Alert archive / Michigan / Severe Thunderstorm Watches in 2002
Severe Thunderstorm Watch 519
The Storm Prediction Center issued this severe thunderstorm watch at Jul 21, 2002, 7:25 PM EDT for 21 counties in Michigan. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 21, 2002, 7:25 PM EDT (23:25 UTC)
- Expired
- Jul 22, 2002, 12:00 AM EDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
All 21 counties
Alpena County, MI, Antrim County, MI, Benzie County, MI, Charlevoix County, MI, Cheboygan County, MI, Chippewa County, MI, Crawford County, MI, Emmet County, MI, Grand Traverse County, MI, Kalkaska County, MI, Leelanau County, MI, Mackinac County, MI, Manistee County, MI, Missaukee County, MI, Montmorency County, MI, Ogemaw County, MI, Oscoda County, MI, Otsego County, MI, Presque Isle County, MI, Roscommon County, MI, Wexford County, MI
The radar
The NCL Michigan radar (KAPX), 40 km from the middle of the area, began a volume at 23:26 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
3 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 7:39 PM EDT | Severe Thunderstorm Warning | APX | Mackinac | 51 min |
| Jul 21, 8:03 PM EDT | Severe Thunderstorm Warning | APX | Chippewa | 57 min |
| Jul 21, 8:30 PM EDT | Severe Thunderstorm Warning | APX | Mackinac | 60 min |
The nearest sounding before it
Alpena, MI (KAPX), launched 12:00Z, 11.4 hours before the alert went out and 215 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
- 2407 J/kg
- Mixed-layer CIN
- -69 J/kg
- Mixed-layer LCL
- 821 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 307 m²/s²
- 0-3 km storm-relative helicity
- 327 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 9.1
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, 5:25 PM EDT | Severe Thunderstorm Watch | SPC | Delta, Dickinson, Luce, Menominee, Schoolcraft | 6 hr |
Nearby
Severe 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.