During the evening hours, a cluster of thunderstorms moved off the Colorado Front Range and east across the northeastern corner of the state. These storms generally stayed weak; however, on the back edge of a storm cluster in Yuma County winds briefly gusted to 59 mph.
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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 evening hours, a cluster of thunderstorms moved off the Colorado Front Range and east across the northeastern corner of the state. These storms generally stayed weak; however, on the back edge of a storm cluster in Yuma County winds briefly gusted to 59 mph.
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 Jun 17, 7:56 PM MST, 19 minutes earlier.
Area Forecast Discussion National Weather Service Goodland KS 856 PM MDT Thu Jun 17 2021 .UPDATE... Issued at 852 PM MDT Thu Jun 17 2021 No major changes have been made to the forecast. Widely scattered clusters of showers/storms persists into Yuma and extreme northwest Kit Carson counties. Confidence is low how far east the rainfall will be able to survive. && .SHORT TERM...(This evening through Friday Night) Issued at 248 PM MDT Thu Jun 17 2021 Relatively hot temperatures will be present to finish the work week. A few temperatures today have already neared their record for the day and many locations were at 100 by noon. Thunderstorms will be possible in the evening both days and generally favor Eastern Colorado and north of I-70. Right now, the 500mb ridge remains centered over the four corners region. Through friday night, the ridge will slowly lose some of its influence over the area as a trough digs into it from the north. There is potential for shortwave to move through the resulting northwest flow Friday. Near the surface, a frontal boundary and broad area of low pressure is currently in Southern Nebraska and will slowly move south into the area through the period. It is then forecasted to stall through Friday midday before pushing further south. For the rest of this afternoon, temperatures will be in the 100's with temperatures in the upper 100's possible mainly east of highway 83. While dewpoints are dropping, heat index values are already in the low 100's. Between this and the very warm temperatures, will keep the heat advisory and let it expire this evening. Later this evening, storms could form in Eastern Colorado where the frontal boundary and a dryline are located. There is a little bit of moisture aloft as suggested by higher RH values inbetween 850-500mb. But with such dry conditions near the surface, storms will likely not produce much rainfall. Storms will also have difficulty surviving away from the boundaries with the drier surface conditions and CIN above 75 J/KG. Henceforth, just have a slight chance mainly in Eastern Colorado and north of I-70 with POPs diminishing as the storms and dryline move more towards the east and into more stable air. The lows for tonight are expected to be in the 60's with 70's east of highway 83. Friday, another relatively hot day with temperatures in the 90's and 100's which would still be above normal for this time of year. With the frontal boundary moving slowly to the south, locations closer to central KS could still hit 100 during the day. As mentioned previously, a shortwave has been forecasted to move through the area from the northwest. With the shortwave, a broad surface low pressure system to the southwest, and some moisture aloft, thunderstorms will be possible again. Currently, the chance for storms looks better along and west of the CO border, but some model guidance suggests that storms could move further east. The main limitation for that is the environment looks to be more stable to the east and there may not be a boundary for storms to form and survive on further to the east. Tomorrow night is looking to be cloudy with much of the cloud cover coming from the storms earlier in the evening. Lows are expected to be slightly lower with most of the area in the 60's. .LONG TERM...