Alert archive / Wyoming / Flash Flood Warnings in 2024

Flash Flood Warning 11, NWS Cheyenne, WY

July 17, 2024Albany County, Laramie County, Wyoming

NWS Cheyenne, WY issued this flash flood warning at Jul 17, 2024, 4:13 PM MDT for Albany County, Laramie County, Wyoming. It was in force for 3 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: Jul 17, 2024, 4:13 PM MDT (22:13 UTC)
Expired: Jul 17, 2024, 7:15 PM MDT
In force: 3 hr
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Flood severity: None

Counties Albany County, WY, Laramie County, WY

The radar

The Cheyenne radar (KCYS), 50 km from the middle of the area, began a volume at 22:15 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

Rapid City, SD (KUNR), launched 12:00Z, 10.2 hours before the alert went out and 345 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: 716 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 1023 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: 156 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash 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 flash flood warning went out at Jul 17, 2:32 PM MDT, 1 hour 41 minutes earlier.

Area forecast discussion, Jul 17, 2:32 PM MDT, 1 hour 41 minutes before

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Hazardous weather outlook, Jul 17, 8:25 AM MDT, 7 hours 48 minutes before

Hazardous Weather Outlook
National Weather Service Cheyenne WY
Issued by National Weather Service Riverton WY
825 AM MDT Wed Jul 17 2024

NEZ002-003-019>021-054-055-095-096-WYZ101>119-181430-
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-
825 AM MDT Wed Jul 17 2024

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

.DAY ONE...TODAY AND TONIGHT

Increasing moisture today will support strong to briefly severe
thunderstorms through this evening. Additionally, heavy rainfall
could lead to localized flash flooding.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

Severe potential late in the week, followed by cooler weather for
the weekend. Warm-up begins to start the week.

.Spotter information statement...

Spotters are encouraged to report severe weather to the National
Weather Service in Cheyenne.

In the hours before

Special weather statement, Jul 17, 2:49 PM MDT, 1 hour 24 minutes before

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Local storm report, Jul 17, 3:13 PM MDT, 1 hour before

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Special weather statement, Jul 17, 3:24 PM MDT, 49 minutes before

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Special weather statement, Jul 17, 3:45 PM MDT, 28 minutes before

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Special weather statement, Jul 17, 3:52 PM MDT, 21 minutes before

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Special weather statement, Jul 17, 4:07 PM 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
Jul 17, 12:01 PM MDT	Special Weather Statement	CYS	Niobrara	29 min
Jul 17, 12:05 PM MDT	Severe Thunderstorm Warning	CYS	Niobrara	13 min
Jul 17, 12:19 PM MDT	Special Weather Statement	CYS	Niobrara	26 min
Jul 17, 12:30 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Niobrara	30 min
Jul 17, 1:02 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	43 min
Jul 17, 1:05 PM MDT	Special Weather Statement	CYS	Laramie	25 min
Jul 17, 1:47 PM MDT	Special Weather Statement	CYS	Goshen	28 min
Jul 17, 2:20 PM MDT	Special Weather Statement	CYS	Goshen	25 min
Jul 17, 2:33 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	27 min
Jul 17, 2:39 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	36 min
Jul 17, 2:58 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	47 min
Jul 17, 3:45 PM MDT	Special Weather Statement	CYS	Niobrara	45 min
Jul 17, 3:52 PM MDT	Special Weather Statement	CYS	Laramie	38 min
Jul 17, 1:00 PM MDT	Special Weather Statement	CYS	Sioux	30 min
Jul 17, 1:09 PM MDT	Severe Thunderstorm Warning	CYS	Banner, Cheyenne, Kimball	17 min
Jul 17, 1:14 PM MDT	Severe Thunderstorm Warning	CYS	Sioux	31 min
Jul 17, 1:49 PM MDT	Special Weather Statement	CYS	Sioux	26 min
Jul 17, 2:10 PM MDT	Severe Thunderstorm Warning	CYS	Scotts Bluff, Sioux	18 min
Jul 17, 2:26 PM MDT	Special Weather Statement	CYS	Banner	34 min
Jul 17, 2:49 PM MDT	Special Weather Statement	CYS	Morrill	41 min
Jul 17, 3:24 PM MDT	Special Weather Statement	CYS	Dawes	36 min
Jul 17, 4:02 PM MDT	Severe Thunderstorm Warning	CYS	Dawes	28 min
Jul 17, 4:07 PM MDT	Special Weather Statement	CYS	Kimball	38 min
Jul 17, 4:31 PM MDT	Special Weather Statement	CYS	Cheyenne	44 min
Jul 17, 5:01 PM MDT	Severe Thunderstorm Warning Considerable damage threat	CYS	Cheyenne	29 min
Jul 17, 5:30 PM MDT	Special Weather Statement	CYS	Cheyenne	45 min

Nearby

Flash Flood Warnings in Wyoming, 2024 Every flash flood warning in 2024

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.