Alert archive / New Jersey / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 128, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 17, 2009, 8:51 PM EDT for Hunterdon County, Morris County, Somerset County, New Jersey. It was in force for 54 min. 4 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 17, 2009, 8:51 PM EDT (00:51 UTC)
- Expired
- Jul 17, 2009, 9:45 PM EDT
- In force
- 54 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Hunterdon County, NJ, Morris County, NJ, Somerset County, NJ
The radar
The Philadelphia radar (KDIX), 86 km from the middle of the area, began a volume at 00:53 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 17, 8:55 PM EDT | TSTM WND DMG | White House Station, NJ | TREES DOWN IN READINGTON TOWNSHIP. |
| Jul 17, 9:01 PM EDT | TSTM WND GST 44 | Somerville, NJ | A 44 MPH THUNDERSTORM WIND GUST WAS MEASURED AT THE SOMERVILLE AIRPORT. |
| Jul 17, 9:08 PM EDT | TSTM WND DMG | 2 W Raritan, NJ | TREES AND WIRES DOWN IN BRANCHBURG TOWNSHIP. |
| Jul 17, 9:10 PM EDT | TSTM WND DMG | Bernardsville, NJ | TREES DOWN. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Brookhaven, NY (KOKX), launched 00:00Z, 0.9 hours before the alert went out and 156 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
- 1160 J/kg
- Mixed-layer CIN
- -55 J/kg
- Mixed-layer LCL
- 625 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 67 m²/s²
- 0-3 km storm-relative helicity
- 105 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 2.6
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS51 KPHI 180051 SVRPHI NJC019-027-035-180145- /O.NEW.KPHI.SV.W.0128.090718T0051Z-090718T0145Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 851 PM EDT FRI JUL 17 2009 THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SOUTHERN MORRIS COUNTY IN NORTHERN NEW JERSEY... THIS INCLUDES THE CITY OF MORRISTOWN... SOMERSET COUNTY IN NORTHERN NEW JERSEY... THIS INCLUDES THE CITY OF SOMERVILLE... EASTERN HUNTERDON COUNTY IN NORTHWEST NEW JERSEY... * UNTIL 945 PM EDT * AT 850 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 CLOVERHILL...OR 11 MILES SOUTHWEST OF SOMERVILLE...AND MOVING NORTHEAST AT 30 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... FLAGTOWN AROUND 900 PM EDT... WHITE HOUSE STATION AND BRIDGEWATER AROUND 910 PM EDT... PEAPACK AND GLADSTONE AND FAR HILLS AROUND 925 PM EDT... BASKING RIDGE AROUND 930 PM EDT... CHESTER AROUND 935 PM EDT... SUCCASUNNA AROUND 940 PM EDT... LAT...LON 4090 7474 4078 7438 4041 7470 4047 7494 TIME...MOT...LOC 0051Z 204DEG 26KT 4049 7479 $$ KRUZDLO
The office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 17, 8:12 PM EDT | Areal Flood Advisory | PHI | Hunterdon, Mercer | 96 min |
| Jul 17, 9:17 PM EDT | Areal Flood Advisory | PHI | Hunterdon, Morris, Somerset, Sussex, Warren | 3 hr |
| Jul 17, 9:21 PM EDT | Severe Thunderstorm Warning | PHI | Morris, Sussex | 54 min |
Nearby
Severe Thunderstorm Warnings in New Jersey, 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.