Monsoons Return to the Southwest U.S.; Potential Atlantic Tropical System Interaction

In Arizona and New Mexico, heavy to excessive rainfall from monsoon thunderstorms may bring isolated flash and urban flooding Thursday into Sunday. The close proximity of Tropical Storm Humberto and a tropical wave (AL94) could lead to interaction between them, and details of their long-range track and intensity forecasts, and any potential impacts, are more uncertain than usual. Read More >

Overview

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. The one tornado occurred just to the west of the City of York, near the West Manchester Mall.


Surface Map on the morning of Saturday April 16, 2011	Precipitation Totals 8 AM EDT 16 April 2011 - 8 AM EDT 17 April 2011	Damaging near West Manchester Mall, York, PA - rubber roofing wrapped around a tree

Tornado
River Stage Levels

Tornadoes:

Tornado - York
York County

Date	April 16, 2011
Time (Local)	8:20 PM EDT
EF Rating	EF-0
Est. Peak Winds	85 MPH
Path Length	Under 1/2 mile
Max Width	200 yards
Injuries/Deaths	2 injuries... 0 fatalities
Summary: 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.

Track Map

Downloadable KMZ File

The Enhanced Fujita (EF) Scale classifies tornadoes into the following categories:

EF0 Weak 65-85 mph	EF1 Moderate 86-110 mph	EF2 Significant 111-135 mph	EF3 Severe 136-165 mph	EF4 Extreme 166-200 mph	EF5 Catastrophic 200+ mph