Alert archive / Montana / Freezing Rain Advisories in 2011

Freezing Rain Advisory 3, NWS Missoula, MT

February 4, 2011Missoula County, Ravalli County, Montana

NWS Missoula, MT issued this freezing rain advisory at Feb 4, 2011, 1:00 PM MST for Missoula County, Ravalli County, Montana. It was in force for 7 hr.

The area

The counties it named.

The facts

Issued: Feb 4, 2011, 1:00 PM MST (20:00 UTC)
Expired: Feb 4, 2011, 8:00 PM MST
In force: 7 hr
Issued by: NWS Missoula, MT

Counties Missoula County, MT, Ravalli County, MT

The radar

The Missoula radar (KMSX), 54 km from the middle of the area, began a volume at 20:04 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, 8.0 hours before the alert went out and 278 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1476 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 400 m²/s²
0-3 km storm-relative helicity: 442 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this freezing rain advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Missoula, MT wrote its last area forecast discussion before this freezing rain advisory went out at Feb 4, 10:20 AM MST, 2 hours 40 minutes earlier.

Area forecast discussion, Feb 4, 10:20 AM MST, 2 hours 40 minutes before

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Nearby

Freezing Rain Advisories in Montana, 2011 Every freezing rain advisory 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.