Alert archive / Montana / Mesoscale Discussions in 2011

Mesoscale Discussion 108

February 19, 20114 states

The Storm Prediction Center issued this mesoscale discussion at Feb 19, 2011, 4:58 PM MST for 4 states. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued
Feb 19, 2011, 4:58 PM MST (23:58 UTC)
Expired
Feb 19, 2011, 9:00 PM MST
In force
4 hr
Issued by
the Storm Prediction Center

Counties Big Horn County, MT, Carter County, MT, Fallon County, MT, Powder River County, MT, Adams County, ND, Bowman County, ND, Slope County, ND, Butte County, SD, Harding County, SD, Campbell County, WY, Crook County, WY, Johnson County, WY, Sheridan County, WY

The radar

The Rapid City radar (KUDX), 208 km from the middle of the area, began a volume at 00:07 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

Rapid City, SD (KUNR), launched 12:00Z, 12.0 hours before the alert went out and 211 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, Rapid City, SD at 12:00Z on 2011-02-19Temperature 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, Rapid City, SD at 12:00Z on 2011-02-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 81 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
646 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
81 m²/s²
0-3 km storm-relative helicity
190 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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Nearby

Mesoscale Discussions in Montana, 2011Mesoscale Discussions in Wyoming, 2011Mesoscale Discussions in North 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; radar from the NEXRAD Level II archive.