Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 108, NWS State College, PA
NWS State College, PA issued this severe thunderstorm warning at Jul 9, 1999, 10:00 PM EDT for Columbia County, Montour County, Northumberland County, Pennsylvania. It was in force for 75 min. 2 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
- Jul 9, 1999, 10:00 PM EDT (02:00 UTC)
- Expired
- Jul 9, 1999, 11:15 PM EDT
- In force
- 75 min
- Issued by
- NWS State College, PA
- Area
- Whole counties
Counties Columbia County, PA, Montour County, PA, Northumberland County, PA
The radar
The State College radar (KCCX), 119 km from the middle of the area, began a volume at 02:01 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 9, 10:40 PM EDT | Thunderstorm Wind | Danville, PA | Trees down. |
| Jul 9, 10:50 PM EDT | Thunderstorm Wind | Sunbury, PA | Trees down in Sunbury, Northumberland and Herndon. |
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.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 9, 6:45 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
| Jul 9, 10:00 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Buffalo Intl Airport, NY (KBUF), launched 00:00Z, 2.0 hours before the alert went out and 279 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
- 368 J/kg
- Mixed-layer CIN
- -38 J/kg
- Mixed-layer LCL
- 1260 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 155 m²/s²
- 0-3 km storm-relative helicity
- 155 m²/s²
- Significant tornado parameter
- 0.2
- Supercell composite
- 3.5
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.
NWS State College, PA wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 9, 9:50 PM EDT, 10 minutes earlier.
Area forecast discussion, Jul 9, 9:50 PM EDT, 10 minutes before
CENTRAL PENNSYLVANIA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE STATE COLLEGE PA
950 PM EDT FRI JUL 9 1999
NOT MUCH TIME TONIGHT. LINE OF SEVERE STORMS IS CURRENTLY TRACKING
EAST ACROSS THE CENTRAL COUNTIES. WIDESPREAD TREE DAMAGE HAS BEEN
REPORTED BY JUST ABOUT EVERY COUNTY TO THE WEST OF CTP. WILL END THE
WATCH FOR COUNTIES WEST OF THE ALLEGHENY FRONT AS STORMS ARE ENDING
FROM THERE ON WEST. WATCH IS BEING EXTENDED TO COVER ALL OF THE LOWER 6
SUSQ. ZONES OUT SHORTLY AFTER 10 PM.
.CTP...SEVERE THUNDERSTORM WATCH...CENTRAL COUNTIES UNTIL MIDNIGHT.
SEVERE THUNDERSTORM WATCH...LOWER SUSQ UNTIL 3 AM.
MSEIn the hours before
Special weather statement, Jul 9, 7:21 PM EDT, 2 hours 39 minutes before
PAZ004>006-010>012-017>019-024>028-037-041-042-045-046-049>053- 058-100310- SPECIAL WEATHER STATEMENT - SEVERE THUNDERSTORM WATCH NATIONAL WEATHER SERVICE STATE COLLEGE PA 721 PM EDT FRI JUL 9 1999 ...