Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 45, NWS State College, PA
NWS State College, PA issued this severe thunderstorm warning at Jul 9, 1990, 4:31 PM EDT for Lancaster County, York County, Pennsylvania. It was in force for 44 min. 5 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, 1990, 4:31 PM EDT (20:31 UTC)
- Expired
- Jul 9, 1990, 5:15 PM EDT
- In force
- 44 min
- Issued by
- NWS State College, PA
- Area
- Whole counties
Counties Lancaster County, PA, York County, PA
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 9, 4:45 PM EDT | Thunderstorm Wind 0 | Lancaster, PA | |
| Jul 9, 4:50 PM EDT | Thunderstorm Wind 56 | Lancaster, PA | |
| Jul 9, 4:55 PM EDT | Thunderstorm Wind 0 | York, PA | |
| Jul 9, 4:55 PM EDT | Thunderstorm Wind 0 | York, PA | |
| Jul 9, 5:00 PM EDT | Thunderstorm Wind 0 | Lancaster, 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, 8.5 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
- 318 J/kg
- Mixed-layer CIN
- -125 J/kg
- Mixed-layer LCL
- 1026 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 145 m²/s²
- 0-3 km storm-relative helicity
- 149 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.4
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KHAR 092033 RRA
SVRHAR
PAC071-133-092115-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE HARRISBURG PA
431 PM EDT MON JUL 9 1990
THE NATIONAL WEATHER SERVICE IN HARRISBURG HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 515 PM EDT
FOR PEOPLE IN THE FOLLOWING COUNTIES...
IN SOUTH CENTRAL PENNSYLVANIA
...SOUTHERN LANCASTER...SOUTHEASTERN YORK
AT 430 PM THE HARRISBURG RADAR WAS INDICATIONG A SEVERE THUNDERSTORM
TO THE EAST OF THE CITY OF YORK. THIS STORM WAS MOVING TO THE SOUTHEASTAT ABOUT 30 TO 35 MPH. ON ITS PRESENT TRACK WOULD MOVE INTO THE
EXTREME SOUTHERN PORTIONS OF LANCASTER COUNTY BY 5 PM.
WHEN THUNDERSTORMS ARE OCCURRING...PEOPLE SHOULD MOVE INSIDE A
STRONG BUILDING. DO NOT STAND BY WINDOWS. DON'T USE TELEPHONES
OR ELECTRICAL APPLIANCES UNLESS IN AN EMERGENCY UNTIL THE STORM
HAS PASSED. MOTORISTS SHOULD NOT DRIVE INTO LOW WATER CROSSINGS.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 9, 12:18 PM EDT, 4 hours 13 minutes before
PAZ008-009-013-014-091620- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE HARRISBURG PA. 1215 PM EDT MON JUL 9 1990 ...POSSIBLE THUNDERSTORMS ENTERING THE LOWER SUSQUEHANNA VALLEY... AT 1130 AM WEATHER SERVICE RADAR IN HARRISBURG INDICATED SCATTERED RAINSHOWERS WITH EMBEDDED THUNDERSTORMS...SOME HEAVY... OVER NORTHWESTERN PENNSYLVANIA AND THE NORTHERN MOUNTAINS. THESE THUNDERSTORMS ARE SLOWLY MOVING EAST SOUTHEAST AT 25 MILES AN HOUR AND WILL GRADUALLY CHANGE TO SOUTHEAST THIS AFTERNOON.... ALLOWING THEM TO ENTER INTO THE LOWER SUSQUEHANNA VALLEY JUST AFTER 200 PM EDT. RAINFALL OF 1.50 INCHES HAS BEEN REPORTED OVER TIONESTA SINCE 1000 AM. IN ADDITION...VERY HEAVY RAINS WERE REPORTED IN MEADVILLE. REMEMBER...IF THREATENING WEATHER APPROACHES...SEEK SHELTER IMMEDIATELY. STAY TUNED TO NOAA WEATHER RADIO OR YOUR LOCAL TELEVISION OR RADIO STATION FOR ANY FURTHER UPDATES ON THIS WEATHER SITUATION. WSO HAR VGC
