Alert archive / Montana / Winter Storm Watches in 2007

Winter Storm Watch 5, NWS Missoula, MT

February 18, 20076 counties in Montana; Clearwater County, Idaho

NWS Missoula, MT issued this winter storm watch at Feb 18, 2007, 2:16 PM MST for 6 counties in Montana; Clearwater County, Idaho. It took effect at Feb 19, 2007, 5:00 PM MST. It was in force for 24 hr.

The area

The counties it named.

The facts

Issued: Feb 18, 2007, 2:16 PM MST (21:16 UTC)
In effect from: Feb 19, 2007, 5:00 PM MST
Expired: Feb 20, 2007, 5:00 PM MST
In force: 24 hr
Issued by: NWS Missoula, MT

Counties Clearwater County, ID, Flathead County, MT, Lake County, MT, Lincoln County, MT, Mineral County, MT, Missoula County, MT, Sanders County, MT

The radar

The Missoula radar (KMSX), 83 km from the middle of the area, began a volume at 21:16 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, 9.3 hours before the alert went out and 124 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: 856 m above ground
0-6 km bulk shear: 80 kt
0-1 km storm-relative helicity: -101 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

What forecasters said that day

The local office's own words before this winter storm watch 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 winter storm watch went out at Feb 18, 2:08 PM MST, 8 minutes earlier.

Area forecast discussion, Feb 18, 2:08 PM MST, 8 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 18, 9:34 AM MST	Freezing Rain Advisory	MSO	Missoula, Ravalli	2 hr

Nearby

Winter Storm Watches in Montana, 2007 Winter Storm Watches in Idaho, 2007 Every winter storm watch 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.