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR MUCH OF CENTRAL PENNSYLVANIA UNTIL MIDNIGHT... THE WATCH INCLUDES THE FOLLOWING COUNTIES... WARREN...MCKEAN...POTTER...CAMERON...ELK...CLEARFIELD... CAMBRIA...BLAIR...CENTRE...HUNTINGDON...MIFFLIN...JUNIATA... TIOGA...SULLIVAN...LYCOMING...UNION...SNYDER...MONTOUR... NORTHUMBERLAND...COLUMBIA...AND SCHUYLKILL. SEVERE THUNDERSTORMS ARE POSSIBLE IN AND CLOSE THE THE WATCH AREA. REMEMBER...SEVERE THUNDERSTORMS CAN PRODUCE DAMAGING WINDS... LARGE HAIL...DANGEROUS LIGHTNING...AND TORRENTAIL RAIN. REMAIN ALERT FOR RAPID CHANGES IN WEATHER CONDITIONS THIS EVENING. THE STORMS WILL QUICKLY MOVE EASTWARD ACROSS MUCH OF THE REGION BY 10 PM. THE MAJORITY OF THE STORMS WILL ARRIVE IN THE SUSQUEHANNA VALLEY AFTER 10 PM. PERSONS ACROSS THE REGION SHOULD SEEK SHELTER IF WARNINGS ARE ISSUED OR SEVERE WEATHER IS NOTED. LISTEN FOR LATER INFORMATION ON NOAA WEATHER RADIO...OR YOUR FAVORITE TV ...CABLE TV...OR RADIO STATION. .END/ MARTIN
Special weather statement, Jul 9, 7:21 PM EDT, 2 hours 39 minutes before
PAZ004>006-010>012-017>019-024>028-037-041-042-045-046-049>053- 058-100310- SPECIAL WEATHER STATEMENT - SEVERE THUNDERSTORM WATCH NATIONAL WEATHER SERVICE STATE COLLEGE PA 721 PM EDT FRI JUL 9 1999 ...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR MUCH OF CENTRAL PENNSYLVANIA UNTIL MIDNIGHT... THE WATCH INCLUDES THE FOLLOWING COUNTIES... WARREN...MCKEAN...POTTER...CAMERON...ELK...CLEARFIELD... CAMBRIA...BLAIR...CENTRE...HUNTINGDON...MIFFLIN...JUNIATA... TIOGA...SULLIVAN...LYCOMING...UNION...SNYDER...MONTOUR... NORTHUMBERLAND...COLUMBIA...AND SCHUYLKILL. SEVERE THUNDERSTORMS ARE POSSIBLE IN AND CLOSE THE THE WATCH AREA. REMEMBER...SEVERE THUNDERSTORMS CAN PRODUCE DAMAGING WINDS... LARGE HAIL...DANGEROUS LIGHTNING...AND TORRENTAIL RAIN. REMAIN ALERT FOR RAPID CHANGES IN WEATHER CONDITIONS THIS EVENING. THE STORMS WILL QUICKLY MOVE EASTWARD ACROSS MUCH OF THE REGION BY 10 PM. THE MAJORITY OF THE STORMS WILL ARRIVE IN THE SUSQUEHANNA VALLEY AFTER 10 PM. PERSONS ACROSS THE REGION SHOULD SEEK SHELTER IF WARNINGS ARE ISSUED OR SEVERE WEATHER IS NOTED. LISTEN FOR LATER INFORMATION ON NOAA WEATHER RADIO...OR YOUR FAVORITE TV ...CABLE TV...OR RADIO STATION. .END/ MARTIN
Local storm report, Jul 9, 7:28 PM EDT, 2 hours 32 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
728 PM EDT FRI JUL 09 1999
TIME(EDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0410 PM BROCKPORT PA WIND DAMAGE
07/09/99 ELK NUMEROUS TREES DOWN
0412 PM RIDGWAY PA WIND DAMAGE
07/09/99 ELK MANY TREES DOWN ON TOBY
ROAD...IN FOX TOWNSHIP...6
MILES SOUTH OF RIDGWAY.
0415 PM RIDGWAY PA 1 INCH HAIL
07/09/99 ELK QUARTER SIZE HAIL 1 MILE
SOUTH OF RIDGWAY...AT EMA
OFFICE
0440 PM QUEHANNA PA .88 INCH HAIL
07/09/99 CLEARFIELD
0505 PM RENOVO PA 55 MPH TSTM GUST
07/09/99 CLINTON
0515 PM LOCK HAVEN PA WIND DAMAGE
07/09/99 CLINTON TREES AND POWER LINES DOWN
ON SUGAR RUN ROAD IN LOCK
HAVEN
0600 PM LAMAR PA WIND DAMAGE
07/09/99 CLINTON 2 TREES DOWN ALONG ROUTE
64 IN LAMARLocal storm report, Jul 9, 7:28 PM EDT, 2 hours 32 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
728 PM EDT FRI JUL 09 1999
TIME(EDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0410 PM BROCKPORT PA WIND DAMAGE
07/09/99 ELK NUMEROUS TREES DOWN
0412 PM RIDGWAY PA WIND DAMAGE
07/09/99 ELK MANY TREES DOWN ON TOBY
ROAD...IN FOX TOWNSHIP...6
MILES SOUTH OF RIDGWAY.
