Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2007
Severe Thunderstorm Warning 67, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 12, 2007, 3:20 PM EDT for Bucks County, Montgomery County, Philadelphia County, Pennsylvania. It was in force for 40 min. 3 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Jun 12, 2007, 3:20 PM EDT (19:20 UTC)
- Expired
- Jun 12, 2007, 4:00 PM EDT
- In force
- 40 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Counties, with a storm outline in the text
Counties Bucks County, PA, Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 67 km from the middle of the area, began a volume at 19:21 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 12, 3:20 PM EDT | HAIL 0.5 | Fort Washington, PA | DIME SIZE HAIL REPORTED IN FORT WASHINGTON. |
| Jun 12, 3:20 PM EDT | HAIL 0.5 | Warminster Heights, PA | DIME SIZE HAIL REPORTED IN WARMINSTER. |
| Jun 12, 3:35 PM EDT | HAIL 0.5 | Fort Washington, PA | DIME SIZE HAIL REPORTED IN FORT WASHINGTON. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jun 12, 12:55 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 7.3 hours before the alert went out and 107 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
- 186 J/kg
- Mixed-layer CIN
- -92 J/kg
- Mixed-layer LCL
- 1120 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 25 m²/s²
- 0-3 km storm-relative helicity
- 34 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 121921
SVRPHI
PAC017-091-101-122000-
/O.NEW.KPHI.SV.W.0067.070612T1920Z-070612T2000Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
320 PM EDT TUE JUN 12 2007
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
SOUTH CENTRAL BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...
SOUTHEASTERN MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA...
WESTERN PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA...
* UNTIL 400 PM EDT
* AT 317 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL...AND
DAMAGING WINDS NEAR 60 MPH. THIS STORM WAS LOCATED NEAR WILLOW
GROVE...OR ABOUT 9 MILES NORTH OF PHILADELPHIA...AND MOVING
SOUTHWEST AT 15 TO 20 MPH.
* THE SEVERE THUNDERSTORM WILL BE NEAR...
CHESTNUT HILL AND PLYMOUTH MEETING BY 330 PM EDT...
GERMANTOWN AND 6 MILES SOUTHEAST OF NORRISTOWN BY 335 PM EDT...
ROXBOROUGH AND 7 MILES SOUTHEAST OF KING OF PRUSSIA BY 340 PM
EDT...
BRYN MAWR BY 345 PM EDT...
IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.
LAT...LON 4021 7502 4029 7516 4010 7543 3999 7528
3998 7518 4005 7514 4007 7512
$$
JRPThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 12, 12:56 PM EDT | Severe Thunderstorm Warning | PHI | Monroe | 64 min |
| Jun 12, 1:12 PM EDT | Severe Thunderstorm Warning | PHI | Lehigh | 26 min |
| Jun 12, 1:18 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 42 min |
| Jun 12, 2:00 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Lehigh, Northampton | 30 min |
| Jun 12, 2:15 PM EDT | Severe Thunderstorm Warning | PHI | Montgomery, Philadelphia | 30 min |
| Jun 12, 2:25 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 35 min |
| Jun 12, 2:48 PM EDT | Severe Thunderstorm Warning | PHI | Philadelphia | 42 min |
| Jun 12, 4:00 PM EDT | Flash Flood Warning | PHI | Montgomery | 3 hr |
| Jun 12, 4:08 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 37 min |
| Jun 12, 5:46 PM EDT | Flash Flood Warning | PHI | Bucks | 119 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2007Every severe thunderstorm warning in 2007
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.