Alert archive / Montana / Mesoscale Discussions in 2014

Mesoscale Discussion 1039

June 17, 20144 states

The Storm Prediction Center issued this mesoscale discussion at Jun 17, 2014, 11:40 AM MDT for 4 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Jun 17, 2014, 11:40 AM MDT (17:40 UTC)
Expired: Jun 17, 2014, 1:45 PM MDT
In force: 2 hr
Issued by: the Storm Prediction Center
Chance of a watch: 80%

Counties Carter County, MT, Custer County, MT, Dawson County, MT, Fallon County, MT, Garfield County, MT, Powder River County, MT, Prairie County, MT, Wibaux County, MT, Bowman County, ND, Butte County, SD, Custer County, SD, Fall River County, SD, Harding County, SD, Lawrence County, SD, Pennington County, SD, Campbell County, WY, Crook County, WY, Weston County, WY

The radar

The Rapid City radar (KUDX), 181 km from the middle of the area, began a volume at 17:40 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.

The watches that followed

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

Tornado Watch 311Jun 17, 12:35 PM MDT

The nearest sounding before it

Rapid City, SD (KRAP), launched 12:00Z, 5.7 hours before the alert went out and 182 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: 2446 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 487 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 45 m²/s²
0-3 km storm-relative helicity: 183 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 2.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 16, 6:49 PM MDT	Mesoscale Discussion	SPC	Dawson, Richland	86 min
Jun 17, 5:04 AM MDT	Mesoscale Discussion	SPC	Garfield, Prairie	86 min
Jun 17, 12:31 PM MDT	Tornado Watch	SPC	Carter, Custer, Dawson, Fallon, Garfield, McCone and 3 more	7 hr
Jun 17, 2:22 PM MDT	Mesoscale Discussion	SPC	Carter, Custer, Dawson, Fallon, McCone, Prairie and 2 more	113 min
Jun 16, 6:47 PM MDT	Mesoscale Discussion	SPC	Bon Homme, Charles Mix, Davison, Douglas, Gregory, Hanson and 8 more	58 min
Jun 16, 7:37 PM MDT	Mesoscale Discussion	SPC	Bon Homme, Charles Mix, Davison, Douglas, Gregory, Hanson and 8 more	83 min
Jun 16, 8:56 PM MDT	Severe Thunderstorm Watch	SPC	Union	5 hr
Jun 16, 10:11 PM MDT	Mesoscale Discussion	SPC	Union	64 min
Jun 17, 3:53 PM MDT	Tornado Watch	SPC	Mellette, Todd, Tripp	6 hr
Jun 17, 4:12 PM MDT	Mesoscale Discussion	SPC	Bon Homme, Charles Mix, Clay, Davison, Douglas, Hanson and 7 more	2 hr
Jun 17, 5:02 PM MDT	Mesoscale Discussion	SPC	Bennett, Butte, Harding, Jackson, Meade, Oglala Lakota and 1 more	88 min
Jun 17, 5:48 PM MDT	Tornado Watch	SPC	Bon Homme, Clay, Hanson, Hutchinson, Lake, Lincoln and 7 more	6 hr

Nearby

Mesoscale Discussions in Montana, 2014 Mesoscale Discussions in South Dakota, 2014 Mesoscale Discussions in Wyoming, 2014 Every mesoscale discussion in 2014

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.