Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2015
Severe Thunderstorm Warning 36, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 12, 2015, 4:57 PM EDT for Berks County, Chester County, Montgomery County, Pennsylvania. It was in force for 48 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
- Jun 12, 2015, 4:57 PM EDT (20:57 UTC)
- Expired
- Jun 12, 2015, 5:45 PM EDT
- In force
- 48 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Berks County, PA, Chester County, PA, Montgomery County, PA
The radar
The Philadelphia radar (KDIX), 115 km from the middle of the area, began a volume at 20:57 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
Washington/Dulle, VA (KIAD), launched 12:00Z, 9.0 hours before the alert went out and 202 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
- 325 J/kg
- Mixed-layer CIN
- -121 J/kg
- Mixed-layer LCL
- 1369 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 38 m²/s²
- 0-3 km storm-relative helicity
- 67 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
855
WUUS51 KPHI 122057
SVRPHI
PAC011-029-091-122145-
/O.NEW.KPHI.SV.W.0036.150612T2057Z-150612T2145Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
457 PM EDT FRI JUN 12 2015
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
NORTHEASTERN CHESTER COUNTY IN SOUTHEASTERN PENNSYLVANIA...
SOUTHEASTERN BERKS COUNTY IN EASTERN PENNSYLVANIA...
MONTGOMERY COUNTY IN SOUTHEASTERN PENNSYLVANIA...
* UNTIL 545 PM EDT
* AT 455 PM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM
WAS LOCATED OVER GLENMOORE...OR 11 MILES NORTHWEST OF WEST
CHESTER...AND MOVING EAST AT 25 MPH.
* LOCATIONS IMPACTED INCLUDE...
POTTSTOWN...PHOENIXVILLE...LANSDALE...WEST NORRITON...EAST
NORRITON...SOUDERTON...BIRDSBORO...COLLEGEVILLE...ROYERSFORD...
TRAPPE...HATFIELD...EAST GREENVILLE...SCHWENKSVILLE...ELVERSON...
BALLY...BECHTELSVILLE...GREEN LANE...NEW MORGAN...GLENMOORE AND
CEDARVILLE.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...LARGE HAIL...DEADLY
LIGHTNING AND VERY HEAVY RAIN. HEAVY RAINS ASSOCIATED WITH THIS
STORM COULD FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE
WATER COVERS THE ROAD.
&&
LAT...LON 4046 7556 4022 7516 4000 7581 4013 7589
4014 7588 4017 7592 4019 7593
TIME...MOT...LOC 2055Z 253DEG 18KT 4009 7573
$$
JJM2 follow-up statements
994
WWUS51 KPHI 122110
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
510 PM EDT FRI JUN 12 2015
PAC011-029-091-122145-
/O.CON.KPHI.SV.W.0036.000000T0000Z-150612T2145Z/
CHESTER PA-BERKS PA-MONTGOMERY PA-
510 PM EDT FRI JUN 12 2015
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM EDT
FOR NORTHEASTERN CHESTER...SOUTHEASTERN BERKS AND MONTGOMERY
COUNTIES...
AT 510 PM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE
OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS
LOCATED NEAR PUGHTOWN...OR 13 MILES NORTH OF WEST CHESTER...MOVING
NORTHEAST AT 25 MPH.
LOCATIONS IMPACTED INCLUDE...
POTTSTOWN...PHOENIXVILLE...LANSDALE...WEST NORRITON...EAST
NORRITON...SOUDERTON...BIRDSBORO...COLLEGEVILLE...ROYERSFORD...
TRAPPE...HATFIELD...EAST GREENVILLE...SCHWENKSVILLE...ELVERSON...
BALLY...BECHTELSVILLE...GREEN LANE...GLENMOORE...CEDARVILLE AND
CHESTER SPRINGS.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...DESTRUCTIVE HAIL...
DEADLY LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN
INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY
RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER
COVERS THE ROAD.
&&
LAT...LON 4046 7556 4022 7517 4004 7570 4002 7575
4023 7587
TIME...MOT...LOC 2110Z 242DEG 23KT 4015 7560
$$
JJM904
WWUS51 KPHI 122136
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
536 PM EDT FRI JUN 12 2015
PAC011-029-091-122146-
/O.EXP.KPHI.SV.W.0036.000000T0000Z-150612T2145Z/
CHESTER PA-BERKS PA-MONTGOMERY PA-
536 PM EDT FRI JUN 12 2015
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN CHESTER...
SOUTHEASTERN BERKS AND MONTGOMERY COUNTIES WILL EXPIRE AT 545 PM
EDT...
THE SEVERE THUNDERSTORM WHICH PROMPTED THE WARNING HAS WEAKENED.
THEREFORE THE WARNING WILL BE ALLOWED TO EXPIRE.
LAT...LON 4046 7556 4022 7517 4004 7570 4002 7575
4023 7587
TIME...MOT...LOC 2133Z 253DEG 18KT 4015 7560
$$
JJMThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 11, 8:57 PM EDT | Special Weather Statement | PHI | Schuylkill | 48 min |
| Jun 11, 9:23 PM EDT | Special Weather Statement | PHI | Lehigh, Northampton | 52 min |
| Jun 11, 9:33 PM EDT | Special Weather Statement | PHI | Berks | 27 min |
| Jun 11, 9:41 PM EDT | Areal Flood Advisory | PHI | Lehigh, Northampton | 4 hr |
| Jun 11, 9:54 PM EDT | Special Weather Statement | PHI | Berks | 51 min |
| Jun 12, 4:38 PM EDT | Special Weather Statement | PHI | Montgomery | 52 min |
| Jun 12, 5:07 PM EDT | Severe Thunderstorm Warning | PHI | Lehigh, Northampton | 38 min |
| Jun 12, 5:41 PM EDT | Severe Thunderstorm Warning | PHI | Northampton | 49 min |
| Jun 12, 6:13 PM EDT | Severe Thunderstorm Warning | PHI | Monroe, Northampton | 28 min |
| Jun 12, 6:53 PM EDT | Severe Thunderstorm Warning | PHI | Lehigh, Northampton | 52 min |
| Jun 12, 7:27 PM EDT | Severe Thunderstorm Warning | PHI | Northampton | 33 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2015Every severe thunderstorm warning in 2015
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.