Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2012
Severe Thunderstorm Warning 185, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 9, 2012, 3:57 PM EDT for Bucks County, Montgomery County, Pennsylvania. It was in force for 63 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 9, 2012, 3:57 PM EDT (19:57 UTC)
- Expired
- Aug 9, 2012, 5:00 PM EDT
- In force
- 63 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Bucks County, PA, Montgomery County, PA
The radar
The Philadelphia radar (KDIX), 97 km from the middle of the area, began a volume at 19:58 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 nearest sounding before it
Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 8.0 hours before the alert went out and 116 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
- 1906 J/kg
- Mixed-layer CIN
- -18 J/kg
- Mixed-layer LCL
- 754 m above ground
- 0-6 km bulk shear
- 10 kt
- 0-1 km storm-relative helicity
- 46 m²/s²
- 0-3 km storm-relative helicity
- 37 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
434
WUUS51 KPHI 091957
SVRPHI
PAC017-091-092100-
/O.NEW.KPHI.SV.W.0185.120809T1957Z-120809T2100Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
357 PM EDT THU AUG 9 2012
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
NORTHWESTERN BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...
NORTHERN MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA...
* UNTIL 500 PM EDT
* AT 353 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM HAS PRODUCED HAIL
UPWARDS OF THREE QUARTERS OF AN INCH. THIS STORM WAS LOCATED NEAR
GREEN LANE...OR 20 MILES SOUTH OF ALLENTOWN...AND MOVING NORTHEAST
AT 10 MPH.
* THE SEVERE THUNDERSTORM WILL BE NEAR...
GREEN LANE AND 7 MILES SOUTHEAST OF EAST GREENVILLE AROUND 415 PM
EDT...
7 MILES SOUTHEAST OF GERYVILLE AROUND 425 PM EDT...
SOUDERTON...6 MILES NORTHWEST OF HATFIELD AND 9 MILES NORTHWEST OF
LANSDALE AROUND 455 PM EDT...
PERKASIE...QUAKERTOWN...6 MILES NORTHWEST OF FRICKS AND 7 MILES
WEST OF DUBLIN AROUND 500 PM EDT...
PRECAUTIONARY/PREPAREDNESS ACTIONS...
THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...LARGE HAIL...AND DEADLY CLOUD TO
GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.
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 4021 7537 4034 7541 4030 7553 4040 7557
4043 7555 4044 7552 4042 7548 4048 7542
4055 7526 4029 7509
TIME...MOT...LOC 1957Z 244DEG 7KT 4030 7549
$$
HEAVENER4 follow-up statements
196 WWUS51 KPHI 092019 SVSPHI SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 419 PM EDT THU AUG 9 2012 PAC017-091-092100- /O.CON.KPHI.SV.W.0185.000000T0000Z-120809T2100Z/ BUCKS PA-MONTGOMERY PA- 419 PM EDT THU AUG 9 2012 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM EDT FOR CENTRAL MONTGOMERY AND CENTRAL BUCKS COUNTIES... AT 415 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED 6 MILES WEST OF TELFORD...OR 19 MILES SOUTH OF ALLENTOWN... MOVING NORTHEAST AT 10 MPH. THE SEVERE THUNDERSTORM WILL BE NEAR... 7 MILES NORTHWEST OF KULPSVILLE BY 435 PM EDT... 8 MILES NORTHWEST OF LANSDALE BY 455 PM EDT... SELLERSVILLE...TELFORD...PERKASIE AND SOUDERTON BY 500 PM EDT... PRECAUTIONARY/PREPAREDNESS ACTIONS... PLEASE REPORT HAIL OR STRONG WINDS TO THE NATIONAL WEATHER SERVICE BY CALLING TOLL FREE...1-877-633-6772...WHEN YOU CAN DO SO SAFELY. && LAT...LON 4022 7535 4039 7543 4046 7520 4029 7509 TIME...MOT...LOC 2019Z 244DEG 7KT 4032 7544 $$ HEAVENER
