Alert archive / Montana / Winter Storm Watches in 2013

Winter Storm Watch 2, NWS Missoula, MT

January 27, 2013Granite County, Missoula County, Ravalli County, Montana; Clearwater County, Idaho County, Idaho

NWS Missoula, MT issued this winter storm watch at Jan 27, 2013, 2:18 PM MST for Granite County, Missoula County, Ravalli County, Montana; Clearwater County, Idaho County, Idaho. It took effect at Jan 28, 2013, 5:00 PM MST. It was in force for .

The area

The counties it named.

The facts

Issued: Jan 27, 2013, 2:18 PM MST (21:18 UTC)
In effect from: Jan 28, 2013, 5:00 PM MST
Expired: Jan 28, 2013, 3:25 AM MST
In force
Issued by: NWS Missoula, MT

Counties Clearwater County, ID, Idaho County, ID, Granite County, MT, Missoula County, MT, Ravalli County, MT

The radar

The Missoula radar (KMSX), 81 km from the middle of the area, began a volume at 21:21 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 202 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: 583 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 24 m²/s²
0-3 km storm-relative helicity: 45 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 Jan 27, 3:54 AM MST, 10 hours 24 minutes earlier.

Area forecast discussion, Jan 27, 3:54 AM MST, 10 hours 24 minutes before

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In the hours before

Local storm report, Jan 27, 8:23 AM MST, 5 hours 55 minutes before

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Local storm report, Jan 27, 8:27 AM MST, 5 hours 51 minutes before

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Local storm report, Jan 27, 8:32 AM MST, 5 hours 46 minutes before

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Local storm report, Jan 27, 9:18 AM MST, 5 hours before

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Local storm report, Jan 27, 9:58 AM MST, 4 hours 20 minutes before

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Nearby

Winter Storm Watches in Montana, 2013 Winter Storm Watches in Idaho, 2013 Every winter storm watch in 2013

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.