Alert archive / New Jersey / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 142, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 26, 2009, 8:16 PM EDT for Burlington County, Mercer County, Middlesex County, New Jersey; Bucks County, Pennsylvania. It was in force for 59 min. 3 reports 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 26, 2009, 8:16 PM EDT (00:16 UTC)
- Expired
- Jul 26, 2009, 9:15 PM EDT
- In force
- 59 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Burlington County, NJ, Mercer County, NJ, Middlesex County, NJ, Bucks County, PA
The radar
The Philadelphia radar (KDIX), 43 km from the middle of the area, began a volume at 00:15 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 26, 8:25 PM EDT | TSTM WND DMG | Hamilton Square, NJ | TREE DOWN ON HOUSE. |
| Jul 26, 8:30 PM EDT | TSTM WND DMG | White Horse, NJ | TWO 50 TO 80 FOOT TREES COMPLETELY UPROOTED IN WHITE HORSE/YARDVILLE. |
| Jul 26, 8:40 PM EDT | HAIL 0.25 | Hamilton, NJ | PEA SIZE HAIL IN HAMILTON TWP. |
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 26, 3:51 PM EDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Brookhaven, NY (KOKX), launched 00:00Z, 0.3 hours before the alert went out and 175 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
- 807 J/kg
- Mixed-layer CIN
- -91 J/kg
- Mixed-layer LCL
- 738 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 160 m²/s²
- 0-3 km storm-relative helicity
- 210 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 5.8
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS51 KPHI 270016 SVRPHI NJC005-021-023-PAC017-270115- /O.NEW.KPHI.SV.W.0142.090727T0016Z-090727T0115Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 816 PM EDT SUN JUL 26 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... SOUTHWESTERN MIDDLESEX COUNTY IN NORTHERN NEW JERSEY... SOUTHEASTERN BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA... NORTH CENTRAL BURLINGTON COUNTY IN SOUTHERN NEW JERSEY... * UNTIL 915 PM EDT * AT 812 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR FLORENCE...OR 7 MILES SOUTH OF TRENTON...AND MOVING NORTHEAST AT 25 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... BORDENTOWN AROUND 820 PM EDT... WHITE HORSE AND TRENTON AROUND 830 PM EDT... MERCERVILLE-HAMILTON SQUARE AROUND 840 PM EDT... EDINBURG...WINDSOR AND 6 MILES SOUTHEAST OF LAWRENCEVILLE AROUND 850 PM EDT... PRINCETON AROUND 900 PM EDT... 6 MILES NORTHWEST OF CLEARBROOK PARK AROUND 910 PM EDT... THIS STORM HAS BEEN BACKBUILDING ACROSS NORTHERN BURLINGTON COUNTY. PRECAUTIONARY/PREPAREDNESS ACTIONS... IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...FREQUENT 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 1100 PM EDT SUNDAY EVENING FOR NEW JERSEY AND EASTERN PENNSYLVANIA. && LAT...LON 4037 7477 4031 7445 4003 7486 4007 7492 TIME...MOT...LOC 0015Z 212DEG 17KT 4013 7474 $$ GORSE
1 follow-up statement
000 WWUS51 KPHI 270040 SVSPHI SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 840 PM EDT SUN JUL 26 2009 NJC005-PAC017-270048- /O.CAN.KPHI.SV.W.0142.000000T0000Z-090727T0115Z/ BUCKS PA-BURLINGTON NJ- 840 PM EDT SUN JUL 26 2009 ...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL BURLINGTON AND SOUTHEASTERN BUCKS COUNTIES IS CANCELLED... THE SEVERE THUNDERSTORM HAS MOVED OUT OF THE AREA, THEREFORE THE WARNING HAS BEEN CANCELLED. WIND DAMAGE WAS REPORTED IN MANSFIELD TOWNSHIP AND BORDENTOWN IN BURLINGTON COUNTY. A SEVERE THUNDERSTORM WATCH ALSO REMAINS IN EFFECT UNTIL 1100 PM EDT SUNDAY EVENING FOR NEW JERSEY AND EASTERN PENNSYLVANIA. LAT...LON 4037 7477 4031 7445 4016 7472 4019 7474 TIME...MOT...LOC 0038Z 212DEG 17KT 4022 7467 $$ NJC021-023-270115- /O.CON.KPHI.SV.W.0142.000000T0000Z-090727T0115Z/ MERCER NJ-MIDDLESEX NJ- 840 PM EDT SUN JUL 26 2009 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM EDT FOR SOUTHWESTERN MIDDLESEX AND EASTERN MERCER COUNTIES... AT 838 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR MERCERVILLE-HAMILTON SQUARE...OR NEAR TRENTON...MOVING NORTHEAST AT 20 MPH. THIS STORM PRODUCED WIND DAMAGE IN NORTHERN BURLINGTON COUNTY. THE SEVERE THUNDERSTORM WILL BE NEAR... 6 MILES SOUTHEAST OF LAWRENCEVILLE BY 845 PM EDT... EDINBURG AND WINDSOR BY 850 PM EDT... PRINCETON JUNCTION...PRINCETON AND HIGHTSTOWN BY 900 PM EDT... 6 MILES NORTHWEST OF CLEARBROOK PARK BY 910 PM EDT... PRECAUTIONARY/PREPAREDNESS ACTIONS... IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS IMMEDIATELY LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS. REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM EDT SUNDAY EVENING FOR NEW JERSEY AND EASTERN PENNSYLVANIA. && LAT...LON 4037 7477 4031 7445 4016 7472 4019 7474 TIME...MOT...LOC 0038Z 212DEG 17KT 4022 7467 $$ GORSE
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 26, 9:57 PM EDT | Areal Flood Advisory | PHI | Mercer, Middlesex, Morris, Somerset | 2 hr |
| Jul 27, 2:46 PM EDT | Special Marine Warning | PHI | 89 min | |
| Jul 27, 2:58 PM EDT | Special Marine Warning | PHI | 92 min | |
| Jul 27, 4:10 PM EDT | Special Marine Warning | PHI | 2 hr | |
| Jul 27, 4:25 PM EDT | Severe Thunderstorm Warning | PHI | Cape May | 54 min |
| Jul 27, 6:25 PM EDT | Special Marine Warning | PHI | 95 min | |
| Jul 26, 8:26 PM EDT | Severe Thunderstorm Warning | PHI | Berks, Carbon, Lehigh, Northampton | 37 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.