Alert archive / North Dakota / Severe Thunderstorm Watches in 2011

Severe Thunderstorm Watch 422

June 3, 20118 counties in Minnesota; 18 counties in North Dakota

The Storm Prediction Center issued this severe thunderstorm watch at Jun 3, 2011, 1:25 AM CDT for 8 counties in Minnesota; 18 counties in North Dakota. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued: Jun 3, 2011, 1:25 AM CDT (06:25 UTC)
Expired: Jun 3, 2011, 5:05 AM CDT
In force: 4 hr
Issued by: the Storm Prediction Center
Largest hail expected: 1.5 in
Strongest gust expected: 60 kt

All 26 counties

Clay County, MN, Kittson County, MN, Marshall County, MN, Norman County, MN, Pennington County, MN, Polk County, MN, Red Lake County, MN, Roseau County, MN, Barnes County, ND, Cass County, ND, Dickey County, ND, Eddy County, ND, Foster County, ND, Grand Forks County, ND, Griggs County, ND, Kidder County, ND, LaMoure County, ND, Logan County, ND, Nelson County, ND, Pembina County, ND, Ransom County, ND, Sargent County, ND, Steele County, ND, Stutsman County, ND, Traill County, ND, Walsh County, ND

The radar

The Fargo/Grand Forks radar (KMVX), 44 km from the middle of the area, began a volume at 06:27 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: 5%
Ten or more severe wind reports: 40%
One or more gusts of 65 knots or more: 30%
Ten or more severe hail reports: 30%
One or more hailstones of 2 inches or more: 20%
Six or more combined severe hail and wind reports: 80%

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
Jun 3, 1:56 AM CDT	Severe Thunderstorm Warning	BIS	Foster, Stutsman, Wells	64 min
Jun 3, 2:11 AM CDT	Severe Thunderstorm Warning	FGF	Barnes, Griggs, Steele	64 min
Jun 3, 2:13 AM CDT	Tornado Warning	BIS	Stutsman	32 min
Jun 3, 2:32 AM CDT	Severe Thunderstorm Warning	FGF	Benson, Eddy, Grand Forks, Griggs, Nelson, Ramsey and 1 more	58 min
Jun 3, 2:34 AM CDT	Severe Thunderstorm Warning	FGF	Barnes, Steele, Traill	28 min
Jun 3, 3:12 AM CDT	Tornado Warning	FGF	Nelson	48 min
Jun 3, 3:30 AM CDT	Severe Thunderstorm Warning	FGF	Cavalier, Grand Forks, Nelson, Pembina, Walsh	60 min
Jun 3, 3:39 AM CDT	Tornado Warning	FGF	Pembina, Walsh	51 min
Jun 3, 4:10 AM CDT	Severe Thunderstorm Warning	FGF	Kittson, Marshall, Roseau	50 min
Jun 3, 4:23 AM CDT	Severe Thunderstorm Warning	FGF	Kittson	24 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 00:00Z, 6.4 hours before the alert went out and 248 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 2239 J/kg
Mixed-layer CIN: -143 J/kg
Mixed-layer LCL: 1718 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 88 m²/s²
0-3 km storm-relative helicity: 2 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 2.1

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 3, 1:11 AM CDT	Mesoscale Discussion	SPC	Kittson, Lake of the Woods, Marshall, Norman, Pennington, Polk and 2 more	94 min
Jun 3, 3:33 PM CDT	Mesoscale Discussion	SPC	Goodhue, Wabasha	87 min
Jun 3, 5:28 PM CDT	Tornado Watch	SPC	Aitkin, Carlton, Cook, Itasca, Lake, Pine and 1 more	5 hr
Jun 2, 7:22 PM CDT	Severe Thunderstorm Watch	SPC	Burleigh, Emmons, Grant, Kidder, Logan, McIntosh and 4 more	8 hr
Jun 2, 10:07 PM CDT	Mesoscale Discussion	SPC	Dickey, Emmons, Kidder, LaMoure, Logan, McIntosh and 2 more	83 min

Nearby

Severe Thunderstorm Watches in North Dakota, 2011 Severe Thunderstorm Watches in Minnesota, 2011 Every severe thunderstorm watch in 2011

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.