Special weather statement, Jul 9, 1:22 PM EDT, 3 hours 9 minutes before
PAZ008-009-013-014-091730- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE HARRISBURG PA. 120 PM EDT MON JUL 9 1990 ...SEVERE THUNDERSTORM WATCH IN EFFECT UNTIL 900 PM EDT FOR THE LOWER SUSQUEHANNA VALLEY... AT 100 PM THE NATIONAL SEVERE STORMS FORECAST CENTER ISSUED A SEVERE THUNDERSTORM WATCH FOR MUCH OF PENNSYLVANIA TO INCLUDE THE LOWER SUSQUEHANNA VALLEY. PERSONS LIVING IN CENTRE...FULTON...HUNTINGDON...JUNIATA...MIFFLIN... NORTHUMBERLAND...MONTOUR...SYNDER...UNION...ADAMS...CUMBERLAND...DAUPHIN... FRANKLIN...LANCASTER...LEBANON...PERRY...AND YORK COUNTIES SHOULD KEEP AN EYE ON THE SKY FOR THREATENING THUNDERSTORMS...AND LISTEN FOR FORECAST UPDATES AND POSSIBLE WARNINGS ON THE CURRENT WEATHER SITUATION. REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS THAT CONDITIONS ARE FAVORABLE FOR SEVERE THUNDESTORMS IN AND CLOSE TO THE WATCH AREA. IT'S BEST TO TAKE SHELTER INSIDE A STRONG BUILDING AND AWAY FROM GLASS. IF YOU ARE CAUGHT OUTSIDE...BE AWARE THAT LIGHTNING IS AS MUCH A HAZARD AS HIGH WIND. AVOID ISOLATED TREES AND METAL OBJECTS. WSO HAR VGC
Special weather statement, Jul 9, 1:45 PM EDT, 2 hours 46 minutes before
PAZ007-008-014-091845- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WILLIAMSPORT PA 145 PM EDT MON JUL 9 1990 ...SEVERE THUNDERSTORM WATCH IN EFFECT FOR PORTIONS OF NORTHCENTRAL PENNSYLVANIA UNTIL 900 PM THIS EVENING... THE THREAT OF SEVERE THUNDERSTORMS WITH LARGE HAIL...DANGEROUS LIGHTNING AND DAMAGING WINDS WILL EXIST UNTIL 900 PM THIS EVENING FOR LYCOMING...SULLIVAN...AND CLINTON COUNTIES. AT 130 PM NATIONAL WEATHER SERVICE RADAR SHOWED SHOWERS AND THUNDERSTORMS OVER POTTER..CAMERON..CENTER AND CLINTON COUNTIES. THIS AREA OF THUNDERSTORMS EXTENDED WEST TO THE PENNSYLVANIA/OHIO BORDER. NO SEVERE WEATHER HAS AS YET BEEN REPORTED IN NORTHCENTRAL PENNSYLVANIA. PERSONS IN OR CL OSE TO THE SEVERE THUNDERSTORM WATCH AREA ARE ADVISED TO BE ALERT TO LOCAL WEATHER DEVELOPMENTS AND TAKE SHELTER IF THREATENING WEATHER IS SIGHTED. KF/TG/PG
Special weather statement, Jul 9, 2:45 PM EDT, 1 hour 46 minutes before
PAZ007-008-014-091945- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WILLIAMSPORT PA 245 PM EDT MON JUL 9 1990 ...SEVERE THUNDERSTORM WATCH IN EFFECT FOR PORTIONS OF NORTHCENTRAL PENNSYLVANIA UNTIL 900 PM THIS EVENING... THE THREAT OF SEVERE THUNDERSTORMS WITH LARGE HAIL...DANGEROUS LIGHTNING AND DAMAGING WINDS WILL EXIST UNTIL 900 PM THIS EVENING FOR LYCOMING...SULLIVAN...AND CLINTON COUNTIES. AT 235 PM NATIONAL WEATHER SERVICE RADAR SHOWED SHOWERS AND THUNDERSTORMS COVERING MOST OF CENTRAL AND NORTHCENTRAL PENNSYLVANIA. THE HEAVIEST THUNDERSTORMS WERE LOCATED OVER PORTIONS OF CLEARFIELD...CENTRE..AND UNION COUNTIES. THIS AREA OF THUNDERSTORMS EXTENDED WEST TO THE PENNSYLVANIA/OHIO BORDER. THE THUNDERSTORMS WERE MOVING TO THE EAST SOUTHEAST AT ABOUT 40 MILES PER HOUR. PERSONS IN OR CLOSE TO THE SEVERE THUNDERSTORM WATCH AREA ARE ADVISED TO BE ALERT TO LOCAL WEATHER DEVELOPMENTS AND TAKE SHELTER IF THREATENING WEATHER IS nSIGHTED. KF/TG/PG
