Alert archive / Wyoming / Mesoscale Discussions in 2011

Mesoscale Discussion 1375

June 24, 20114 states

The Storm Prediction Center issued this mesoscale discussion at Jun 24, 2011, 1:25 PM MDT for 4 states. It was in force for 65 min.

The area

The outline as issued.

The facts

Issued
Jun 24, 2011, 1:25 PM MDT (19:25 UTC)
Expired
Jun 24, 2011, 2:30 PM MDT
In force
65 min
Issued by
the Storm Prediction Center
All 24 counties

Big Horn County, MT, Powder River County, MT, Banner County, NE, Kimball County, NE, Scotts Bluff County, NE, Sioux County, NE, Custer County, SD, Fall River County, SD, Lawrence County, SD, Albany County, WY, Big Horn County, WY, Campbell County, WY, Converse County, WY, Crook County, WY, Goshen County, WY, Hot Springs County, WY, Johnson County, WY, Laramie County, WY, Natrona County, WY, Niobrara County, WY, Platte County, WY, Sheridan County, WY, Washakie County, WY, Weston County, WY

The watches that followed

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

The nearest sounding before it

Riverton, WY (KRIW), launched 12:00Z, 7.4 hours before the alert went out and 216 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, Riverton, WY at 12:00Z on 2011-06-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 16 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Riverton, WY at 12:00Z on 2011-06-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 26 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
16 J/kg
Mixed-layer CIN
-275 J/kg
Mixed-layer LCL
2318 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
26 m²/s²
0-3 km storm-relative helicity
143 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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.

IssuedProductOfficeCountiesLasted
Jun 24, 1:52 PM MDTSevere Thunderstorm WatchSPCBig Horn, Carter, Custer, Fallon, Powder River, Rosebud and 1 more7 hr
Jun 24, 4:57 PM MDTMesoscale DiscussionSPCArthur, Blaine, Boyd, Brown, Cherry, Custer and 16 more2 hr
Jun 24, 5:46 PM MDTSevere Thunderstorm WatchSPCArthur, Blaine, Brown, Cherry, Custer, Garden and 11 more6 hr

Nearby

Mesoscale Discussions in Wyoming, 2011Mesoscale Discussions in Nebraska, 2011Mesoscale Discussions in South Dakota, 2011Every mesoscale discussion 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.