Alert archive / Montana / Mesoscale Discussions in 2013

Mesoscale Discussion 1340

July 7, 20134 counties in Idaho; 37 counties in Montana; 10 counties in Wyoming

The Storm Prediction Center issued this mesoscale discussion at Jul 7, 2013, 6:31 PM MDT for 4 counties in Idaho; 37 counties in Montana; 10 counties in Wyoming. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued
Jul 7, 2013, 6:31 PM MDT (00:31 UTC)
Expired
Jul 7, 2013, 8:30 PM MDT
In force
119 min
Issued by
the Storm Prediction Center
All 51 counties

Caribou County, ID, Fremont County, ID, Madison County, ID, Teton County, ID, Beaverhead County, MT, Big Horn County, MT, Blaine County, MT, Broadwater County, MT, Carbon County, MT, Carter County, MT, Cascade County, MT, Chouteau County, MT, Custer County, MT, Fallon County, MT, Fergus County, MT, Gallatin County, MT, Garfield County, MT, Golden Valley County, MT, Hill County, MT, Jefferson County, MT, Judith Basin County, MT, Lewis and Clark County, MT, Liberty County, MT, Madison County, MT, Meagher County, MT, Musselshell County, MT, Park County, MT, Petroleum County, MT, Phillips County, MT, Pondera County, MT, Powder River County, MT, Prairie County, MT, Rosebud County, MT, Silver Bow County, MT, Stillwater County, MT, Sweet Grass County, MT, Teton County, MT, Toole County, MT, Treasure County, MT, Wheatland County, MT, Yellowstone County, MT, Big Horn County, WY, Campbell County, WY, Crook County, WY, Hot Springs County, WY, Johnson County, WY, Park County, WY, Sheridan County, WY, Teton County, WY, Washakie County, WY, Weston County, WY

The radar

The Billings radar (KBLX), 36 km from the middle of the area, began a volume at 00:31 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

Great_falls, MT (KTFX), launched 00:00Z, 0.5 hours before the alert went out and 227 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 00:00Z on 2013-07-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 537 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 00:00Z on 2013-07-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 80 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
537 J/kg
Mixed-layer CIN
-81 J/kg
Mixed-layer LCL
1916 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
80 m²/s²
0-3 km storm-relative helicity
148 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.3

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
Jul 8, 9:21 AM MDTMesoscale DiscussionSPCBlaine, Cascade, Chouteau, Hill, Liberty, Phillips and 1 more84 min
Jul 8, 12:05 PM MDTMesoscale DiscussionSPCBroadwater, Cascade, Chouteau, Deer Lodge, Fergus, Golden Valley and 10 more85 min
Jul 8, 12:54 PM MDTMesoscale DiscussionSPCDaniels, McCone, Phillips, Richland, Roosevelt, Sheridan and 1 more66 min
Jul 8, 1:04 PM MDTSevere Thunderstorm WatchSPCBig Horn, Broadwater, Carbon, Fergus, Gallatin, Golden Valley and 10 more6 hr
Jul 8, 1:23 PM MDTSevere Thunderstorm WatchSPCDaniels, Dawson, Garfield, McCone, Petroleum, Phillips and 6 more8 hr
Jul 8, 1:56 PM MDTMesoscale DiscussionSPCFlathead, Glacier, Lake, Lewis and Clark, Lincoln, Mineral and 6 more94 min
Jul 8, 3:42 PM MDTMesoscale DiscussionSPCCarter, Custer, Fallon, Powder River, Rosebud, Treasure2 hr
Jul 8, 4:01 PM MDTSevere Thunderstorm WatchSPCCarter, Custer, Fallon, Powder River, Rosebud, Treasure8 hr
Jul 8, 4:58 PM MDTMesoscale DiscussionSPCBig Horn, Broadwater, Carbon, Carter, Custer, Daniels and 28 more2 hr
Jul 8, 1:51 PM MDTMesoscale DiscussionSPCGoshen, Niobrara, Weston54 min

Nearby

Mesoscale Discussions in Montana, 2013Mesoscale Discussions in Wyoming, 2013Mesoscale Discussions in Idaho, 2013Every mesoscale discussion in 2013

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.