Alert archive / North Dakota / Severe Thunderstorm Watches in 2015
Severe Thunderstorm Watch 403
The Storm Prediction Center issued this severe thunderstorm watch at Jul 11, 2015, 5:40 PM CDT for 36 counties in North Dakota; 16 counties in South Dakota. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 11, 2015, 5:40 PM CDT (22:40 UTC)
- Expired
- Jul 12, 2015, 1:00 AM CDT
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 65 kt
All 52 counties
Barnes County, ND, Benson County, ND, Bottineau County, ND, Burke County, ND, Burleigh County, ND, Cavalier County, ND, Dickey County, ND, Eddy County, ND, Emmons County, ND, Foster County, ND, Grant County, ND, Griggs County, ND, Kidder County, ND, LaMoure County, ND, Logan County, ND, McHenry County, ND, McIntosh County, ND, McLean County, ND, Mercer County, ND, Morton County, ND, Mountrail County, ND, Nelson County, ND, Oliver County, ND, Pierce County, ND, Ramsey County, ND, Ransom County, ND, Renville County, ND, Rolette County, ND, Sargent County, ND, Sheridan County, ND, Sioux County, ND, Steele County, ND, Stutsman County, ND, Towner County, ND, Ward County, ND, Wells County, ND, Brown County, SD, Campbell County, SD, Clark County, SD, Codington County, SD, Day County, SD, Deuel County, SD, Edmunds County, SD, Faulk County, SD, Grant County, SD, Hamlin County, SD, Marshall County, SD, McPherson County, SD, Potter County, SD, Roberts County, SD, Spink County, SD, Walworth County, SD
The radar
The Bismarck radar (KBIS), 70 km from the middle of the area, began a volume at 22:40 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
- 30%
- Ten or more severe hail reports
- 40%
- 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 |
|---|---|---|---|---|
| Jul 11, 5:58 PM CDT | Severe Thunderstorm Warning | BIS | Burleigh, McLean, Sheridan | 62 min |
| Jul 11, 7:13 PM CDT | Severe Thunderstorm Warning | BIS | Burleigh, McLean | 62 min |
| Jul 11, 8:08 PM CDT | Severe Thunderstorm Warning | BIS | Bottineau, Rolette | 52 min |
| Jul 11, 9:17 PM CDT | Severe Thunderstorm Warning | FGF | Benson, Towner | 58 min |
| Jul 11, 9:21 PM CDT | Severe Thunderstorm Warning | BIS | Rolette | 54 min |
| Jul 11, 10:10 PM CDT | Tornado Warning | FGF | Benson | 50 min |
| Jul 11, 11:01 PM CDT | Severe Thunderstorm Warning | FGF | Benson, Ramsey, Towner | 59 min |
| Jul 11, 11:24 PM CDT | Severe Thunderstorm Warning | FGF | Benson, Ramsey | 36 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
Bismarck Municip, ND (KBIS), launched 12:00Z, 10.7 hours before the alert went out and 68 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
- 841 J/kg
- Mixed-layer CIN
- -278 J/kg
- Mixed-layer LCL
- 1498 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 85 m²/s²
- 0-3 km storm-relative helicity
- 129 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.4
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 11, 5:00 PM CDT | Mesoscale Discussion | SPC | Barnes, Benson, Bottineau, Burke, Burleigh, Dickey and 23 more | 60 min |
Nearby
Severe Thunderstorm Watches in North Dakota, 2015Severe Thunderstorm Watches in South Dakota, 2015Every severe thunderstorm watch in 2015
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.