Alert archive / Pennsylvania / Tornado Warnings in 1991
Tornado Warning 1, NWS State College, PA
NWS State College, PA issued this tornado warning at Jul 7, 1991, 1:22 PM EDT for York County, Pennsylvania. It was in force for 23 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
- Jul 7, 1991, 1:22 PM EDT (17:22 UTC)
- Expired
- Jul 7, 1991, 1:45 PM EDT
- In force
- 23 min
- Issued by
- NWS State College, PA
- Area
- Whole counties
County York County, PA
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 7, 1:50 PM EDT | Thunderstorm Wind 65 | York, 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
Washington/Dulle, VA (KIAD), launched 12:00Z, 5.4 hours before the alert went out and 122 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
- 1279 J/kg
- Mixed-layer CIN
- -100 J/kg
- Mixed-layer LCL
- 1270 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 93 m²/s²
- 0-3 km storm-relative helicity
- 46 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 tornado 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 7, 9:05 AM EDT, 4 hours 17 minutes before
PAZ007-008-014-071400 SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WILLIAMSPORT PA 905 AM EDT SUN JUL 7 1991 ...THUNDERSTORMS CONTINUING TO MOVE ACROSS NORTHCENTRAL PENNSYLVANIA... AT 900 AM EDT...NATIONAL WEATHER SERVICE RADAR INDICATED A FAIRLY SOLID AREA OF SHOWERS AND THUNDERSTORMS COVERING TIOGA AND BRADFORD COUNTIES. EXTENDING OUT OF THAT SOLID AREA WAS A LINE OF SHOWERS AND STRONGER THUNDERSTORMS EXTENDING FROM TOWANDA IN BRADFORD COUNTY THROUGH CENTRAL SULLIVAN COUNTY...SOUTHEAST LYCOMING COUNTY AND INTO SOUTHEAST CENTRE COUNTY. MOST OF THE THUNDERSTORM ACTIVITY WAS DECREASING IN INTENSITY WITH THE STRONGEST THUNDERSTORM LOCATED IN SULLIVAN COUNTY JUST NORTH OF LAPORTE. THESE STORMS WERE PART OF A LARGE AREA OF SHOWERS AND THUNDERSTORMS THAT STRETCHED FROM CENTRAL NEW YORK INTO NORTHWEST AND NORTHCENTRAL PENNSYLVANIA. MOVEMENT OF THE THUNDERSTORMS WAS TOWARD THE EAST AT 40 MPH. HEAVY DOWNPOURS...GUSTY WINDS...AND LIGHTNING WILL ACCOMPANY THESE THUNDERSTORMS AS THEY CONTINUE TO MOVE ACROSS NORTHCENTRAL PENNSYLVANIA THIS SUNDAY MORNING. REMEMBER...ANY THUNDERSTORM CAN BE DANGEROUS. TO PROTECT YOURSELF FROM THE DANGERS OF LIGHTNING...REMAIN INDOORS AND DO NOT USE ELECTRICAL APPLIANCES. HEAVY RAINS CAN FLOOD ROADS QUICKLY...SO DO NOT DRIVE INTO AREAS WHERE WATER COVERS THE ROADWAY. PMG
Special weather statement, Jul 7, 9:19 AM EDT, 4 hours 3 minutes before
