Alert archive / Pennsylvania / Tornado Warnings in 2011
Tornado Warning 26, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this tornado warning at Aug 27, 2011, 10:36 PM EDT for Bucks County, Montgomery County, Philadelphia County, Pennsylvania; Burlington County, New Jersey. It was in force for 24 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 27, 2011, 10:36 PM EDT (02:36 UTC)
- Expired
- Aug 27, 2011, 11:00 PM EDT
- In force
- 24 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Burlington County, NJ, Bucks County, PA, Montgomery County, PA, Philadelphia County, PA
The radar
The Philadelphia radar (KDIX), 47 km from the middle of the area, began a volume at 02:55 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 |
|---|---|---|---|
| Aug 27, 7:56 PM EDT | Tornado Watch | SPC | 9 hr |
The nearest sounding before it
Brookhaven, NY (KOKX), launched 00:00Z, 2.6 hours before the alert went out and 194 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
- 957 J/kg
- Mixed-layer CIN
- -1 J/kg
- Mixed-layer LCL
- 466 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- 110 m²/s²
- 0-3 km storm-relative helicity
- 269 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
840 WFUS51 KPHI 280236 TORPHI NJC005-PAC017-091-101-280300- /O.NEW.KPHI.TO.W.0026.110828T0236Z-110828T0300Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 1036 PM EDT SAT AUG 27 2011 THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A * TORNADO WARNING FOR... SOUTHEASTERN BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA... SOUTHEASTERN MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA... NORTHEASTERN PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA... NORTHWESTERN BURLINGTON COUNTY IN SOUTHERN NEW JERSEY... * UNTIL 1100 PM EDT * AT 1035 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR COLUMBUS... OR 12 MILES SOUTH OF TRENTON...MOVING NORTHWEST AT 35 MPH. * THE TORNADO WILL BE NEAR... FLORENCE BY 1045 PM EDT... BRISTOL...BURLINGTON...LEVITTOWN AND TULLYTOWN BY 1050 PM EDT... BENSALEM...LANGHORNE...LANGHORN AND ANDALUSIA BY 1055 PM EDT... FEASTERVILLE BY 1100 PM EDT... PRECAUTIONARY/PREPAREDNESS ACTIONS... WHEN A TORNADO WARNING IS ISSUED BASED ON DOPPLER RADAR...IT MEANS THAT STRONG ROTATION HAS BEEN DETECTED IN THE STORM. A TORNADO MAY ALREADY BE ON THE GROUND...OR IS EXPECTED TO DEVELOP SHORTLY. IF YOU ARE IN THE PATH OF THIS DANGEROUS STORM...MOVE INDOORS AND TO THE LOWEST LEVEL OF THE BUILDING. STAY AWAY FROM WINDOWS. IF DRIVING...DO NOT SEEK SHELTER UNDER A HIGHWAY OVERPASS. THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO COVER YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS. IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS. 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. A TORNADO WATCH REMAINS IN EFFECT UNTIL 500 AM EDT SUNDAY MORNING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW JERSEY AND SOUTHEAST PENNSYLVANIA. && LAT...LON 4010 7514 4029 7507 4009 7458 3991 7469 TIME...MOT...LOC 0236Z 115DEG 32KT 4006 7472 $$ HAYES/GAINES
2 follow-up statements
476 WWUS51 KPHI 280249 SVSPHI SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 1049 PM EDT SAT AUG 27 2011 NJC005-PAC017-091-101-280300- /O.CON.KPHI.TO.W.0026.000000T0000Z-110828T0300Z/ PHILADELPHIA PA-MONTGOMERY PA-BUCKS PA-BURLINGTON NJ- 1049 PM EDT SAT AUG 27 2011 ...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1100 PM EDT FOR NORTHWESTERN BURLINGTON...SOUTHEASTERN BUCKS...SOUTHEASTERN MONTGOMERY AND NORTHEASTERN PHILADELPHIA COUNTIES... AT 1048 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A TORNADO. THIS TORNADO WAS LOCATED NEAR BRISTOL...OR 9 MILES SOUTHWEST OF TRENTON...MOVING NORTHWEST AT 35 MPH. THE TORNADO WILL BE NEAR... HULMEVILLE...PENNDEL...LANGHORNE MANOR AND BENSALEM BY 1055 PM EDT... FEASTERVILLE...VILLAGE SHIRES...CHURCHVILLE AND NORTHEAST PHILADELPHIA BY 1100 PM EDT... PRECAUTIONARY/PREPAREDNESS ACTIONS... THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO COVER YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS. IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS. PLEASE REPORT HAIL OR STRONG WINDS TO THE NATIONAL WEATHER SERVICE BY CALLING TOLL FREE...1-877-633-6772...WHEN YOU CAN DO SO SAFELY. A TORNADO WATCH REMAINS IN EFFECT UNTIL 500 AM EDT SUNDAY MORNING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW JERSEY AND SOUTHEAST PENNSYLVANIA. && LAT...LON 4010 7514 4029 7507 4009 7458 3991 7469 TIME...MOT...LOC 0249Z 115DEG 32KT 4011 7486 $$ HAYES/GAINES
