A short-lived thunderstorm developed southeast of Rock River in the Laramie Valley in the evening on the 13th that briefly produced a tornado over open land with no known damage.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS CYS wrote it up.
A short-lived thunderstorm developed southeast of Rock River in the Laramie Valley in the evening on the 13th that briefly produced a tornado over open land with no known damage.
The local office's own words before the first event, 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 the first event at Jun 13, 5:14 PM MST, 30 minutes earlier.
Area Forecast Discussion National Weather Service Cheyenne WY 614 PM MDT Tue Jun 13 2023 .SHORT TERM...(This evening through Thursday night) Issued at 245 PM MDT Tue Jun 13 2023 Forecast challenges deal with location of showers and storms through the short term. Surface analysis showing a surface high pressure across north central Colorado this afternoon with surface boundary form northeast Colorado to maybe near Cheyenne west to maybe Steamboat Colorado. Easterly winds east and north of this boundary across most of our northeastern CWA. Convection mainly confined to the Laramie Range and points west. Though Cheyenne just had a brief shower move through the past couple minutes. HRRR and RAP simulated radar for this afternoon keeps most convection west this afternoon. A brief respite in the rain expected Wednesday as a transitory upper ridge axis moves through the CWA. Showers will once again be limited to the mountains and points west of the Laramie Range. Next shortwave approaches the area from the west Wednesday night into Thursday. Timing of this shortwave is during the afternoon so look for showers and storms to be widespread across the entire CWA once again. PWATS are back up near .8 inches across southeast Wyoming and over 1 inch in the Panhandle Thursday afternoon. Tall/skinny CAPES again for southeast Wyoming sites indicating heavy rainfall. Maybe better chances for severe storms in the Panhandle. WPC has a Marginal Risk area for excessive rainfall highlighted for the entire CWA Thursday. This upper trough remains over the CWA Thursday night into Friday...so showers and storms could linger into the overnight hours into Friday morning. Given recent rainfall...may need another Flash Flood Watch for Thursday for some areas. .LONG TERM...(Friday through Monday) Issued at 335 AM MDT Tue Jun 13 2023 Friday...The next shortwave trough aloft moves across Wyoming and will combine with plenty of low and mid level moisture to help generate scattered to numerous showers and scattered thunderstorms in the afternoon and evening. Due to the increase in cloud cover and precipitation coverage, temperatures will be somewhat cooler compared to Thursday. Saturday...As the flow aloft turns northwest with a low amplitude shortwave ridge over Wyoming the atmosphere will dry out even more with only isolated afternoon thunderstorms possible mainly south of a Rawlins to Scottsbluff line. along with warmer temperatures due to 700 mb temperatures near 9 degrees Celsius and less cloud cover than Friday. Sunday...Maximum temperatures will warm even more for Father's Day as the ridge axis aloft moves over the western High Plains states and southwest flow develops over our forecast area, establishing a decent surface lee trough with 700 mb temperatures near 14 degrees Celsius. It appears there will be enough low and mid level moisture combining with surface heating to produce isolated afternoon and evening showers and thunderstorms. Monday...Southwest flow aloft strengthens helping to further establish the surface lee side trough axis and producing more warm maximum temperatures with 700 mb temperatures near 15 degrees Celsius. Strong daytime heating will combine with enough low and mid level moisture to generate isolated late day showers and thunderstorms, most common along and west of Interstate 25. && .AVIATION...(For the 00Z TAFS through 00Z Wednesday evening) Issued at 555 PM MDT Tue Jun 13 2023 VFR conditions expected across area terminals through the forecast period. Showers and thunderstorms will continue in the vicinity of southeast WY terminals early this evening before dissipating. SCT-BKN cumulus will also decrease in coverage over the next few hours across the NE Panhandle giving way to SKC. Southeast WY terminals will begin to see southwest winds increase Wednesday morning around 15-20 kt with scattered showers and thunderstorms developing in the afternoon. Coverage will be less like today was compared to earlier in the week and this past weekend, but kept VCTS in the TAFs for southeast WY terminals in the afternoon. && .FIRE WEATHER... Issued at 245 PM MDT Tue Jun 13 2023 Minimal fire weather concerns with recent moderate to heavy rains across most of southeast Wyoming and Nebraska Panhandle. There will be daily chances for showers and storms at least through the weekend before we begin to see possibly a drier pattern taking shape. Look for widespread wetting rains both Thursday and Friday with heavy rain possible. && .CYS WATCHES/WARNINGS/ADVISORIES... WY...None. NE...None. && SHORT TERM...GCC LONG TERM...SAR AVIATION...MB FIRE WEATHER...GCC
Hazardous Weather Outlook National Weather Service Cheyenne WY 308 PM MDT Tue Jun 13 2023 WYZ101>119-142115- 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- 308 PM MDT Tue Jun 13 2023 This hazardous weather outlook is for portions of east central Wyoming...south central Wyoming and southeast Wyoming. .DAY ONE...THIS AFTERNOON AND TONIGHT Scattered showers and thunderstorms will develop this afternoon, then diminish this evening. The stronger storms will be capable of producing small hail, gusty winds to 40 mph and locally heavy rain. There is an elevated risk for burn scar flooding and debris flows this afternoon. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY Scattered to numerous afternoon and evening showers and thunderstorms are forecast Wednesday through Friday, becoming more isolated this weekend. Flash flooding risks will increase for Thursday and Friday across southeast Wyoming...as well as the Mullen Burn Scar. Severe weather is not expected at this time. .Spotter information statement... Spotter activation will not be needed. NEZ002-003-019>021-054-055-095-096-142115- Dawes County-Box Butte County-Scotts Bluff County-Banner County- Morrill County-Kimball County-Cheyenne County- Northern Sioux County-Southern Sioux County- 308 PM MDT Tue Jun 13 2023 This hazardous weather outlook is for portions of panhandle Nebraska. .DAY ONE...THIS AFTERNOON AND TONIGHT Widely scattered showers and thunderstorms will develop this afternoon, then diminish this evening. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY Isolated to scattered afternoon and evening showers and thunderstorms are forecast Wednesday through Friday, with isolated coverage this weekend. There is a marginal risk for severe thunderstorms producing large hail and strong winds over the southern Panhandle Thursday afternoon. .Spotter information statement... Spotter activation will not be needed.
The Cheyenne radar (KCYS), 103 km away, was scanning. The volume nearest the first event began at 00:44 UTC.
1 tornado. Local standard time, as filed.
Received reports of 2 to 3 brief touchdowns southeast of Rock River.
After NWS Directive 10-1605, the rules offices file Storm Data by.
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