0415 PM RIDGWAY PA 1 INCH HAIL
07/09/99 ELK QUARTER SIZE HAIL 1 MILE
SOUTH OF RIDGWAY...AT EMA
OFFICE
0440 PM QUEHANNA PA .88 INCH HAIL
07/09/99 CLEARFIELD
0505 PM RENOVO PA 55 MPH TSTM GUST
07/09/99 CLINTON
0515 PM LOCK HAVEN PA WIND DAMAGE
07/09/99 CLINTON TREES AND POWER LINES DOWN
ON SUGAR RUN ROAD IN LOCK
HAVEN
0600 PM LAMAR PA WIND DAMAGE
07/09/99 CLINTON 2 TREES DOWN ALONG ROUTE
64 IN LAMARSpecial weather statement, Jul 9, 8:05 PM EDT, 1 hour 55 minutes before
PAZ004>006-010>012-017>019-024>028-033>036-037-041-042-045-046- 049>053-058-100410- SPECIAL WEATHER STATEMENT - SEVERE THUNDERSTORM WATCH NATIONAL WEATHER SERVICE STATE COLLEGE PA 805 PM EDT FRI JUL 9 1999 ...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR MUCH OF CENTRAL PENNSYLVANIA UNTIL MIDNIGHT... THE WATCH INCLUDES THE FOLLOWING COUNTIES... WARREN...MCKEAN...POTTER...CAMERON...ELK...CLEARFIELD... CAMBRIA...BLAIR...CENTRE...HUNTINGDON...MIFFLIN...JUNIATA... TIOGA...SULLIVAN...LYCOMING...UNION...SNYDER...MONTOUR... NORTHUMBERLAND...COLUMBIA...AND SCHUYLKILL. THE FOLLOWING COUNTIES ARE NOW ALSO INCLUDED... SOMERSET...BEDFORD...FULTON...AND FRANKLIN. SEVERE THUNDERSTORMS ARE POSSIBLE IN AND CLOSE THE THE WATCH AREA. REMEMBER...SEVERE THUNDERSTORMS CAN PRODUCE DAMAGING WINDS... LARGE HAIL...DANGEROUS LIGHTNING...AND TORRENTAIL RAIN. REMAIN ALERT FOR RAPID CHANGES IN WEATHER CONDITIONS THIS EVENING. THE STORMS WILL QUICKLY MOVE EASTWARD ACROSS MUCH OF THE REGION BY 10 PM. THE MAJORITY OF THE STORMS WILL ARRIVE IN THE SUSQUEHANNA VALLEY AFTER 10 PM. PERSONS ACROSS THE REGION SHOULD SEEK SHELTER IF WARNINGS ARE ISSUED OR SEVERE WEATHER IS NOTED. LISTEN FOR LATER INFORMATION ON NOAA WEATHER RADIO...OR YOUR FAVORITE TV ...CABLE TV...OR RADIO STATION. .END/ MARTIN
Special weather statement, Jul 9, 8:05 PM EDT, 1 hour 55 minutes before
PAZ004>006-010>012-017>019-024>028-033>036-037-041-042-045-046- 049>053-058-100410- SPECIAL WEATHER STATEMENT - SEVERE THUNDERSTORM WATCH NATIONAL WEATHER SERVICE STATE COLLEGE PA 805 PM EDT FRI JUL 9 1999 ...A SEVERE THUNDERSTORM WATCH IS IN EFFECT FOR MUCH OF CENTRAL PENNSYLVANIA UNTIL MIDNIGHT... THE WATCH INCLUDES THE FOLLOWING COUNTIES... WARREN...MCKEAN...POTTER...CAMERON...ELK...CLEARFIELD... CAMBRIA...BLAIR...CENTRE...HUNTINGDON...MIFFLIN...JUNIATA... TIOGA...SULLIVAN...LYCOMING...UNION...SNYDER...MONTOUR... NORTHUMBERLAND...COLUMBIA...AND SCHUYLKILL. THE FOLLOWING COUNTIES ARE NOW ALSO INCLUDED... SOMERSET...BEDFORD...FULTON...AND FRANKLIN. SEVERE THUNDERSTORMS ARE POSSIBLE