During the early afternoon a line of thunderstorms slowly moved northeast across East Central Colorado. Hail up to golf ball size fell at Flagler, with the hail reaching a depth of several inches.
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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.
During the early afternoon a line of thunderstorms slowly moved northeast across East Central Colorado. Hail up to golf ball size fell at Flagler, with the hail reaching a depth of several inches. The hail was several inches all the way to Siebert as well. The hail was deep enough to reduce interstate traffic to a crawl. As the storms exited Flagler a damaging wind gust occurred which blew down many electrical poles a mile or so northwest of town. This resulted in no power for several hours for parts of Flagler.
During the early evening a second round of thunderstorms moved in from the west-northwest. As these thunderstorms moved in a wind gust of 70 MPH occurred, blowing a semi on its on I-70.
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 Apr 21, 12:55 PM MST, 1 hour 27 minutes earlier.
Area Forecast Discussion National Weather Service Goodland KS 155 PM MDT Sun Apr 21 2019 .SHORT TERM...(This evening through Monday) Issued at 145 PM MDT Sun Apr 21 2019 Scattered to numerous thunderstorms will move out of northeast Colorado and across northwest Kansas/southwest Nebraska this evening as shortwave trough ejects across the area, exiting to the north by around 07z. Severe threat will be limited to about 04z, then wane as boundary layer cools. Primary hazard will be wind gusts of up to 60 mph with favorable DCAPE environment/relatively high bases, followed by a marginal threat of hail up to quarter sized, and finally a low end risk for locally heavy rainfall. Clouds will persist through the night with breezy north winds. Lows will range from the upper 30s in Colorado to the lower 50s in north central Kansas. Clouds will persist into Monday with perhaps some partial clearing late in northern areas. As a result, temperatures will be much cooler, with highs in the upper 50s to lower 60s. North winds will be gusty and strongest in the morning, then slowly diminish in the afternoon. .LONG TERM...(Tuesday through Sunday) Issued at 139 PM MDT Sun Apr 21 2019 While near term models show a decent amount of disagreement with how southern plains H5 trough evolves, consensus still appears that system will track well to the south of the area with only slim chances of light precipitation glancing the southern CWA. After system departs, medium range models in reasonable agreement that ridging will build over the area through the weekend. Differences emerge with the amplification and strength of the ridge, with the GFS being a bit more amplified than other available guidance. Regardless of preferred solution, seems like weather will be fairly quiet from Tuesday through Thursday as temperatures slowly warm, but surface flow does not look really favorable for any meaningful moisture return until Thursday Night and Friday as sfc high shifts east and strong southerly flow develops again. Should we get enough moisture/instability development shear profile with fast zonal flow would support some organized/severe storms, but details at this point remain very unclear. Main forecast changes to available guidance were to nudge temperatures to warmer end of distribution/ensemble data, although potential for mountain cirrus limiting insolation a bit concerning. && .AVIATION...(For the 18Z TAFS through 18Z Monday afternoon) Issued at 1121 AM MDT Sun Apr 21 2019 Main aviation concern will be thunderstorm chances this afternoon and tonight at both KGLD and KMCK. Expecting a line of storms to develop south of KGLD by mid afternoon which will progress northward during the late afternoon and evening hours. Gusty winds and small hail may accompany the storms at KGLD, but with later arrival time at KMCK do not expect storms to be as strong. Thunderstorm threat will end by 04z at KGLD and 07z at KMCK. During the overnight, models show MVFR ceilings moving into the area from the north and persisting through Monday morning. && .GLD WATCHES/WARNINGS/ADVISORIES... KS...NONE. CO...NONE. NE...NONE. && SHORT TERM...024 LONG TERM...JRM AVIATION...024
Hazardous Weather Outlook National Weather Service Goodland KS 330 AM MDT Sun Apr 21 2019 COZ090>092-KSZ001>004-013>016-027>029-041-042-NEZ079>081-221200- Yuma County-Kit Carson County-Cheyenne County-Cheyenne-Rawlins- Decatur-Norton-Sherman-Thomas-Sheridan-Graham-Wallace-Logan-Gove- Greeley-Wichita-Dundy-Hitchcock-Red Willow- 330 AM MDT Sun Apr 21 2019 /430 AM CDT Sun Apr 21 2019/ This hazardous weather outlook is for extreme southwest Nebraska... northwest Kansas and east central Colorado. .DAY ONE...TODAY AND TONIGHT... Strong to severe thunderstorms are expected mainly along and north of highway 40 in the 3 PM MDT (4 PM CDT) to 11 PM MDT (midnight CDT) timeframe. Wind gusts to 65 mph, large hail and locally heavy rainfall will be the primary threats. The strong outflow winds will produce some blowing dust and reduced visibilities in spots. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY... No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation will be needed.
