Alert archive / Nebraska / Areal Flood Warnings in 2018

Areal Flood Warning 2, NWS Cheyenne, WY

May 19, 2018Goshen County, Laramie County, Wyoming; 6 counties in Nebraska

NWS Cheyenne, WY issued this areal flood warning at May 19, 2018, 3:18 PM MDT for Goshen County, Laramie County, Wyoming; 6 counties in Nebraska. It was in force for 6 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, 2018, 3:18 PM MDT (21:18 UTC)
Expired: May 19, 2018, 9:15 PM MDT
In force: 6 hr
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Flood severity: None

Counties Banner County, NE, Box Butte County, NE, Dawes County, NE, Kimball County, NE, Scotts Bluff County, NE, Sioux County, NE, Goshen County, WY, Laramie County, WY

The radar

The Cheyenne radar (KCYS), 122 km from the middle of the area, began a volume at 21:19 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 (KDEN), launched 12:00Z, 9.3 hours before the alert went out and 233 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: 784 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: -58 m²/s²
0-3 km storm-relative helicity: -46 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, 3:00 PM MDT, 18 minutes earlier.

Area forecast discussion, May 19, 3:00 PM MDT, 18 minutes before

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Hazardous weather outlook, May 19, 6:17 AM MDT, 9 hours 1 minute before

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In the hours before

Local storm report, May 19, 9:28 AM MDT, 5 hours 50 minutes before

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Local storm report, May 19, 2:13 PM MDT, 1 hour 5 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 18, 6:01 PM MDT	Areal Flood Advisory	CYS	Goshen, Niobrara	6 hr
May 18, 6:18 PM MDT	Special Weather Statement	CYS	Goshen	57 min
May 18, 7:20 PM MDT	Special Weather Statement	CYS	Platte	55 min
May 18, 11:58 PM MDT	Flash Flood Warning	CYS	Goshen	6 hr
May 19, 8:01 AM MDT	Flash Flood Warning	CYS	Laramie	3 hr
May 19, 10:01 AM MDT	Areal Flood Warning	CYS	Goshen, Laramie, Niobrara, Platte	6 hr
May 18, 6:12 PM MDT	Special Weather Statement	CYS	Sioux	63 min
May 18, 10:00 PM MDT	Special Weather Statement	CYS	Dawes	45 min
May 18, 10:50 PM MDT	Flash Flood Warning	CYS	Dawes, Sioux	3 hr
May 18, 11:26 PM MDT	Areal Flood Advisory	CYS	Scotts Bluff	4 hr
May 19, 12:38 AM MDT	Flash Flood Warning	CYS	Banner, Kimball, Scotts Bluff	7 hr
May 19, 7:43 AM MDT	Areal Flood Advisory	CYS	Banner, Kimball, Scotts Bluff	5 hr
May 19, 11:34 AM MDT	Areal Flood Advisory	CYS	Box Butte, Cheyenne, Dawes, Morrill	4 hr
May 19, 3:29 PM MDT	Areal Flood Advisory	CYS	Box Butte, Cheyenne, Dawes, Morrill	6 hr

Nearby

Areal Flood Warnings in Nebraska, 2018 Areal Flood Warnings in Wyoming, 2018 Every areal flood warning in 2018

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.