Alert archive / New Jersey / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 129, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 17, 2009, 9:21 PM EDT for Morris County, Sussex County, New Jersey. It was in force for 54 min. 2 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, 9:21 PM EDT (01:21 UTC)
- Expired
- Jul 17, 2009, 10:15 PM EDT
- In force
- 54 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
Counties Morris County, NJ, Sussex County, NJ
The radar
The Philadelphia radar (KDIX), 120 km from the middle of the area, began a volume at 01:23 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, 9:27 PM EDT | TSTM WND DMG | Dover, NJ | TREES DOWN. |
| Jul 17, 9:27 PM EDT | TSTM WND DMG | Wharton, 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, 1.4 hours before the alert went out and 131 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 180121
SVRPHI
NJC027-037-180215-
/O.NEW.KPHI.SV.W.0129.090718T0121Z-090718T0215Z/
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
921 PM EDT FRI JUL 17 2009
THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A
* SEVERE THUNDERSTORM WARNING FOR...
NORTHERN MORRIS COUNTY IN NORTHERN NEW JERSEY...
EASTERN SUSSEX COUNTY IN NORTHWEST NEW JERSEY...
* UNTIL 1015 PM EDT
* AT 920 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
DOVER...OR NEAR MORRISTOWN...AND MOVING NORTH AT 40 MPH.
* THE SEVERE THUNDERSTORM WILL BE NEAR...
6 MILES WEST OF PARSIPPANY AROUND 930 PM EDT...
LAKE TELEMARK AND 6 MILES WEST OF BOONTON AROUND 935 PM EDT...
KINNELON AROUND 940 PM EDT...
GREEN POND AROUND 945 PM EDT...
HIGHLAND LAKE AROUND 1000 PM EDT...
LAT...LON 4120 7437 4118 7437 4109 7449 4104 7449
4105 7444 4102 7442 4101 7432 4097 7427
4089 7427 4089 7433 4086 7431 4077 7439
4089 7474 4131 7459
TIME...MOT...LOC 0121Z 202DEG 33KT 4083 7456
$$
KRUZDLOThe 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, 8:51 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Morris, Somerset | 54 min |
| Jul 17, 9:17 PM EDT | Areal Flood Advisory | PHI | Hunterdon, Morris, Somerset, Sussex, Warren | 3 hr |
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.