In the middle afternoon, storms began forming in northeastern Colorado. As the day progresses, a line of storm cells formed with one cell producing hail up to 4 inches and wind gusts estimated up to 80 MPH.
Every event with a place to put it. Tap one for its entry below.
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.
In the middle afternoon, storms began forming in northeastern Colorado. As the day progresses, a line of storm cells formed with one cell producing hail up to 4 inches and wind gusts estimated up to 80 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 Jul 8, 1:19 PM MST, 1 hour 11 minutes earlier.
Area Forecast Discussion National Weather Service Goodland KS 219 PM MDT Sat Jul 8 2023 .SHORT TERM...(This evening through Monday) Issued at 218 PM MDT Sat Jul 8 2023 As of 1:30 PM MDT, storms are beginning to develop over the northwest corner of the Tri-State area and up into Southeast Wyoming. So far the HRRR has had the best handle of the rapidly developing storms. These storms are expected to be scattered storms with supercells capable of producing all hazards. Storms are expected to impact areas generally along and west of US-83; however, the best likelihood for severe weather is expected along and west of the KS Highway 27 corridor from Dundy County, Nebraska to Wallace County, Kansas. A Severe Thunderstorm Watch is now in effect until 9 PM MDT for those on either side of the Colorado border. While all hazards are possible, the main ones of concern are up to 2" hail, wind gusts up to 70 mph, and heavy rainfall. A couple of tornadoes can't be ruled out mainly over Northeast Colorado, but confidence is low to moderate at this time. This environment is a bit different from the last few severe days as it is essentially a High Shear-Low CAPE day. Low level wind shear is out of the west to northwest at 30-60 kts, increasing throughout the evening. MLCAPE leave a bit to be desired with values ranging from 500-~1000 J/kg. There is a bit of a capping inversion along and east of the first row of counties in Kansas and Nebraska, which could limit severe storms moving further east over the area. Storms are expected to exit the Tri-State area completely between midnight and sunrise tomorrow morning though the severe threat should taper off during the evening hours. Overnight lows are expected to be in the mid to upper 50s tonight. Sunday is a bit quieter with little to no chance for precipitation for the area. The upper ridge is expected to move further over the area while a surface high moves over Kansas. Shortwave disturbances are expected to help develop/strengthen a lee trough later in the day. There may be an isolated As the disturbances move over, a few showers and storms may be triggered; however, confidence is very low at this time. Temperatures look to warm a bit more on Sunday with highs in the upper 70s to lower 80s. Overnight lows will be in the upper 50s to lower 60s. On Monday we are expected to be under the ridge, but there will be an upper shortwave move over from the Rockies during the afternoon hours. For much of the day, the Tri-State area is expected to be dry with temperatures reaching the upper 80s to lower 90s. During the evening hours, scattered showers and storms are possible. The main area of concern for any severe weather is mainly east of the Colorado border. The overnight low is expected to be mainly in the 60s. .LONG TERM...(Tuesday through Saturday) Issued at 102 PM MDT Sat Jul 8 2023 Sprawling upper ridge will move from the Southern Plains at the beginning of the period to the Desert Southwest by the end of the period. Warmest temperatures will be under the ridge, so will start the period with highs in the 90s both Tuesday and Wednesday, then cooling off towards the end of the period to the 80s. Cold frontal timing a little faster compared to previous runs and is moving through the forecast area during the day Thursday. Daily thunderstorm chances continue through the entire period. However, storms will be more scattered with proximity to the ridge Tuesday and Wednesday, then increasing in coverage for Thursday through Saturday as the area gets under northwest flow aloft. Deep layer shear appears that it will be sufficient for a severe risk, at or above 30 kts, the entire period. Front will also play a role on Thursday for convective initiation and enhanced severe threat, and is the same day deep layer shear is forecast to be around 50 kts. Given daily rounds of storms and increasing moisture, especially Thursday and beyond, flooding will also be a potential hazard. && .AVIATION...(For the 18Z TAFS through 18Z Sunday afternoon) Issued at 1118 AM MDT Sat Jul 8 2023 KGLD: Ceilings should improve from MVFR to VFR over the next 2-3 hours as the low stratus continues to dissipate. There is potential for scattered showers and storms to develop this afternoon around ~20-23Z around the area with more showers and storms moving near the terminal between 00Z and 05Z tonight. Winds are expected to remain out of the southeast through the evening at 10-15 kts with gusts to ~20 kts possible during the mid to late afternoon. Overnight winds will shift to become more southerly at 5-10 kts through the end of the period. KMCK: VFR conditions are anticipated through the end of the period with winds out of the east to east-southeast at 5-10 kts through ~12Z Sunday. After 12Z, winds are expected to become more southerly for the remainder of the period with speeds of 5-10 kts. There is potential for showers and possibly storms to move within the vicinity of the terminal during the late afternoon and evening hours; however, confidence is too low at this time to include in the TAFs. && .GLD WATCHES/WARNINGS/ADVISORIES... KS...NONE. CO...NONE. NE...NONE. && SHORT TERM...KMK LONG TERM...024 AVIATION...KMK
