Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2015
Severe Thunderstorm Warning 15, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 27, 2015, 4:36 PM EDT for Chester County, Pennsylvania. It was in force for 39 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
- May 27, 2015, 4:36 PM EDT (20:36 UTC)
- Expired
- May 27, 2015, 5:15 PM EDT
- In force
- 39 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
County Chester County, PA
The radar
The Philadelphia radar (KDIX), 124 km from the middle of the area, began a volume at 20:37 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| May 27, 12:54 PM EDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 8.6 hours before the alert went out and 53 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
- 428 J/kg
- Mixed-layer CIN
- -59 J/kg
- Mixed-layer LCL
- 589 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 78 m²/s²
- 0-3 km storm-relative helicity
- 81 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.7
The text
As transmitted, in the capitals the NWS used until 2016.
728
WUUS51 KPHI 272036
SVRPHI
PAC029-272115-
/O.NEW.KPHI.SV.W.0015.150527T2036Z-150527T2115Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
436 PM EDT WED MAY 27 2015
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
CHESTER COUNTY IN SOUTHEASTERN PENNSYLVANIA...
* UNTIL 515 PM EDT
* AT 436 PM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. THIS
STORM WAS LOCATED NEAR WEST GROVE...MOVING NORTHEAST AT 35 MPH.
* LOCATIONS IMPACTED INCLUDE...
WEST CHESTER...PHOENIXVILLE...COATESVILLE...DOWNINGTOWN...KENNETT
SQUARE...OXFORD...PARKESBURG...WEST GROVE...MARSHALLTON...
HOMEVILLE...COCHRANVILLE...GLENMOORE...CHESTER SPRINGS...
PUGHTOWN...PAOLI...LIONVILLE-MARCHWOOD...LIONVILLE...WEST GOSHEN...
MALVERN AND SOUTH COATESVILLE.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...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 3987 7599 3990 7599 4022 7563 4004 7542
3973 7589 3983 7602 3985 7602
TIME...MOT...LOC 2036Z 229DEG 31KT 3984 7589
$$
IOVINO1 follow-up statement
195 WWUS51 KPHI 272056 SVSPHI SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 456 PM EDT WED MAY 27 2015 PAC029-272115- /O.CON.KPHI.SV.W.0015.000000T0000Z-150527T2115Z/ CHESTER PA- 456 PM EDT WED MAY 27 2015 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM EDT FOR CENTRAL CHESTER COUNTY... AT 455 PM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED OVER MARSHALLTON...MOVING NORTHEAST AT 35 MPH. LOCATIONS IMPACTED INCLUDE... WEST CHESTER...PHOENIXVILLE...COATESVILLE...DOWNINGTOWN...KENNETT SQUARE...PARKESBURG...CHESTER SPRINGS...MARSHALLTON...GLENMOORE... PUGHTOWN...PAOLI...LIONVILLE-MARCHWOOD...LIONVILLE...WEST GOSHEN... MALVERN...SOUTH COATESVILLE...MODENA...THORNDALE...TOUGHKENAMON AND DEVON-BERWYN. PRECAUTIONARY/PREPAREDNESS ACTIONS... SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...DEADLY LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER COVERS THE ROAD. && LAT...LON 4022 7563 4004 7542 3982 7576 3996 7592 TIME...MOT...LOC 2055Z 229DEG 31KT 3995 7572 $$ IOVINO
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 27, 2:23 PM EDT | Special Weather Statement | PHI | Lebanon | 22 min |
| May 27, 2:48 PM EDT | Special Weather Statement | PHI | Carbon | 27 min |
| May 27, 2:53 PM EDT | Special Weather Statement | PHI | Berks, Lehigh | 52 min |
| May 27, 3:06 PM EDT | Special Weather Statement | PHI | Carbon, Monroe | 54 min |
| May 27, 3:13 PM EDT | Special Weather Statement | PHI | Berks | 62 min |
| May 27, 3:53 PM EDT | Special Weather Statement | PHI | Monroe | 37 min |
| May 27, 4:26 PM EDT | Special Weather Statement | PHI | Chester | 64 min |
| May 27, 5:07 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Chester, Delaware, Montgomery | 53 min |
| May 27, 5:25 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 44 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.