Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1993
Severe Thunderstorm Warning 49, NWS State College, PA
NWS State College, PA issued this severe thunderstorm warning at Jul 29, 1993, 1:55 AM EDT for Lancaster County, York County, Pennsylvania. It was in force for 65 min.
The area
The counties it named.
The facts
- Issued
- Jul 29, 1993, 1:55 AM EDT (05:55 UTC)
- Expired
- Jul 29, 1993, 3:00 AM EDT
- In force
- 65 min
- Issued by
- NWS State College, PA
- Area
- Whole counties
Counties Lancaster County, PA, York County, PA
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 00:00Z, 5.9 hours before the alert went out and 139 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.
- Mixed-layer CAPE
- 1626 J/kg
- Mixed-layer CIN
- -41 J/kg
- Mixed-layer LCL
- 1808 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 67 m²/s²
- 0-3 km storm-relative helicity
- 124 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 3.5
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS1 KHAR 290559 RRA SVRHAR PAC071-133-290700- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE HARRISBURG PA 155 AM EDT THU JUL 29 1993 THE NATIONAL WEATHER SERVICE IN HARRISBURG HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 300 AM EDT FOR PEOPLE IN THE FOLLOWING LOCATION...S... IN SOUTH CENTRAL PENNSYLVANIA ...LANCASTER COUNTY...EASTERN YORK COUNTY AT 145 AM THE HARRISBURG WETHER RARAR SHOWS THUNDERSTORMS IN YORK AND THE WESTERN PORTIONS OF LANCASTER COUNTIES. YORK DIPATCHERS REPORTS MANY TREES AND WIRE DOWN ACORSS MOST OF THE COUNTY. WINDS IN EXCESS OF 50 MPH ARE POSSIBLE IN THSESE THUNDERSTORMS. THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH YOU SHOULD PREPARE FOR DAMAGING WIND IN EXCESS OF 55 MPH...LARGE HAIL...AND DEADLY LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER... PREFERABLY INSIDE A STRONG BUILDING BUT STAY AWAY FROM WINDOWS. &
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, Jul 28, 10:55 PM EDT, 3 hours before
PAZ006-013-014-290500- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE HARRISBURG PA 1055 PM EDT WED JUL 28 1993 ...A FLASH FLOOD WARNING CONTINUES UNTIL 2 AM FOR CLEARFIELD COUNTY... ...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR PORTIONS OF CENTRAL PENNSYLVANIA UNTIL 2 AM... ...A FLASH FLOOD WATCH IS IN EFFECT UNTIL 2 AM FOR ALL OF CENTRAL PENNSYLVANIA... ...WATCH INFORMATION... A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 2 AM FOR THE FOLLOWING COUNTIES ACROSS CENTRAL PENNSYLVANIA: BLAIR...CENTRE...MIFFLIN...FULTON...HUNTINGDON... AND CLEARFIELD. A SEVERE THUNDERSTORM WATCH MEANS THAT CONDITIONS ARE FAVORABLEFOR SEVERE THUNDERSTORM DEVELOPMENT IN AND CLOSE TO THE WATCH AREA. A FLASH FLOOD WATCH MEANS THAT FLASH FLOODING OF WASHES...SMALL STREAMS...RIVERS AND OTHER DRAINAGES IS POSSIBLE IN THE WATCH AREA. ...RADAR INFORMATION... THUNDERSTORMS WITH VERY HEAVY RAIN WERE OVER CENTRE...CLEARFIELD...INDIANA... AND WESTMORELAND COUNTIES. A BAND OF THUNDERSTORMS WITH HEAVY RAIN EXTENDED FROM CENTRE COUNTY SOUTHWESTWARD INTO WESTMORELAND COUNTY IN SOUTHWEST PENNSYLVANIA. OTHER LESS INTENSE RAIN SHOWERS WERE OVER PORTIONS OF WESTERN PENNSYLVANIA...NORTH CENTRAL MOUNTAINS...MIDDLE AND UPPER