Alert archive / Nebraska / Flood Watches in 2023

Flood Watch 2, NWS Cheyenne, WY

May 10, 20236 counties in Wyoming; 8 counties in Nebraska

NWS Cheyenne, WY issued this flood watch at May 10, 2023, 11:47 AM MDT for 6 counties in Wyoming; 8 counties in Nebraska. It took effect at May 10, 2023, 3:00 PM MDT. It was in force for 45 hr.

The area

The counties it named.

The facts

Issued: May 10, 2023, 11:47 AM MDT (17:47 UTC)
In effect from: May 10, 2023, 3:00 PM MDT
Expired: May 12, 2023, 12:00 PM MDT
In force: 45 hr
Issued by: NWS Cheyenne, WY
Flood severity: None

Counties Banner County, NE, Box Butte County, NE, Cheyenne County, NE, Dawes County, NE, Kimball County, NE, Morrill County, NE, Scotts Bluff County, NE, Sioux County, NE, Albany County, WY, Converse County, WY, Goshen County, WY, Laramie County, WY, Niobrara County, WY, Platte County, WY

The radar

The Cheyenne radar (KCYS), 114 km from the middle of the area, began a volume at 17:52 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

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 5.8 hours before the alert went out and 304 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: 698 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 57 m²/s²
0-3 km storm-relative helicity: 298 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.6

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flood watch 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 flood watch went out at May 10, 11:46 AM MDT, 1 minute earlier.

Area forecast discussion, May 10, 11:46 AM MDT, 1 minute before

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Hazardous weather outlook, May 10, 6:31 AM MDT, 5 hours 16 minutes before

Hazardous Weather Outlook
National Weather Service Cheyenne WY
631 AM MDT Wed May 10 2023

NEZ002-003-019>021-054-055-095-096-WYZ101>119-111245-
Dawes County-Box Butte County-Scotts Bluff County-Banner County-
Morrill County-Kimball County-Cheyenne County-
Northern Sioux County-Southern Sioux County-
Converse County Lower Elevations-Niobrara County-
North Laramie Range-Ferris/Seminoe/Shirley Mountains-
Shirley Basin-Central Laramie Range and Southwest Platte County-
East Platte County-Goshen County-Central Carbon County-
North Snowy Range Foothills-Southwest Carbon County-
Sierra Madre Range-Upper North Platte River Basin-Snowy Range-
Laramie Valley-South Laramie Range-South Laramie Range Foothills-
Central Laramie County-East Laramie County-
631 AM MDT Wed May 10 2023

This hazardous weather outlook is for portions of panhandle
Nebraska...east central Wyoming...south central Wyoming and
southeast Wyoming.

.DAY ONE...TODAY AND TONIGHT

Severe thunderstorms are expected to develop this afternoon, first
in Wyoming and then during the evening hours in Nebraska. Large
hail over 1 inch, wind gusts over 60 mph, and a tornado or two
will be possible with any of the stronger storms. Frequent
lightning and heavy rain will also accompany storms. High rainfall
rates could lead to flash flooding in some storms.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

Heavy rain and more storms are expected on Thursday and Friday.
More potential for flooding will be possible on Thursday with
widespread precipitation.

.Spotter information statement...

Spotters are encouraged to report any wind, hail, flooding or
tornadoes to the National Weather Service.

In the hours before

Local storm report, May 10, 6:35 AM MDT, 5 hours 12 minutes before

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Local storm report, May 10, 9:47 AM MDT, 2 hours before

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Local storm report, May 10, 11:15 AM MDT, 32 minutes before

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Local storm report, May 10, 11:41 AM MDT, 6 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 9, 6:40 PM MDT	Special Weather Statement	CYS	Laramie	35 min
May 9, 7:02 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Laramie	28 min
May 9, 7:23 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Laramie	52 min
May 9, 7:26 PM MDT	Special Weather Statement	CYS	Laramie	34 min
May 9, 7:36 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Laramie	24 min
May 9, 7:59 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Laramie	46 min
May 9, 8:12 PM MDT	Special Weather Statement	CYS	Laramie	48 min
May 9, 8:32 PM MDT	Special Weather Statement	CYS	Laramie	28 min
May 9, 8:38 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	52 min
May 9, 8:43 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Laramie	32 min
May 9, 9:09 PM MDT	Special Weather Statement	CYS	Laramie	36 min
May 9, 9:15 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	45 min
May 10, 12:09 PM MDT	River Flood Warning	CYS	Carbon	55 hr
May 10, 1:38 PM MDT	Special Weather Statement	CYS	Carbon	52 min
May 10, 2:47 PM MDT	Special Weather Statement	CYS	Carbon	43 min
May 10, 3:22 PM MDT	Special Weather Statement	CYS		38 min
May 10, 3:27 PM MDT	Special Weather Statement	CYS	Carbon	48 min
May 10, 4:10 PM MDT	Special Weather Statement	CYS	Albany	50 min
May 9, 7:51 PM MDT	Tornado Warning	CYS	Banner, Kimball	24 min
May 9, 8:15 PM MDT	Tornado Warning	CYS	Banner, Kimball	11 min
May 9, 9:00 PM MDT	Tornado Warning	CYS	Banner	30 min
May 9, 9:25 PM MDT	Severe Thunderstorm Warning	CYS	Banner	38 min
May 9, 10:57 PM MDT	Severe Thunderstorm Warning	CYS	Scotts Bluff	48 min
May 9, 11:43 PM MDT	Severe Thunderstorm Warning	CYS	Scotts Bluff	25 min
May 9, 11:49 PM MDT	Flash Flood Warning	CYS	Banner, Scotts Bluff	3 hr
May 10, 1:19 AM MDT	Special Weather Statement	CYS	Cheyenne	26 min
May 10, 1:51 AM MDT	Severe Thunderstorm Warning	CYS	Cheyenne	39 min
May 10, 3:04 AM MDT	Special Weather Statement	CYS	Cheyenne, Kimball	41 min
May 10, 3:17 AM MDT	Severe Thunderstorm Warning Considerable damage threat	CYS	Cheyenne, Kimball	58 min

Nearby

Flood Watches in Nebraska, 2023 Flood Watches in Wyoming, 2023 Every flood watch in 2023

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.