Alert archive / New Jersey / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 154, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 29, 2009, 5:09 PM EDT for Burlington County, Mercer County, New Jersey; Bucks County, Pennsylvania. It was in force for 66 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
- Jul 29, 2009, 5:09 PM EDT (21:09 UTC)
- Expired
- Jul 29, 2009, 6:15 PM EDT
- In force
- 66 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Burlington County, NJ, Mercer County, NJ, Bucks County, PA
The radar
The Philadelphia radar (KDIX), 42 km from the middle of the area, began a volume at 21:12 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 |
|---|---|---|---|
| Jul 29, 5:30 PM EDT | TSTM WND DMG | Willingboro, NJ | TREES AND WIRES 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 |
|---|---|---|---|
| Jul 29, 12:49 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
The nearest sounding before it
Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 9.2 hours before the alert went out and 136 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
- 1577 J/kg
- Mixed-layer CIN
- -35 J/kg
- Mixed-layer LCL
- 745 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 56 m²/s²
- 0-3 km storm-relative helicity
- 86 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.3
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS51 KPHI 292109 SVRPHI NJC005-021-PAC017-292215- /O.NEW.KPHI.SV.W.0154.090729T2109Z-090729T2215Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 509 PM EDT WED JUL 29 2009 THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... MERCER COUNTY IN CENTRAL NEW JERSEY... THIS INCLUDES THE CITY OF TRENTON... SOUTHEASTERN BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA... NORTHWESTERN BURLINGTON COUNTY IN SOUTHERN NEW JERSEY... * UNTIL 615 PM EDT * AT 509 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL. THIS STORM WAS LOCATED NEAR WILLINGBORO...OR 13 MILES EAST OF PHILADELPHIA...AND MOVING NORTHEAST AT 35 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... BURLINGTON AROUND 515 PM EDT... BRISTOL...FLORENCE AND JACKSONVILLE AROUND 520 PM EDT... LEVITTOWN AROUND 525 PM EDT... BORDENTOWN AROUND 530 PM EDT... WHITE HORSE...TRENTON AND EWING AROUND 535 PM EDT... MERCERVILLE-HAMILTON SQUARE AROUND 540 PM EDT... PRECAUTIONARY/PREPAREDNESS ACTIONS... IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS IMMEDIATELY LIGHTNING IS ONE OF NATURES GREATEST KILLERS. REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM EDT WEDNESDAY EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW JERSEY AND EASTERN PENNSYLVANIA. && LAT...LON 4037 7477 4025 7459 3989 7488 3999 7501 TIME...MOT...LOC 2109Z 217DEG 29KT 4004 7490 $$ EBERWINE
1 follow-up statement
000 WWUS51 KPHI 292138 SVSPHI SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 538 PM EDT WED JUL 29 2009 NJC005-021-PAC017-292215- /O.CON.KPHI.SV.W.0154.000000T0000Z-090729T2215Z/ MERCER NJ-BUCKS PA-BURLINGTON NJ- 538 PM EDT WED JUL 29 2009 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM EDT FOR EXTREME NORTH CENTRAL BURLINGTON...SOUTHEASTERN BUCKS AND MERCER COUNTIES... AT 536 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL. THIS STORM WAS LOCATED NEAR WHITE HORSE...OR NEAR TRENTON...MOVING NORTHEAST AT 35 MPH. THE SEVERE THUNDERSTORM WILL BE NEAR... EDINBURG AND LAWRENCEVILLE BY 545 PM EDT... PRECAUTIONARY/PREPAREDNESS ACTIONS... A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM EDT WEDNESDAY EVENING FOR DELAWARE AND NORTHEASTERN MARYLAND AND NEW JERSEY AND EASTERN PENNSYLVANIA. && LAT...LON 4021 7484 4037 7477 4025 7459 4010 7471 TIME...MOT...LOC 2138Z 216DEG 30KT 4022 7469 $$ EBERWINE
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 29, 10:15 AM EDT | Flash Flood Watch | PHI | Hunterdon, Mercer, Middlesex, Morris, Somerset, Sussex and 1 more | 17 hr |
| Jul 29, 12:55 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Mercer, Somerset | 65 min |
| Jul 29, 1:30 PM EDT | Areal Flood Advisory | PHI | Morris, Somerset | 3 hr |
| Jul 29, 1:35 PM EDT | Severe Thunderstorm Warning | PHI | Middlesex, Somerset | 55 min |
| Jul 29, 1:56 PM EDT | Severe Thunderstorm Warning | PHI | Sussex | 64 min |
| Jul 29, 2:10 PM EDT | Tornado Warning | PHI | Sussex | 65 min |
| Jul 29, 2:21 PM EDT | Areal Flood Advisory | PHI | Middlesex | 3 hr |
| Jul 29, 2:32 PM EDT | Flash Flood Warning | PHI | Sussex | 6 hr |
| Jul 29, 2:50 PM EDT | Flash Flood Warning | PHI | Middlesex | 4 hr |
| Jul 29, 3:52 PM EDT | Flash Flood Warning | PHI | Morris, Somerset | 4 hr |
| Jul 29, 5:48 PM EDT | Special Marine Warning | PHI | 57 min | |
| Jul 29, 5:55 PM EDT | Areal Flood Advisory | PHI | Burlington, Camden, Gloucester, Mercer, Middlesex, Salem | 4 hr |
| Jul 29, 6:11 PM EDT | Severe Thunderstorm Warning | PHI | Cumberland | 26 min |
| Jul 29, 6:26 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Camden, Gloucester | 38 min |
| Jul 29, 6:42 PM EDT | Areal Flood Advisory | PHI | Atlantic, Burlington, Camden, Cumberland, Gloucester, Mercer and 4 more | 3 hr |
| Jul 29, 6:42 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Camden | 39 min |
| Jul 29, 6:44 PM EDT | Flash Flood Warning | PHI | Middlesex, Somerset | 3 hr |
| Jul 29, 6:50 PM EDT | Areal Flood Advisory | PHI | Morris | 94 min |
| Jul 29, 7:31 PM EDT | Severe Thunderstorm Warning | PHI | Middlesex, Monmouth | 30 min |
| Jul 29, 11:48 AM EDT | Severe Thunderstorm Warning | PHI | Bucks, Chester, Montgomery | 72 min |
| Jul 29, 12:12 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Lehigh, Monroe, Northampton | 78 min |
| Jul 29, 1:51 PM EDT | Flash Flood Warning | PHI | Carbon, Monroe | 9 hr |
| Jul 29, 2:04 PM EDT | Severe Thunderstorm Warning | PHI | Monroe | 56 min |
| Jul 29, 2:11 PM EDT | Tornado Warning | PHI | Carbon, Monroe | 34 min |
| Jul 29, 5:28 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Lehigh, Northampton | 40 min |
Nearby
Severe Thunderstorm Warnings in New Jersey, 2009Severe Thunderstorm Warnings in Pennsylvania, 2009Every severe thunderstorm warning in 2009
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.