Discrete supercells formed in eastern Colorado and moved south across Yuma, Kit Carson, and Cheyenne counties. As the discrete cells moved south, more cells developed in far northeast Colorado and southwest Nebraska forming a cluster of supercell that mainly impacted Yuma County.
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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 GLD wrote it up.
Discrete supercells formed in eastern Colorado and moved south across Yuma, Kit Carson, and Cheyenne counties. As the discrete cells moved south, more cells developed in far northeast Colorado and southwest Nebraska forming a cluster of supercell that mainly impacted Yuma County. The cells during this event produced various sized hail up to hen egg in size across Yuma, Kit Carson, and Cheyenne counties.
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 Goodland, KS wrote its last area forecast discussion before the first event at Aug 16, 12:52 PM MST, 26 minutes earlier.
Area Forecast Discussion National Weather Service Goodland KS 152 PM MDT Sun Aug 16 2020 .UPDATE... Issued at 151 PM MDT Sun Aug 16 2020 Update the forecast sent. Severe Thunderstorm Watch sent out. && .SHORT TERM...(This evening through Monday night) Issued at 117 PM MDT Sun Aug 16 2020 Across the Tri State region this afternoon, skies are mostly sunny to sunny with temperatures currently ranging from the upper 80s to lower 90s as of 100 pm MDT. Much of the CWA is seeing a SSE surface wind around 10-15 mph. Locales in NE Colorado are seeing a mix of variable winds as they are in a close proximity to surface trough/front over central Colorado. For the rest of the afternoon into this evening, the region awaits convection to develop over western portions of the CWA, traveling E/SE during the evening hours before exiting. Lots of instability ahead of the trough/front with SPC analysis showing 5000-6000 J/KG of SBcape, Dcape 1500-1800, decent shear with the SSE flow working west and upper flow from the WNW. Convection is already starting to crop up west of the CWA so do expect it to increase as the afternoon progresses. SPC has the region under a Slight Risk from an upgrade of Marginal this morning. Hatched areas for wind, hail and even some tornadoes have been expanded for the CWA. Localized flooding also possible. The areas could be looking at threats of at least( 1-2" for hail, 60- 70 mph on winds with isolated tornadoes) By the 06z Monday timeframe, region expected to be clear of precip, with high pressure building east and surface trough west. For temps, highs in the upper 80s for Monday with lows tonight in the upper 50s to lower 60s, and lower 60s for Monday night. .LONG TERM...(Tuesday through Sunday) Issued at 151 PM MDT Sun Aug 16 2020 As mentioned in previous discussions, a strong upper level ridge extending from the Desert Southwest into western Canada will continue to impact the Tri-State area through the long term period. Current guidance shows the upper level ridge slowly moving east towards the Four Corners region near the end of the week. As the area of high pressure moves east, the amplitude of the ridge will slightly dampen as a trough associated with a low over Quebec digs into the Gulf of Mexico. With the position of the ridge during the extended period, the Tri-State area will experience weak north to northwest flow aloft. Throughout the extended period, shortwaves will move across the Central High Plains region each day. Due to the upper level pattern, any storm development will depend on conditions near the surface. High temperatures will be in the 90s each day over the extended period. Tuesday a weak frontal boundary will move east across the area decreasing humidity values to the upper teens in our eastern Colorado counties. While the western portions of the area dry out, our eastern counties have a higher chance of seeing showers and thunderstorms in the evening. Wednesday will be similar to Tuesday with a lower chance of showers and thunderstorms. Guidance has convection initializing off the Colorado Front Range in the afternoon and dissipating in the early evening before reaching the Goodland CWA. Thursday and Friday bring more chances of rain to the area. Thursday, a front is expected to slowly move across the region bringing a widespread chance of thunderstorms in the late afternoon and evening. Friday morning, the front will continue to pass through bringing chances of precipitation to our eastern counties that should end before noon. The weekend looks to be fairly similar to the rest of the week with chances for thunderstorms in the late afternoon and evening mainly along and west of Hwy 27. && .AVIATION...(For the 18Z TAFS through 18Z Monday afternoon) Issued at 1122 AM MDT Sun Aug 16 2020 VFR conditions are forecast for both terminals. Looking for some VCTS from about 22z-02z as a cold front moves through the area. No reductions in visibility or ceilings at this time due to timing issues of storm startup/movement. Winds for KGLD, SE 5-10kts thru 23z, then ESE around 5-10kts. By 05z Monday, becoming SW around 10kts, then shifting to the NE around 10kts by 14z. Winds for KMCK, light/variable thru 22z, the ENE 5-10kts. By 01z Monday, becoming light/variable again becoming NE around 10kts by 15z. && .GLD WATCHES/WARNINGS/ADVISORIES... KS...NONE. CO...NONE. NE...NONE. && UPDATE...JN/KMK SHORT TERM...JN LONG TERM...KMK AVIATION...JN
Hazardous Weather Outlook National Weather Service Goodland KS 154 PM MDT Sun Aug 16 2020 COZ090>092-KSZ001>004-013>016-027>029-041-042-NEZ079>081-172000- Yuma County-Kit Carson County-Cheyenne County-Cheyenne-Rawlins- Decatur-Norton-Sherman-Thomas-Sheridan-Graham-Wallace-Logan-Gove- Greeley-Wichita-Dundy-Hitchcock-Red Willow- 154 PM MDT Sun Aug 16 2020 /254 PM CDT Sun Aug 16 2020/ This hazardous weather outlook is for extreme southwest Nebraska... northwest Kansas and east central Colorado. .DAY ONE...THIS AFTERNOON AND TONIGHT... There is a Severe Thunderstorm Watch for the entire region until 10 PM MDT. There is a Marginal and Slight Risk of severe thunderstorms across the entire area this afternoon and evening as a cold front moves through the region. The worst potential conditions will be for areas along and east of Highway 385 in Colorado. Some storms may produce large hail, damaging winds and perhaps a brief tornado. Locally heavy rainfall is also possible. Storms will exit the area to the south by midnight. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SUNDAY... No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation may be required.
The Goodland radar (KGLD), 71 km away, was scanning. The volume nearest the first event began at 20:18 UTC.
13 hail. Local standard time, as filed.
Various sized hail was reported from quarter to ping pong ball in size fell for a duration of approximately 11 minutes.
Various sized hail reported ranging from nickel to hen egg in size for a duration of approximately 25 minutes in the town of Kirk. Several windows were broken and holes in siding of home from the hail found in town.
Dime to ping pong ball sized hail fell for approximately 11 minutes and completely covered the ground.
Multiple reports of various sized hail ranging from nickel to golf ball in size for an approximate duration of seven minutes.
Hail ranging from dime to penny in size reported at the location.
Trained spotter reported ongoing nickel sized hail.
Reports received of various sized hail from dime to penny in size.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Colorado in 2020Every state in 2020This day in weather historyWarnings in Colorado, August 2020
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 917182, 917183, 917184, 917185, 917186, 917187, 917188, 917190, 917808, 917192, 917193, 917194, 917809.