Alert archive / Minnesota / Severe Thunderstorm Watches in 2018

Severe Thunderstorm Watch 233

June 28, 201820 counties in Minnesota; 4 counties in North Dakota; 5 counties in Wisconsin

The Storm Prediction Center issued this severe thunderstorm watch at Jun 28, 2018, 1:33 PM CDT for 20 counties in Minnesota; 4 counties in North Dakota; 5 counties in Wisconsin. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Jun 28, 2018, 1:33 PM CDT (18:33 UTC)
Expired
Jun 28, 2018, 7:34 PM CDT
In force
6 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt
All 29 counties

Aitkin County, MN, Becker County, MN, Beltrami County, MN, Carlton County, MN, Cass County, MN, Clay County, MN, Clearwater County, MN, Crow Wing County, MN, Hubbard County, MN, Itasca County, MN, Koochiching County, MN, Mahnomen County, MN, Norman County, MN, Otter Tail County, MN, Pennington County, MN, Pine County, MN, Polk County, MN, Red Lake County, MN, Saint Louis County, MN, Wadena County, MN, Cass County, ND, Grand Forks County, ND, Steele County, ND, Traill County, ND, Bayfield County, WI, Burnett County, WI, Douglas County, WI, Sawyer County, WI, Washburn County, WI

The radar

The Fargo/Grand Forks radar (KMVX), 176 km from the middle of the area, began a volume at 18:35 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
20%
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
90%

Warnings issued inside it

23 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Jun 28, 1:34 PM CDTSevere Thunderstorm WarningFGFNorman, Polk41 min
Jun 28, 1:41 PM CDTSevere Thunderstorm WarningFGFNorman, Polk34 min
Jun 28, 2:13 PM CDTSevere Thunderstorm WarningFGFClearwater, Mahnomen, Norman, Polk, Red Lake47 min
Jun 28, 2:18 PM CDTSevere Thunderstorm WarningFGFBeltrami42 min
Jun 28, 2:30 PM CDTSevere Thunderstorm WarningDLHCass, Itasca45 min
Jun 28, 2:48 PM CDTTornado WarningFGFMahnomen, Norman, Polk27 min
Jun 28, 2:52 PM CDTSevere Thunderstorm WarningDLHCass, Itasca38 min
Jun 28, 2:59 PM CDTSevere Thunderstorm WarningFGFBeltrami, Clearwater, Polk, Red Lake46 min
Jun 28, 3:00 PM CDTSevere Thunderstorm WarningDLHAitkin, Carlton, Saint Louis30 min
Jun 28, 3:05 PM CDTSevere Thunderstorm WarningFGFGrand Forks, Nelson40 min
Jun 28, 3:25 PM CDTSevere Thunderstorm WarningDLHAitkin, Cass, Itasca35 min
Jun 28, 3:30 PM CDTSevere Thunderstorm WarningDLHAitkin, Carlton, Saint Louis30 min
Jun 28, 3:40 PM CDTSevere Thunderstorm WarningFGFPolk50 min
Jun 28, 3:44 PM CDTSevere Thunderstorm WarningFGFBeltrami26 min
Jun 28, 3:49 PM CDTSevere Thunderstorm WarningDLHCarlton, Saint Louis41 min
Jun 28, 3:55 PM CDTSevere Thunderstorm WarningDLHAitkin, Cass, Itasca50 min
Jun 28, 4:26 PM CDTSevere Thunderstorm WarningDLHCarlton, Pine49 min
Jun 28, 4:35 PM CDTSevere Thunderstorm WarningDLHAitkin, Carlton, Saint Louis40 min
Jun 28, 5:12 PM CDTSevere Thunderstorm WarningDLHCarlton, Pine48 min
Jun 28, 5:15 PM CDTSevere Thunderstorm WarningDLHAitkin, Carlton, Pine30 min
Jun 28, 5:34 PM CDTSevere Thunderstorm WarningDLHAitkin, Carlton, Pine26 min
Jun 28, 5:46 PM CDTSevere Thunderstorm WarningDLHCarlton, Pine29 min
Jun 28, 6:10 PM CDTSevere Thunderstorm WarningDLHAitkin, Pine50 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

International Fa, MN (KINL), launched 12:00Z, 6.6 hours before the alert went out and 211 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-pSkew-T log-p diagram, International Fa, MN at 12:00Z on 2018-06-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, International Fa, MN at 12:00Z on 2018-06-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 77 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2670 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
77 m²/s²
0-3 km storm-relative helicity
204 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 28, 11:16 AM CDTMesoscale DiscussionSPCAitkin, Becker, Benton, Big Stone, Carlton, Cass and 20 more89 min
Jun 28, 3:53 PM CDTMesoscale DiscussionSPCAitkin, Becker, Beltrami, Carlton, Cass, Clay and 17 more97 min
Jun 28, 5:23 PM CDTMesoscale DiscussionSPCAitkin, Becker, Carlton, Cass, Clay, Clearwater and 7 more97 min
Jun 28, 3:52 AM CDTMesoscale DiscussionSPCBarnes, Burleigh, Cass, Dickey, Emmons, Foster and 12 more83 min
Jun 28, 7:40 AM CDTMesoscale DiscussionSPCAdams, Barnes, Burleigh, Cass, Dickey, Emmons and 18 more3 hr
Jun 28, 1:06 PM CDTMesoscale DiscussionSPCBenson, Burleigh, Eddy, Foster, Grand Forks, Griggs and 8 more114 min
Jun 28, 3:16 PM CDTTornado WatchSPCAdams, Barnes, Benson, Billings, Bowman, Burleigh and 31 more8 hr
Jun 28, 3:35 PM CDTMesoscale DiscussionSPCBillings, Bowman, Golden Valley, McKenzie, Slope2 hr
Jun 28, 6:59 PM CDTMesoscale DiscussionSPCAdams, Benson, Billings, Bowman, Burleigh, Dunn and 22 more91 min

Nearby

Severe Thunderstorm Watches in Minnesota, 2018Severe Thunderstorm Watches in Wisconsin, 2018Severe Thunderstorm Watches in North Dakota, 2018Every severe thunderstorm watch in 2018

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.