Alert archive / Minnesota / Severe Thunderstorm Watches in 2020
Severe Thunderstorm Watch 435
The Storm Prediction Center issued this severe thunderstorm watch at Aug 14, 2020, 6:41 AM CDT for 14 counties in Minnesota; 7 counties in North Dakota. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 14, 2020, 6:41 AM CDT (11:41 UTC)
- Expired
- Aug 14, 2020, 1:51 PM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 65 kt
All 21 counties
Becker County, MN, Beltrami County, MN, Clay County, MN, Clearwater County, MN, Grant County, MN, Hubbard County, MN, Mahnomen County, MN, Norman County, MN, Otter Tail County, MN, Pennington County, MN, Polk County, MN, Red Lake County, MN, Wadena County, MN, Wilkin County, MN, Barnes County, ND, Cass County, ND, Grand Forks County, ND, Ransom County, ND, Richland County, ND, Steele County, ND, Traill County, ND
The radar
The Fargo/Grand Forks radar (KMVX), 57 km from the middle of the area, began a volume at 11:42 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
- 5%
- Ten or more severe wind reports
- 60%
- One or more gusts of 65 knots or more
- 40%
- Ten or more severe hail reports
- 60%
- One or more hailstones of 2 inches or more
- 40%
- Six or more combined severe hail and wind reports
- 95%
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 |
|---|---|---|---|---|
| Aug 14, 7:16 AM CDT | Severe Thunderstorm Warning | FGF | Cass, Traill | 29 min |
| Aug 14, 8:17 AM CDT | Severe Thunderstorm Warning | FGF | Barnes, Cass, Steele, Traill | 23 min |
| Aug 14, 8:44 AM CDT | Severe Thunderstorm Warning | FGF | Barnes, Cass, Ransom, Richland, Sargent | 61 min |
| Aug 14, 9:00 AM CDT | Tornado Warning | FGF | Ransom | 30 min |
| Aug 14, 9:15 AM CDT | Severe Thunderstorm Warning | FGF | Norman, Polk, Red Lake | 18 min |
| Aug 14, 9:38 AM CDT | Severe Thunderstorm Warning | FGF | Clay, Norman, Wilkin | 52 min |
| Aug 14, 10:14 AM CDT | Severe Thunderstorm Warning | FGF | Becker, Clay, Clearwater, Mahnomen, Norman, Otter Tail | 46 min |
| Aug 14, 10:55 AM CDT | Severe Thunderstorm Warning | FGF | Becker, Beltrami, Clearwater, Hubbard, Mahnomen | 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
Aberdeen, SD (KABR), launched 00:00Z, 11.7 hours before the alert went out and 271 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
- 4257 J/kg
- Mixed-layer CIN
- -11 J/kg
- Mixed-layer LCL
- 1370 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 68 m²/s²
- 0-3 km storm-relative helicity
- 82 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 7.0
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 13, 8:26 PM CDT | Mesoscale Discussion | SPC | Becker, Beltrami, Clay, Clearwater, Hubbard, Koochiching and 11 more | 94 min |
| Aug 14, 12:33 AM CDT | Mesoscale Discussion | SPC | Aitkin, Becker, Benton, Cass, Crow Wing, Douglas and 15 more | 87 min |
| Aug 14, 6:06 AM CDT | Mesoscale Discussion | SPC | Becker, Beltrami, Clay, Clearwater, Mahnomen, Marshall and 5 more | 114 min |
| Aug 14, 10:19 AM CDT | Mesoscale Discussion | SPC | Becker, Beltrami, Clay, Clearwater, Douglas, Grant and 9 more | 86 min |
| Aug 14, 1:57 PM CDT | Mesoscale Discussion | SPC | Benton, Big Stone, Blue Earth, Brown, Carver, Chippewa and 38 more | 2 hr |
| Aug 14, 2:17 PM CDT | Severe Thunderstorm Watch | SPC | Cottonwood, Jackson, Lincoln, Lyon, Murray, Nobles and 2 more | 6 hr |
| Aug 14, 2:36 PM CDT | Tornado Watch | SPC | Benton, Big Stone, Brown, Chippewa, Douglas, Grant and 18 more | 5 hr |
| Aug 14, 4:53 PM CDT | Mesoscale Discussion | SPC | Big Stone, Chippewa, Douglas, Grant, Kandiyohi, Lac qui Parle and 15 more | 97 min |
| Aug 14, 5:35 PM CDT | Mesoscale Discussion | SPC | Brown, Cottonwood, Jackson, Murray, Nobles, Rock and 1 more | 85 min |
| Aug 14, 5:38 PM CDT | Severe Thunderstorm Watch | SPC | Aitkin, Anoka, Carlton, Carver, Chisago, Crow Wing and 13 more | 5 hr |
| Aug 13, 11:28 PM CDT | Mesoscale Discussion | SPC | Adams, Bowman, Burleigh, Emmons, Grant, Hettinger and 3 more | 2 hr |
| Aug 14, 12:50 AM CDT | Severe Thunderstorm Watch | SPC | Adams, Burleigh, Dickey, Emmons, Grant, Hettinger and 8 more | 8 hr |
| Aug 14, 2:12 AM CDT | Mesoscale Discussion | SPC | Adams, Emmons, Grant, Hettinger, Morton, Sioux | 93 min |
| Aug 14, 5:14 AM CDT | Mesoscale Discussion | SPC | Emmons, Grant, Kidder, LaMoure, Logan, McIntosh and 2 more | 91 min |
Nearby
Severe Thunderstorm Watches in Minnesota, 2020Severe Thunderstorm Watches in North Dakota, 2020Every severe thunderstorm watch in 2020
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.