Alert archive / Montana / Snow Advisories in 2007

Snow Advisory 19, NWS Missoula, MT

March 27, 20074 counties in Montana; Clearwater County, Idaho County, Lemhi County, Idaho

NWS Missoula, MT issued this snow advisory at Mar 27, 2007, 2:47 AM MDT for 4 counties in Montana; Clearwater County, Idaho County, Lemhi County, Idaho. It took effect at Mar 27, 2007, 6:33 AM MDT. It was in force for 20 hr.

The area

The counties it named.

The facts

Issued: Mar 27, 2007, 2:47 AM MDT (08:47 UTC)
In effect from: Mar 27, 2007, 6:33 AM MDT
Expired: Mar 28, 2007, 2:10 AM MDT
In force: 20 hr
Issued by: NWS Missoula, MT

Counties Clearwater County, ID, Idaho County, ID, Lemhi County, ID, Granite County, MT, Lake County, MT, Missoula County, MT, Powell County, MT

The radar

The Missoula radar (KMSX), 64 km from the middle of the area, began a volume at 08:50 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

Boise Airport, ID (KBOI), launched 00:00Z, 8.8 hours before the alert went out and 360 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: 17 J/kg
Mixed-layer CIN: -115 J/kg
Mixed-layer LCL: 2555 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: 73 m²/s²
0-3 km storm-relative helicity: 205 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 snow 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 snow advisory went out at Mar 26, 9:06 PM MDT, 5 hours 41 minutes earlier.

Area forecast discussion, Mar 26, 9:06 PM MDT, 5 hours 41 minutes before

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Hazardous weather outlook, Mar 26, 4:17 AM MDT, 22 hours 30 minutes before

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        The site you requested is temporarily down for maintenance or an unexpected outage.
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The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 26, 9:07 PM MDT	Snow and Blowing Snow Advisory	MSO	Clearwater, Idaho	24 hr

Nearby

Snow Advisories in Montana, 2007 Snow Advisories in Idaho, 2007 Every snow advisory 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.