Alert archive / New Jersey / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 198, NWS Philadelphia/Mount Holly

September 18, 2004Hunterdon County, Warren County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Sep 18, 2004, 6:22 AM EDT for Hunterdon County, Warren County, New Jersey. It was in force for 38 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: Sep 18, 2004, 6:22 AM EDT (10:22 UTC)
Expired: Sep 18, 2004, 7:00 AM EDT
In force: 38 min
Issued by: NWS Philadelphia/Mount Holly
Area: Counties, with a storm outline in the text

Counties Hunterdon County, NJ, Warren County, NJ

The radar

The Philadelphia radar (KDIX), 109 km from the middle of the area, began a volume at 10:22 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 00:00Z, 10.4 hours before the alert went out and 187 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 678 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 130 m²/s²
0-3 km storm-relative helicity: 180 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS51 KPHI 181022
SVRPHI
NJC019-041-181100-
/X.NEW.KPHI.SV.W.0002.040918T1022Z-040918T1100Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
622 AM EDT SAT SEP 18 2004

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WEST CENTRAL HUNTERDON COUNTY IN NORTHWEST NEW JERSEY
  WARREN COUNTY IN NORTHWEST NEW JERSEY

* UNTIL 700 AM EDT

* AT 617 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM.  THIS STORM WAS LOCATED 6 MILES SOUTHWEST OF
  ALPHA...OR ABOUT 9 MILES SOUTHEAST OF BETHLEHEM...AND MOVING
  NORTHEAST AT 35 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  BLOOMSBURY BY 630 AM EDT
  OXFORD...BELVIDERE AND WASHINGTON BY 645 AM EDT

DOPPLER RADAR HAS INDICATED SOME 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 4071 7519 4050 7515 4089 7482 4101 7508
      4087 7506

$$
MPD

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 18, 6:09 AM EDT	Flash Flood Warning	PHI	Warren	4 hr
Sep 18, 6:46 AM EDT	Flash Flood Warning	PHI	Sussex	3 hr
Sep 18, 7:04 AM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Warren	86 min
Sep 18, 7:07 AM EDT	Flash Flood Warning	PHI	Hunterdon	4 hr
Sep 18, 7:37 AM EDT	Flash Flood Warning	PHI	Morris	4 hr
Sep 18, 9:48 AM EDT	Flash Flood Warning	PHI	Sussex, Warren	4 hr

Nearby

Severe Thunderstorm Warnings in New Jersey, 2004 Every severe thunderstorm warning in 2004

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.