Alert archive / Michigan / Severe Thunderstorm Watches in 2013
Severe Thunderstorm Watch 522
The Storm Prediction Center issued this severe thunderstorm watch at Sep 11, 2013, 4:39 PM EDT for 5 counties in Indiana; 23 counties in Michigan. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 11, 2013, 4:39 PM EDT (20:39 UTC)
- Expired
- Sep 11, 2013, 8:11 PM EDT
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 28 counties
Elkhart County, IN, LaGrange County, IN, LaPorte County, IN, Saint Joseph County, IN, Steuben County, IN, Barry County, MI, Berrien County, MI, Branch County, MI, Calhoun County, MI, Cass County, MI, Eaton County, MI, Genesee County, MI, Hillsdale County, MI, Ingham County, MI, Jackson County, MI, Kalamazoo County, MI, Lapeer County, MI, Lenawee County, MI, Livingston County, MI, Macomb County, MI, Monroe County, MI, Oakland County, MI, Saint Clair County, MI, Saint Joseph County, MI, Shiawassee County, MI, Van Buren County, MI, Washtenaw County, MI, Wayne County, MI
The radar
The Grand Rapids radar (KGRR), 73 km from the middle of the area, began a volume at 20:40 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.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 10%
- One or more EF2 to EF5 tornadoes
- 2%
- Ten or more severe wind reports
- 30%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 30%
- One or more hailstones of 2 inches or more
- 30%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
10 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 11, 4:46 PM EDT | Severe Thunderstorm Warning | GRR | Calhoun, Jackson | 59 min |
| Sep 11, 5:12 PM EDT | Severe Thunderstorm Warning | GRR | Ingham, Jackson | 63 min |
| Sep 11, 5:20 PM EDT | Severe Thunderstorm Warning | DTX | Genesee | 55 min |
| Sep 11, 5:27 PM EDT | Severe Thunderstorm Warning | GRR | Calhoun | 63 min |
| Sep 11, 5:45 PM EDT | Severe Thunderstorm Warning | IWX | Branch | 45 min |
| Sep 11, 5:55 PM EDT | Severe Thunderstorm Warning | DTX | Livingston, Washtenaw | 65 min |
| Sep 11, 6:01 PM EDT | Severe Thunderstorm Warning | DTX | Macomb, Oakland | 89 min |
| Sep 11, 6:33 PM EDT | Severe Thunderstorm Warning | DTX | Saint Clair | 42 min |
| Sep 11, 6:47 PM EDT | Severe Thunderstorm Warning | IWX | DeKalb, Steuben | 28 min |
| Sep 11, 6:53 PM EDT | Severe Thunderstorm Warning | DTX | Wayne | 82 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
Green Bay/Straub, WI (KGRB), launched 12:00Z, 8.7 hours before the alert went out and 342 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
- 68 J/kg
- Mixed-layer CIN
- -108 J/kg
- Mixed-layer LCL
- 1010 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 24 m²/s²
- 0-3 km storm-relative helicity
- 100 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 |
|---|---|---|---|---|
| Sep 11, 4:21 PM EDT | Mesoscale Discussion | SPC | DeKalb, Elkhart, LaGrange, LaPorte, Noble, Porter and 2 more | 114 min |
Nearby
Severe Thunderstorm Watches in Michigan, 2013Severe Thunderstorm Watches in Indiana, 2013Every severe thunderstorm watch in 2013
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.