Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1991
Severe Thunderstorm Warning 21, NWS State College, PA
NWS State College, PA issued this severe thunderstorm warning at May 29, 1991, 4:19 PM EDT for Clinton County, Pennsylvania. It was in force for 56 min. 1 report came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- May 29, 1991, 4:19 PM EDT (20:19 UTC)
- Expired
- May 29, 1991, 5:15 PM EDT
- In force
- 56 min
- Issued by
- NWS State College, PA
- Area
- Whole counties
County Clinton County, PA
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 29, 4:26 PM EDT | Thunderstorm Wind 0 | Clinton, PA |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.
The nearest sounding before it
Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 8.3 hours before the alert went out and 208 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
- 65 J/kg
- Mixed-layer CIN
- -205 J/kg
- Mixed-layer LCL
- 1163 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 186 m²/s²
- 0-3 km storm-relative helicity
- 216 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KIPT 292019 SVRIPT PAC035-292115- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE WILLIAMSPORT PA 419 PM EDT WED MAY 29 1991 THE NATIONAL WEATHER SERVICE IN WILLIAMSPORT HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 515 PM EDT FOR PEOPLE IN THE FOLLOWING LOCATIONS... IN NORTH CENTRAL PENNSYLVANIA ...CLINTON COUNTY SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55 MPH...DESTRUCTsIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD. PMG/TG NNNN
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, May 29, 2:24 PM EDT, 1 hour 55 minutes before
PAZ007-008-014-292030- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WILLIAMSPORT PA 224 PM EDT WED MAY 29 1991 ...SEVERE THUNDERSTORM WATCH IN EFFECT UNTIL 700 PM EDT FOR PORTIONS OF NORTHCENTRAL PENNSYLVANIA... THE NATIONAL WEATHER SERVICED HAS ISSUED A SEVERE THUNDERSTORM WATCH EFFECTIVE UNTIL 700 PM EDT FOR PARTS OF NORTHCENTRAL PENNSYLVANIA. THIINCLUDES PORTIONS OF CLINTON...LYCOMING...BRADFORD AND TIOGA COUNTIES. AT 215 PM EDT NATIONAL WEATHER SERVICE RADAR WAS SHOWING VERY STRONG THUNDERSTORMS OVER NORHERN CLINTON AND LYCOMING COUNTIES. THE STRONGEST THUNDERSTORMS WERE ALONG THE NORTHCENTRAL CLINTON-TIOGA COUNTIES BORDER AND NEAR CEDAR RUN IN NORTHERN LYCOMING COUNTY. THE THUNDERSTORMS WERE MOVING TO THE SOUTHEAST AT 40 MPH. THESE THUNDERSTORMS WILL CARRY DANGEROUS LIGHTNING...HEAVY RAIN...GUSTY WINDS AND POSSIBLE HAIL WITH THEM. ANYONE THAT IS IN THE PATH OF THESE STORMS OR OBSERVES THREATENING WEATHER SHOULD TAKE SHELTER. PMG/TG NNNN
Special weather statement, May 29, 2:30 PM EDT, 1 hour 49 minutes before
PAZ007-008-014-292030- SPECIAL WEATHER STATEMENT...CORRECTION... NATIONAL WEATHER SERVICE WILLIAMSPORT PA 224 PM EDT WED MAY 29 1991 ...SEVERE THUNDERSTORM WATCH IN EFFECT UNTIL 700 PM EDT FOR PORTIONS OF NORTHCENTRAL PENNSYLVANIA... THE NATIONAL WEATHER SERVICED HAS ISSUED A SEVERE THUNDERSTORM WATCH EFFECTIVE UNTIL 700 PM EDT FOR PARTS OF NORTHCENTRAL PENNSYLVANIA. THIS INCLUDES PORTIONS OF CLINTON...LYCOMING...BRADFORD AND TIOGA COUNTIES. AT 215 PM EDT NATIONAL WEATHER SERVICE RADAR WAS SHOWING VERY STRONG THUNDERSTORMS OVER NORHERN CLINTON AND LYCOMING COUNTIES. THE STRONGEST THUNDERSTORMS WERE ALONG THE NORTHCENTRAL CLINTON-TIOGA COUNTIES BORDER AND NEAR CEDAR RUN IN NORTHERN LYCOMING COUNTY. THE THUNDERSTORMS WERE MOVING TO THE SOUTHEAST AT 40 MPH. THESE THUNDERSTORMS WILL CARRY DANGEROUS LIGHTNING...HEAVY RAIN...GUSTY WINDS AND POSSIBLE HAIL WITH THEM. ANYONE THAT IS IN THE PATH OF THESE STORMS OR OBSERVES THREATENING WEATHER SHOULD TAKE SHELTER. PMG/TG NNNN
Special weather statement, May 29, 2:45 PM EDT, 1 hour 34 minutes before
