Alert archive / Wisconsin / Severe Thunderstorm Watches in 2002
Severe Thunderstorm Watch 518
The Storm Prediction Center issued this severe thunderstorm watch at Jul 21, 2002, 5:25 PM EDT for 5 counties in Michigan; 14 counties in Wisconsin. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 21, 2002, 5:25 PM EDT (21:25 UTC)
- Expired
- Jul 21, 2002, 11:00 PM EDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
Counties Delta County, MI, Dickinson County, MI, Luce County, MI, Menominee County, MI, Schoolcraft County, MI, Brown County, WI, Door County, WI, Florence County, WI, Forest County, WI, Kewaunee County, WI, Langlade County, WI, Marinette County, WI, Menominee County, WI, Oconto County, WI, Outagamie County, WI, Portage County, WI, Shawano County, WI, Waupaca County, WI, Wood County, WI
The radar
The Green Bay radar (KGRB), 74 km from the middle of the area, began a volume at 21:24 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 |
|---|---|---|---|---|
| Jul 21, 5:30 PM EDT | Severe Thunderstorm Warning | GRB | Florence, Forest | 75 min |
| Jul 21, 6:39 PM EDT | Severe Thunderstorm Warning | MQT | Delta, Menominee | 66 min |
| Jul 21, 6:52 PM EDT | Severe Thunderstorm Warning | MQT | Schoolcraft | 68 min |
| Jul 21, 7:04 PM EDT | Severe Thunderstorm Warning | GRB | Forest, Langlade | 56 min |
| Jul 21, 7:29 PM EDT | Severe Thunderstorm Warning | MQT | Luce | 76 min |
| Jul 21, 7:40 PM EDT | Severe Thunderstorm Warning | GRB | Marathon, Portage, Wood | 65 min |
| Jul 21, 7:47 PM EDT | Severe Thunderstorm Warning | GRB | Langlade, Menominee, Oconto, Shawano | 73 min |
| Jul 21, 7:57 PM EDT | Severe Thunderstorm Warning | MQT | Schoolcraft | 18 min |
| Jul 21, 8:00 PM EDT | Severe Thunderstorm Warning | GRB | Forest | 30 min |
The nearest sounding before it
Minneapolis, MN (KMPX), launched 12:00Z, 9.4 hours before the alert went out and 417 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
- 2410 J/kg
- Mixed-layer CIN
- -202 J/kg
- Mixed-layer LCL
- 1319 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 72 m²/s²
- 0-3 km storm-relative helicity
- 94 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 3:55 PM EDT | Severe Thunderstorm Watch | SPC | Gogebic, Iron | 6 hr |
| Jul 21, 7:25 PM EDT | Severe Thunderstorm Watch | SPC | Alpena, Antrim, Benzie, Charlevoix, Cheboygan, Chippewa and 15 more | 5 hr |
Nearby
Severe Thunderstorm Watches in Wisconsin, 2002Severe Thunderstorm Watches in Michigan, 2002Every severe thunderstorm watch in 2002
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.