Isolated thunderstorms developed along the front range of the Rockies in eastern CO during the evening hours. The thunderstorms traveled southeast and produced a 62 mph wind gust.
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The episode as NWS GLD wrote it up.
Isolated thunderstorms developed along the front range of the Rockies in eastern CO during the evening hours. The thunderstorms traveled southeast and produced a 62 mph wind gust.
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 20, 4:17 PM MST, 2 hours 38 minutes earlier.
Area Forecast Discussion National Weather Service Goodland KS 517 PM MDT Thu Aug 20 2020 .SHORT TERM...(This evening through Friday) Issued at 145 PM MDT Thu Aug 20 2020 Next shortwave trough rounding the western ridge will arrive this evening accompanied by widely scattered showers and thunderstorms. Environment will be similar to yesterday, with a slight uptick in MLCAPE, while DCAPE and effective shear are more or less the same. Expecting wind to be the primary hazard with gusts up to 65 mph possible with stronger storms. Despite a gradual decline in coverage through the evening, isolated showers/storms may persist through the overnight before ending by 12z Saturday. Low temperatures will be in the 60s. Upper ridge nudges into the area on Friday with rising heights. A few of the CAMs suggest isolated thunderstorms developing at peak heating along a surface trough from northeast Colorado into central Nebraska, moving east and weakening Friday evening. Weak instability remains a limiting factor, but cannot rule out an isolated severe wind gust with any storm that develops. Temperatures will warm into the middle to upper 90s and lows Friday night in the 60s again. .LONG TERM...(Saturday through Wednesday) Issued at 131 PM MDT Thu Aug 20 2020 The long term period will see the continuation of the warm and dry pattern we have seen this past week. On Saturday the upper level high will be centered over Arizona with the ridge over majority of the western CONUS. The cut-off low is expected to slowly move east towards the Tennessee Valley setting up northerly flow across the Central Great Plains. The ridge will continue to move east into next week centering over the High Plains region by Tuesday. As the high moves into the Four Corners region early next week, the ridge will extend into central Canada. Wednesday, a shortwave trough will move east along the northern extent of the ridge in Canada sending a cold front south. Looking at current guidance, it doesn't seem like the cold front will make it's way into the Tri-State area. High temperatures will be in the 90s each day. Low temperatures are expected to be in the 60s. Dry conditions are expected through the period. There is some concern for fire weather during the long term period. Relative humidity values are expected to drop down into middle to lower 20s each day in eastern Colorado. Sunday through Tuesday the concern is little higher as the low humidity levels will be co-located with southerly wind gusts approaching 25 mph. && .AVIATION...(For the 00Z TAFS through 00Z Friday evening) Issued at 514 PM MDT Thu Aug 20 2020 VFR conditions forecast for the 0z TAFs. Confidence of storms moving near a TAF site for the evening is low enough to not put in the TAFs. If one of the sites were to have storms move nearby, am thinking it would be KMCK during 3-4z. Otherwise winds will be on the light side through the period. && .GLD WATCHES/WARNINGS/ADVISORIES... KS...NONE. CO...NONE. NE...NONE. && SHORT TERM...024 LONG TERM...KMK AVIATION...JTL
Hazardous Weather Outlook National Weather Service Goodland KS 1034 AM MDT Thu Aug 20 2020 COZ090>092-KSZ001>004-013>016-027>029-041-042-NEZ079>081-211645- Yuma County-Kit Carson County-Cheyenne County-Cheyenne-Rawlins- Decatur-Norton-Sherman-Thomas-Sheridan-Graham-Wallace-Logan-Gove- Greeley-Wichita-Dundy-Hitchcock-Red Willow- 1034 AM MDT Thu Aug 20 2020 /1134 AM CDT Thu Aug 20 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 Marginal Risk for severe thunderstorms along and west of a line from McCook to Colby and Leoti in the 5 PM MDT (6 PM CDT) to 11 PM MDT (midnight CDT) timeframe. The primary hazard will be wind gusts to 60 mph. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH THURSDAY... No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation may be required.
Special Weather Statement
National Weather Service Goodland KS
724 PM MDT Thu Aug 20 2020
COZ092-210215-
Cheyenne County CO-
724 PM MDT Thu Aug 20 2020
...SIGNIFICANT WEATHER ADVISORY FOR WESTERN CHEYENNE COUNTY IN EAST
CENTRAL COLORADO UNTIL 815 PM MDT...
At 723 PM MDT, Doppler radar was tracking a strong thunderstorm 11
miles south of Boyero, or 36 miles south of Flagler, moving southeast
at 30 mph.
Pea size hail and winds in excess of 40 mph will be possible with
this storm.
Locations impacted include...
Kit Carson, Wild Horse and Aroya.
LAT...LON 3869 10316 3904 10316 3904 10311 3863 10259
3861 10261 3861 10313 3864 10317
TIME...MOT...LOC 0123Z 299DEG 25KT 3877 10319
LockhartThe Goodland radar (KGLD), 117 km away, was scanning. The volume nearest the first event began at 01:54 UTC.
1 thunderstorm wind. Local standard time, as filed.
Mesonet station UP729 reported a 62 mph thunderstorm wind gust at location.
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: 917336.