SUSQUEHANNA VALLEYS AND NORTHEAST PENNSYLVANIA. MOVEMENT WAS TO THE EAST AT 30 MILES AN HOUR. ...SAFETY INFORMATION... A FLASH FLOOD WARNING MEANS FLOODING IS LIKELY OR HAS BEEN REPORTED. STAY ALERT AND WATCH FOR RAPIDLY RISING WATER. BE ESPECIALLY CAUTIOUS AT NIGHT... WHEN IT IS HARDER TO RECOGNIZE THE DANGERS OF FLOOD WATERS. SEVERE THUNDERSTORMS PRODUCE WINDS IN EXCESS OF 58 MILES AN HOUR...HAIL AT LEASTTHREE QUARTERS OF AN INCH IN DIAMETER...VERY HEAVY RAIN...AND DANGEROUS LIGHTNING. MATUSIEWICZ
Special weather statement, Jul 28, 11:00 PM EDT, 2 hours 55 minutes before
PAZ006-013-014-290500- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE HARRISBURG PA 1055 PM EDT WED JUL 28 1993 ...A FLASH FLOOD WARNING CONTINUES UNTIL 2 AM FOR CLEARFIELD COUNTY... ...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR PORTIONS OF CENTRAL PENNSYLVANIA UNTIL 2 AM... ...A FLASH FLOOD WATCH IS IN EFFECT UNTIL 2 AM FOR ALL OF CENTRAL PENNSYLVANIA... ...WATCH INFORMATION... A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 2 AM FOR THE FOLLOWING COUNTIES ACROSS CENTRAL PENNSYLVANIA: BLAIR...CENTRE...MIFFLIN...FULTON...HUNTINGDON... AND CLEARFIELD. A SEVERE THUNDERSTORM WATCH MEANS THAT CONDITIONS ARE FAVORABLEFOR SEVERE THUNDERSTORM DEVELOPMENT IN AND CLOSE TO THE WATCH AREA. A FLASH FLOOD WATCH MEANS THAT FLASH FLOODING OF WASHES...SMALL STREAMS...RIVERS AND OTHER DRAINAGES IS POSSIBLE IN THE WATCH AREA. ...RADAR INFORMATION... THUNDERSTORMS WITH VERY HEAVY RAIN WERE OVER CENTRE...CLEARFIELD...INDIANA... AND WESTMORELAND COUNTIES. A BAND OF THUNDERSTORMS WITH HEAVY RAIN EXTENDED FROM CENTRE COUNTY SOUTHWESTWARD INTO WESTMORELAND COUNTY IN SOUTHWEST PENNSYLVANIA. OTHER LESS INTENSE RAIN SHOWERS WERE OVER PORTIONS OF WESTERN PENNSYLVANIA...NORTH CENTRAL MOUNTAINS...MIDDLE AND UPPER SUSQUEHANNA VALLEYS AND NORTHEAST PENNSYLVANIA. MOVEMENT WAS TO THE EAST AT 30 MILES AN HOUR. ...SAFETY INFORMATION... A FLASH FLOOD WARNING MEANS FLOODING IS LIKELY OR HAS BEEN REPORTED. STAY ALERT AND WATCH FOR RAPIDLY RISING WATER. BE ESPECIALLY CAUTIOUS AT NIGHT... WHEN IT IS HARDER TO RECOGNIZE THE DANGERS OF FLOOD WATERS. SEVERE THUNDERSTORMS PRODUCE WINDS IN EXCESS OF 58 MILES AN HOUR...HAIL AT LEASTTHREE QUARTERS OF AN INCH IN DIAMETE~R...VERY HEAVY RAIN...AND DANGEROUS LIGHTNING. MATUSIEWICZ
Special weather statement, Jul 29, 12:39 AM EDT, 1 hour 16 minutes before
PAZ006-008-009-013-014-290600-
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE HARRISBURG PA
1240 AM EDT THU JUL 29 1993
...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR PORTIONS OF CENTRAL
PENNSYLVANIA UNTIL 2 AM...
...A FLASH FLOOD WATCH IS IN EFFECT UNTIL 2 AM FOR ALL OF CENTRAL
PENNSYLVANIA...
...WATCH INFORMATION...
A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 2 AM FOR THE FOLLOWING COUNTIES
ACROSS CENTRAL PENNSYLVANIA: BLAIR...CENTRE...MIFFLIN...FULTON...HUNTINGDON...
AND CLEARFIELD. A SEVERE THUNDERSTORM WATCH MEANS THAT CONDITIONS ARE FAVORABLEFOR SEVERE THUNDERSTORM DEVELOPMENT IN AND CLOSE TO THE WATCH AREA. A FLASH
FLOOD WATCH MEANS THAT FLASH FLOODING OF WASHES...SMALL STREAMS...RIVERS AND
OTHER DRAINAGES IS POSSIBLE IN THE WATCH AREA.
...RADAR INFORMATION...
