Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 42, NWS State College, PA
NWS State College, PA issued this severe thunderstorm warning at Jul 9, 1990, 2:42 PM EDT for 4 counties in Pennsylvania. It was in force for 48 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, 1990, 2:42 PM EDT (18:42 UTC)
- Expired
- Jul 9, 1990, 3:30 PM EDT
- In force
- 48 min
- Issued by
- NWS State College, PA
- Area
- Whole counties
Counties Centre County, PA, Mifflin County, PA, Snyder County, PA, Union 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, 2:59 PM EDT | Thunderstorm Wind 0 | Mifflin, PA | |
| Jul 9, 3:00 PM EDT | Thunderstorm Wind 0 | Snyder, 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, 6.7 hours before the alert went out and 207 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 091845 RRA
SVRHAR
PAC027-087-109-119-091930-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE HARRISBURG PA
242 PM EDT MON JUL 9 1990
THE NATIONAL WEATHER SERVICE IN HARRISBURG HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 330 PM EDT
FOR PEOPLE IN THE FOLLOWING COUNTIES...
IN CENTRAL PENNSYLVANIA
...CENTRE...MIFFLIN...SNYDER...UNION
AT 235 PM EDT WEATHER SERVICE RADAR IN HARRISBURG INDICATED A LINE OF
THUNDERSTORMS WITH HAIL EXTENDING FROM ARMSTRONG COUNTY IN WESTERN
PENNSYLVANIA TO CENTRE COUNTY IN THE NORTH CENTRAL MOUNTAINS. PEA SIZE
HAIL HAS BEEN REPORTED ALONG WITH THESE STORMS AND NUMEROUS REPORTS
HAVE BEEN RECEIVED BY THE NATIONAL WEATHER SERVICE IN HARRISBURG OF
DOWNED TREES AND POWER LINES IN CENTRE AND CLEARFIELD COUNTIES.
THE THUNDERSTORMS CONTINUE MOVING EAST SOUTHEAST AT 25 MILES AN HOUR.
IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER FROM THE WEATHER IN A
SToRONG BUILDING. DAMAGING WIND...LARGE HAIL...VERY HEAVY RAIN...
AND DEADLY LIGHTNING ARE ALL POSSIBLE IN SEVERE THUNDERSTORMS.
STAY INSIDE AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED.
WSO HAR CRUZWhat 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, 2 hours 24 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, 1 hour 20 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, 57 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
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, 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 |
| Jul 9, 4:31 PM EDT | Severe Thunderstorm Warning | CTP | Lancaster, York | 44 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.