED THE TIME THAT A TIGHT
TORNADIC CIRCULATION WITH HOOK ECHO WAS NOTED RIGHT OVER THE 
SHOPPING CENTER BY THE NEARBY TBWI TERMINAL DOPPLER RADAR. TBWI 
RADAR HAD A GOOD VIEW OF THE EVENT, AND WAS JUST 10 MILES AWAY AND
SAMPLING ONLY 600 FEET OFF THE GROUND OVER THE SHOPPING CENTER. 

FINAL DAMAGE WAS NOTED TO TWO MORE MID-SIZED TREES AT THE 
END OF SNOWDEN SQUARE DRIVE. LARGE BRANCHES WERE SNAPPED OFF AND 
THROWN IN MULTIPLE DIRECTIONS, NORTH TO SOUTHEAST. TRASH AND 
DEBRIS WAS ALSO NOTED TO HAVE BEEN BLOWN TO THE SOUTHEAST INTO AN 
ADJACENT FIELD. NO FURTHER DAMAGE WAS NOTED PAST THIS POINT. 

THE NATIONAL WEATHER SERVICE THANKS THE HOWARD COUNTY OFFICE OF 
EMERGENCY MANAGEMENT FOR THEIR ASSISTANCE WITH THIS SURVEY.

EF SCALE: THE ENHANCED FUJITA SCALE CLASSIFIES TORNADOES INTO THE
FOLLOWING CATEGORIES:

EF0.........65 TO 85 MPH
EF1.........86 TO 110 MPH
EF2.........111 TO 135 MPH
EF3.........136 TO 165 MPH
EF4.........166 TO 200 MPH
EF5.........>200 MPH

.DAMAGING STRAIGHT-LINE THUNDERSTORM WINDS IN FALMOUTH VA...

ESTIMATED PEAK WIND 90 MPH
PATH LENGTH /STATUTE/: 12 MILES
PATH WIDTH /MAXIMUM/:  1.5 MILES 
FATALITIES:             0
INJURIES:               0

START DATE:             JULY 29 2021
START TIME:             5:13 PM EDT
START LOCATION:         HARTWOOD, VA / STAFFORD COUNTY VA 
START LAT/LON:          38.4425 / -77.5756

END DATE:               JULY 29 2021
END TIME:               5:33 PM EDT
END LOCATION:           FREDERICKSBURG, VA / STAFFORD COUNTY VA 
END LAT/LON:            38.3089 / -77.4337

SURVEY SUMMARY: 

A SURVEY TEAM FROM THE NATIONAL WEATHER SERVICE WEATHER FORECAST 
OFFICE IN STERLING, VA DETERMINED THAT DAMAGING STRAIGHT LINE WINDS 
OCCURRED WITH A SUPERCELL THUNDERSTORM ON THURSDAY, JULY 29TH 2021, 
BETWEEN 513-533 PM EDT IN WESTERN AND SOUTHERN STAFFORD COUNTY.

TREE DAMAGE WAS FIRST REPORTED AROUND STONY HILL ROAD AND LEGACY 
LANE IN HARTWOOD VA. THE MOST CONCENTRATED DAMAGE WAS AROUND 
TRUSLOW ROAD WHERE MANY TREES WERE UPROOTED AND SOME TREE TRUNKS 
WERE SNAPPED. IT WAS ESTIMATED THAT 50 TO 100 TREES WERE SNAPPED, 
UPROOTED, AND DAMAGED IN THE AREA. MULTIPLE TREES FELL ONTO TWO 
HOUSES AROUND TRUSLOW ROAD AND MELVIN DRIVE. ANOTHER TREE FELL 
ONTO A HOUSE ALONG WORSHAM LANE. TREE DAMAGE WAS ALSO OBSERVED 
ALONG BEAGLE ROAD, WORSHAM LANE, LIMERICK LANE, AND KELLEY ROAD. 
THE TREE DAMAGE WAS FACING FROM NORTH-NORTHWEST TO SOUTH- 
SOUTHEAST, INDICATING THAT WINDS WERE MOVING IN A STRAIGHT LINE 
INSTEAD OF ROTATING. THE MAXIMUM WIND GUSTS IN THE HARDEST HIT 
AREAS WERE LIKELY AROUND 90 MPH.

A TREE WAS UPROOTED ALONG VERNON STREET AND THERE WAS ALSO TREE 
DAMAGE ALONG GAYLE STREET. 

ISOLATED TREE DAMAGE CONTINUED SOUTHEAST IN THE VICINITY OF US 17 
TOWARD THE RAPPAHANNOCK RIVER. TWO SEPARATE TREES FELL ONTO TWO 
HOUSES ALONG PHILLIPS STREET. 

STAFFORD COUNTY EMERGENCY MANAGEMENT REPORTED A TOTAL OF ELEVEN 
HOUSES CONSIDERED AFFECTED FROM TREE DAMAGE AND THAT ONE HOUSE WAS 
DETERMINED TO BE DESTROYED AROUND TRUSLOW ROAD AND MELVIN DRIVE. 

AN EYEWITNESS ACCOUNT WAS TAKEN FROM A RESIDENT ON VERNON STREET 
WHERE THE RESIDENT INDICATED THAT THE WIND WAS CONSTANT FROM ONE 
DIRECTION, NORTH-NORTHWEST TO SOUTH-SOUTHEAST, WHICH LINES UP WITH 
HOW THE TREE DAMAGE WAS FACING. WINDS WERE DURING WHITE OUT 
CONDITIONS.

WE CONTINUE TO COLLECT INFORMATION FROM THIS AREA, INCLUDING DRONE 
FOOTAGE STILL BEING COLLECTED BY THE COUNTY. ADDITIONAL EVIDENCE 
FROM WITHIN THIS LARGE PATH OF DAMAGE MAY YET FIND EVIDENCE OF 
TORNADIC ACTIVITY AS WELL. BUT THE ABOVE REPRESENTS WHAT WE KNOW AT 
THIS TIME.

THE NATIONAL WEATHER SERVICE THANKS THE STAFFORD COUNTY EMERGENCY 
MANAGEMENT AND THE SHERRIFF'S OFFICE FOR THEIR ASSISTANCE ON THIS 
SURVEY.

$$
CS/BKF/BJL

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