Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 113, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 24, 2002, 4:32 PM EDT for Montgomery County, Pennsylvania. It was in force for 43 min. 1 report 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 24, 2002, 4:32 PM EDT (20:32 UTC)
- Expired
- Jun 24, 2002, 5:15 PM EDT
- In force
- 43 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Whole counties
County Montgomery County, PA
The radar
The Philadelphia radar (KDIX), 86 km from the middle of the area, began a volume at 20:33 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 |
|---|---|---|---|
| Jun 24, 4:50 PM EDT | Thunderstorm Wind 50 E | Narberth, 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.
The nearest sounding before it
Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 8.5 hours before the alert went out and 103 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
- 9 J/kg
- Mixed-layer CIN
- -263 J/kg
- Mixed-layer LCL
- 1468 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 106 m²/s²
- 0-3 km storm-relative helicity
- 90 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS51 KPHI 242032 SVRPHI PAC091-242115- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MOUNT HOLLY NJ ISSUED BY NWS NEW YORK NY 432 PM EDT MON JUN 24 2002 THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SOUTH CENTRAL MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA * UNTIL 515 PM EDT. * AT 422 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM NEAR CONSHOHOCKEN...MOVING SOUTH AT 15 MPH. * THE SEVERE THUNDERSTORM WILL BE IN THE VICINITY OF... NARBERTH AROUND 445 PM. SOME OTHER LOCATIONS IN THE WARNING INCLUDE WEST CONSHOHOCKEN. IF SEVERE WEATHER APPROACHES YOUR AREA...GO INSIDE A STURDY SHELTER. REMEMBER...A SEVERE THUNDERSTORM CAN PRODUCE DAMAGING WINDS IN EXCESS OF 55 MPH...LARGE DAMAGING HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. $$ REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN MOUNT HOLLY NJ. LAT...LON 4014 7520 4015 7544 3997 7527 3996 7524
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 24, 4:38 PM EDT | Severe Thunderstorm Warning | PHI | Philadelphia | 22 min |
| Jun 24, 5:10 PM EDT | Severe Thunderstorm Warning | PHI | Montgomery | 50 min |
| Jun 24, 5:15 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 30 min |
| Jun 24, 5:36 PM EDT | Severe Thunderstorm Warning | PHI | Philadelphia | 24 min |
| Jun 24, 5:45 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery, Philadelphia | 15 min |
| Jun 24, 6:18 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware | 42 min |
| Jun 24, 7:22 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 23 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2002Every severe thunderstorm warning in 2002
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.