IN AND CLOSE THE THE WATCH AREA. REMEMBER...SEVERE THUNDERSTORMS CAN PRODUCE DAMAGING WINDS... LARGE HAIL...DANGEROUS LIGHTNING...AND TORRENTAIL RAIN. REMAIN ALERT FOR RAPID CHANGES IN WEATHER CONDITIONS THIS EVENING. THE STORMS WILL QUICKLY MOVE EASTWARD ACROSS MUCH OF THE REGION BY 10 PM. THE MAJORITY OF THE STORMS WILL ARRIVE IN THE SUSQUEHANNA VALLEY AFTER 10 PM. PERSONS ACROSS THE REGION SHOULD SEEK SHELTER IF WARNINGS ARE ISSUED OR SEVERE WEATHER IS NOTED. LISTEN FOR LATER INFORMATION ON NOAA WEATHER RADIO...OR YOUR FAVORITE TV ...CABLE TV...OR RADIO STATION. .END/ MARTIN
The office that day
Everything else NWS State College, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 9, 8:00 PM EDT | Severe Thunderstorm Warning | CTP | Elk | 40 min |
| Jul 9, 8:06 PM EDT | Severe Thunderstorm Warning | CTP | Potter | 39 min |
| Jul 9, 8:24 PM EDT | Severe Thunderstorm Warning | CTP | Cameron, Clearfield | 66 min |
| Jul 9, 8:28 PM EDT | Severe Thunderstorm Warning | CTP | Tioga | 62 min |
| Jul 9, 8:47 PM EDT | Severe Thunderstorm Warning | CTP | Cameron, Elk, Potter | 28 min |
| Jul 9, 8:50 PM EDT | Severe Thunderstorm Warning | CTP | Clinton | 70 min |
| Jul 9, 9:00 PM EDT | Severe Thunderstorm Warning | CTP | Centre | 90 min |
| Jul 9, 9:01 PM EDT | Severe Thunderstorm Warning | CTP | Blair, Cambria | 59 min |
| Jul 9, 9:22 PM EDT | Tornado Warning | CTP | Cambria, Clearfield | 23 min |
| Jul 9, 9:28 PM EDT | Severe Thunderstorm Warning | CTP | Huntingdon | 77 min |
| Jul 9, 9:30 PM EDT | Severe Thunderstorm Warning | CTP | Lycoming | 75 min |
| Jul 9, 9:34 PM EDT | Severe Thunderstorm Warning | CTP | Tioga | 26 min |
| Jul 9, 9:39 PM EDT | Severe Thunderstorm Warning | CTP | Sullivan | 66 min |
| Jul 9, 9:40 PM EDT | Tornado Warning | CTP | Centre, Huntingdon | 50 min |
| Jul 9, 9:47 PM EDT | Severe Thunderstorm Warning | CTP | Juniata, Mifflin, Snyder, Union | 73 min |
| Jul 9, 10:04 PM EDT | Severe Thunderstorm Warning | CTP | Clinton | 16 min |
| Jul 9, 10:19 PM EDT | Severe Thunderstorm Warning | CTP | Dauphin, Perry | 86 min |
| Jul 9, 10:50 PM EDT | Severe Thunderstorm Warning | CTP | Lebanon, Schuylkill | 55 min |
| Jul 9, 11:05 PM EDT | Severe Thunderstorm Warning | CTP | Bedford | 40 min |
| Jul 9, 11:28 PM EDT | Severe Thunderstorm Warning | CTP | Cambria, Somerset | 32 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 1999Every severe thunderstorm warning in 1999
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; radar from the NEXRAD Level II archive.