Alert archive / Wyoming / Winter Weather Advisories in 2012

Winter Weather Advisory 9, NWS Cheyenne, WY

February 29, 2012Albany County, Carbon County, Wyoming

NWS Cheyenne, WY issued this winter weather advisory at Feb 29, 2012, 2:14 PM MST for Albany County, Carbon County, Wyoming. It took effect at Feb 29, 2012, 11:00 PM MST. It was in force for 16 hr.

The area

The counties it named.

The facts

Issued: Feb 29, 2012, 2:14 PM MST (21:14 UTC)
In effect from: Feb 29, 2012, 11:00 PM MST
Expired: Mar 1, 2012, 3:11 PM MST
In force: 16 hr
Issued by: NWS Cheyenne, WY

Counties Albany County, WY, Carbon County, WY

The radar

The Cheyenne radar (KCYS), 140 km from the middle of the area, began a volume at 21:17 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

Grand Junction, CO (KGJT), launched 12:00Z, 9.2 hours before the alert went out and 337 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: 1354 m above ground
0-6 km bulk shear: 69 kt
0-1 km storm-relative helicity: 147 m²/s²
0-3 km storm-relative helicity: 247 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 weather advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Cheyenne, WY wrote its last area forecast discussion before this winter weather advisory went out at Feb 29, 1:19 PM MST, 55 minutes earlier.

Area forecast discussion, Feb 29, 1:19 PM MST, 55 minutes before

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Hazardous weather outlook, Feb 29, 1:16 PM MST, 58 minutes before

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In the hours before

Local storm report, Feb 29, 9:08 AM MST, 5 hours 6 minutes before

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Local storm report, Feb 29, 9:11 AM MST, 5 hours 3 minutes before

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Special weather statement, Feb 29, 9:28 AM MST, 4 hours 46 minutes before

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Local storm report, Feb 29, 9:47 AM MST, 4 hours 27 minutes before

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Local storm report, Feb 29, 10:29 AM MST, 3 hours 45 minutes before

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The office that day

Everything else NWS Cheyenne, WY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Feb 29, 1:04 PM MST	High Wind Warning	CYS	Albany, Laramie, Platte	2 hr

Nearby

Winter Weather Advisories in Wyoming, 2012 Every winter weather advisory in 2012

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.