Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1993

Severe Thunderstorm Warning 30, NWS State College, PA

June 20, 1993Cumberland County, Dauphin County, Pennsylvania

NWS State College, PA issued this severe thunderstorm warning at Jun 20, 1993, 6:10 PM EDT for Cumberland County, Dauphin County, Pennsylvania. It was in force for 65 min.

The area

The counties it named.

The facts

Issued
Jun 20, 1993, 6:10 PM EDT (22:10 UTC)
Expired
Jun 20, 1993, 7:15 PM EDT
In force
65 min
Issued by
NWS State College, PA
Area
Whole counties

Counties Cumberland County, PA, Dauphin County, PA

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 10.2 hours before the alert went out and 152 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Washington/Dulle, VA at 12:00Z on 1993-06-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 541 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Washington/Dulle, VA at 12:00Z on 1993-06-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 4 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
541 J/kg
Mixed-layer CIN
-115 J/kg
Mixed-layer LCL
993 m above ground
0-6 km bulk shear
7 kt
0-1 km storm-relative helicity
4 m²/s²
0-3 km storm-relative helicity
49 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Jun 20, 5:00 PM EDT, 1 hour 10 minutes before
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Special weather statement, Jun 20, 5:00 PM EDT, 1 hour 10 minutes before
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Special weather statement, Jun 20, 5:03 PM EDT, 1 hour 7 minutes before
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Special weather statement, Jun 20, 5:04 PM EDT, 1 hour 6 minutes before
PAZ006-013-009-008-202200-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HARRISBURG PA
503 PM EDT SUN JUN 20 1993

...SEVERE THUNDERSTORM WATCH FOR THE SUSQUEHANNA REGION AND CENTRAL
MOUNTAINS TILL 9PM...

...SEVERE THUNDERSTORM WARNING FOR FRANKLIN COUNTY UNTIL 545 PM...

AT 500 PM NATIONAL WEATHER SERVICE RADAR IN HARRISBURG SHOWED A LINE OF
SCATTERED THUNDERSTORMS ALONG AND WEST OF A LINE FROM HAZELTON TO
MARTINSBURG WEST VIRGINIA. THE LINE WAS MOVING NORTHEAST AT 25 MILES AN
HOUR.

THE STRONGEST STORMS ON RADAR WERE IN PERRY COUNTY AND SOUTHERN FRANKLIN
COUNTY. THIS STORM HAS PRODUCED DAMAGING WINDS IN NORTHERN MARYLAND.

OTHER STRONG THUNDERSTORMS WERE IN NORTHERN MARYLAND AND WILL LIKELY MOVE
INTO ADAMS COUNTY BY 530 PM.

THE STORM IN PERRY COUNTY... ON ITS CURRENT COURSE AND SPEED... WILL MOVE
INTO NORTHERN DAUPHIN COUNTY BY 530.

GUSTS TO 45 MILES AN HOUR AND SMALL HAIL CAN BE EXPECTED WITH THESE STORMS.

HEAVY RAINFALL WAS ALSO ASSOCIATED WITH THESE STORMS. FLOODING OF POOR
DRAINAGE SYSTEMS IS POSSIBLE.

SEVERE THUNDERSTORMS PRODUCE WIND IN EXCESS OF 58 MILES AN HOUR AND HAIL
GREATER THAN DIME SIZE. IF THREATENING WEATHER APPROACHES SEEK SHELTER
IMMEDVIATELY IN A REINFORCED BUILDING.

FENNER
Special weather statement, Jun 20, 6:00 PM EDT, 10 minutes before
PAZ007-008-014-202300-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WILLIAMSPORT PA
500 PM EDT SUN JUN 20 1993

...SEVERE THUNDERSTORM WATCH UNTIL 900 PM EDT FOR ALL OF NORTHCENTRAL
PENNSYLVANIA...
...THUNDERSTORMS MOVING OUT OF NORTHCENTRAL PENNSYLVANIA...

...WATCH INFORMATION...
A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 900 PM EDT FOR ALL OF
NORTHCENTRAL PENNSYLVANIA.  THE WATCH INCLUDES...BRADFORD...CLINTON
...LYCOMING AND SULLIVAN COUNTIES.  THE WATCH ALSO INCLUDES ALL
COUNTIES IN THE MIDDLE SUSQUEHANNA VALLEY.

...RADAR INFORMATION...
AT 600 PM EDT NATIONAL WEATHER SERVICE RADAR INDICATED AN AREA OF
SHOWERS AND THUNDERSTORMS MOVING INTO EASTERN PENNSYLVANIA. THE
TRAILING EDGE OF THIS AREA OF PRECIPITATION EXTENDED FROM WYLUSING IN
BRADFORD COUNTY TO FRACKVILLE IN SCHUYLKILL COUNTY. OTHER NEW
DEVELOPED THUNDERSTORMS NORTHWEST OF COUDERSPORT AND JUST NORTH OF
EMPORIUM IN POTTER COUNTY. THE THUNDERSTORMS WERE MOVING EAST
NORTHEAST AT 25 MPH.