329 WWUS51 KPHI 280300 SVSPHI SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 1100 PM EDT SAT AUG 27 2011 NJC005-PAC017-091-101-280310- /O.EXP.KPHI.TO.W.0026.000000T0000Z-110828T0300Z/ PHILADELPHIA PA-MONTGOMERY PA-BUCKS PA-BURLINGTON NJ- 1100 PM EDT SAT AUG 27 2011 ...THE TORNADO WARNING FOR NORTHWESTERN BURLINGTON...SOUTHEASTERN BUCKS...SOUTHEASTERN MONTGOMERY AND NORTHEASTERN PHILADELPHIA COUNTIES HAS EXPIRED... 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. A TORNADO WATCH REMAINS IN EFFECT UNTIL 500 AM EDT SUNDAY MORNING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW JERSEY AND SOUTHEAST PENNSYLVANIA. LAT...LON 4010 7514 4029 7507 4009 7458 3991 7469 TIME...MOT...LOC 0249Z 115DEG 32KT 4011 7486 $$ HAYES/GAINES
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 27, 8:28 PM EDT | Flash Flood Warning | PHI | Chester | 12 hr |
| Aug 27, 9:29 PM EDT | Tornado Warning | PHI | Delaware | 31 min |
| Aug 27, 9:43 PM EDT | Areal Flood Warning | PHI | Berks, Bucks, Chester, Lehigh, Montgomery, Northampton | 6 hr |
| Aug 27, 9:58 PM EDT | River Flood Warning | PHI | Monroe, Northampton | 48 hr |
| Aug 27, 9:58 PM EDT | River Flood Warning | PHI | Monroe, Northampton | 17 hr |
| Aug 27, 10:14 PM EDT | Tornado Warning | PHI | Chester, Delaware | 31 min |
| Aug 27, 10:23 PM EDT | Tornado Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 37 min |
| Aug 27, 11:21 PM EDT | Areal Flood Warning | PHI | Carbon, Monroe | 6 hr |
| Aug 27, 11:22 PM EDT | Tornado Warning | PHI | Bucks, Montgomery | 23 min |
| Aug 27, 11:37 PM EDT | Flash Flood Warning | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 12 hr |
| Aug 28, 3:50 AM EDT | Flash Flood Warning | PHI | Berks, Bucks, Chester, Lehigh, Montgomery, Northampton | 10 hr |
| Aug 28, 5:17 AM EDT | Flash Flood Warning | PHI | Carbon, Monroe | 10 hr |
| Aug 28, 11:07 AM EDT | Areal Flood Warning | PHI | Bucks, Chester, Delaware, Montgomery, Philadelphia | 18 hr |
| Aug 28, 1:27 PM EDT | Areal Flood Warning | PHI | Berks, Bucks, Lehigh, Montgomery, Northampton | 8 hr |
| Aug 28, 3:23 PM EDT | Areal Flood Warning | PHI | Carbon, Monroe | 8 hr |
| Aug 28, 6:47 PM EDT | River Flood Warning | PHI | Lehigh | 2 hr |
| Aug 27, 8:41 PM EDT | Tornado Warning | PHI | Atlantic | 34 min |
| Aug 27, 9:03 PM EDT | Tornado Warning | PHI | Burlington, Ocean | 27 min |
| Aug 27, 9:08 PM EDT | Tornado Warning | PHI | Atlantic, Cape May, Cumberland | 37 min |
| Aug 27, 9:46 PM EDT | Tornado Warning | PHI | Salem | 29 min |
| Aug 27, 9:56 PM EDT | Special Marine Warning | PHI | 19 min | |
| Aug 27, 10:08 PM EDT | Tornado Warning | PHI | Burlington, Ocean | 37 min |
| Aug 27, 10:11 PM EDT | River Flood Warning | PHI | Passaic | 4 days |
| Aug 27, 10:56 PM EDT | Tornado Warning | PHI | Mercer, Monmouth, Ocean | 34 min |
| Aug 27, 11:52 PM EDT | Special Marine Warning | PHI | 23 min | |
| Aug 28, 12:55 AM EDT | Special Weather Statement | PHI | Atlantic, Cumberland | 65 min |
| Aug 28, 2:40 AM EDT | Tornado Warning | PHI | Mercer, Monmouth, Ocean | 35 min |
| Aug 28, 8:09 AM EDT | Areal Flood Warning | PHI | Cape May, Cumberland, Gloucester, Salem | 12 hr |
Nearby
Tornado Warnings in Pennsylvania, 2011Tornado Warnings in New Jersey, 2011Every tornado warning in 2011Tornadoes in 2011
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.