Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2015
Severe Thunderstorm Warning 16, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at May 27, 2015, 5:07 PM EDT for 4 counties in Pennsylvania. It was in force for 53 min. 1 report 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
- May 27, 2015, 5:07 PM EDT (21:07 UTC)
- Expired
- May 27, 2015, 6:00 PM EDT
- In force
- 53 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Bucks County, PA, Chester County, PA, Delaware County, PA, Montgomery County, PA
The radar
The Philadelphia radar (KDIX), 90 km from the middle of the area, began a volume at 21:10 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 |
|---|---|---|---|
| May 27, 5:25 PM EDT | TSTM WND DMG | Upper Merion Twp, PA | TREES DOWN. |
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 |
|---|---|---|---|
| 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, 9.1 hours before the alert went out and 90 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.
525 WUUS51 KPHI 272107 SVRPHI PAC017-029-045-091-272200- /O.NEW.KPHI.SV.W.0016.150527T2107Z-150527T2200Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 507 PM EDT WED MAY 27 2015 THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... CENTRAL MONTGOMERY COUNTY IN SOUTHEASTERN PENNSYLVANIA... NORTH CENTRAL DELAWARE COUNTY IN SOUTHEASTERN PENNSYLVANIA... CENTRAL BUCKS COUNTY IN SOUTHEASTERN PENNSYLVANIA... NORTHEASTERN CHESTER COUNTY IN SOUTHEASTERN PENNSYLVANIA... * UNTIL 600 PM EDT * AT 506 PM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED OVER LIONVILLE...AND MOVING NORTHEAST AT 35 MPH. * LOCATIONS IMPACTED INCLUDE... WEST CHESTER...NORRISTOWN...PHOENIXVILLE...LANSDALE...WEST NORRITON...EAST NORRITON...WESTTOWN...PERKASIE...DOYLESTOWN... DOWNINGTOWN...CONSHOHOCKEN...HATBORO...SOUDERTON...AMBLER... COLLEGEVILLE...ROYERSFORD...CHALFONT...TRAPPE...HATFIELD AND DUBLIN. PRECAUTIONARY/PREPAREDNESS ACTIONS... SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...LARGE 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 3989 7563 4003 7578 4047 7524 4025 7495 TIME...MOT...LOC 2106Z 228DEG 32KT 4004 7562 $$ IOVINO
1 follow-up statement
185 WWUS51 KPHI 272132 SVSPHI SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 532 PM EDT WED MAY 27 2015 PAC017-029-045-091-272200- /O.CON.KPHI.SV.W.0016.000000T0000Z-150527T2200Z/ MONTGOMERY PA-DELAWARE PA-BUCKS PA-CHESTER PA- 532 PM EDT WED MAY 27 2015 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM EDT FOR CENTRAL MONTGOMERY...NORTH CENTRAL DELAWARE...CENTRAL BUCKS AND NORTHEASTERN CHESTER COUNTIES... AT 531 PM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR COLLEGEVILLE...MOVING NORTHEAST AT 35 MPH. LOCATIONS IMPACTED INCLUDE... NORRISTOWN...PHOENIXVILLE...LANSDALE...WEST NORRITON...EAST NORRITON...PERKASIE...DOYLESTOWN...CONSHOHOCKEN...HATBORO... SOUDERTON...AMBLER...COLLEGEVILLE...ROYERSFORD...CHALFONT...TRAPPE... HATFIELD...DUBLIN...SCHWENKSVILLE...IVYLAND AND VALLEY FORGE. PRECAUTIONARY/PREPAREDNESS ACTIONS... SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...DEADLY LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER COVERS THE ROAD. && LAT...LON 3995 7552 4022 7555 4047 7524 4025 7495 TIME...MOT...LOC 2131Z 228DEG 32KT 4019 7540 $$ 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, 4:36 PM EDT | Severe Thunderstorm Warning | PHI | Chester | 39 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.