High based showers and thunderstorms produced gusty winds, with the highest gust reaching 73 mph 6 miles southeast of Holyoke, Colorado.
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The episode as NWS BOU wrote it up.
High based showers and thunderstorms produced gusty winds, with the highest gust reaching 73 mph 6 miles southeast of Holyoke, Colorado.
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 28, 12:04 PM MST, 1 hour 51 minutes earlier. Its key messages:
Area Forecast Discussion National Weather Service Denver/Boulder CO 104 PM MDT Sat Jun 28 2025 .KEY MESSAGES... - Hot today with a slight chance of afternoon showers and thunderstorms. - Cooler Sunday and Monday with higher coverage of storms and a threat for some of these storms to be strong to severe. - Early indications are showing a wet Fourth of July. && .DISCUSSION /Through Friday/... Issued at 237 PM MDT Fri Jun 27 2025 Radar shows isolated showers and storms this afternoon mainly from Monument Hill to Brush. Radar is also picking up many small microbursts under these showers and storms. Soundings show a mixed layer up to around 600 mb and the SPC mesoanalysis page shows DCAPE around 1,600 j/kg across the eastern plains. Both of these would indicate storms are capable of producing gusts up to 50 mph with isolated 60 mph wind gusts. Small hail is possible as well although severe hail is not expected. Saturday will be nearly a repeat of Friday. Isolated storms will form in the afternoon and with healthy DCAPE values, gusts up to 50 mph will be possible out of storms. The only changes for tomorrow are that the temperatures will be a degree or two warmer and there may be a slight decrease in coverage of showers and storms due to warmer air aloft. Models have major disagreements about a cold front moving through on Sunday. Some models barely have any sign of a cold front and keep highs around 90 across the plains. Other models show a rather strong cold front with highs in the low to mid 80s across the plains. How strong this front ends up being will determine the location and strength of storms. If the front is stronger, there will be higher upslope wind speeds and dew points close to 60 degrees. This could lead to strong to severe storms that form closer to the I-25 corridor given mixed-layer CAPE around 2,000 j/kg. The limiting factor will be deep layer shear in that scenario as values may only be around 30-35 knots. If the front is weaker, there will be less instability and upslope flow. This would lead to lower coverage of storms and would keep the severe threat closer to the CO/NE border. At this time, the scenario with the stronger front is favored and highs were decreased slightly and PoPs were increased slightly. On Monday, there will be easterly winds throughout the day across the plains that will bring healthy moisture up to the foothills and I-25 corridor. This upslope flow with healthy moisture will lead to good coverage of storms (50-70% coverage) in the foothills and southern I-25 corridor. Some storms could be strong to severe. An upper level ridge will be directly over Colorado on Tuesday and Wednesday. This will lead to warming and drying conditions. With that being said, isolated afternoon showers and storms will be possible mainly over the higher terrain. The aforementioned ridge will move eastward towards Kansas on Thursday and Friday as an upper level trough will move over the Intermountain West. In between these features, the southerly flow will draw up moisture from the Gulf of California. This moisture along with slight upslope forcing ahead of the trough, will lead to scattered to widespread coverage of showers and storms each day. Unfortunately, the Fourth of July could be a wet one this year. && .AVIATION /18Z TAFS through 18Z Sunday/... Issued at 1255 PM MDT Sat Jun 28 2025 VFR conditions expected through tonight. Light winds are expected this afternoon with the exception of possible virga producing moderate gusts. High resolution models don't show much in the way of showers this afternoon over the Denver metro given the warm and dry air aloft but a PROB30 for gusts up to 30 knots was added. A cold front will move through tomorrow morning which will shift winds to the northeast. It is possible that stratus develops given the relatively cool air undercutting the warmer air aloft. This stratus would be around 2,000-3,000 feet if it were to develop a broken cloud deck but it is unlikely. With more moisture arriving and better upslope flow, storms are likely to impact the terminals tomorrow so a TEMPO was included for wind gusts. && .BOU WATCHES/WARNINGS/ADVISORIES... None. && DISCUSSION...Danielson AVIATION...Danielson
Hazardous Weather Outlook National Weather Service Denver/Boulder CO 1056 AM MDT Sat Jun 28 2025 COZ030>051-291700- 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- 1056 AM MDT Sat Jun 28 2025 This hazardous weather outlook is for northeast and north central Colorado. .DAY ONE...Today and Tonight Afternoon thunderstorms today may produce strong wind gusts up to 55 mph across the far northeast corner of Colorado. .DAYS TWO THROUGH SEVEN...Sunday through Friday A cold front will bring cooler temperatures on Sunday and Monday. This will also bring the potential for strong to severe storms each day with large hail and damaging wind gusts being the primary threats. Tuesday and Wednesday look to be warmer and drier. Thursday and the Fourth of July look to be wet with scattered to widespread afternoon showers and storms. .SPOTTER INFORMATION STATEMENT... Spotter activation is not needed today.
The Cheyenne radar (KCYS), 75 km away, was scanning. The volume nearest the first event began at 23:51 UTC.
3 thunderstorm wind, 1 high wind. Local standard time, as filed.
A high based shower produced a 62 mph wind gust.
CDOT station south of Holyoke on US 385.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Colorado in 2025Every state in 2025This day in weather historyWarnings in Colorado, June 2025
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: 1257865, 1261321, 1261319, 1261317.