Hazardous Weather Outlook National Weather Service Goodland KS 127 PM MDT Sat Jul 8 2023 COZ090>092-KSZ001>004-013>016-027>029-041-042-NEZ079>081-091930- Yuma-Kit Carson-Cheyenne-Rawlins-Decatur-Norton-Sherman-Thomas- Sheridan-Graham-Wallace-Logan-Gove-Greeley-Wichita-Dundy-Hitchcock- Red Willow- 127 PM MDT Sat Jul 8 2023 /227 PM CDT Sat Jul 8 2023/ This hazardous weather outlook is for extreme southwest Nebraska... northwest Kansas and east central Colorado. .DAY ONE...THIS AFTERNOON AND TONIGHT... Strong to severe thunderstorms are possible across portions of the region today and tonight. The area of focus will be locales along and west of a line from McCook, Nebraska to Oakley, Kansas. The best chance for severe weather is along and west of Kansas Highway 27 where a Severe Thunderstorm Watch is in effect until 9 PM MDT. Threats from any storms will include large hail, damaging wind gusts, and locally heavy rainfall that could lead to flash flooding. A few isolated tornadoes are even possible. Storms should be completely out of the area by sunrise Sunday morning. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH SATURDAY... There will be afternoon and evening chances for thunderstorms across portions of the Tri State region through next week. The best chance for these will occur in the latter portion of next week. Some of the storms that do occur will produce locally heavy rainfall that may produce some flooding concerns. .SPOTTER INFORMATION STATEMENT... Spotter activation may be required.
Special Weather Statement
National Weather Service Goodland KS
135 PM MDT Sat Jul 8 2023
NEZ079-082000-
Dundy NE-
135 PM MDT Sat Jul 8 2023
...A strong thunderstorm will impact portions of southeastern Dundy
County through 200 PM MDT...
At 134 PM MDT, Doppler radar was tracking a strong thunderstorm 7
miles west of Benkelman, moving east at 40 mph.
HAZARD...Winds in excess of 40 mph and penny size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is
possible.
This strong thunderstorm will be near...
Benkelman around 145 PM MDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
A Severe Thunderstorm Watch remains in effect until 900 PM MDT for
northwestern Kansas...and southwestern Nebraska.
&&
LAT...LON 4000 10132 4000 10179 4010 10180 4018 10132
TIME...MOT...LOC 1934Z 267DEG 34KT 4005 10168
MAX HAIL SIZE...0.75 IN
MAX WIND GUST...40 MPH
CASpecial Weather Statement
National Weather Service Goodland KS
429 PM CDT Sat Jul 8 2023
NEZ080-082200-
Hitchcock NE-
429 PM CDT Sat Jul 8 2023
...Strong thunderstorms will impact portions of Hitchcock County
through 500 PM CDT...
At 429 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from 4 miles southwest of Palisade to 4 miles north
of Stratton. Movement was southeast at 40 mph.
HAZARD...Winds in excess of 40 mph and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor damage to outdoor objects is
possible.
Strong thunderstorms will be near...
Trenton around 445 PM CDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
southwestern Nebraska.
&&
LAT...LON 4024 10076 4015 10076 4000 10089 4000 10110
4017 10133 4022 10133 4035 10117 4035 10109
TIME...MOT...LOC 2129Z 301DEG 34KT 4029 10115 4021 10124
MAX HAIL SIZE...0.88 IN
MAX WIND GUST...40 MPH
CAThe Goodland radar (KGLD), 113 km away, was scanning. The volume nearest the first event began at 21:28 UTC.
8 hail, 2 thunderstorm wind. Local standard time, as filed.
Hail up to baseballs in size reported to have accumulated at location via social media. Hail reported to have broken windows on a vehicle, put dents in a trailer, and have damaged trees.
Images received of hail damage to property. Reporter estimates up to softball sized hail based on dent sizes and the holes in glass windows.
Golf ball sized hail was reported.
Hail around golf ball size or slightly larger reported at location via social media.
Photo received via social media of wind damage to a large tree bending it almost at a 45 degree angle at the location.
Half dollar sized hail shredded leaves, created dents in vehicle and broke vehicle windows. There were also broken house windows.
Tree branches reported down due to thunderstorm wind gusts in Wray, CO.
Hail larger than golf balls in size reported via social media at location. Hail broke a vehicle side mirror and a tail light as well as put several dents into the vehicle.
Golf ball sized hail reported.
Pea to dime sized hail observed.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Colorado in 2023Every state in 2023This day in weather historyWarnings in Colorado, July 2023
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: 1117360, 1117361, 1117363, 1117384, 1117406, 1117382, 1117411, 1117370, 1117377, 1117415.