Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 74, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 4, 2012, 11:45 PM EDT for Bucks County, Montgomery County, Pennsylvania. It was in force for 28 min. 2 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
- Jul 4, 2012, 11:45 PM EDT (03:45 UTC)
- Expired
- Jul 5, 2012, 12:13 AM EDT
- In force
- 28 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Bucks County, PA, Montgomery County, PA
The radar
The Philadelphia radar (KDIX), 79 km from the middle of the area, began a volume at 03:46 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 4, 11:50 PM EDT | HAIL 0.75 | Warrington, PA | |
| Jul 4, 11:58 PM EDT | TSTM WND DMG | Warrington, PA | TREE DOWN ON WIRES NEAR THE WARRINGTON AREA. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Brookhaven, NY (KOKX), launched 00:00Z, 3.8 hours before the alert went out and 213 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
- 1802 J/kg
- Mixed-layer CIN
- -82 J/kg
- Mixed-layer LCL
- 1100 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 121 m²/s²
- 0-3 km storm-relative helicity
- 189 m²/s²
- Significant tornado parameter
- 0.7
- Supercell composite
- 3.9
The text
As transmitted, in the capitals the NWS used until 2016.
110 WUUS51 KPHI 050345 SVRPHI PAC017-091-050430- /O.NEW.KPHI.SV.W.0074.120705T0345Z-120705T0430Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 1145 PM EDT WED JUL 4 2012 THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... CENTRAL BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA... MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA... * UNTIL 1230 AM EDT * AT 1142 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR SOUDERTON...OR 18 MILES SOUTH OF ALLENTOWN...AND MOVING SOUTHEAST AT 35 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... SOUDERTON AROUND 1150 PM EDT... HATFIELD AND FRICKS AROUND 1155 PM EDT... LANSDALE AND CHALFONT AROUND MIDNIGHT EDT... AMBLER AND 6 MILES NORTHEAST OF PLYMOUTH MEETING AROUND 1210 AM EDT... WILLOW GROVE AND HATBORO AROUND 1215 AM EDT... PRECAUTIONARY/PREPAREDNESS ACTIONS... IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS IMMEDIATELY! REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING. PLEASE REPORT HAIL OR STRONG WINDS TO THE NATIONAL WEATHER SERVICE BY CALLING TOLL FREE...1-877-633-6772...WHEN YOU CAN DO SO SAFELY. && LAT...LON 4016 7497 4007 7538 4037 7558 4046 7535 TIME...MOT...LOC 0344Z 321DEG 29KT 4033 7537 $$ GORSE
1 follow-up statement
264 WWUS51 KPHI 050413 SVSPHI SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 1213 AM EDT THU JUL 5 2012 PAC017-091-050422- /O.CAN.KPHI.SV.W.0074.000000T0000Z-120705T0430Z/ BUCKS PA-MONTGOMERY PA- 1213 AM EDT THU JUL 5 2012 ...THE SEVERE THUNDERSTORM WARNING FOR MONTGOMERY AND CENTRAL BUCKS COUNTIES IS CANCELLED... THE THUNDERSTORM HAS WEAKENED BELOW SEVERE THRESHOLDS, THEREFORE THE WARNING HAS BEEN CANCELLED. THIS STORM HOWEVER CONTINUES TO PRODUCE DOWNPOURS ALONG WITH CLOUD TO GROUND LIGHTNING. PLEASE REPORT HAIL OR STRONG WINDS TO THE NATIONAL WEATHER SERVICE BY CALLING TOLL FREE...1-877-633-6772...WHEN YOU CAN DO SO SAFELY. LAT...LON 4016 7497 4007 7538 4037 7558 4046 7535 TIME...MOT...LOC 0412Z 321DEG 29KT 4015 7518 $$ GORSE
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 4, 9:18 PM EDT | Special Weather Statement | PHI | Carbon, Monroe | 57 min |
| Jul 4, 10:37 PM EDT | Special Weather Statement | PHI | Berks, Lehigh | 38 min |
| Jul 4, 11:07 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Lehigh | 27 min |
| Jul 4, 11:14 PM EDT | Special Weather Statement | PHI | Bucks, Lehigh | 46 min |
| Jul 4, 11:37 PM EDT | Special Weather Statement | PHI | Montgomery | 38 min |
| Jul 5, 1:34 AM EDT | Special Weather Statement | PHI | Lehigh | 56 min |
| Jul 5, 1:41 AM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Carbon, Lehigh, Montgomery, Northampton | 34 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2012Every severe thunderstorm warning in 2012
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.