Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 42, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 13, 2002, 3:21 PM EDT for Montgomery County, Pennsylvania. It was in force for 24 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- May 13, 2002, 3:21 PM EDT (19:21 UTC)
- Expired
- May 13, 2002, 3:45 PM EDT
- In force
- 24 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 19:20 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.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| May 13, 1:30 PM EDT | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 7.4 hours before the alert went out and 224 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
- 313 J/kg
- Mixed-layer CIN
- -110 J/kg
- Mixed-layer LCL
- 1186 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 117 m²/s²
- 0-3 km storm-relative helicity
- 127 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
WUUS51 KPHI 131921
SVRPHI
PAC091-131945-
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
321 PM EDT MON MAY 13 2002
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
NORTHWESTERN MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA.
* UNTIL 345 PM EDT.
* AT 320 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM... OVER GILBERTSVILLE...MOVING NORTHEAST AT 45
MPH.
* THE SEVERE THUNDERSTORM WILL BE NEAR...
EAST GREENVILLE AT 330 PM.
A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA. REMEMBER...
SEVERE THUNDERSTORMS CAN PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE
WARNING. THIS AS THE SAME PARENT THUNDERSTORM THAT THE TORNADO
WARNING WAS ISSUED FOR BERKS COUNTY.
FOR THE LATEST STORM INFORMATION...PLEASE TUNE TO NOAA WEATHER
RADIO...YOUR LOCAL RADIO OR TELEVISION STATION...OR YOUR CABLE
TELEVISION OUTLET.
$$
LAT...LON 4032 7563 4022 7566 4031 7538 4039 7544
4042 7553
TFGThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 13, 2:18 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 42 min |
| May 13, 2:41 PM EDT | Severe Thunderstorm Warning | PHI | Montgomery | 34 min |
| May 13, 3:02 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 28 min |
| May 13, 3:08 PM EDT | Tornado Warning | PHI | Berks | 37 min |
| May 13, 3:08 PM EDT | Tornado Warning | PHI | Berks | 112 min |
| May 13, 3:25 PM EDT | Flash Flood Warning | PHI | Berks | 95 min |
| May 13, 4:40 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 65 min |
| May 13, 4:57 PM EDT | Flash Flood Warning | PHI | Berks | 2 hr |
| May 13, 5:03 PM EDT | Severe Thunderstorm Warning | PHI | Montgomery | 42 min |
| May 13, 5:16 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 39 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.