AT 1230 AM EDT THE HARRISBURG RADAR WAS SHOWING AN AREA OF RAIN AND
THUNDERSTORMS OVER THE CENTRAL AND SOUTHCENTRAL MOUNTIANS OF PA EAST
ACROSS THE MIDDLE AND UPPER SUSQUEHANNA VALLEY. THIS AREA EXTENDED SOUTH
ACROSS THE PANHANDLE OF WESTERN MARYLAND. HEAVIEST ACTIVITY WAS IN NORTH-
THUNDBERLAND COUNTY, ALSO IN JUNIATA, NORTHERN FRANKLIN AND FULTON COUNTIES.
THE ACTIVITY WILL MOVE INTO THE WESTERN AND NORTHERN AREAS OF THE LOWER
SUSQUEHANNA VALLEY BY 1 AM.
...SAFETY INFORMATION...
A FLASH FLOOD WARNING MEANS FLOODING IS LIKELY OR HAS BEEN REPORTED. ST
AY
ALERT AND WATCH FOR RAPIDLY RISING WATER. BE ESPECIALLY CAUTIOUS AT NIGHT...
WHEN IT IS HARDER TO RECOGNIZE THE DANGERS OF FLOOD WATERS.
SEVERE THUNDERSTORMS PRODUCE WINDS IN EXCESS OF 58 MILES AN HOUR...HAIL AT LEASTTHREE QUARTERS. OF AN INCH IN DIAMETER...VERY HEAVY RAIN...AND DANGEROUS
LIGHTNING.
HURLEYSpecial weather statement, Jul 29, 12:40 AM EDT, 1 hour 15 minutes before
PAZ006-008-009-013-014-290600-
SPECIAL WEATHER STATEMENT AND RADAR SUMMARY
NATIONAL WEATHER SERVICE HARRISBURG PA
1240 AM EDT THU JUL 29 1993
...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR PORTIONS OF CENTRAL
PENNSYLVANIA UNTIL 2 AM...
...A FLASH FLOOD WATCH IS IN EFFECT UNTIL 2 AM FOR ALL OF CENTRAL
PENNSYLVANIA...
...WATCH INFORMATION...
A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 2 AM FOR THE FOLLOWING COUNTIES
ACROSS CENTRAL PENNSYLVANIA: BLAIR...CENTRE...MIFFLIN...FULTON...HUNTINGDON...
AND CLEARFIELD. A SEVERE THUNDERSTORM WATCH MEANS THAT CONDITIONS ARE FAVORABLEFOR SEVERE THUNDERSTORM DEVELOPMENT IN AND CLOSE TO THE WATCH AREA. A FLASH
FLOOD WATCH MEANS THAT FLASH FLOODING OF WASHES...SMALL STREAMS...RIVERS AND
OTHER DRAINAGES IS POSSIBLE IN THE WATCH AREA.
...RADAR INFORMATION...
AT 1230 AM EDT THE HARRISBURG RADAR WAS SHOWING AN AREA OF RAIN AND
THUNDERSTORMS OVER THE CENTRAL AND SOUTHCENTRAL MOUNTIANS OF PA EAST
ACROSS THE MIDDLE AND UPPER SUSQUEHANNA VALLEY. THIS AREA EXTENDED SOUTH
ACROSS THE PANHANDLE OF WESTERN MARYLAND. HEAVIEST ACTIVITY WAS IN NORTH-
THUNDBERLAND COUNTY, ALSO IN JUNIATA, NORTHERN FRANKLIN AND FULTON COUNTIES.
THE ACTIVITY WILL MOVE INTO THE WESTERN AND NORTHERN AREAS OF THE LOWER
SUSQUEHANNA VALLEY BY 1 AM.
...SAFETY INFORMATION...
A FLASH FLOOD WARNING MEANS FLOODING IS LIKELY OR HAS BEEN REPORTED. ST
AY
ALERT AND WATCH FOR RAPIDLY RISING WATER. BE ESPECIALLY CAUTIOUS AT NIGHT...
WHEN IT IS HARDER TO RECOGNIZE THE DANGERS OF FLOOD WATERS.
SEVERE THUNDERSTORMS PRODUCE WINDS IN EXCESS OF 58 MILES AN HOUR...HAIL AT LEASTTHREE QUARTERS OF AN INCH IN DIAMETER...VERY HEAVY RAIN...AND DANGEROUS
LIGHTNING.
