Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 10, NWS State College, PA
NWS State College, PA issued this severe thunderstorm warning at Feb 12, 1999, 12:33 PM EST for Cumberland County, Franklin County, Perry County, Pennsylvania. It was in force for 57 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
- Feb 12, 1999, 12:33 PM EST (17:33 UTC)
- Expired
- Feb 12, 1999, 1:30 PM EST
- In force
- 57 min
- Issued by
- NWS State College, PA
- Area
- Whole counties
Counties Cumberland County, PA, Franklin County, PA, Perry County, PA
The radar
The State College radar (KCCX), 98 km from the middle of the area, began a volume at 17:34 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 |
|---|---|---|---|
| Feb 12, 12:45 PM EST | Thunderstorm Wind | Mercersburg, PA | Trees were blown down on wires along Tuscarora Ridge. |
| Feb 12, 1:09 PM EST | Thunderstorm Wind | West Fairview, PA | Trees and wires down. |
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 nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 5.6 hours before the alert went out and 135 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 628 m above ground
- 0-6 km bulk shear
- 58 kt
- 0-1 km storm-relative helicity
- 273 m²/s²
- 0-3 km storm-relative helicity
- 353 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.
NWS State College, PA wrote its last area forecast discussion before this severe thunderstorm warning went out at Feb 12, 9:38 AM EST, 2 hours 55 minutes earlier.
Area forecast discussion, Feb 12, 9:38 AM EST, 2 hours 55 minutes before
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Special weather statement, Feb 12, 10:45 AM EST, 1 hour 48 minutes before
PAZ028-035-036-050>053-056>059-063>066-122115- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE STATE COLLEGE PA 1045 AM EST FRI FEB 12 1999 ...SEVERE THUNDERSTORMS ARE POSSIBLE OVER SOUTHEAST PENNSYLVANIA THIS AFTERNOON... A STRONG COLD FRONT WILL PUSH INTO SOUTHEAST PENNSYLVANIA THIS AFTERNOON. VERY WARM AND UNSTABLE AIR...STREAMING NORTHWARD AHEAD OF THE FRONT...WILL RESULT IN SHOWERS AND SCATTERED THUNDERSTORMS THIS AFTERNOON. ANY THUNDERSTORMS THAT FORM ALONG THE COLD FRONT WILL MOVE RAPIDLY TO THE EAST...AND HAVE THE POTENTIAL FOR CREATING DAMAGING GUSTS OVER 55 MPH. STAY TUNED TO NOAA WEATHER RADIO...OR YOUR FAVORITE SOURCE OF NATIONAL WEATHER INFORMATION VIA CABLE TELEVISION OR COMMERCIAL RADIO...FOR LATER STATEMENTS...NOWCASTS...AND POSSIBLE WATCHES OR WARNINGS ASSOCIATED WITH THIS WEATHER SITUATION. .END/ FITZGERALD FURTHER WEATHER INFORMATION CAN BE OBTAINED VIA THE INTERNET AT HTTP://BOOKEND.MET.PSU.EDU (ALL LOWER CASE).
The office that day
Everything else NWS State College, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 12, 2:50 PM EST | Severe Thunderstorm Warning | CTP | York | 60 min |
| Feb 12, 2:56 PM EST | Severe Thunderstorm Warning | CTP | Lancaster | 59 min |
| Feb 12, 3:58 PM EST | Severe Thunderstorm Warning | CTP | Lancaster | 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.