Flooding and Tornado of April 16th, 2011
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Flooding and Tornado of April 16th, 2011
Heavy rain developed along and north of a warm front lifting into Central PA on Saturday morning (the 16th of April).


Surface Map on the morning of Saturday April 16th, 2011


 

The rain quickly amounted to more than an inch over much of Central PA, and a stripe of 3 to 5 inches of rainfall occurred from Gettysburg up through Harrisburg and Shamokin. The water was too much for the streams and creeks. Flash Flooding created a extremely dangerous situation where up to a dozen water-rescues were made by local rescue personnel. Many businesses and homes were flooded across Southeastern PA.


Precipitation Totals 8AM EDT 16 April 2011 - 8AM EDT 17 April 2011


 

River Stage of the Swatara Creek at Hershey, PA
(Note the sharp rise during the afternoon and evening of the 16th)


 

River Stage of the Conodoguinet Creek at Hogestown
(Note the sharp rise during the afternoon and evening of the 16th)


 

 

TORNADO


One tornado occurred, along with many reports of wind damage during the afternoon and early evening. The one tornado occurred just to the west of the City of York, near the West Manchester Mall.
Text Summary

Text Summary


 
NOUS41 KCTP 182022
PNSCTP
PAZ065-190030-

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
422 PM EDT MON APR 18 2011

...TORNADO CONFIRMED ABOUT 2 MILES WEST OF YORK IN YORK COUNTY
PENNSYLVANIA...

LOCATION...2W YORK IN YORK COUNTY PENNSYLVANIA
DATE...APRIL 16 2011
ESTIMATED TIME...8:20 PM EDT
MAXIMUM EF-SCALE RATING...EF-0
ESTIMATED MAXIMUM WIND SPEED...85 MPH
MAXIMUM PATH WIDTH...200 YARDS
PATH LENGTH...JUST UNDER ONE-HALF MILE
BEGINNING LAT/LON...39.967703 / -76.779524
ENDING LAT/LON...39.970876 / -76.771306
FATALITIES...0
INJURIES...2

...SUMMARY...
THE NATIONAL WEATHER SERVICE IN STATE COLLEGE PA HAS NOW CONFIRMED
A TORNADO IN WEST MANCHESTER TOWNSHIP IN YORK COUNTY PENNSYLVANIA
ON APRIL 16 2011.

THE NATIONAL WEATHER SERVICE...ALONG WITH THE YORK COUNTY EMERGENCY
MANAGEMENT AGENCY AND PEMA...CONDUCTED A STORM SURVEY OF WIND DAMAGE
THAT OCCURRED ON THE WEST SIDE OF YORK SATURDAY EVENING. ALTHOUGH AN
INITIAL ASSESSMENT CONCLUDED A MICROBURST HAD OCCURRED...A DETAILED
REVIEW COMPLETED TODAY HAS NOW DETERMINED THAT A SMALL TORNADO
DID TOUCH DOWN IN WEST MANCHESTER TOWNSHIP.

THE TORNADO FIRST TOUCHED DOWN JUST NORTH OF BROUGHER LANE WHERE
DAMAGE TO TREES...WIRES...AND SEVERAL OUT-BUILDINGS OCCURRED. SOME
MINOR DAMAGE TO SEVERAL HOMES ALSO OCCURRED IN THIS AREA. THE TORNADO
DAMAGED A CANOPY ON A GAS STATION AND TWO BILLBOARDS AT THE
CORNER OF CARLISLE ROAD AND BROUGHER LANE AS IT TRAVELED
NORTHEAST. AFTER CROSSING CARLISLE ROAD...MORE TREE DAMAGE WAS
OBSERVED. A SIGNIFICANT PORTION OF A ROOF WAS REMOVED OFF A
BUSINESS AND BLOWN ACROSS BROUGHER LANE NEAR HAVILAND ROAD.

THE TORNADO THEN LIFTED...BUT BRIEFLY TOUCHED DOWN AGAIN AT THE
WEST MANCHESTER MALL. SEVERAL TREES WERE UPROOTED. AT THE MALL
ITSELF...A LARGE 40X40 FOOT SKYLIGHT WAS LIFTED AND BLOWN ACROSS
THE ROOF OF THE MALL...WHERE ADDITIONAL ROOF DAMAGE OCCURRED.

THE TORNADO WAS ABOUT 200 YARDS WIDE AT ITS WIDEST POINT...AND HAD
A TOTAL PATH LENGTH OF JUST UNDER 1/2 MILE. MAXIMUM WINDS WERE
ESTIMATED AT 85 MPH...RATING THE TORNADO AS A HIGH END EF0.

THIS INFORMATION CAN ALSO BE FOUND ON OUR WEBSITE AT WEATHER.GOV/CTP.

FOR REFERENCE...THE ENHANCED FUJITA SCALE CLASSIFIES TORNADOES INTO
THE FOLLOWING CATEGORIES:

EF0...WIND SPEEDS 65 TO 85 MPH.
EF1...WIND SPEEDS 86 TO 110 MPH.
EF2...WIND SPEEDS 111 TO 135 MPH.
EF3...WIND SPEEDS 136 TO 165 MPH.
EF4...WIND SPEEDS 166 TO 200 MPH.
EF5...WIND SPEEDS GREATER THAN 200 MPH.

$$

JUNG




Radar (composite reflectivity) at the initial time of the first Tornado Warning that evening.

Radar (composite reflectivity) at the initial time of the first Tornado Warning that evening.


 

Radar (Storm Relative Motion - SRM (0.5 deg) and Reflectivity - Z (0.5 deg)) at the initial time of the first Tornado Warning that evening. KLWX images on top, KCCX on bottom.

Radar (Storm Relative Motion - SRM (0.5 deg) and Reflectivity - Z (0.5 deg)) at the initial time of the first Tornado Warning that evening. KLWX images on top, KCCX on bottom.


 

KLWX SRM 0002z 17 Apr 2011.

KLWX SRM 0002z 17 Apr 2011.


 

KLWX SRM 0017z 17 Apr 2011.

KLWX SRM 0017z 17 Apr 2011.


 

Map of tornado track

Map of tornado track


 

Map of damage near West Manchester Mall

Map of damage near West Manchester Mall


 

Damage near West Manchester Mall, York, PA -  large tree on house

Damage near West Manchester Mall, York, PA - large tree on house


 

Damage near West Manchester Mall, York, PA - rubber roofing wrapped around a tree.

Damage near West Manchester Mall, York, PA - rubber roofing wrapped around a tree.


 

 
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Page Last Modified: 06 June 2011 22:38:12 UTC
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