Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 37, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 11, 2001, 10:22 PM EDT for Chester County, Delaware County, Pennsylvania; New Castle County, Delaware. It was in force for 53 min. 4 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 11, 2001, 10:22 PM EDT (02:22 UTC)
- Expired
- Jun 11, 2001, 11:15 PM EDT
- In force
- 53 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Whole counties
Counties New Castle County, DE, Chester County, PA, Delaware County, PA
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jun 11, 10:25 PM EDT | Thunderstorm Wind 50 E | Kennett Square, PA | |
| Jun 11, 10:30 PM EDT | Thunderstorm Wind 50 E | Countywide, PA | |
| Jun 11, 10:30 PM EDT | Thunderstorm Wind 50 E | Yorklyn, DE | |
| Jun 11, 10:35 PM EDT | Hail 0.88 | Wilmington, DE |
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 00:00Z, 2.4 hours before the alert went out and 183 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
- 2046 J/kg
- Mixed-layer CIN
- -10 J/kg
- Mixed-layer LCL
- 1306 m above ground
- 0-6 km bulk shear
- 33 kt
- 0-1 km storm-relative helicity
- 95 m²/s²
- 0-3 km storm-relative helicity
- 200 m²/s²
- Significant tornado parameter
- 1.1
- Supercell composite
- 10.2
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS51 KPHI 120222 SVRPHI DEC003-PAC029-045-120315- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 1022 PM EDT MON JUN 11 2001 THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHERN NEW CASTLE COUNTY IN NORTHERN DELAWARE. CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA. DELAWARE COUNTY IN SOUTHEAST PENNSYLVANIA. * UNTIL 1115 PM EDT. * AT 1020 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM NEAR KENNETT SQUARE...MOVING SOUTHEAST AT 15 MPH. * SOME LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE... SWARTHMORE... KENNETT SQUARE... DREXEL HILL... WILMINGTON... TALLEYVILLE... ELSMERE... LARGE HAIL...DAMAGING WINDS...AND HEAVY RAINFALL ARE LIKELY WITH THIS STORM. TAKE COVER IN A STURDY BUILDING UNTIL THE STORM HAS PASSED. $$ LAT...LON 3991 7578 3984 7582 3970 7555 3995 7528 IOVINO
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 11, 9:00 PM EDT | Severe Thunderstorm Warning | PHI | Monroe | 45 min |
| Jun 11, 10:15 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 45 min |
| Jun 12, 6:45 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 60 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2001Severe Thunderstorm Warnings in Delaware, 2001Every severe thunderstorm warning in 2001
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.