Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 11, NWS State College, PA
NWS State College, PA issued this severe thunderstorm warning at Jun 30, 1987, 2:56 PM EDT for York County, Pennsylvania. It was in force for 64 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
- Jun 30, 1987, 2:56 PM EDT (18:56 UTC)
- Expired
- Jun 30, 1987, 4:00 PM EDT
- In force
- 64 min
- Issued by
- NWS State College, PA
- Area
- Whole counties
County 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 |
|---|---|---|---|
| Jun 30, 3:03 PM EDT | Thunderstorm Wind 0 | York, PA | |
| Jun 30, 3:25 PM EDT | Thunderstorm Wind 0 | 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
Atlantic City In, NJ (KACY), launched 12:00Z, 6.9 hours before the alert went out and 198 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
- 391 J/kg
- Mixed-layer CIN
- -133 J/kg
- Mixed-layer LCL
- 1242 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 105 m²/s²
- 0-3 km storm-relative helicity
- 121 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, Jun 30, 11:09 AM EDT, 3 hours 47 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE HARRISBURG PA. 1045 AM EDT TUE JUN 30 1987 ...SHOWERS AND THUNDERSTORMS MAY INTERRUPT OUR WARM SUMMER DAY... SHOWERS AND THUNDERSTORMS WILL MOVE ACROSS THE STATE THIS AFTERNOON. SOME THUNDERSTORMS MAY BECOME STRONG AND COULD PRODUCE LOCALLY HEAVY RAIN...AS WELL AS STRONG GUSTY WINDS AND DANGEROUS LIGHTNING. HOT/HUMID TROPICAL AIR ENVELOPES THE STATE. AT THE SAME TIME A VIGOROUS COLD FRONT IS SINKING SOUTH FROM LAKE ERIE. THE APPROACHING COOLER AIR WILL TOUCH OFF SHOWERS AND THUNDERSTORMS IN THE WARM UNSTABLE AIR MASS. RESIDENTS SHOULD BE ALERT FOR DEVELOPING THUNDERSTORMS...ESPECIALLY DURING THE HOTTEST PERIOD OF THE AFTERNOON. THUNDERSTORMS MAY ERUPT AT ANY TIME AS THEY SPREAD RAPIDLY EASTWARD ACROSS THE STATE. SHOWERS AND THUNDERSTORMS ARE ALREADY OCCURRING IN WESTERN PENNSYLVANIA. ENJOY THE WARM AFTERNOON...BUT BE ALERT AND KEEP AN EYE TO THE SKY. STAY TUNED TO YOU8R NOAA WEATHER RADIO...OR TO YOUR LOCAL RADIO OR TELEVISION STATION FOR ANY FURTHER STATEMENTS THAT MAY BE ISSUED BY THE NATIONAL WEATHER SERVICE AS THESE STORMS DEVELOP. LESHKO WSO HARRISBURG
Special weather statement, Jun 30, 2:46 PM EDT, 10 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE HARRISBURG PA. 220 PM EDT TUE JUN 30 1987 ...HEAVY THUNDERSTORMS ARE LOCATED OVER YORK AND ADAMS COUNTY... A VERY STRONG THUNDERSTORM WAS MOVING INTO YORK COUNTY JUST NORTH OF THE CITY OF YORK. THIS STORM MAY BE ACCOMPANIED BY LOCALLY HEAVY RAIN AND STRONG GUSTY WINDS AND SMALL HAIL. ANOTHER STRONG THUNDERSTORM WAS MOVING EAST THROUGH ADAMS COUNTY. THIS STORM WAS LOCATED JUST NORTHWEST OF HANOVER. THESE STORMS HAVE THE POTENTIAL FOR STRONG GUSTY WINDS AND DANGEROUS LIGHTNING. IF THREATENING WEATHER IS SIGHTED...MOVE TO A SAFE PLACE IMMEDIATELY. END LESHKO WSO HARRISBURG
The office that day
Everything else NWS State College, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 30, 4:15 PM EDT | Severe Thunderstorm Warning | CTP | Adams | 65 min |
| Jun 30, 4:33 PM EDT | Severe Thunderstorm Warning | CTP | Berks | 57 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 1987Every severe thunderstorm warning in 1987
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.