Alert archive / Minnesota / Severe Thunderstorm Watches in 2013
Severe Thunderstorm Watch 528
The Storm Prediction Center issued this severe thunderstorm watch at Sep 18, 2013, 6:10 PM CDT for 8 counties in Minnesota; 6 counties in North Dakota. It took effect at Sep 18, 2013, 6:15 PM CDT. It was in force for 8 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 18, 2013, 6:10 PM CDT (23:10 UTC)
- In effect from
- Sep 18, 2013, 6:15 PM CDT
- Expired
- Sep 19, 2013, 2:00 AM CDT
- In force
- 8 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
Counties Becker County, MN, Clay County, MN, Grant County, MN, Mahnomen County, MN, Norman County, MN, Otter Tail County, MN, Wadena County, MN, Wilkin County, MN, Barnes County, ND, Cass County, ND, Ransom County, ND, Richland County, ND, Sargent County, ND, Traill County, ND
The radar
The Fargo/Grand Forks radar (KMVX), 112 km from the middle of the area, began a volume at 23:11 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
- 20%
- 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
8 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 18, 8:01 PM CDT | Severe Thunderstorm Warning | FGF | Sargent | 59 min |
| Sep 18, 8:49 PM CDT | Severe Thunderstorm Warning | FGF | Sargent | 56 min |
| Sep 18, 9:26 PM CDT | Severe Thunderstorm Warning | FGF | Sargent | 64 min |
| Sep 18, 9:41 PM CDT | Severe Thunderstorm Warning | FGF | Barnes, Cass | 64 min |
| Sep 18, 9:57 PM CDT | Severe Thunderstorm Warning | FGF | Richland, Sargent | 63 min |
| Sep 18, 10:11 PM CDT | Severe Thunderstorm Warning | FGF | Clay, Norman | 64 min |
| Sep 18, 10:36 PM CDT | Severe Thunderstorm Warning | FGF | Norman, Polk | 54 min |
| Sep 18, 11:43 PM CDT | Severe Thunderstorm Warning | FGF | Wilkin | 62 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
Aberdeen, SD (KABR), launched 12:00Z, 11.2 hours before the alert went out and 193 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
- 1053 J/kg
- Mixed-layer CIN
- -233 J/kg
- Mixed-layer LCL
- 515 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 100 m²/s²
- 0-3 km storm-relative helicity
- 134 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 18, 5:56 PM CDT | Mesoscale Discussion | SPC | Becker, Big Stone, Clay, Grant, Otter Tail, Stevens and 2 more | 64 min |
| Sep 17, 7:29 PM CDT | Mesoscale Discussion | SPC | Billings, Bowman, Golden Valley, McKenzie, Slope | 61 min |
| Sep 18, 2:16 PM CDT | Mesoscale Discussion | SPC | Adams, Bowman, Hettinger, Slope | 89 min |
| Sep 18, 4:56 PM CDT | Severe Thunderstorm Watch | SPC | Dickey, Emmons, LaMoure, Logan, McIntosh, Sioux | 7 hr |
Nearby
Severe Thunderstorm Watches in Minnesota, 2013Severe Thunderstorm Watches in North Dakota, 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.