Alert archive / New Jersey / Severe Thunderstorm Watches in 2004

Severe Thunderstorm Watch 156

May 7, 20044 states

The Storm Prediction Center issued this severe thunderstorm watch at May 7, 2004, 1:40 PM EDT for 4 states. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued
May 7, 2004, 1:40 PM EDT (17:40 UTC)
Expired
May 7, 2004, 5:00 PM EDT
In force
3 hr
Issued by
the Storm Prediction Center

Counties Kent County, DE, New Castle County, DE, Sussex County, DE, Caroline County, MD, Cecil County, MD, Kent County, MD, Queen Anne's County, MD, Talbot County, MD, Atlantic County, NJ, Burlington County, NJ, Camden County, NJ, Cape May County, NJ, Cumberland County, NJ, Gloucester County, NJ, Ocean County, NJ, Salem County, NJ, Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA

Warnings issued inside it

2 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
May 7, 1:58 PM EDTSevere Thunderstorm WarningPHICecil77 min
May 7, 4:20 PM EDTSevere Thunderstorm WarningPHISussex70 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 5.7 hours before the alert went out and 75 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-pSkew-T log-p diagram, Phillips Aaf/Abe, MD at 12:00Z on 2004-05-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 443 joules per kilogram.LCLLFCEL10008507005003002001001 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Phillips Aaf/Abe, MD at 12:00Z on 2004-05-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 170 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
443 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
793 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
170 m²/s²
0-3 km storm-relative helicity
152 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 7, 10:29 AM EDTMesoscale DiscussionSPCNew Castle91 min
May 7, 1:24 PM EDTMesoscale DiscussionSPCKent, New Castle96 min
May 7, 4:35 PM EDTSevere Thunderstorm WatchSPCKent, Sussex5 hr
May 7, 6:17 PM EDTMesoscale DiscussionSPCKent, Sussex118 min
May 7, 11:00 AM EDTSevere Thunderstorm WatchSPCAllegany, Anne Arundel, Baltimore, Carroll, Frederick, Garrett and 5 more6 hr
May 7, 1:49 PM EDTMesoscale DiscussionSPCAllegany, Garrett, Washington86 min
May 6, 11:05 PM EDTMesoscale DiscussionSPCClarion, Crawford, Erie, Forest, Lawrence, McKean and 3 more85 min
May 6, 11:20 PM EDTSevere Thunderstorm WatchSPCArmstrong, Beaver, Butler, Clarion, Clearfield, Crawford and 9 more5 hr
May 7, 3:13 AM EDTMesoscale DiscussionSPCArmstrong, Beaver, Butler, Clarion, Clearfield, Crawford and 9 more62 min

Nearby

Severe Thunderstorm Watches in New Jersey, 2004Severe Thunderstorm Watches in Maryland, 2004Severe Thunderstorm Watches in Pennsylvania, 2004Every severe thunderstorm watch 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.