Alert archive / Montana / Winter Weather Advisories in 2011

Winter Weather Advisory 9, NWS Missoula, MT

January 14, 2011Flathead County, Lake County, Montana

NWS Missoula, MT issued this winter weather advisory at Jan 14, 2011, 2:31 PM MST for Flathead County, Lake County, Montana. It took effect at Jan 14, 2011, 3:00 PM MST. It was in force for 12 hr.

The area

The counties it named.

The facts

Issued
Jan 14, 2011, 2:31 PM MST (21:31 UTC)
In effect from
Jan 14, 2011, 3:00 PM MST
Expired
Jan 15, 2011, 2:44 AM MST
In force
12 hr
Issued by
NWS Missoula, MT

Counties Flathead County, MT, Lake County, MT

The radar

The Missoula radar (KMSX), 104 km from the middle of the area, began a volume at 21:32 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

Spokane, WA (KOTX), launched 12:00Z, 9.5 hours before the alert went out and 177 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, Spokane, WA at 12:00Z on 2011-01-14Temperature 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, Spokane, WA at 12:00Z on 2011-01-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 222 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
966 m above ground
0-6 km bulk shear
74 kt
0-1 km storm-relative helicity
222 m²/s²
0-3 km storm-relative helicity
167 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

Everything else NWS Missoula, MT issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jan 13, 10:07 PM MSTFreezing Rain AdvisoryMSOFlathead, Granite, Lake, Lincoln, Mineral, Missoula and 3 more11 hr

Nearby

Winter Weather Advisories in Montana, 2011Every winter weather 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.