PAZ008-013-014-071430- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE HARRISBURG PA 915 AM EDT SUN JUL 7 1991 ...THUNDERSTORMS OVER THE CENTRAL MOUNTAINS AND MIDDLE SUSQUEHANNA VALLEY... AT 910 AM WEATHER SERVICE RADAR IN HARRISBURG SHOWED AN AREA OF THUNDERSTORMS SOME WITH VERY HEAVY RAIN...OVER CENTRE AND EAST UNION COUNTIES. DURING THE NEXT HOUR THE STORMS WILL MOVE INTO THE COUNTIES OF MIFFLIN...SYNDER...AND NORTHUMBERLAND AROUND 1000 AM. THESE THUNDERSTORMS MAY PRODUCE GUSTY WINDS...HAIL...DANGEROUS LIGHTNING... AS WELL AS LOCALLY HEAVY DOWNPOURS. IF THREATENING WEATHER APPROACHES...MOVE INDOORS AND STAY AWAY FROM WINDOWS. LISTEN TO NOAA WEATHER RADIO OR YOUR LOCAL RADIO OR TV FOR POSSIBLE WATCHES OR WARNINGS. WSO HAR CRUZ
Special weather statement, Jul 7, 10:53 AM EDT, 2 hours 29 minutes before
PAZ008-009-013-014-072100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE HARRISBURG PA 1055 AM EDT SUN JUL 7 1991 ...SEVERE THUNDERSTORM WATCH IN EFFECT FOR MUCH OF CENTRAL AND SOUTHERN PENNSYLVANIA UNTIL 500 PM EDT... THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR MUCH OF CENTRAL AND SOUTHERN PENNSYLVANIA. THIS INCLUDES ADAMS...CENTRE...CUMBERLAND ...DAUPHIN...FRANKLIN...FULTON...HUNTINGDON...JUNIATA...MIFFLIN...MONTOUR... NORTHUMBERLAND...PERRY...SYNDER...UNION...AND YORK COUNTIES. THESE THUNDERSTORMS MAY PRODUCE GUSTY WINDS...HAIL...DANGEROUS LIGHTNING... AS WELL AS LOCALLY HEAVY DOWNPOURS. IF THREATENING WEATHER APPROACHES...MOVE INDOORS AND STAY AWAY FROM WINDOWS. REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE WARNINGS. WSO HAR CRUZ
Special weather statement, Jul 7, 11:14 AM EDT, 2 hours 8 minutes before
PAZ007-008-014-071615 SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WILLIAMSPORT PA 1114 AM EDT SUN JUL 07 1991 ...SEVERE THUNDERSTORM WATCH IN EFFECT FOR PORTIONS OF NORTHCENTRAL PENNSYLVANIA UNTIL 500 PM THIS EVENING... THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR SOUTHERN CLINTON AND SOUTHERN LYCOMING COUNTIES UNTIL 500 PM EDT. THIS INCLUDES THE CITIES OF WILLIAMSPORT AND LOCK HAVEN. AT 1105 AM EDT NATIONAL WEATHER SERVICE RADAR SHOWED NUMEROUS SHOWERS AND A FEW THUNDERSTORMS OVER SOUTHERN TIOGA AND BRADFORD COUNTIES... WESTERN SULLIVAN COUNTY...ALMOST ALL OF LYCOMING AND CLINTON COUNTIES...AND PORTIONS OF CENTRE AND CLEARFIELD COUNTIES. THE STRONGEST THUNDERSTORMS WERE IN CENTRE AND CLEARFIELD COUNTIES. THESE THUNDERSTORMS COULD CONTAIN STRONG GUSTY WINDS...DANGEROUS LIGHTNING...HAIL AND LOCALLY HEAVY DOWNPOURS. THESE THUNDERSTORMS WERE MOVING TO THE EAST AT 25 MPH. PERSONS IN AND CLOSE TO THE WATCH AREA ARE ADVISED TO BE ALERT TO LOCAL WEATHER CONDITIONS. IF THREATENING WEATHER APPROACHES...GO TO A SAFE PLACE IMMEDIATELY AND IF INSIDE STAY AWAY FROM WINDOWS. PMG/KJF
Special weather statement, Jul 7, 11:41 AM EDT, 1 hour 41 minutes before
