Two tornadoes down briefly in Elbert and Park counties in the morning, but no damage was observed. Later in the afternoon, another tornado entered Park County and uprooted several softwood trees.
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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 BOU wrote it up.
Two tornadoes down briefly in Elbert and Park counties in the morning, but no damage was observed. Later in the afternoon, another tornado entered Park County and uprooted several softwood trees. One shed was destroyed in Park County on Apache Rd. In Larimer County, a strong thunderstorm produced hail up to nickel size.
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 Denver/Boulder, CO wrote its last area forecast discussion before the first event at Jun 30, 2:53 AM MST, 5 hours 7 minutes earlier.
Area Forecast Discussion National Weather Service Denver/Boulder CO 353 AM MDT Fri Jun 30 2023 .SHORT TERM...(Today and tonight) Issued at 352 AM MDT Fri Jun 30 2023 The mid level trough axis will move across the area this afternoon into early evening. There's still a little lift this morning which could produce a few weak showers/storms, then the main area of forcing will move across the mountains during the middle of the day, the I-25 corridor early to mid afternoon, and the plains in the late afternoon and evening. Models have been pretty consistent in showing a line of storms developing by early afternoon along the trough axis, with only isolated storms for a few hours behind that as the atmosphere dries. We already have fairly high PoPs at about the right time, so only minor changes were needed. We still have some low PoPs in the early evening for Denver, but that may be too much for too long. With cooler temperatures today, the severe threat will be lower. There will still likely be around 1000 J/kg CAPE as the storms come off the foothills which could allow for some marginally severe hail and wind gusts, but the storms should mostly be nonsevere and the linear nature may mean that most places just get a quick shot of rain and wind. For tonight, there's drying but there may still be some clouds. There could be patchy fog, but with the amount of drying uncertain and weak drainage winds developing we've left it out for now. We did drop tonight's lows slightly on the plains. .LONG TERM...(Saturday through Thursday) Issued at 352 AM MDT Fri Jun 30 2023 The upper level trough that brought the showers and thunderstorms the past couple of days will be east of Colorado Saturday with a northwest flow aloft. Drier and warmer air will move into the area. However, temperatures will remain below normal with highs in the upper 70s to mid 80s for northeast Colorado. Chances for showers and thunderstorms will be low. Best chance for weak convection will be over the eastern plains, closer to the exiting trough and also over the higher terrain. The airmass will be drying and mid level temperatures will be warming, not a good recipe for convection. The warming trend continues for Sunday and Monday as upper level ridging builds over the southwest part of the country. Models are showing a weak wave embedded in the northwest flow aloft for Colorado and Wyoming on Sunday. Moisture and instability will not be as impressive as the past couple days, but enough should be around for isolated to scattered convection. Weak ridging for Monday should keep the region dry with warmer temperatures. Highs are expected to be near normal with readings in the upper 80s to lower 90s across northeast Colorado. Models start to diverge Tuesday through the later part of next week. They generally show an upper level trough moving east across the North Rockies. The GFS is quicker bringing lift from the trough and a cold front in time for scattered to numerous showers and storms for the Fourth of July. The ECWMF is deeper, but slower with the trough, which would keep the Fourth of the July warmer and drier. By Wednesday, the cold front should be through the area with cool moist easterly upslope flow at the surface. A similar pattern is expected for Thursday as well. This will keep temperatures below normal east of the mountains with good chances for thunderstorms. && .AVIATION...(For the 06Z TAFS through 06Z Friday night) Issued at 1215 AM MDT Fri Jun 30 2023 Scattered thunderstorms will move out of the Denver area by 08z. MVFR ceilings will prevail through about 15z, then some improvement is expected, but Instrument approaches to KDEN will likely be needed through 18z and possibly all day Friday. Thunderstorms are expected again between 20z and 23z, with a brief period of west winds gusting to 35 knots along with heavy rain and MVFR ceilings. VFR conditions are expected by 00z. && .HYDROLOGY... Issued at 352 AM MDT Fri Jun 30 2023 Airmass dries out for Saturday with only low chances for weak showers and thunderstorms. There will be an increase in storms for Sunday, though moisture doesn't look as impressive as with the previous systems we have seen. This is expected to keep the flash flood threat low. && .BOU WATCHES/WARNINGS/ADVISORIES... None. && SHORT TERM...Gimmestad LONG TERM...Meier AVIATION...Gimmestad HYDROLOGY...Gimmestad/Meier
Hazardous Weather Outlook National Weather Service Denver/Boulder CO 543 AM MDT Fri Jun 30 2023 COZ030>051-011145- Jackson County Below 9000 Feet- West Jackson and West Grand Counties Above 9000 Feet- Grand and Summit Counties Below 9000 Feet- South and East Jackson/Larimer/North and Northeast Grand/ Northwest Boulder Counties Above 9000 Feet- South and Southeast Grand/West Central and Southwest Boulder/ Gilpin/Clear Creek/Summit/North and West Park Counties Above 9000 Feet-Larimer and Boulder Counties Between 6000 and 9000 Feet- Jefferson and West Douglas Counties Above 6000 Feet/Gilpin/Clear Creek/Northeast Park Counties Below 9000 Feet- Central and Southeast Park County- Larimer County Below 6000 Feet/Northwest Weld County- Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County- North Douglas County Below 6000 Feet/Denver/West Adams and Arapahoe Counties/East Broomfield County- Elbert/Central and East Douglas Counties Above 6000 Feet- Northeast Weld County-Central and South Weld County-Morgan County- Central and East Adams and Arapahoe Counties- North and Northeast Elbert County Below 6000 Feet/North Lincoln County- Southeast Elbert County Below 6000 Feet/South Lincoln County- Logan County-Washington County-Sedgwick County-Phillips County- 543 AM MDT Fri Jun 30 2023 This hazardous weather outlook is for northeast and north central Colorado. .DAY ONE...Today and Tonight Thunderstorms will develop over the mountains by midday, and move east across the Front Range cities this afternoon and across the plains through the evening. Some of the stronger storms could be severe with hail around an inch in diameter and wind gusts up to 60 mph. The greatest threat of severe weather is on the plains south of Interstate 70 where larger hail is possible. Locally heavy rain and minor flooding is also possible with some of the storms. The greatest flood threat is in the Cameron Peak burn area this afternoon. .DAYS TWO THROUGH SEVEN...Saturday through Thursday Saturday will be drier with only a few weak showers and storms expected. Thunderstorm activity temporarily increases Sunday as a weak system pushes across the region. After a lull in thunderstorm activity on Monday, scattered afternoon and evening thunderstorms are expected to resume Tuesday and for most of next week. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated today or tonight. Gimmestad/Meier
The Denver radar (KFTG), 143 km away, was scanning. The volume nearest the first event began at 15:00 UTC.
3 tornado, 1 hail. Local standard time, as filed.
A tornado touched down briefly in open country. No damage was observed.
A tornado touched down briefly in open country. No damage was observed.
A tornado touched down and uprooted several softwood trees. Minor damage was also observed at a residence.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Colorado in 2023Every state in 2023This day in weather historyThe tornado archive for Colorado, 2023Warnings in Colorado, June 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: 1109266, 1109264, 1109265, 1117647.