Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 73, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 1, 2001, 4:06 PM EDT for Northampton County, Pennsylvania. It was in force for 39 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
- Jul 1, 2001, 4:06 PM EDT (20:06 UTC)
- Expired
- Jul 1, 2001, 4:45 PM EDT
- In force
- 39 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Whole counties
County Northampton County, PA
The radar
The Philadelphia radar (KDIX), 118 km from the middle of the area, began a volume at 20:07 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 |
|---|---|---|---|
| Jul 1, 4:25 PM EDT | Thunderstorm Wind 52 E | Hellertown, PA | |
| Jul 1, 4:27 PM EDT | Hail 0.75 | Bethlehem, 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 1, 12:00 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 8.1 hours before the alert went out and 206 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
- 301 J/kg
- Mixed-layer CIN
- -117 J/kg
- Mixed-layer LCL
- 1284 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 104 m²/s²
- 0-3 km storm-relative helicity
- 132 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.8
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS51 KPHI 012007 SVRPHI NJC037-041-PAC095-012045- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 406 PM EDT SUN JUL 1 2001 THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHAMPTON COUNTY IN EASTERN PENNSYLVANIA. WARREN COUNTY IN NORTHWEST NEW JERSEY. SUSSEX COUNTY IN NORTHWEST NEW JERSEY. * UNTIL 445 PM EDT. * AT 357 PM EDT...A TRAINED WEATHER SPOTTER REPORTED A SEVERE THUNDERSTORM JUST EXITING MONROE COUNTY WITH TREES AND POWER LINES DOWN. THIS LINE WILL AFFECT MOST OF NORTHAMPTON... WARREN AND SUSSEX COUNTIES. ITS MOVING EAST AT 30 MPH. * SEVERE THUNDERSTORMS WILL BE NEAR... SUSSEX AT 415 PM. BELVIDERE...NEWTON...VERNON VALLEY AT 425 PM. FRANKLIN AT 430 PM. FOR THE LATEST STORM INFORMATION...PLEASE TUNE TO NOAA WEATHER RADIO...YOUR LOCAL RADIO OR TELEVISION STATION...OR YOUR CABLE TELEVISION OUTLET. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM SUNDAY EVENING FOR NORTHWESTERN NEW JERSEY. A SEVERE THUNDERSTORM WATCH ALSO REMAINS IN EFFECT UNTIL 600 PM SUNDAY EVENING FOR NORTHWESTERN NEW JERSEY AND EASTERN PENNSYLVANIA. $$
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 30, 10:53 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 52 min |
| Jul 1, 1:09 PM EDT | Severe Thunderstorm Warning | PHI | Monroe | 36 min |
| Jul 1, 1:20 PM EDT | Severe Thunderstorm Warning | PHI | Carbon | 25 min |
| Jul 1, 1:26 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 64 min |
| Jul 1, 2:03 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Lehigh | 42 min |
| Jul 1, 2:44 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Northampton | 61 min |
| Jul 1, 4:35 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Montgomery | 40 min |
| Jul 1, 5:15 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 45 min |
| Jul 1, 5:15 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Montgomery | 45 min |
| Jul 1, 6:31 PM EDT | Severe Thunderstorm Warning | PHI | Philadelphia | 29 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 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; radar from the NEXRAD Level II archive.