Alert archive / Wyoming / Areal Flood Warnings in 2011

Areal Flood Warning 2, NWS Cheyenne, WY

May 19, 2011Carbon County, Wyoming

NWS Cheyenne, WY issued this areal flood warning at May 19, 2011, 10:32 AM MDT for Carbon County, Wyoming. It was in force for 23 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 19, 2011, 10:32 AM MDT (16:32 UTC)
Expired: May 20, 2011, 9:15 AM MDT
In force: 23 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 16:29 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, 4.5 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 522 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 59 m²/s²
0-3 km storm-relative helicity: 64 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 19, 6:25 AM MDT, 4 hours 7 minutes earlier.

Area forecast discussion, May 19, 6:25 AM MDT, 4 hours 7 minutes before

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Hazardous weather outlook, May 19, 9:02 AM MDT, 1 hour 30 minutes before

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In the hours before

Special weather statement, May 19, 5:51 AM MDT, 4 hours 41 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
551 AM MDT THU MAY 19 2011

WYZ116>118-191400-
SOUTH LARAMIE RANGE-SOUTH LARAMIE RANGE FOOTHILLS-
CENTRAL LARAMIE COUNTY-
INCLUDING THE CITIES OF...VEDAUWOO...BUFORD...PUMPKIN VINE...
HORSE CREEK...HARRIMAN...WHITAKER...CHEYENNE
551 AM MDT THU MAY 19 2011

...HAZARDOUS TRAVEL TONIGHT ACROSS THE SOUTHERN LARAMIE RANGE
AND FOOTHILLS...

WYDOT WEB CAMS SHOWED VISIBILITIES LESS THAN A HALF MILE IN
FOG AND SNOW AT 6 AM THIS MORNING. THESE CONDITIONS WILL CONTINUE
TTHROUGH 8 AM AND WILL MAKE TRAVEL HAZARDOUS ALONG INTERSTATES 80
AND 25 FROM CHEYENNE...ACROSS THE SUMMIT...TO JUST EAST OF
LARAMIE.

MOTORISTS PLANNING TRAVEL IN THESE AREAS SHOULD BE PREPARED FOR
VERY LOW VISIBILITIES AND SLICK ROAD SURFACES. SLOW DOWN AND
INCREASE FOLLOWING DISTANCES BETWEEN VEHICLES.

Special weather statement, May 19, 5:52 AM MDT, 4 hours 40 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
552 AM MDT THU MAY 19 2011

WYZ116>118-191400-
SOUTH LARAMIE RANGE-SOUTH LARAMIE RANGE FOOTHILLS-
CENTRAL LARAMIE COUNTY-
INCLUDING THE CITIES OF...VEDAUWOO...BUFORD...PUMPKIN VINE...
HORSE CREEK...HARRIMAN...WHITAKER...CHEYENNE
552 AM MDT THU MAY 19 2011

...HAZARDOUS TRAVEL THIS MORNING ACROSS THE SOUTHERN LARAMIE
RANGE AND FOOTHILLS...

WYDOT WEB CAMS SHOWED VISIBILITIES LESS THAN A HALF MILE IN
FOG AND SNOW AT 6 AM THIS MORNING. THESE CONDITIONS WILL CONTINUE
THROUGH 8 AM AND WILL MAKE TRAVEL HAZARDOUS ALONG INTERSTATES 80
AND 25 FROM CHEYENNE...ACROSS THE SUMMIT...TO JUST EAST OF
LARAMIE.

MOTORISTS PLANNING TRAVEL IN THESE AREAS SHOULD BE PREPARED FOR
VERY LOW VISIBILITIES AND SLICK ROAD SURFACES. SLOW DOWN AND
INCREASE FOLLOWING DISTANCES BETWEEN VEHICLES.

Local storm report, May 19, 6:46 AM MDT, 3 hours 46 minutes before

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Special weather statement, May 19, 8:26 AM MDT, 2 hours 6 minutes before

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Special weather statement, May 19, 10:19 AM MDT, 13 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
May 19, 6:14 AM MDT	Winter Storm Warning	CYS	Albany, Laramie	5 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.