Alert archive / Montana / Mesoscale Discussions in 2015

Mesoscale Discussion 907

June 5, 201515 counties in Montana

The Storm Prediction Center issued this mesoscale discussion at Jun 5, 2015, 8:42 PM MDT for 15 counties in Montana. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued
Jun 5, 2015, 8:42 PM MDT (02:42 UTC)
Expired
Jun 5, 2015, 10:15 PM MDT
In force
93 min
Issued by
the Storm Prediction Center

Counties Big Horn County, MT, Custer County, MT, Dawson County, MT, Garfield County, MT, McCone County, MT, Musselshell County, MT, Petroleum County, MT, Powder River County, MT, Prairie County, MT, Richland County, MT, Roosevelt County, MT, Rosebud County, MT, Treasure County, MT, Valley County, MT, Yellowstone County, MT

The radar

The Glasgow radar (KGGW), 159 km from the middle of the area, began a volume at 02:43 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 nearest sounding before it

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 2.7 hours before the alert went out and 161 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, Glasgow Intl Airport, MT at 00:00Z on 2015-06-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 972 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, Glasgow Intl Airport, MT at 00:00Z on 2015-06-06The 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
972 J/kg
Mixed-layer CIN
-20 J/kg
Mixed-layer LCL
1263 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
77 m²/s²
0-3 km storm-relative helicity
174 m²/s²
Significant tornado parameter
0.3
Supercell composite
3.6

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 5, 6:41 PM MDTMesoscale DiscussionSPCBig Horn, Blaine, Carbon, Carter, Custer, Daniels and 22 more2 hr

Nearby

Mesoscale Discussions in Montana, 2015Every mesoscale discussion in 2015

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.