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| Two tornadoes occurred on June 1st, 2012. Additional thunderstorm wind damge occurred in multiple locations that day, including one area of microburst and gustnado damage in Irvona, Clearfield County. Severe Thunderstorms developed across much of the area during the afternoon. A number of discrete supercells formed over Northern Maryland in the early afternoon and slid northeastward toward a warm front which lay across Central PA roughly from southeast to northwest. The storms moved into the Lower Susquehanna Valley in the mid-afternoon. One of these supercells produced the tornado in York County (around 4:30 PM EDT). A long squall line formed over Western PA and moved steadily eastward through the afternoon and evening. It was along or slightly ahead of this squall line where the damage in Bedford and Clearfield Counties occurred (between 6 and 6:30 PM EDT). See image immediately below. |
Surface conditions, radar, and satellite images from around 4 PM EDT, June 1st, 2012.
EF0 Tornado in North Hopewell Twp (York County)
A SMALL TORNADO HAS BEEN CONFIRMED TO HAVE OCCURRED IN NORTH HOPEWELL TOWNSHIP IN
YORK COUNTY ON JUNE 1st.
LOCATION...NORTH HOPEWELL TOWNSHIP IN YORK COUNTY PENNSYLVANIA
DATE...JUNE 1 2012
ESTIMATED TIME...AROUND 430 PM EDT
MAXIMUM EF- SCALE RATING...EF0
ESTIMATED MAXIMUM WIND SPEED...NEAR 70 MPH
MAXIMUM PATH WIDTH...25 YARDS
PATH LENGTH...75 YARDS
BEGINNING LAT/LON... ENDING LAT/LON...
* FATALITIES...NONE
* INJURIES...NONE
* THE INFORMATION IN THIS STATEMENT IS PRELIMINARY AND SUBJECT TO
CHANGE PENDING FINAL REVIEW OF THE EVENT(S) AND PUBLICATION IN NWS
STORM DATA.
...SUMMARY...
A NATIONAL WEATHER SERVICE SURVEY TEAM INCLUDING THE YORK COUNTY
EMERGENCY MANAGEMENT AGENCY SURVEYED STORM DAMAGE WHICH OCCURRED
NEAR THE INTERSECTION OF LIST ROAD AND ROUTE 24 ABOUT 2 MILES
NORTH OF WINTERSTOWN IN NORTH HOPEWELL TOWNSHIP ON JUNE 1 2012.
A SMALL TORNADO HAD A BRIEF TOUCHDOWN IN THE AREA BLOWING A METAL
ROOF OFF A SINGLE LEVEL HOME AND SPLITTING A NEARBY TREE.
THE SEVERE THUNDERSTORM SPAWNING THE TORNADO MOVED NORTHEASTWARD
ACROSS SOUTHERN YORK COUNTY PRODUCING FUNNEL CLOUDS WHICH WERE
REPORTED AND CAPTURED WITH VISUAL IMAGERY FROM SHREWSBURY
TOWNSHIP INTO CHANCEFORD TOWNSHIP DURING THE LATE AFTERNOON OF
JUNE 1.
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.
Damage in North Hopewell Twp (York County)
Map showing approximate location of damage in North Hopewell Twp
EF0 Tornado near Alum Bank, Bedford County
A TORNADO WAS CONFIRMED TO HAVE OCCURRED NEAR ALUM BANK IN BEDFORD COUNTY.
LOCATION...PLEASANTVILLE (ALUM BANK) IN WEST ST. CLAIRE TOWNSHIP...BEDFORD
COUNTY PENNSYLVANIA
DATE...6/1/2012
ESTIMATED TOUCH DOWN TIME...618 PM EDT
MAXIMUM EF-SCALE RATING...EF0
ESTIMATED MAXIMUM WIND SPEED...70 MPH
MAXIMUM PATH WIDTH...75 YARDS
PATH LENGTH...1 1/2 MILES
BEGINNING LAT/LON...
ENDING LAT/LON...
FATALITIES...0
INJURIES...0
* THE INFORMATION IN THIS STATEMENT IS PRELIMINARY AND SUBJECT TO
CHANGE PENDING FINAL REVIEW OF THE EVENT(S) AND PUBLICATION IN NWS
STORM DATA.
...SUMMARY...
THE NATIONAL WEATHER SERVICE IN STATE COLLEGE PA HAS CONFIRMED A
TORNADO NEAR ALUM BANK IN BEDFORD COUNTY PENNSYLVANIA ON 6/1/2012.
A THUNDERSTORM SPAWNED A SHORT LIVED WEAK TORNADO NEAR ALLUM BANK
IN BEDFORD COUNTY FRIDAY EVENING. THE TORNADO TOUCHED DOWN AT THE
INTERSECTION OF RTE 96 AND GORDON HALL ROAD AND WAS ON THE GROUND
FOR 1 1/2 MILES BEFORE LIFTING OFF AGAIN AT THE INTERSECTION OF
RTE 96 AND TOWNSHIP ROAD T606.