PAZ004-006-007-013-014-291945- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE HARRISBURG PA. 235 PM EDT WED MAY 29 1991 ...THUNDERSTORMS WERE MOVING THROUGH PORTIONS OF WESTERN AND NORTHERN PENNSYLVANIA... AT 230 PM RADAR SHOWED SCATTERED THUNDERSTORMS FROM NEAR PITTSBURGH... NORTHEAST THO NORTH OF WILLIAMSPORT. OTHER THUNDERSTORMS WERE OVER THE LAUREL HIGHLANDS AND SOUTH CENTRAL MOUNTAINS IN SOUTHERN PENNSYLVANIA. THE STORMS COULD PRODUCE HEAVY RAIN...HAIL...STRONG GUSTY WINDS AND DANGEROUS LIGHTNING. THE STORMS TO THE SOUTH ALSO REACHED SOUTH INTO WESTERN MARYLAND WHERE SOME MARBLE SIZE HAIL WAS REPORTED EARLIER. THESE STORMS WERE MOVING MAINLY EAST TO SOUTHEAST AROUND 25 MPH. PERSONS IN THESE AREAS AND ADJACENT AREAS TO THE EAST SOUTHEAST SHOULD BE ALERT FOR THE PASSAGE OF THE STORMS. IF THREATENING WEATHER APPROACHES GO TO A SAFE PLACE. WSO HAR JORDAN
Special weather statement, May 29, 3:31 PM EDT, 48 minutes before
PAZ006-007-008-013-014-292015- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE HARRISBURG PA. 320 PM EDT WED MAY 29 1991 ...THUNDERSTORMS CONTINUE ACROSS PORTIONS OF WESTERN AND CENTRAL PENNSYLVANIA... AT 320 PM RADAR SHOWED SCATTERED THUNDERSTORMS FROM NEAR PITTSBURGH... NORTHEAST TO SOUTH AND EAST OF WILLIAMSPORT. SOME OF THESE THUNDERSTORMS WERE PRODUCING HEAVY RAIN...STRONG GUSTY WINDS...DANGEROUS LIGHTNING AND POSSIBLY SMALL HAIL. WE HAVE RECEIVED A REPORT THAT HEAVY RAIN AND STRONG WINDS WERE OCCURRING IN NORTHERN UNION AND NORTHERN NORTHUMBERLAND COUNTIES. OTHER THUNDERSTORMS WERE OVER PORTIONS OF THE SOUTH CENTRAL MOUNTAINS... MAINLY IN FULTON AND FRANKLIN COUNTIES. THESE THUNDERSTORMS WERE MOVING MAINLY TO THE EAST SOUTHEAST AROUND 25 MPH. . PERSONS IN THESE AREAS AND ADJACENT AREAS TO THE EAST AND SOUTHEAST SHOULD BE ALERT FOR THE PASSAGE OF THESE STORMS. IF THREATENING APPROACHES GO TO A SAFE PLACE. WSO HAR JORDAN
Special weather statement, May 29, 3:50 PM EDT, 29 minutes before
PAZ006-008-009-013-292030- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE HARRISBURG PA 348 PM EDT WED MAY 29 1991 ...THUNDERSTORMS CONTINUE TO MOVE THROUGH PARTS OF CENTRAL AND WESTERN PENNSYLVANIA... AT 330 PM THE NATIONAL WEATHER SERVICE RADAR IN HARRISBURG SHOWED STRONG THUNDERSTORMS MOVING THROUGH CENTRAL PENNSYLVANIA. ONE OF THE STRONG STORMS WAS IN SOUTHWEST FULTON COUNTY ABOUT 15 MILES WEST OF MERCERSBURG. THE RADAR SHOWED ANOTHER STRONG STORM IN SOUTHERN CENTRE COUNTY ABOUT 15 MILES SOUTHEAST OF STATE COLLEGE...AND ANOTHER STRONG STORM IN SOUTHERN CLINTON COUNTY ABOUT 20 MILES SOUTHWEST OF WILLIAMSPORT. THE STORMS WERE MOVING TO THE SOUTHEAST AT ABOUT 25 MILES AN HOUR. AT THIS RATE THE STORM IN FULTON COUNTY WILL BE MOVING INTO MARYLAND BY ABOUT 415 PM. THE STORM IN SOUTHERN CENTRE COUNTY WILL BE ABOUT 10 MILES EAST OF HUNTINGDON BY 445 PM AND THE STORM IN CLINTON COUNTY WILL PUSH ACROSS UNION COUNTY AND BE ABOUT 5 MILES EAST OF SELINSGROVE BY 445 PM. . SOME OF THE STORMS HAVE ALREADY PRODUCED SMALL HAIL...GUSTY WINDS AND HEAVY DOWNPOURS. IF YOU SEE THREATENING WEATHER APPROACH YOU SHOULD SEEK SHELTER IMMEDIATELY. WSO HAR RBH
The office that day
Everything else NWS State College, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 29, 2:40 PM EDT | Severe Thunderstorm Warning | CTP | Lycoming | 65 min |
| May 29, 3:17 PM EDT | Severe Thunderstorm Warning | CTP | Clinton | 43 min |
| May 29, 4:39 PM EDT | Severe Thunderstorm Warning | CTP | Juniata, Perry, Snyder | 66 min |
| May 29, 5:14 PM EDT | Severe Thunderstorm Warning | CTP | Berks | 31 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 1991Every severe thunderstorm warning in 1991
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.