THE THUNDERSTORMS TO OUR EAST WILL BE MOVING OUT OF NORTHCENTRAL
PENNSYLVANIA BY 630 PM EDT. THE THUNDERSTORMS OVER POTTER COUNTY WILL
BE MOVING INTO TIOGA COUNTY BY 7 PM EDT.

...SAFETY TIPS...
A SEVERE THUNDERSTORM WATCH MEANS SEVERE THUNDERSTORMS ARE POSSIBLE.
SEVERE THUNDERSTORMS CAN DEVELOP SUDDENLY AND SOMETIMES NO ADVANCE
WARNING IS POSSIBLE.  IF THUNDERSTORMS APPROACH...SEEK SHELTER INSIDE
A STRONG BUILDING.  STAY AWAY FROM WINDOWS.  LISTEN TO NOAA WEATHER
RADIO FOR LATER STATEMENTS OR WARNINGS FROM THE NATIONAL WEATHER
SERVICE.

JSN/FJG
Special weather statement, Jun 20, 6:00 PM EDT, 10 minutes before
PAZ007-008-014-202300-

SPECIAL WEATHER STATEMENT...CORRECTION TO TRANSMITION TIME
NATIONAL WEATHER SERVICE WILLIAMSPORT PA
600 PM EDT SUN JUN 20 1993

...SEVERE THUNDERSTORM WATCH UNTIL 900 PM EDT FOR ALL OF NORTHCENTRAL
PENNSYLVANIA...
...THUNDERSTORMS MOVING OUT OF NORTHCENTRAL PENNSYLVANIA...

...WATCH INFORMATION...
A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 900 PM EDT FOR ALL OF
NORTHCENTRAL PENNSYLVANIA.  THE WATCH INCLUDES...BRADFORD...CLINTON
...LYCOMING AND SULLIVAN COUNTIES.  THE WATCH ALSO INCLUDES ALL
COUNTIES IN THE MIDDLE SUSQUEHANNA VALLEY.

...RADAR INFORMATION...
AT 600 PM EDT NATIONAL WEATHER SERVICE RADAR INDICATED AN AREA OF
SHOWERS AND THUNDERSTORMS MOVING INTO EASTERN PENNSYLVANIA. THE
TRAILING EDGE OF THIS AREA OF PRECIPITATION EXTENDED FROM WYLUSING IN
BRADFORD COUNTY TO FRACKVILLE IN SCHUYLKILL COUNTY. OTHER NEW
DEVELOPED THUNDERSTORMS NORTHWEST OF COUDERSPORT AND JUST NORTH OF
EMPORIUM IN POTTER COUNTY. THE THUNDERSTORMS WERE MOVING EAST
NORTHEAST AT 25 MPH.

THE THUNDERSTORMS TO OUR EAST WILL BE MOVING OUT OF NORTHCENTRAL
PENNSYLVANIA BY 630 PM EDT. THE THUNDERSTORMS OVER POTTER COUNTY WILL
BE MOVING INTO TIOGA COUNTY BY 7 PM EDT.

...SAFETY TIPS...
A SEVERE THUNDERSTORM WATCH MEANS SEVERE THUNDERSTORMS ARE POSSIBLE.
SEVERE THUNDERSTORMS CAN DEVELOP SUDDENLY AND SOMETIMES NO ADVANCE
WARNING IS POSSIBLE.  IF THUNDERSTORMS APPROACH...SEEK SHELTER INSIDE
A STRONG BUILDING.  STAY AWAY FROM WINDOWS.  LISTEN TO NOAA WEATHER
RADIO FOR LATER STATEMENTS OR WARNINGS FROM THE NATIONAL WEATHER
SERVICE.

JSN/FJG

The office that day

Everything else NWS State College, PA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 19, 9:31 PM EDTSevere Thunderstorm WarningCTPSullivan29 min
Jun 20, 1:56 PM EDTSevere Thunderstorm WarningCTPCentre64 min
Jun 20, 2:36 PM EDTSevere Thunderstorm WarningCTPLycoming54 min
Jun 20, 4:45 PM EDTSevere Thunderstorm WarningCTPFranklin60 min
Jun 20, 5:15 PM EDTSevere Thunderstorm WarningCTPPerry60 min
Jun 20, 6:36 PM EDTSevere Thunderstorm WarningCTPYork69 min
Jun 20, 6:41 PM EDTFlash Flood WarningCTPDauphin2 hr
Jun 20, 7:05 PM EDTSevere Thunderstorm WarningCTPLancaster55 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 1993Every severe thunderstorm warning in 1993

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.