Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1991
Severe Thunderstorm Warning 9, NWS State College, PA
NWS State College, PA issued this severe thunderstorm warning at May 6, 1991, 4:13 PM EDT for Adams County, Cumberland County, Pennsylvania. It was in force for 62 min. 4 reports 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 6, 1991, 4:13 PM EDT (20:13 UTC)
- Expired
- May 6, 1991, 5:15 PM EDT
- In force
- 62 min
- Issued by
- NWS State College, PA
- Area
- Whole counties
Counties Adams County, PA, Cumberland County, PA
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 6, 4:20 PM EDT | Thunderstorm Wind 52 | Cumberland, PA | |
| May 6, 4:30 PM EDT | Thunderstorm Wind 0 | Adams, PA | |
| May 6, 4:55 PM EDT | Thunderstorm Wind 57 | Cumberland, PA | |
| May 6, 5:00 PM EDT | Thunderstorm Wind 0 | Adams, 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, 8.2 hours before the alert went out and 120 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
- 13 J/kg
- Mixed-layer CIN
- -33 J/kg
- Mixed-layer LCL
- 559 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 16 m²/s²
- 0-3 km storm-relative helicity
- 33 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 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 6, 2:02 PM EDT, 2 hours 11 minutes before
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</html>Special weather statement, May 6, 2:40 PM EDT, 1 hour 33 minutes before
PAZ007-008-014-062000- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WILLIAMSPORT PA 240 PM EDT MON MAY 6 1991 ...SEVERE THUNDERSTORM WATCH IN EFFECT FOR NORTHCENTRAL PENNSYLVANIA UNTIL 800 PM EDT... AT 230 PM EDT NATIONAL WEATHER SERVICE RADAR SHOWED A LINE OF SHOWERS AND THUNDERSTORMS EXTENDING FROM ELMIRA NEW YORK TO ALTOONA. HOWEVER...A BAND OF STRONGER STORMS WAS LOCATED IN SOUTHWESTERN PENNSYLVANIA MOVING TO THE NORTHEAST. ANY OF THESE STORMS COULD PRODUCE HEAVY RAIN...STRONG GUSTY WINDS ...HAIL...AND DANGEROUS LIGHTNING AS THEY MOVE INTO NORTHCENTRAL PENNSYLVANIA. REMEMBER A SEVERE THUNDERSTORM WATCH MEANS THAT SEVERE THUNDERSTORMS ARE POSSIBLE IN AND CLOSE TO THE WATCH AREA. STAY TUNED TO NOAA WEATHER RADIO FOR FURTHER INFORMATION AND ANY UPDATES ON THIS SITUATION. KF/TG
Special weather statement, May 6, 3:01 PM EDT, 1 hour 12 minutes before
PA006-008-009-013-061900- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE HARRISBURG PA 255 PM EDT MON MAY 6 1991 ...THUNDERSTORMS ARE MOVING INTO CENTRAL PENNSYLVANIA... AT 245 PM EDT THE NATIONAL WEATHER SERVICE RADAR IN HARRISBURG SHOWED THUNDERSTORMS WITH HEAVY RAIN MOVING INTO CENTRAL PENNSYLVANIA. THE THUNDERSTORMS STRETCHED FROM AROUND STATE COLLEGE SOUTH TO NORTH BEDFORD COUNTY AROUND SAXTON. THE ONE OF THE STRONGEST STORMS WAS JUST NORTH OF HUNTINGDON WHILE ANOTHER STRONG STORM WAS ABOUT 10 MILES SOUTH OF HUNTINGDON. MOVEMENT OF THE STORMS WAS TO THE NORTHEAST AT ABOUT 25 MILES AN HOUR. AT THIS RATE THE STORM WILL STRETCH FROM EAST CENTRE COUNTY TO EAST HUNTINGDON COUNTY BY AROUND 400 PM. THE RADAR ALSO SHOWED SEVERE STORMS IN WEST BEDFORD COUNTY... THESE STORMS WERE ALSO MOVING TO THE NORTHEAST AT ABOUT 25 MILES AN HOUR AND WILL BE MOVING INTO FULTON COUNTY BY AROUND 400 PM EDT. . IF THREATENING WEATHER APPROA4CHES SEEK SHELTER IMMEDIATLY. KEEP IN MIND A SEVERE THUNDERSTORM WARNING IS IN EFFECT UNTIL 800 PM FOR MUCH OF CENTRAL PENNSYLVANIA. WSO HAR RBH
Special weather statement, May 6, 3:06 PM EDT, 1 hour 7 minutes before
