Alert archive / Montana / Mesoscale Discussions in 2014

Mesoscale Discussion 983

June 13, 2014Musselshell County, Prairie County, Treasure County, Montana

The Storm Prediction Center issued this mesoscale discussion at Jun 13, 2014, 1:10 PM MDT for Musselshell County, Prairie County, Treasure County, Montana. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Jun 13, 2014, 1:10 PM MDT (19:10 UTC)
Expired
Jun 13, 2014, 3:15 PM MDT
In force
2 hr
Issued by
the Storm Prediction Center
Chance of a watch
40%

Counties Musselshell County, MT, Prairie County, MT, Treasure County, MT

The radar

The Billings radar (KBLX), 94 km from the middle of the area, began a volume at 19:10 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

Great_falls, MT (KTFX), launched 12:00Z, 7.2 hours before the alert went out and 244 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, Great_falls, MT at 12:00Z on 2014-06-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 78 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, Great_falls, MT at 12:00Z on 2014-06-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -11 square meters per square second.1939587897117Sfc1 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
78 J/kg
Mixed-layer CIN
-118 J/kg
Mixed-layer LCL
574 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
-11 m²/s²
0-3 km storm-relative helicity
140 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 13, 2:17 AM MDTMesoscale DiscussionSPCBlaine, Cascade, Chouteau, Fergus, Judith Basin, Meagher and 1 more88 min
Jun 13, 1:46 PM MDTMesoscale DiscussionSPCCarter, Custer, Powder River89 min
Jun 13, 2:09 PM MDTSevere Thunderstorm WatchSPCBig Horn, Carter, Custer, Fallon, Musselshell, Powder River and 3 more9 hr

Nearby

Mesoscale Discussions in Montana, 2014Every 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.