647
NOUS41 KPHI 120049
PNSPHI
DEZ001-NJZ015>019-PAZ070-071-101>106-121300-
PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
849 PM EDT SAT JUL 11 2026
...NWS DAMAGE SURVEY FOR THE JULY 11, 2026 THUNDERSTORM WIND
EVENT - UPDATE #1...
UPDATE
UPDATED SUMMARY TO INCLUDE SOME DAMAGE THAT EXTENDED
INTO FAR EASTERN DELAWARE COUNTY.
.SOUTHERN MONTGOMERY COUNTY, FAR EASTERN DELAWARE COUNTY, WEST
PHILADELPHIA, AND SOUTH PHILADELPHIA THUNDERSTORM WIND EVENT...
PEAK WIND ESTIMATED: 60-70 MPH
PATH LENGTH /STATUTE/: 12 MILES
PATH WIDTH /MAXIMUM/: 4-5 MILES
FATALITIES: 0
INJURIES: 0
START DATE: JULY 11, 2026
START TIME: 2:44 PM EDT
START LOCATION: LOWER MARION TOWNSHIP, MONTGOMERY COUNTY,
PA
START LAT/LON: 40.01/-75.28
END DATE: JULY 11, 2026
END TIME: 3:15 PM EDT
END LOCATION: SOUTH PHILADELPHIA, PHILADELPHIA COUNTY,
PA
END LAT/LON: 39.90/-75.15
SUMMARY: A SERIES OF AT LEAST 4 DISTINCT MICROBURSTS WITH
ESTIMATED WIND GUSTS OF 60 TO 70 MPH IMPACTED A NARROW CORRIDOR
ABOUT 4 TO 5 MILES WIDE BEGINNING IN FAR SOUTHERN MONTGOMERY
COUNTY AND CONTINUING SOUTHEASTWARD INTO PORTIONS OF FAR EASTERN
DELAWARE COUNTY, WEST PHILADELPHIA, AND THEN SOUTH PHILADELPHIA.
DOZENS OF REPORTS OF WIDESPREAD WIND DAMAGE TO TREES AND BUILDINGS
HAVE BEEN RECEIVED AND REVIEWED. BASED ON RADAR DATA AND DOZENS
OF PHOTOS AND VIDEOS RECEIVED FROM ACROSS THE AREA BOTH DURING THE
STORM AND THE AFTERMATH, IT HAS BEEN DETERMINED THAT ALL OF THE
WIND DAMAGE OCCURRED FROM SEVERE MICROBURSTS CAUSING STRAIGHT LINE
WIND DAMAGE.
THE FIRST MICROBURST OCCURRED IN LOWER MERION TOWNSHIP IN
SOUTHERN MONTGOMERY COUNTY BEGINNING AROUND 2:44 PM EDT, WHERE
WIDESPREAD TREE DAMAGE HAS BEEN REPORTED. POWER OUTAGES AND
DISRUPTIONS TO SEPTA RAIL SERVICE ALSO OCCURRED IN THIS AREA.
A SECOND MICROBURST OCCURRED STARTING AROUND 2:52 PM EDT IN THE
NORTHERN NEIGHBORHOODS OF WEST PHILADELPHIA, AND CONTINUING
SOUTHEASTWARD. THIS MICROBURST ALSO EXTENDED INTO PORTIONS OF FAR
EASTERN DELAWARE COUNTY, INCLUDING HAVERTOWN, UPPER DARBY
TOWNSHIP, AND YEADON. IN THIS AREA, THERE WERE NUMEROUS REPORTS
OF UPROOTED TREES, INCLUDING MANY HAVING FALLEN ONTO VEHICLES AND
BLOCKING COUNTLESS CITY STREETS. AT LEAST 2 REPORTS OF STRUCTURAL
DAMAGE OCCURRED IN WEST PHILADELPHIA, INCLUDING A PARTIAL BUILDING
COLLAPSE AND ROOF BLOWN OFF OF A BUILDING RESULTING IN
EVACUATIONS OF THE OCCUPANTS.
A THIRD MICROBURST OCCURRED OVER THE WESTERN NEIGHBORHOODS OF
SOUTH PHILADELPHIA BEGINNING AROUND 3:01 PM EDT. SOUTH
PHILADELPHIA EXPERIENCED SIMILAR WIND DAMAGE AS WEST
PHILADELPHIA, WITH NUMEROUS REPORTS OF UPROOTED TREES AND OTHER
TREE DAMAGE BLOCKING CITY STREETS. THERE WAS AT LEAST 1 REPORT OF
A ROOF BLOWN OFF A VACANT BUILDING, WHICH SUBSEQUENTLY CAUSED A
PARTIAL BRICK WALL TO COLLAPSE AND CRUSH A VEHICLE ON THE STREET
BELOW. A FORTH MICROBURST OCCURRED OVER MAINLY INDUSTRIAL AREAS OF
SOUTH PHILADELPHIA BEGINNING AROUND 3:12 PM EDT, IMPACTING AREAS
SUCH AS THE STADIUM DISTRICT AND NAVY YARD. IN THIS AREA, A FEW
REPORTS OF UPROOTED TREES HAVE BEEN RECEIVED.
THE NATIONAL WEATHER SERVICE WOULD LIKE TO THANK OUR EMERGENCY
MANAGEMENT PARTNERS AND SKYWARN SPOTTERS FOR PROVIDING REPORTS TO
ASSIST WITH THIS DAMAGE SURVEY.
NOTE:
THE INFORMATION IN THIS STATEMENT IS PRELIMINARY AND SUBJECT TO
CHANGE PENDING FINAL REVIEW OF THE EVENT AND PUBLICATION IN NWS
STORM DATA.
STAARMANN
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