Alert archive / Montana / Mesoscale Discussions in 2007

Mesoscale Discussion 770

May 10, 20075 counties in Montana; Big Horn County, Sheridan County, Wyoming

The Storm Prediction Center issued this mesoscale discussion at May 10, 2007, 3:59 PM MDT for 5 counties in Montana; Big Horn County, Sheridan County, Wyoming. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
May 10, 2007, 3:59 PM MDT (21:59 UTC)
Expired
May 10, 2007, 6:00 PM MDT
In force
2 hr
Issued by
the Storm Prediction Center

Counties Big Horn County, MT, Custer County, MT, Powder River County, MT, Rosebud County, MT, Treasure County, MT, Big Horn County, WY, Sheridan County, WY

The radar

The Billings radar (KBLX), 139 km from the middle of the area, began a volume at 21:59 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 12:00Z, 10.0 hours before the alert went out and 352 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 2007-05-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2007-05-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 89 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1438 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
89 m²/s²
0-3 km storm-relative helicity
95 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
May 10, 12:30 PM MDTMesoscale DiscussionSPCBeaverhead, Broadwater, Carbon, Deer Lodge, Fergus, Gallatin and 14 more3 hr
May 10, 2:16 PM MDTSevere Thunderstorm WatchSPCBeaverhead, Broadwater, Carbon, Deer Lodge, Fergus, Gallatin and 14 more7 hr
May 10, 4:59 PM MDTMesoscale DiscussionSPCBeaverhead, Broadwater, Carbon, Cascade, Chouteau, Deer Lodge and 21 more2 hr

Nearby

Mesoscale Discussions in Montana, 2007Mesoscale Discussions in Wyoming, 2007Every mesoscale discussion in 2007

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.