(Saturday through Thursday) Issued at 345 PM MDT Thu Jun 17 2021 Overview: The synoptic pattern over the High Plains will transition to NW flow aloft this weekend.. as an upper level ridge amplifies along the Pacific coast. Broadly speaking, expect cooler temperatures and an increased potential for convection (along with a potential for episodic severe weather) via progressive shortwave energy in WNW-NW flow aloft.. the first of which will progress eastward across central portions of the Rockies and High Plains Sat aft/eve.. followed by more pronounced shortwave energy progressing SSE-SE from British Columbia into the northern Rockies (Sat night) and central Plains (Sunday). With NW flow aloft entrenched over the High Plains through mid-week.. additional small amplitude waves are apt to progress across the region Mon-Wed. Sat-Sun: A frontal passage is expected in assoc/w the more pronounced shortwave energy on Sunday, however, model guidance (e.g. GFS/ECMWF) is in considerable disagreement with regard to the timing of this feature. It appears that FROPA timing on Sunday may be dependent upon the magnitude/extent of outflow emanating from upstream convection in Montana/Wyoming -- which would act to accelerate the boundary southward along the lee of the Rockies. With the above in mind.. significant uncertainty persists with regard to sensible weather conditions /specifics/ in this period. Mon-Wed: Episodic convection.. assoc/w small amplitude waves in NW flow aloft.. are possible throughout this period. && .AVIATION...(For the 00Z TAFS through 00Z Friday evening) Issued at 520 PM MDT Thu Jun 17 2021 High pressure continues across the High Plains creating mainly VFR conditions. A weak frontal boundary is currently draped across northeast Colorado into southwest Nebraska and is initiating widely scattered convection. Hazards for the KGLD and KMCK terminals with the convection would be cloud to ground lightning and isolated downburst winds; convection is expected to come to an end around sunset as daytime heating comes to an end. Another front is located north of the boundary across northeast Colorado and southwest Nebraska. This front is expected to slowly meander to the south throughout the night and impact KMCK and potentially KGLD. LLWS is in the forecast as the front moves through KMCK, did not introduce it for KGLD as confidence is low if the front will make it that far south. && .GLD WATCHES/WARNINGS/ADVISORIES... KS...NONE. CO...NONE. NE...NONE. && UPDATE...JN/TT SHORT TERM...KAK LONG TERM...VINCENT AVIATION...JN/TT
Hazardous Weather Outlook National Weather Service Goodland KS 725 PM MDT Thu Jun 17 2021 COZ090>092-KSZ001>004-013>016-027>029-041-042-NEZ079>081-190130- Yuma-Kit Carson-Cheyenne-Rawlins-Decatur-Norton-Sherman-Thomas- Sheridan-Graham-Wallace-Logan-Gove-Greeley-Wichita-Dundy-Hitchcock- Red Willow- 725 PM MDT Thu Jun 17 2021 /825 PM CDT Thu Jun 17 2021/ This hazardous weather outlook is for extreme southwest Nebraska... northwest Kansas and east central Colorado. .DAY ONE...TONIGHT... No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH THURSDAY... Another hot day is in store on Friday with afternoon high temperatures ranging from the low 90s into the triple digits. A marginal risk for severe thunderstorms exists for portions of the Tri-State area Friday and Saturday with damaging winds and large hail the primary threats. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected tonight.
PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE GOODLAND KS
315 PM MDT THU JUN 17 2021
...SUMMARY OF EXTREME TEMPERATURES ACROSS THE TRI-STATE AREA (AS OF
3:15 PM MDT) ON THURSDAY JUNE 17, 2021...
===================================================================
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
===================================================================
0235 PM EXCESSIVE HEAT 1 NNW OBERLIN 39.83N 100.53W
06/17/2021 M108 F DECATUR KS AWOS
AIR TEMPERATURE OF 108F (42.0C) MEASURED AT
THE AWOS IN OBERLIN (KOIN) AT 2035 UTC.
0257 PM EXCESSIVE HEAT 2 NW HAIGLER 40.03N 101.97W
06/17/2021 M108 F DUNDY NE MESONET
AIR TEMPERATURE OF 108F MEASURED AT MESONET
STATION NE027 HAIGLER ON US 34 @ MP.
0257 PM EXCESSIVE HEAT 2 ENE COLBY 39.39N 101.02W
06/17/2021 M108 F THOMAS KS MESONET
AIR TEMPERATURE OF 108F MEASURED AT MESONET
STATION CW0352 2 E COLBY.
1255 PM EXCESSIVE HEAT 1 NNW OBERLIN 39.83N 100.53W
06/17/2021 M107 F DECATUR KS AWOS
AIR TEMPERATURE OF 107F (41.8C) MEASURED AT
THE AWOS IN OBERLIN (KOIN) AT 1855 UTC.
0153 PM EXCESSIVE HEAT 2 E MCCOOK 40.20N 100.58W
06/17/2021 M107 F RED WILLOW NE ASOS
AIR TEMPERATURE OF 107F (41.7C) MEASURED AT
THE ASOS IN MCCOOK (KMCK) AT 1953 UTC.
0155 PM EXCESSIVE HEAT 1 NNW OBERLIN 39.83N 100.53W
06/17/2021 M107 F DECATUR KS AWOS
AIR TEMPERATURE OF 107F (41.5C) MEASURED AT
THE AWOS IN OBERLIN (KOIN) AT 1955 UTC.
