Alert archive / New Jersey / Severe Thunderstorm Watches in 2004
Severe Thunderstorm Watch 772
The Storm Prediction Center issued this severe thunderstorm watch at Aug 21, 2004, 1:25 PM EDT for 5 states. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 21, 2004, 1:25 PM EDT (17:25 UTC)
- Expired
- Aug 21, 2004, 6:00 PM EDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
All 37 counties
Bristol County, MA, Essex County, MA, Hampden County, MA, Hampshire County, MA, Middlesex County, MA, Norfolk County, MA, Suffolk County, MA, Worcester County, MA, Bergen County, NJ, Burlington County, NJ, Camden County, NJ, Essex County, NJ, Hudson County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Ocean County, NJ, Passaic County, NJ, Somerset County, NJ, Union County, NJ, Bronx County, NY, Kings County, NY, Nassau County, NY, New York County, NY, Putnam County, NY, Queens County, NY, Richmond County, NY, Rockland County, NY, Suffolk County, NY, Westchester County, NY, Bucks County, PA, Delaware County, PA, Philadelphia County, PA, Bristol County, RI, Kent County, RI, Providence County, RI, Washington County, RI
The radar
The Brookhaven radar (KOKX), 55 km from the middle of the area, began a volume at 17:27 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.
Warnings issued inside it
9 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 21, 1:29 PM EDT | Severe Thunderstorm Warning | OKX | Bergen | 46 min |
| Aug 21, 1:36 PM EDT | Severe Thunderstorm Warning | OKX | Rockland | 24 min |
| Aug 21, 1:38 PM EDT | Severe Thunderstorm Warning | PHI | Mercer | 22 min |
| Aug 21, 2:24 PM EDT | Severe Thunderstorm Warning | OKX | Union | 21 min |
| Aug 21, 2:31 PM EDT | Severe Thunderstorm Warning | OKX | Kings, Nassau, Queens | 44 min |
| Aug 21, 2:55 PM EDT | Flash Flood Warning | OKX | Hudson, Union | 2 hr |
| Aug 21, 3:14 PM EDT | Flash Flood Warning | OKX | Nassau, Queens, Suffolk | 2 hr |
| Aug 21, 3:16 PM EDT | Severe Thunderstorm Warning | OKX | Nassau, Suffolk | 44 min |
| Aug 21, 4:12 PM EDT | Severe Thunderstorm Warning | BOX | Norfolk, Plymouth, Suffolk | 33 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
Brookhaven, NY (KOKX), launched 12:00Z, 5.4 hours before the alert went out and 55 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
- 1043 J/kg
- Mixed-layer CIN
- -43 J/kg
- Mixed-layer LCL
- 802 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 156 m²/s²
- 0-3 km storm-relative helicity
- 180 m²/s²
- Significant tornado parameter
- 0.7
- Supercell composite
- 5.6
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 20, 8:22 PM EDT | Mesoscale Discussion | SPC | 83 min | |
| Aug 21, 11:48 AM EDT | Mesoscale Discussion | SPC | 117 min | |
| Aug 21, 3:08 PM EDT | Mesoscale Discussion | SPC | 2 hr | |
| Aug 21, 4:35 PM EDT | Mesoscale Discussion | SPC | 85 min |
Nearby
Severe Thunderstorm Watches in New Jersey, 2004Severe Thunderstorm Watches in New York, 2004Severe Thunderstorm Watches in Connecticut, 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; radar from the NEXRAD Level II archive.