THE TORNADO WAS EMBEDDED WITHIN A LARGER AREA OF STRAIGHT LINE
WINDS. MAXIMUM WINDS WERE ESTIMATED AROUND 70 MPH WHICH DAMAGED A
BARN AND CAUSED MINOR DAMAGE TO 3 OTHER STRUCTURES. APPROXIMATELY
30 TREES WERE ALSO KNOCKED DOWN FROM THE STORM WHICH SEVERAL
WITNESSES REPORTED AS BEING ACCOMPANIED BY WHIRLING CLOUDS AND A
DRIVING RAIN.
Damage in Alum Bank (Bedford County)
Map showing approximate location of damage near Alum Bank
Microburst and Gustnado in Irvona, Clearfield County
A MICROBURST AND GUSTNADO OCCURRED NEAR IRVONA IN CLEARFIELD COUNTY PENNSYLVANIA ON JUNE 1st...
LOCATION...IRVONA IN CLEARFIELD COUNTY PENNSYLVANIA
DATE...06/01/2012
ESTIMATED TIME...6:23 PM EDT
ESTIMATED MAXIMUM WIND SPEED...95 MPH
MAXIMUM PATH WIDTH...50 YARDS
PATH LENGTH...1/4 MILE
BEGINNING LAT/LON...40.79097N / -78.60972
ENDING LAT/LON...40.79351N / -78.60581
* FATALITIES...0
* INJURIES...0
* THE INFORMATION IN THIS STATEMENT IS PRELIMINARY AND SUBJECT TO
CHANGE PENDING FINAL REVIEW OF THE EVENT(S) AND PUBLICATION IN NWS
STORM DATA.
...SUMMARY...
A SURVEY TEAM FROM THE NATIONAL WEATHER SERVICE...WORKING WITH
EMERGENCY MANAGEMENT AND FIRST RESPONDERS...INVESTIGATED DAMAGE
NEAR IRVONA IN CLEARFIELD COUNTY PENNSYLVANIA FROM JUNE 1ST 2012.
THE AREA AFFECTED OCCURRED IN A SMALL VALLEY SETTING. A
MICROBURST BEGAN AT THE CREST OF THE HILL AT THE TOP OF THE
VALLEY...ABOUT 1/4 MILE SOUTHWEST OF SHORTCUT ROAD. CLEAR
EVIDENCE OF DIVERGENT DAMAGE WAS NOTED IN THE PATTERN PRODUCED BY
SEVERAL DOWNED TREES AND A BARN WITH CONSIDERABLE ROOF DAMAGE. AS
THE MICROBURST FUNNELED DOWN THE SMALL VALLEY...WINDS APPEARED TO
ACCELERATED...CAUSING SIGNIFICANT DAMAGE TO A MOBILE HOME. WHEN
WINDS REACHED THE BOTTOM OF THE VALLEY AT SHORTCUT ROAD...IT
ENCOUNTERED A HEAVILY FORESTED AREA. STRONG EVIDENCE EXISTS THAT
THE WINDS SWIRLED AT THE BOTTOM OF THE HILL AS IT ENCOUNTERED THE
STAND OF TREES. WINDS APPEARED TO SWIRL BACK AND ROLL A SECOND
MOBILE HOME WHICH WAS TIED DOWN WITH STRAPS. ABOUT 10 TREES ON THE
EAST SIDE OF SHORTCUT ROAD ALSO WERE DOWNED. THEREFORE IT IS
CONCLUDED THAT A BRIEF GUSTNADO LIKELY WAS CREATED AT THE BOTTOM
OF THE VALLEY BEFORE THE MICROBURST DISSIPATED.
FOR REFERENCE...
A MICROBURST IS A CONVECTIVE DOWNDRAFT WITH AN AFFECTED OUTFLOW AREA
OF LESS THAN 2 1/2 MILES WIDE AND PEAK WINDS LASTING LESS THAN
5 MINUTES. MICROBURSTS MAY INDUCE DANGEROUS HORIZONTAL/VERTICAL
WIND SHEARS...WHICH CAN ADVERSELY AFFECT AIRCRAFT PERFORMANCE AND
CAUSE PROPERTY DAMAGE. A GUSTNADO IS A SWIRLING VORTEX WHICH
SOMETIMES FORMS ON THE EDGE OF STRONG MICROBURSTS. THESE ARE
CAUSED BY A DIFFERENT MECHANISM THAN A TORNADO...AND ARE THEREFORE
CLASSIFIED AS DAMAGING THUNDERSTORM WINDS.
Map showing approximate location of damage in Irvona (Clearfield County)
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