Special Weather Statement National Weather Service Goodland KS 236 PM MDT Sun Apr 21 2019 KSZ027-041-212115- Wallace KS-Greeley KS- 236 PM MDT Sun Apr 21 2019 ...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN WALLACE AND NORTHERN GREELEY COUNTIES UNTIL 315 PM MDT... At 235 PM MDT, Doppler radar was tracking a strong thunderstorm 7 miles south of Weskan, or 16 miles southwest of Sharon Springs, moving east at 25 mph. Pea to dime sized hail and wind gusts up to 55 mph will be possible with this storm. This storm will remain over mainly rural areas of southwestern Wallace and northern Greeley Counties. LAT...LON 3864 10204 3884 10204 3890 10165 3861 10164 TIME...MOT...LOC 2035Z 267DEG 21KT 3875 10201 Vincent
Special Weather Statement
National Weather Service Goodland KS
254 PM MDT Sun Apr 21 2019
COZ091-212200-
Kit Carson County CO-
254 PM MDT Sun Apr 21 2019
...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN KIT CARSON COUNTY
UNTIL 400 PM MDT...
At 252 PM MDT, Doppler radar was tracking a strong thunderstorm 4
miles southwest of Seibert. This storm was nearly stationary.
Additional thunderstorms were located along Interstate 70 between
Seibert and Bethune.
Pea to dime sized hail and wind gusts up to 50 mph will be possible
with these storms. Torrential rainfall can also be expected.
Locations impacted include...
Stratton, Flagler, Seibert and Vona.
This includes Interstate 70 in Colorado between mile markers 391 and
426.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall is occurring in association with these storms,
and may lead to localized flooding. Do not drive your vehicle
through flooded roadways.
&&
LAT...LON 3917 10315 3940 10315 3941 10249 3910 10248
3910 10316
TIME...MOT...LOC 2052Z 178DEG 1KT 3924 10291
VincentSpecial Weather Statement National Weather Service Goodland KS 303 PM MDT Sun Apr 21 2019 KSZ027-028-041-042-212200- Wichita KS-Wallace KS-Greeley KS-Logan KS- 303 PM MDT Sun Apr 21 2019 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN WICHITA...SOUTHEASTERN WALLACE...WESTERN LOGAN AND NORTHEASTERN GREELEY COUNTIES UNTIL 400 PM MDT/500 PM CDT/... At 302 PM MDT/402 PM CDT/, Doppler radar was tracking strong thunderstorms along a line extending from Sharon Springs to 11 miles north of Horace. Movement was east at 20 mph. Pea to dime sized hail and wind gusts up to 55 mph will be possible with these storms. Locations impacted include... Leoti, Sharon Springs, Winona, Wallace, Marienthal and Selkirk. PRECAUTIONARY/PREPAREDNESS ACTIONS... Torrential rainfall is also occurring with these storms, and may lead to localized flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 3908 10122 3844 10120 3850 10186 3898 10187 TIME...MOT...LOC 2102Z 266DEG 16KT 3890 10176 3864 10175 Vincent
Special Weather Statement
National Weather Service Goodland KS
309 PM MDT Sun Apr 21 2019
COZ091-212145-
Kit Carson County CO-
309 PM MDT Sun Apr 21 2019
...SIGNIFICANT WEATHER ADVISORY FOR NORTH CENTRAL KIT CARSON COUNTY
UNTIL 345 PM MDT...
At 309 PM MDT, Doppler radar was tracking a strong thunderstorm 4
miles north of Vona, or 7 miles northwest of Stratton, moving north
at 5 mph.
Nickel size hail will be possible with this storm.
Locations impacted include...
Vona.
This includes Interstate 70 in Colorado near mile marker 411.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.
&&
LAT...LON 3957 10266 3957 10264 3932 10260 3928 10278
3951 10292
TIME...MOT...LOC 2109Z 163DEG 6KT 3936 10271
VincentPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GOODLAND KS
321 PM MDT SUN APR 21 2019
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0310 PM HAIL 10 S SHARON SPRINGS 38.75N 101.74W
04/21/2019 E0.88 INCH WALLACE KS TRAINED SPOTTER
HAIL STARTED OUT AS PEA THEN INCREASED TO
NICKEL SIZE, COVERING THE GROUND. HAIL
LASTED FOR ROUGHLY 8 MINUTES.
&&PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GOODLAND KS
322 PM MDT SUN APR 21 2019
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0314 PM TSTM WND GST 9 SSE SHARON SPRINGS 38.77N 101.68W
04/21/2019 M57 MPH WALLACE KS MESONET
&&The Goodland radar (KGLD), 118 km away, was scanning. The volume nearest the first event began at 21:22 UTC.
3 thunderstorm wind, 1 hail. Local standard time, as filed.
Several inches of hail is on the ground. The hail ranged from pea to golf ball in size.
Many power poles were blown down causing parts of Flagler to be without power. As of 8:40 PM MST, power was being restored to the west part of town.
Sustained winds of 58 MPH were also measured during the peak wind gust.
A semi trailer was blown on its side on I-70.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Colorado in 2019Every state in 2019This day in weather historyWarnings in Colorado, April 2019
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: 819291, 819293, 819297, 819296.