PAZ008-009-013-014-072100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE HARRISBURG PA 1130 AM EDT SUN JUL 7 1991 ...SEVERE THUNDERSTORM WATCH IN EFFECT FOR MUCH OF CENTRAL AND SOUTHERN PENNSYLVANIA UNTIL 500 PM EDT... ...STRONG THUNDERSTORMS OVER WESTERN AND SOUTHEASTERN PENNSYLVANIA... AT 1130 AM WEATHER SERVICE RADAR IN HARRISBURG SHOWED A LINE OF STRONG THUNDERSTORMS WITH HEAVY RAIN EXTENDING THROUGH NORTH ARMSTRONG...NORTH INDIANA ...SOUTH CLEARFIELD...AND WEST CENTRE COUNTY. ANOTHER LINE OF STRONG THUNDERSTORMS WITH HEAVY RAIN EXTENDED THROUGH NORTHAMPTON...EAST READING... EAST LANCASTER...AND SOUTHEAST YORK COUNTIES. THESE THUNDERSTORMS MAY BE ACCOMPANIED BY STRONG DAMAGING WINDS...LARGE HAIL ...TORRENTIAL DOWNPOURS...AND DANGEROUS LIGHTNING. THE THUNDERSTORMS WERE MOVING EAST SOUTHEAST AT 40 MILES AN HOUR. IF YOU SEE ANY SIGNS OF SEVERE WEATHER...GET INDOORS IMMEDIATELY. STAY TUNED TO NOAA WEATHER RADIO...OR YOyUR LOCAL RADIO OR TELEVESION STATION FOR ADDITIONAL STATEMENTS OR POSSIBLE WARNINGS. WSO HAR CRUZ
Special weather statement, Jul 7, 12:15 PM EDT, 1 hour 7 minutes before
PAZ007-008-014-071715 SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WILLIAMSPORT PA 1215 PM EDT SUN JUL 07 1991 ...SEVERE THUNDERSTORM WATCH IN EFFECT FOR PORTIONS OF NORTHCENTRAL PENNSYLVANIA UNTIL 500 PM THIS EVENING... THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR CLINTON AND LYCOMING COUNTIES UNTIL 500 PM EDT. THIS INCLUDES THE CITIES OF WILLIAMSPORT AND LOCK HAVEN. AT 1200 PM EDT NATIONAL WEATHER SERVICE RADAR SHOWED A DIMINISHING LINE OF SHOWERS AND A FEW THUNDERSTORMS STRETCHING INTO CENTRAL PENNSYLVANIA. AT THIS TIME RADAR SHOWED NO THUNDERSTORMS IN NORTHCENTRAL PENNSYLVANIA. STRONG STORMS CONTINUED TO STAY IN THE SOUTHERN HALF OF THE STATE. THE THUNDERSTORMS WERE MOVING EAST AT 30 MPH. PERSONS IN AND CLOSE TO THE WATCH AREA ARE ADVISED TO BE ALERT TO LOCAL WEATHER CONDITIONS. IF THREATENING WEATHER APPROACHES...GO TO A SAFE PLACE IMMEDIATELY...PREFERABLY INDOORS AND AWAY FROM WINDOWSK. PMG/KJF
The office that day
Everything else NWS State College, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 7, 8:54 AM EDT | Severe Thunderstorm Warning | CTP | Centre | 66 min |
| Jul 7, 10:38 AM EDT | Severe Thunderstorm Warning | CTP | Lehigh | 67 min |
| Jul 7, 12:06 PM EDT | Severe Thunderstorm Warning | CTP | Huntingdon, Mifflin | 54 min |
| Jul 7, 12:44 PM EDT | Severe Thunderstorm Warning | CTP | Huntingdon | 31 min |
| Jul 7, 12:56 PM EDT | Severe Thunderstorm Warning | CTP | York | 49 min |
| Jul 7, 1:04 PM EDT | Severe Thunderstorm Warning | CTP | Adams | 26 min |
| Jul 7, 1:45 PM EDT | Severe Thunderstorm Warning | CTP | York | 30 min |
Nearby
Tornado Warnings in Pennsylvania, 1991Every tornado warning in 1991Tornadoes 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.