0157 PM EXCESSIVE HEAT 2 NW HAIGLER 40.03N 101.97W
06/17/2021 M107 F DUNDY NE MESONET
AIR TEMPERATURE OF 107F AT MESONET STATION
NE027 HAIGLER ON US 34 @ MP.
0157 PM EXCESSIVE HEAT 5 W TRENTON 40.18N 101.10W
06/17/2021 M107 F HITCHCOCK NE MESONET
AIR TEMPERATURE OF 107F AT MESONET STATION
NE006 TRENTON-MACKLIN BAY ON US 34 @ MP
56.06.
0201 PM EXCESSIVE HEAT 2 ENE COLBY 39.39N 101.02W
06/17/2021 M107 F THOMAS KS MESONET
AIR TEMPERATURE OF 107F AT MESONET STATION
CW0352 2 E COLBY.
0235 PM EXCESSIVE HEAT 2 N ATWOOD 39.84N 101.04W
06/17/2021 M107 F RAWLINS KS MESONET
AIR TEMPERATURE OF 107F (41.5C) MEASURED AT
THE AWOS IN ATWOOD (KADT) AT 2035 UTC.
0245 PM EXCESSIVE HEAT 8 NNW DANBURY 40.13N 100.48W
06/17/2021 M107 F RED WILLOW NE MESONET
AIR TEMPERATURE OF 107F MEASURED AT MESONET
STATION NB078 INDIANOLA 8SW.
0253 PM EXCESSIVE HEAT 1 E HILL CITY 39.37N 99.83W
06/17/2021 M107 F GRAHAM KS ASOS
AIR TEMPERATURE OF 107F (41.7C) MEASURED AT
THE ASOS IN HILL CITY (KHLC) AT 2053 UTC.
0305 PM EXCESSIVE HEAT 8 NNW STRATTON 40.26N 101.28W
06/17/2021 M107 F HITCHCOCK NE MESONET
MESONET STATION DW2911 8 N STRATTON HEAT
INDEX OF 107 AIR TEMP OF 105.
0155 PM EXCESSIVE HEAT 2 N ATWOOD 39.84N 101.04W
06/17/2021 M106 F RAWLINS KS MESONET
AIR TEMPERATURE OF 106F (41.0C) MEASURED AT
THE AWOS IN ATWOOD (KADT) AT 1955 UTC.
0200 PM EXCESSIVE HEAT 8 NNW STRATTON 40.26N 101.28W
06/17/2021 M106 F HITCHCOCK NE MESONET
AIR TEMPERATURE OF 106F AT MESONET STATION
DW2911 8 N STRATTON.
0205 PM EXCESSIVE HEAT 8 NNW DANBURY 40.13N 100.48W
06/17/2021 M106 F RED WILLOW NE MESONET
AIR TEMPERATURE OF 106F AT MESONET STATION
NB078 INDIANOLA 8SW.
1253 PM EXCESSIVE HEAT 2 E MCCOOK 40.20N 100.58W
06/17/2021 M105 F RED WILLOW NE ASOS
AIR TEMPERATURE OF 105F (40.6C) MEASURED AT
THE ASOS IN MCCOOK (KMCK) AT 1853 UTC.
0115 PM EXCESSIVE HEAT 2 N ATWOOD 39.84N 101.04W
06/17/2021 M105 F RAWLINS KS MESONET
AIR TEMPERATURE OF 105F (40.8C) MEASURED AT
THE AWOS IN ATWOOD (KADT) AT 1915 UTC.
0153 PM EXCESSIVE HEAT 1 E HILL CITY 39.37N 99.83W
06/17/2021 M105 F GRAHAM KS ASOS
AIR TEMPERATURE OF 105F (40.6C) MEASURED AT
THE ASOS IN HILL CITY (KHLC) AT 1953 UTC.
0155 PM EXCESSIVE HEAT SAINT FRANCIS 39.77N 101.80W
06/17/2021 M105 F CHEYENNE KS AWOS
AIR TEMPERATURE OF 105F (40.3C) MEASURED AT
THE AWOS IN ST. FRANCIS (KSYF) AT 1955 UTC.
