Alert archive / Wyoming / Areal Flood Warnings in 2011

Areal Flood Warning 1, NWS Cheyenne, WY

May 18, 2011Carbon County, Wyoming

NWS Cheyenne, WY issued this areal flood warning at May 18, 2011, 2:06 PM MDT for Carbon County, Wyoming. It was in force for 20 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 18, 2011, 2:06 PM MDT (20:06 UTC)
Expired: May 19, 2011, 10:26 AM MDT
In force: 20 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 20:09 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

Denver, CO (KDNR), launched 12:00Z, 8.1 hours before the alert went out and 372 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: 19 J/kg
Mixed-layer CIN: -37 J/kg
Mixed-layer LCL: 625 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 3 m²/s²
0-3 km storm-relative helicity: 99 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 18, 11:57 AM MDT, 2 hours 9 minutes earlier.

Area forecast discussion, May 18, 11:57 AM MDT, 2 hours 9 minutes before

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Hazardous weather outlook, May 18, 3:59 AM MDT, 10 hours 7 minutes before

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    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
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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 18, 3:12 AM MDT	Flash Flood Watch	CYS	Albany, Laramie, Platte	24 hr
May 18, 4:04 PM MDT	Winter Weather Advisory	CYS	Albany, Carbon, Laramie	19 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.