PA006-008-009-013-061900- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE HARRISBURG PA 255 PM EDT MON MAY 6 1991 ...THUNDERSTORMS ARE MOVING INTO CENTRAL PENNSYLVANIA... AT 245 PM EDT THE NATIONAL WEATHER SERVICE RADAR IN HARRISBURG SHOWED THUNDERSTORMS WITH HEAVY RAIN MOVING INTO CENTRAL PENNSYLVANIA. THE THUNDERSTORMS STRETCHED FROM AROUND STATE COLLEGE SOUTH TO NORTH BEDFORD COUNTY AROUND SAXTON. THE ONE OF THE STRONGEST STORMS WAS JUST NORTH OF HUNTINGDON WHILE ANOTHER STRONG STORM WAS ABOUT 10 MILES SOUTH OF HUNTINGDON. MOVEMENT OF THE STORMS WAS TO THE NORTHEAST AT ABOUT 25 MILES AN HOUR. AT THIS RATE THE STORM WILL STRETCH FROM EAST CENTRE COUNTY TO EAST HUNTINGDON COUNTY BY AROUND 400 PM. THE RADAR ALSO SHOWED STRONG THUNDERSTORMS IN WEST BEDFORD COUNTY... THESE STORMS WERE ALSO MOVING TO THE NORTHEAST AT ABOUT 25 MILES AN HOUR AND WILL BE MOVING INTO FULTON COUNTY BY AROUND 400 PM EDT. . IF THREATENING WEA:THER APPROACHES SEEK SHELTER IMMEDIATLY. KEEP IN MIND A SEVERE THUNDERSTORM WARNING IS IN EFFECT UNTIL 800 PM FOR MUCH OF CENTRAL PENNSYLVANIA. WSO HAR RBH
Special weather statement, May 6, 3:20 PM EDT, 53 minutes before
PA006-008-009-013-061900- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE HARRISBURG PA 255 PM EDT MON MAY 6 1991 ...THUNDERSTORMS ARE MOVING INTO CENTRAL PENNSYLVANIA... AT 245 PM EDT THE NATIONAL WEATHER SERVICE RADAR IN HARRISBURG SHOWED THUNDERSTORMS WITH HEAVY RAIN MOVING INTO CENTRAL PENNSYLVANIA. THE THUNDERSTORMS STRETCHED FROM AROUND STATE COLLEGE SOUTH TO NORTH BEDFORD COUNTY AROUND SAXTON. THE ONE OF THE STRONGEST STORMS WAS JUST NORTH OF HUNTINGDON WHILE ANOTHER STRONG STORM WAS ABOUT 10 MILES SOUTH OF HUNTINGDON. MOVEMENT OF THE STORMS WAS TO THE NORTHEAST AT ABOUT 25 MILES AN HOUR. AT THIS RATE THE STORM WILL STRETCH FROM EAST CENTRE COUNTY TO EAST HUNTINGDON COUNTY BY AROUND 400 PM. THE RADAR ALSO SHOWED STRONG THUNDERSTORMS IN WEST BEDFORD COUNTY... THESE STORMS WERE ALSO MOVING TO THE NORTHEAST AT ABOUT 25 MILES AN HOUR AND WILL BE MOVING INTO FULTON COUNTY BY AROUND 400 PM EDT. . IF THREATENING WEATHERM APPROACHES SEEK SHELTER IMMEDIATLY. KEEP IN MIND A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 800 PM FOR MUCH OF CENTRAL PENNSYLVANIA. WSO HAR RBH
Special weather statement, May 6, 3:35 PM EDT, 38 minutes before
PAZ007-008-014-062040- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WILLIAMSPORT PA 335 PM EDT MON MAY 6 1991 ...SEVERE THUNDERSTORM WATCH IN EFFECT FOR NORTHCENTRAL PENNSYLVANIA UNTIL 800 PM EDT... AT 330 PM EDT NATIONAL WEATHER SERVICE RADAR SHOWED A LINE OF SHOWERS AND THUNDERSTORMS EXTENDING FROM ELMIRA NEW YORK TO ALTOONA. HOWEVER...A BAND OF STRONGER STORMS STRETCHED FROM BRADFORD THROUGH ALTOONA. ANY OF THESE STORMS COULD PRODUCE HEAVY RAIN...STRONG GUSTY WINDS ...HAIL...AND DANGEROUS LIGHTNING AS THEY MOVE INTO NORTHCENTRAL PENNSYLVANIA. REMEMBER A SEVERE THUNDERSTORM WATCH MEANS THAT SEVERE THUNDERSTORMS ARE POSSIBLE IN AND CLOSE TO THE WATCH AREA. STAY TUNED TO NOAAZ WEATHER RADIO FOR FURTHER INFORMATION AND ANY UPDATES ON THIS SITUATION. KF/TG
The office that day
Everything else NWS State College, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 6, 3:39 PM EDT | Severe Thunderstorm Warning | CTP | Franklin, Fulton, Huntingdon | 51 min |
| May 6, 3:57 PM EDT | Severe Thunderstorm Warning | CTP | Centre | 48 min |
| May 6, 4:13 PM EDT | Severe Thunderstorm Warning | CTP | Juniata, Perry | 62 min |
| May 6, 4:31 PM EDT | Severe Thunderstorm Warning | CTP | Clinton | 59 min |
| May 6, 4:46 PM EDT | Severe Thunderstorm Warning | CTP | Dauphin, York | 59 min |
| May 6, 5:14 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, Lebanon | 46 min |
| May 6, 5:49 PM EDT | Severe Thunderstorm Warning | CTP | Schuylkill | 56 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.