0159 PM EXCESSIVE HEAT 11 NNE GOODLAND 39.49N 101.63W
06/17/2021 M105 F SHERMAN KS MESONET
AIR TEMPERATURE OF 105F MEASURED AT MESONET
STATION CW9922 10.3 NNE GOODLAND.
0205 PM EXCESSIVE HEAT 2 N IDALIA 39.73N 102.30W
06/17/2021 M105 F YUMA CO MESONET
AIR TEMPERATURE OF 105F MEASURED AT MESONET
STATION IDL01 2 N IDALIA 2.
0205 PM EXCESSIVE HEAT 5 NW TASCO 39.41N 100.36W
06/17/2021 M105 F SHERIDAN KS MESONET
AIR TEMPERATURE OF 105F MEASURED AT MESONET
STATION 3859D 5 NW TASCO.
0206 PM EXCESSIVE HEAT 11 S SHARON SPRINGS 38.74N 101.73W
06/17/2021 M105 F WALLACE KS MESONET
AIR TEMPERATURE OF 105F MEASURED AT MESONET
STATION EW7715 11 S SHARON SPRINGS.
0218 PM EXCESSIVE HEAT 9 WSW WINONA 39.00N 101.39W
06/17/2021 M105 F LOGAN KS MESONET
AIR TEMPERATURE OF 105F MEASURED AT MESONET
STATION UP840 9.0 W WINONA (UPR).
0235 PM EXCESSIVE HEAT 3 SE OAKLEY 39.10N 100.82W
06/17/2021 M105 F LOGAN KS AWOS
AIR TEMPERATURE OF 105F (40.3C) MEASURED AT
THE AWOS IN OAKLEY (KOEL) AT 2035 UTC.
0245 PM EXCESSIVE HEAT HALE 39.63N 102.12W
06/17/2021 M105 F YUMA CO MESONET
AIR TEMPERATURE OF 105F MEASURED AT MESONET
STATION TT563 SOUTH REPUBLICAN.
0255 PM EXCESSIVE HEAT 1 NNW OBERLIN 39.83N 100.53W
06/17/2021 M105 F DECATUR KS AWOS
AWOS STATION KOIN OBERLIN HEAT INDEX OF 105,
AIR TEMP OF 107.
&&
VINCENTPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GOODLAND KS
332 PM MDT THU JUN 17 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0320 PM EXCESSIVE HEAT 5 NW TASCO 39.41N 100.36W
06/17/2021 M105 F SHERIDAN KS MESONET
MESONET STATION 3859D 5 NW TASCO REPORTS
HEAT INDEX OF 105 AND AIR TEMPERATURE OF
107.
&&
TTSpecial Weather Statement
National Weather Service Goodland KS
902 PM MDT Thu Jun 17 2021
COZ090-KSZ001-NEZ079-180345-
Yuma County CO-Cheyenne KS-Dundy NE-
902 PM MDT Thu Jun 17 2021
...SIGNIFICANT WEATHER ADVISORY FOR YUMA COUNTY IN NORTHEASTERN
COLORADO...NORTHWESTERN CHEYENNE COUNTY IN NORTHWESTERN KANSAS AND
SOUTHWESTERN DUNDY COUNTIES IN SOUTHWESTERN NEBRASKA UNTIL 945 PM
MDT/1045 PM CDT/...
At 902 PM MDT/1002 PM CDT/, Doppler radar was tracking strong
thunderstorms along a line extending from 5 miles west of Haigler to
14 miles northeast of Cope. Movement was southeast at 5 mph.
Pea size hail and wind gusts up to 50 mph will be possible with these
storms.
Locations impacted include...
Yuma, Wray, Eckley, Haigler, Abarr, Beecher Island and Wauneta.
This includes Highway 385 between mile markers 216 and 259.
LAT...LON 3984 10160 3960 10268 3973 10280 4015 10280
4030 10223
TIME...MOT...LOC 0302Z 298DEG 6KT 4003 10203 3984 10269
JNThe Goodland radar (KGLD), 107 km away, was scanning. The volume nearest the first event began at 03:15 UTC.
1 thunderstorm wind. Local standard time, as filed.
Reported via Weather Underground, mesonet station KCOYUMA15 recorded a 59 mph wind gust.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Colorado in 2021Every state in 2021This day in weather historyWarnings in Colorado, June 2021
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: 966045.