Special weather statement, Jul 9, 4:05 PM EDT, 26 minutes before
PAZ007-008-014-092105- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WILLIAMSPORT PA 405 PM EDT MON JUL 9 1990 ...THE SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT FOR PORTIONS OF NORTHCENTRAL PENNSYLVANIA UNTIL 900 PM...THIS INCLUDES SOUTHERN LYCOMING AND SOUTHERN CLINTON COUNTIES...IT HAS BEEN CANCELLED FOR NORTHERN LYCOMING...NORTHERN CLINTON...AND ALL OF SULLIVAN COUNTY... AT 400 PM NATIONAL WEATHER SERVICE RADAR SHOWED SHOWERS AND THUNDERSTORMS SOUTH OF A LINE FROM WYALUSING TO DUBOIS. THE HEAVIEST THUNDERSTORMS HAVE MOVED INTO EAST CENTRAL PENNSYLVANIA. THE THUNDERSTORMS WERE MOVING TO THE EAST SOUTHEAST AT ABOUT 40 MILES PER HOUR. PERSONS IN OR CLOSE TO THE SEVERE THUNDERSTORM WATCH AREA ARE ADVISED TO BE ALERT TO LOCAL WEATHER DEVELOPMENTS AND TAKE SHELTER IF THREATENING WEATHER IS SIGHTED. KF/TG/PG
Special weather statement, Jul 9, 4:06 PM EDT, 25 minutes before
PAZ008-009-013-014-092100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE HARRISBURG PA. 405 PM EDT MON JUL 9 1990 ...SEVERE THUNDERSTORM WATCH IN EFFECT UNTIL 900 PM EDT FOR THE LOWER SUSQUEHANNA VALLEY... AT 400 PM THE HARRISBURG RADAR SHOWS THUNDERSTORMS OVER SOUTHERN CUMBERLAND NORTHERN ADAMS AND YORK COUNTIES. THE THUNDERSTORMS HAVE BEEN PRODUCING PEA SIZE HAIL AND GUSTY WINDS TO AOURND 50 MPH. HAM RADIO OPERATORS REPORT THESE CONDITIONS IN SOUTH CUMBERLAND AND NORTHERN ADAMS COUTNIES. PERSONS IN ADAMS AND YORK COUNTIES SHOULD BE ON THE LOOKOUT FOR THESE STORMS BETWEEN 4 AND 6PM. REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS THAT CONDITIONS ARE FAVORABLE FOR SEVERE THUNDESTORMS IN AND CLOSE TO THE WATCH AREA. IT'S BEST TO TAKE SHELTER INSIDE A STRONG BUILDING AND AWAY FROM GLASS. IF YOU ARE CAUGHT OUTSIDE...BE AWARE THAT LIGHTNING IS AS MUCH A HAZARD AS HIGH WIND. AVOID ISOLATED TREES AND METAL OBJECTS. WSO HAR HURLEY
The office that day
Everything else NWS State College, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 9, 1:34 PM EDT | Severe Thunderstorm Warning | CTP | Centre | 41 min |
| Jul 9, 2:04 PM EDT | Severe Thunderstorm Warning | CTP | Centre, Union | 56 min |
| Jul 9, 2:04 PM EDT | Severe Thunderstorm Warning | CTP | Snyder | 56 min |
| Jul 9, 2:42 PM EDT | Severe Thunderstorm Warning | CTP | Centre, Mifflin, Snyder, Union | 48 min |
| Jul 9, 3:09 PM EDT | Severe Thunderstorm Warning | CTP | Carbon, Monroe, Northampton | 66 min |
| Jul 9, 4:07 PM EDT | Severe Thunderstorm Warning | CTP | Northampton | 38 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 1990Every severe thunderstorm warning in 1990
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.