HURLEYSpecial weather statement, Jul 29, 1:40 AM EDT, 15 minutes before
PAZ006-008-009-013-014-290600- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE HARRISBURG PA 140 AM EDT THU JUL 29 1993 ...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR PORTIONS OF CENTRAL PENNSYLVANIA UNTIL 2 AM... ...A FLASH FLOOD WATCH IS IN EFFECT UNTIL 2 AM FOR ALL OF CENTRAL PENNSYLVANIA... ...WATCH INFORMATION... A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 2 AM FOR THE FOLLOWING COUNTIES ACROSS CENTRAL PENNSYLVANIA: BLAIR...CENTRE...MIFFLIN...FULTON...HUNTINGDON... AND CLEARFIELD. A SEVERE THUNDERSTORM WATCH MEANS THAT CONDITIONS ARE FAVORABLEFOR SEVERE THUNDERSTORM DEVELOPMENT IN AND CLOSE TO THE WATCH AREA. A FLASH FLOOD WATCH MEANS THAT FLASH FLOODING OF WASHES...SMALL STREAMS...RIVERS AND OTHER DRAINAGES IS POSSIBLE IN THE WATCH AREA. ...RADAR INFORMATION... AT 130 AM EDT THE HARRISBURG RADAR WAS SHOWING AN AREA OF RAIN AND THUNDERSTORMS OVER THE CENTRAL AND SOUTHCENTRAL MOUNTIANS OF PA EAST ACROSS THE MOST OF THE SUSQUEHANNA VALLEY. THIS AREA EXTENDED SOUTH ACROSS THE PANHANDLE OF WESTERN MARYLAND AND WEST VIRGINIA. HEAVIEST ACTIVITY WAS IN YORK AND ADAMS COUNTY. FRANKLIN COUNTY REPORTED STRONG WINDS OF AROUND 50 MPH POSSILBE HIGHER. A BARN WAS BLOWN DOWN IN PETERS TOWNSHIP IN THE MERCERSBURG AREA IN SOUTHERN FRANKLIN COUNTY. 100 HEAD OF CATTLE WERE IN THE BARN. PERSON THROUGH OUT THE AREA CAN EXPECT TO SEE STRONG GUSTY WINDS AHEAD OF THE THUNDERSTORMS AND VIVID LIGHTING AND HEAVY RAIN AS THEY PASS. HURLEY
Special weather statement, Jul 29, 1:43 AM EDT, 12 minutes before
PAZ006-008-009-013-014-290600- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE HARRISBURG PA 140 AM EDT THU JUL 29 1993 ...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR PORTIONS OF CENTRAL PENNSYLVANIA UNTIL 2 AM... ...A FLASH FLOOD WATCH IS IN EFFECT UNTIL 2 AM FOR ALL OF CENTRAL PENNSYLVANIA... ...WATCH INFORMATION... A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 2 AM FOR THE FOLLOWING COUNTIES ACROSS CENTRAL PENNSYLVANIA: BLAIR...CENTRE...MIFFLIN...FULTON...HUNTINGDON... AND CLEARFIELD. A SEVERE THUNDERSTORM WATCH MEANS THAT CONDITIONS ARE FAVORABLEFOR SEVERE THUNDERSTORM DEVELOPMENT IN AND CLOSE TO THE WATCH AREA. A FLASH FLOOD WATCH MEANS THAT FLASH FLOODING OF WASHES...SMALL STREAMS...RIVERS AND OTHER DRAINAGES IS POSSIBLE IN THE WATCH AREA. ...RADAR INFORMATION... AT 130 AM EDT THE HARRISBURG RADAR WAS SHOWING AN AREA OF RAIN AND THUNDERSTORMS OVER THE CENTRAL AND SOUTHCENTRAL MOUNTIANS OF PA EAST ACROSS THE MOST OF THE SUSQUEHANNA VALLEY. THIS AREA EXTENDED SOUTH ACROSS THE PANHANDLE OF WESTERN MARYLAND AND WEST VIRGINIA. HEAVIEST ACTIVITY WAS IN YORK AND ADAMS COUNTY. FRANKLIN COUNTY REPORTED STRONG WINDS OF AROUND 50 MPH POSSILBE HIGHER. A BARN WAS BLOWN DOWN IN PETERS TOWNSHIP IN THE MERCERSBURG AREA IN SOUTHERN FRANKLIN COUNTY. 100 HEAD OF CATTLE WERE IN THE BARN. PERSON THROUGH OUT THE AREA CAN EXPECT TO SEE STRONG GUSTY WINDS AHEAD OF THE THUNDERSTORMS AND VIVID LIGHTING AND HEAVY RAIN AS THEY PASS. HURLEY
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.