Alert archive / New Jersey / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 234, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Oct 24, 2009, 6:28 PM EDT for Hunterdon County, Somerset County, New Jersey; Bucks County, Pennsylvania. It was in force for 47 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 24, 2009, 6:28 PM EDT (22:28 UTC)
- Expired
- Oct 24, 2009, 7:15 PM EDT
- In force
- 47 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Hunterdon County, NJ, Somerset County, NJ, Bucks County, PA
The radar
The Philadelphia radar (KDIX), 66 km from the middle of the area, began a volume at 22:29 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 nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 10.5 hours before the alert went out and 178 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
- 74 J/kg
- Mixed-layer CIN
- -42 J/kg
- Mixed-layer LCL
- 485 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 282 m²/s²
- 0-3 km storm-relative helicity
- 325 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.6
The text
As transmitted, in the capitals the NWS used until 2016.
000
WUUS51 KPHI 242228
SVRPHI
NJC019-035-PAC017-242315-
/O.NEW.KPHI.SV.W.0234.091024T2228Z-091024T2315Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
628 PM EDT SAT OCT 24 2009
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
WEST CENTRAL SOMERSET COUNTY IN NORTHERN NEW JERSEY...
THIS INCLUDES THE CITY OF SOMERVILLE...
HUNTERDON COUNTY IN NORTHWEST NEW JERSEY...
CENTRAL BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...
* UNTIL 715 PM EDT
* AT 627 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS
OF 60 MPH. THIS STORM WAS LOCATED NEAR STOCKTON...OR 17 MILES
NORTHWEST OF TRENTON...AND MOVING NORTHEAST AT 45 MPH.
* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
SERGEANTSVILLE...SAND BROOK...FLEMINGTON...CLOVERHILL...
ANNANDALE...LEBANON...FLAGTOWN...WHITE HOUSE STATION AND
BRIDGEWATER
PRECAUTIONARY/PREPAREDNESS ACTIONS...
DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THIS STORM.
WHILE NOT IMMEDIATELY LIKELY...A TORNADO MAY STILL DEVELOP. IF A
TORNADO IS SPOTTED...ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A
STURDY STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.
&&
LAT...LON 4034 7490 4033 7493 4032 7492 4019 7503
4054 7505 4071 7479 4056 7459
TIME...MOT...LOC 2228Z 229DEG 38KT 4039 7498
$$
RNS2 follow-up statements
000
WWUS51 KPHI 242243
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
643 PM EDT SAT OCT 24 2009
PAC017-242254-
/O.CAN.KPHI.SV.W.0234.000000T0000Z-091024T2315Z/
BUCKS PA-
643 PM EDT SAT OCT 24 2009
...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL BUCKS COUNTY IS
CANCELLED...
LAT...LON 4036 7489 4038 7491 4036 7490 4041 7493
4064 7486 4071 7479 4056 7459
TIME...MOT...LOC 2244Z 229DEG 38KT 4050 7481
$$
NJC019-035-242315-
/O.CON.KPHI.SV.W.0234.000000T0000Z-091024T2315Z/
HUNTERDON NJ-SOMERSET NJ-
643 PM EDT SAT OCT 24 2009
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM EDT
FOR WEST CENTRAL SOMERSET AND EASTERN HUNTERDON COUNTIES...
AT 642 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR FLEMINGTON...OR 13
MILES SOUTHWEST OF SOMERVILLE...MOVING NORTHEAST AT 45 MPH.
OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
LEBANON...FLAGTOWN...WHITE HOUSE STATION...RARITAN AND BRIDGEWATER
PRECAUTIONARY/PREPAREDNESS ACTIONS...
THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.
&&
LAT...LON 4036 7489 4038 7491 4036 7490 4041 7493
4064 7486 4071 7479 4056 7459
TIME...MOT...LOC 2244Z 229DEG 38KT 4050 7481
$$
RNS000
WWUS51 KPHI 242256
SVSPHI
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
656 PM EDT SAT OCT 24 2009
NJC019-242306-
/O.CAN.KPHI.SV.W.0234.000000T0000Z-091024T2315Z/
HUNTERDON NJ-
656 PM EDT SAT OCT 24 2009
...THE SEVERE THUNDERSTORM WARNING FOR EXTREME EAST CENTRAL HUNTERDON
COUNTY IS CANCELLED...
LAT...LON 4056 7460 4048 7471 4056 7470 4065 7472
4056 7459
TIME...MOT...LOC 2256Z 229DEG 38KT 4058 7469
$$
NJC035-242315-
/O.CON.KPHI.SV.W.0234.000000T0000Z-091024T2315Z/
SOMERSET NJ-
656 PM EDT SAT OCT 24 2009
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM EDT
FOR CENTRAL SOMERSET COUNTY...
AT 656 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH. THIS STORM WAS LOCATED NEAR RARITAN...OR NEAR
SOMERVILLE...MOVING NORTHEAST AT 45 MPH.
THE SEVERE THUNDERSTORM WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS
OF THE INDICATED COUNTY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE
IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD
TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.
&&
LAT...LON 4056 7460 4048 7471 4056 7470 4065 7472
4056 7459
TIME...MOT...LOC 2256Z 229DEG 38KT 4058 7469
$$
RNSThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 24, 4:49 PM EDT | Areal Flood Advisory | PHI | Hunterdon, Mercer, Somerset, Sussex, Warren | 4 hr |
| Oct 24, 6:19 PM EDT | Severe Thunderstorm Warning | PHI | Salem | 26 min |
| Oct 24, 6:31 PM EDT | Tornado Warning | PHI | Hunterdon | 10 min |
| Oct 24, 7:16 PM EDT | Flash Flood Warning | PHI | Hunterdon, Morris, Somerset | 3 hr |
| Oct 24, 7:24 PM EDT | Areal Flood Advisory | PHI | Burlington, Camden, Gloucester, Middlesex, Monmouth, Ocean and 1 more | 3 hr |
| Oct 24, 3:30 PM EDT | Areal Flood Advisory | PHI | Berks, Carbon, Chester, Lehigh, Monroe, Northampton | 4 hr |
| Oct 24, 4:55 PM EDT | Areal Flood Advisory | PHI | Bucks, Montgomery | 4 hr |
| Oct 24, 5:41 PM EDT | Flash Flood Warning | PHI | Chester, Delaware | 3 hr |
| Oct 24, 6:02 PM EDT | Flash Flood Warning | PHI | Montgomery | 3 hr |
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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.