050 WWUS51 KPHI 092034 SVSPHI SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 434 PM EDT THU AUG 9 2012 PAC091-092043- /O.CAN.KPHI.SV.W.0185.000000T0000Z-120809T2100Z/ MONTGOMERY PA- 434 PM EDT THU AUG 9 2012 ...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL MONTGOMERY COUNTY IS CANCELLED... THE SEVERE STORM IS IN BUCKS COUNTY. 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 4026 7521 4039 7543 4046 7520 4029 7509 TIME...MOT...LOC 2033Z 264DEG 18KT 4032 7521 $$ PAC017-092100- /O.CON.KPHI.SV.W.0185.000000T0000Z-120809T2100Z/ BUCKS PA- 434 PM EDT THU AUG 9 2012 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM EDT FOR CENTRAL BUCKS COUNTY... AT 432 PM EDT...A SEVERE THUNDERSTORM WAS REPORTED CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR FRICKS...OR 22 MILES NORTH OF PHILADELPHIA...MOVING EAST AT 20 MPH. THE SEVERE THUNDERSTORM WILL BE NEAR... NEW BRITAIN AND 7 MILES SOUTH OF BEDMINSTER BY 440 PM EDT... DOYLESTOWN AND ROBESONIA BY 445 PM EDT... PRECAUTIONARY/PREPAREDNESS ACTIONS... IN ADDITION TO LIKELY DAMAGING WINDS...FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS IMMEDIATELY! REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING. PLEASE REPORT HAIL OR STRONG WINDS TO THE NATIONAL WEATHER SERVICE BY CALLING TOLL FREE...1-877-633-6772...WHEN YOU CAN DO SO SAFELY. && LAT...LON 4026 7521 4039 7543 4046 7520 4029 7509 TIME...MOT...LOC 2033Z 264DEG 18KT 4032 7521 $$ TFG
296 WWUS51 KPHI 092050 SVSPHI SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 450 PM EDT THU AUG 9 2012 PAC017-092100- /O.EXP.KPHI.SV.W.0185.000000T0000Z-120809T2100Z/ BUCKS PA- 450 PM EDT THU AUG 9 2012 ...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL BUCKS COUNTY WILL EXPIRE AT 500 PM EDT... 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 4026 7521 4039 7543 4046 7520 4029 7509 TIME...MOT...LOC 2050Z 264DEG 18KT 4033 7510 $$ HEAVENER
238 WWUS51 KPHI 092051 SVSPHI SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 451 PM EDT THU AUG 9 2012 PAC017-092101- /O.EXP.KPHI.SV.W.0185.000000T0000Z-120809T2100Z/ BUCKS PA- 451 PM EDT THU AUG 9 2012 ...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL BUCKS COUNTY WILL EXPIRE AT 500 PM EDT... THE SEVERE THUNDERSTORM IS EAST OF THE AREA. PLEASE REPORT HAIL OR STRONG WINDS TO THE NATIONAL WEATHER SERVICE BY CALLING TOLL FREE...1-877-633-6772...WHEN YOU CAN DO SO SAFELY. LAT...LON 4026 7521 4039 7543 4046 7520 4029 7509 TIME...MOT...LOC 2051Z 264DEG 18KT 4033 7509 $$ TFG
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 9, 1:00 PM EDT | Special Weather Statement | PHI | Lehigh | 60 min |
| Aug 9, 1:22 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Montgomery | 68 min |
| Aug 9, 1:26 PM EDT | Areal Flood Advisory | PHI | Bucks, Montgomery | 3 hr |
| Aug 9, 1:33 PM EDT | Special Weather Statement | PHI | Northampton | 57 min |
| Aug 9, 1:42 PM EDT | Special Weather Statement | PHI | Monroe | 63 min |
| Aug 9, 1:45 PM EDT | Special Weather Statement | PHI | Berks | 60 min |
| Aug 9, 2:13 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 77 min |
| Aug 9, 2:20 PM EDT | Severe Thunderstorm Warning | PHI | Northampton | 70 min |
| Aug 9, 2:25 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 65 min |
| Aug 9, 3:03 PM EDT | Special Weather Statement | PHI | Monroe | 87 min |
| Aug 9, 3:05 PM EDT | Special Weather Statement | PHI | Chester, Montgomery | 85 min |
| Aug 9, 3:11 PM EDT | Areal Flood Advisory | PHI | Carbon, Monroe | 6 hr |
| Aug 9, 3:20 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Montgomery | 55 min |
| Aug 9, 3:39 PM EDT | Special Weather Statement | PHI | Bucks | 66 min |
| Aug 9, 3:57 PM EDT | Areal Flood Advisory | PHI | Chester, Montgomery | 104 min |
| Aug 9, 4:18 PM EDT | Special Weather Statement | PHI | Bucks | 57 min |
| Aug 9, 4:33 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 57 min |
| Aug 9, 4:57 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 78 min |
| Aug 9, 5:06 PM EDT | Areal Flood Advisory | PHI | Bucks | 3 hr |
| Aug 9, 5:26 PM EDT | Flash Flood Warning | PHI | Bucks | 2 hr |
| Aug 9, 7:01 PM EDT | Special Weather Statement | PHI | Berks | 59 min |
| Aug 9, 7:10 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Carbon, Lehigh | 80 min |
| Aug 9, 7:40 PM EDT | Special Weather Statement | PHI | Carbon, Monroe | 95 min |
| Aug 9, 7:46 PM EDT | Areal Flood Advisory | PHI | Berks | 3 hr |
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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.