Alert archive / Pennsylvania / Tornado Warnings in 2015
Tornado Warning 10, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this tornado warning at Oct 9, 2015, 4:47 PM EDT for Chester County, Montgomery County, Pennsylvania. It was in force for 28 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
- Oct 9, 2015, 4:47 PM EDT (20:47 UTC)
- Expired
- Oct 9, 2015, 5:15 PM EDT
- In force
- 28 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Chester County, PA, Montgomery County, PA
The radar
The Philadelphia radar (KDIX), 91 km from the middle of the area, began a volume at 20:47 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 |
|---|---|---|---|
| Oct 9, 3:34 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
The nearest sounding before it
Washington/Dulle, VA (KIAD), launched 12:00Z, 8.8 hours before the alert went out and 214 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
- 43 J/kg
- Mixed-layer CIN
- -181 J/kg
- Mixed-layer LCL
- 1203 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 114 m²/s²
- 0-3 km storm-relative helicity
- 126 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
670
WFUS51 KPHI 092047
TORPHI
PAC029-091-092115-
/O.NEW.KPHI.TO.W.0010.151009T2047Z-151009T2115Z/
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
447 PM EDT FRI OCT 9 2015
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* TORNADO WARNING FOR...
NORTHEASTERN CHESTER COUNTY IN SOUTHEASTERN PENNSYLVANIA...
SOUTHWESTERN MONTGOMERY COUNTY IN SOUTHEASTERN PENNSYLVANIA...
* UNTIL 515 PM EDT
* AT 446 PM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM WAS LOCATED
OVER ROYERSFORD...OR 14 MILES NORTH OF WEST CHESTER...AND MOVING
EAST AT 45 MPH.
* LOCATIONS IMPACTED INCLUDE...
NORRISTOWN...PHOENIXVILLE...WEST NORRITON...EAST NORRITON...
CONSHOHOCKEN...COLLEGEVILLE...ROYERSFORD...TRAPPE...PLYMOUTH
MEETING...KING OF PRUSSIA...SKIPPACK...BRIDGEPORT...SPRING CITY...
WEST CONSHOHOCKEN...EAGLEVILLE...EVANSBURG...SPRING HOUSE...
TROOPER...BLUE BELL AND AUDUBON.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW. MOVE TO A BASEMENT OR AN INTERIOR ROOM ON THE LOWEST
FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF YOU ARE IN A MOBILE
HOME OR OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND
PROTECT YOURSELF FROM FLYING DEBRIS.
&&
LAT...LON 4016 7559 4023 7557 4019 7522 4003 7528
TIME...MOT...LOC 2046Z 290DEG 37KT 4016 7551
$$
SZATKOWSKI1 follow-up statement
256
WWUS51 KPHI 092110
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
510 PM EDT FRI OCT 9 2015
PAC029-091-092118-
/O.EXP.KPHI.TO.W.0010.000000T0000Z-151009T2115Z/
CHESTER PA-MONTGOMERY PA-
510 PM EDT FRI OCT 9 2015
...THE TORNADO WARNING FOR NORTHEASTERN CHESTER AND SOUTHWESTERN
MONTGOMERY COUNTIES WILL EXPIRE AT 515 PM EDT...
THE TORNADIC THUNDERSTORM WHICH PROMPTED THE WARNING HAS WEAKENED.
THEREFORE THE WARNING WILL BE ALLOWED TO EXPIRE.
LAT...LON 4016 7559 4023 7557 4019 7522 4003 7528
TIME...MOT...LOC 2106Z 290DEG 37KT 4016 7551
$$
SZATKOWSKIThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 9, 2:45 PM EDT | Special Weather Statement | PHI | Berks, Carbon, Lehigh, Monroe, Northampton | 90 min |
| Oct 9, 3:17 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Carbon, Lehigh, Monroe, Northampton | 58 min |
| Oct 9, 4:01 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester | 44 min |
| Oct 9, 4:39 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Chester, Delaware, Montgomery, Philadelphia | 51 min |
| Oct 9, 5:25 PM EDT | Special Weather Statement | PHI | Bucks, Montgomery | 65 min |
| Oct 9, 5:41 PM EDT | Special Weather Statement | PHI | Philadelphia | 49 min |
Nearby
Tornado Warnings in Pennsylvania, 2015Every tornado warning in 2015Tornadoes 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.