Alert archive / Minnesota / Mesoscale Discussions in 2018

Mesoscale Discussion 937

June 29, 20184 states

The Storm Prediction Center issued this mesoscale discussion at Jun 29, 2018, 4:14 AM CDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Jun 29, 2018, 4:14 AM CDT (09:14 UTC)
Expired
Jun 29, 2018, 6:15 AM CDT
In force
2 hr
Issued by
the Storm Prediction Center
All 56 counties

Gogebic County, MI, Ontonagon County, MI, Aitkin County, MN, Becker County, MN, Beltrami County, MN, Benton County, MN, Carlton County, MN, Cass County, MN, Clay County, MN, Clearwater County, MN, Cook County, MN, Crow Wing County, MN, Douglas County, MN, Grant County, MN, Hubbard County, MN, Itasca County, MN, Kanabec County, MN, Kittson County, MN, Koochiching County, MN, Lake County, MN, Lake of the Woods County, MN, Mahnomen County, MN, Marshall County, MN, Mille Lacs County, MN, Morrison County, MN, Norman County, MN, Otter Tail County, MN, Pennington County, MN, Pine County, MN, Polk County, MN, Red Lake County, MN, Roseau County, MN, Saint Louis County, MN, Todd County, MN, Wadena County, MN, Wilkin County, MN, Cass County, ND, Cavalier County, ND, Grand Forks County, ND, Pembina County, ND, Ramsey County, ND, Ransom County, ND, Richland County, ND, Sargent County, ND, Traill County, ND, Walsh County, ND, Ashland County, WI, Bayfield County, WI, Burnett County, WI, Douglas County, WI, Iron County, WI, Price County, WI, Rusk County, WI, Sawyer County, WI, Vilas County, WI, Washburn County, WI

The radar

The Duluth radar (KDLH), 177 km from the middle of the area, began a volume at 09:15 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.

The watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

International Fa, MN (KINL), launched 00:00Z, 9.2 hours before the alert went out and 156 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 00:00Z on 2018-06-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 968 joules per kilogram.LCLLFCEL10008507005003002001001 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 00:00Z on 2018-06-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -1 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
968 J/kg
Mixed-layer CIN
-39 J/kg
Mixed-layer LCL
1276 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
-1 m²/s²
0-3 km storm-relative helicity
60 m²/s²
Significant tornado parameter
-0.0
Supercell composite
-0.5

Open this sounding in Storm Lab

The text

As transmitted.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 29, 9:45 AM CDTSevere Thunderstorm WatchSPCBaraga, Houghton, Keweenaw, Marquette, Ontonagon3 hr
Jun 29, 11:22 AM CDTMesoscale DiscussionSPCAlger, Baraga, Charlevoix, Delta, Dickinson, Emmet and 7 more113 min
Jun 28, 10:21 PM CDTMesoscale DiscussionSPCBecker, Clay, Clearwater, Mahnomen, Marshall, Norman and 4 more84 min
Jun 28, 10:54 PM CDTSevere Thunderstorm WatchSPCBecker, Beltrami, Clay, Clearwater, Hubbard, Kittson and 11 more9 hr
Jun 29, 2:02 AM CDTMesoscale DiscussionSPCAitkin, Becker, Beltrami, Carlton, Cass, Clay and 26 more118 min
Jun 29, 4:41 AM CDTSevere Thunderstorm WatchSPCAitkin, Carlton, Cass, Cook, Crow Wing, Douglas and 9 more5 hr
Jun 29, 6:41 AM CDTMesoscale DiscussionSPCAitkin, Carlton, Cass, Cook, Crow Wing, Itasca and 7 more2 hr
Jun 28, 9:06 PM CDTMesoscale DiscussionSPCAdams, Barnes, Benson, Billings, Bowman, Burleigh and 33 more84 min
Jun 29, 5:57 PM CDTMesoscale DiscussionSPCEmmons, Sioux63 min

Nearby

Mesoscale Discussions in Minnesota, 2018Mesoscale Discussions in North Dakota, 2018Mesoscale Discussions in Wisconsin, 2018Every mesoscale discussion 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.