Alert archive / Wyoming / Areal Flood Warnings in 2011

Areal Flood Warning 3, NWS Cheyenne, WY

May 23, 2011Carbon County, Wyoming

NWS Cheyenne, WY issued this areal flood warning at May 23, 2011, 6:57 AM MDT for Carbon County, Wyoming. It was in force for 53 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: May 23, 2011, 6:57 AM MDT (12:57 UTC)
Expired: May 25, 2011, 11:49 AM MDT
In force: 53 hr
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Flood severity: None

County Carbon County, WY

The radar

The Cheyenne radar (KCYS), 187 km from the middle of the area, began a volume at 13:00 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

Riverton, WY (KRIW), launched 12:00Z, 1.0 hours before the alert went out and 195 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: 854 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 53 m²/s²
0-3 km storm-relative helicity: 90 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 areal flood warning 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 areal flood warning went out at May 23, 4:30 AM MDT, 2 hours 27 minutes earlier.

Area forecast discussion, May 23, 4:30 AM MDT, 2 hours 27 minutes before

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Hazardous weather outlook, May 23, 5:13 AM MDT, 1 hour 44 minutes before

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    <section class="card" role="status" aria-live="polite">
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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 Cheyenne, WY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 23, 4:06 PM MDT	Areal Flood Advisory	CYS	Laramie	3 hr
May 23, 3:01 PM MDT	Flash Flood Watch	CYS	Banner, Box Butte, Cheyenne, Dawes, Kimball, Morrill and 2 more	38 hr

Nearby

Areal Flood Warnings in Wyoming, 2011 Every areal flood warning 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.