Isolated severe thunderstorms produced intense straight-line winds.
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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.
Isolated severe thunderstorms produced intense straight-line winds.
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, 2:49 PM MST, 30 minutes earlier.
Area Forecast Discussion National Weather Service Denver/Boulder CO 349 PM MDT THU JUN 30 2016 .SHORT TERM...(This evening through Friday) Issued at 349 PM MDT Thu Jun 30 2016 Convection is breaking out as expected. Upper winds remain about the same with 10 knot winds at 500 mb. Storm motions so far as expected, around 10 knots with some variability based on storm inflow/outflow. Still expecting some slowing/more variability as they move east and southward on the plains overnight. The main threat of flash flooding should be across east central Colorado where the upper winds are lighter and there may be better surface inflow. However even in the north the storms will be slow moving and efficient rain producers so there is a flash flood risk from the foothills eastward. Models hint at convection eventually focusing on an area of convergence across east central Colorado around midnight and what we are seeing now may be the beginning of the evolution of that feature. Threat should be diminishing further west by midnight but there are several hints of outflow pushing westward and redevelopment nearer the foothills. As a result we decided not to get fancy with the watch and left it for all areas until 2 am. Tonight's main convective blob should be moving out by morning, but there is decent agreement on another band of upper level focing coming over in the morning, so I increased morning POPs. Probably cool enough for showers but still some thunder threat. Then in the afternoon there is a little drying aloft which could lead to some sun and a bit more instability. By that time there should be a bit more west wind aloft and low level winds will hopefully not be opposing the upper levels anymore, so we should see a bit faster storm motions, maybe 10-15 mph. Still a favorable heavy rain environment, but with the faster storm motions it should be a more typical flooding threat, mainly intense rain but for less than an hour for most of the storms. There may be more of a hail/wind threat as the wind profile will be better for tilted and/or rotating storms. .LONG TERM...(Friday night through Thursday) Issued at 349 PM MDT Thu Jun 30 2016 Friday night and Saturday...weak mid level qg ascent will be over the region as a slow moving upper trough makes its way across the state. NAM12 does show good capes at 00z Saturday...around 1100 j/kg at kden and adjacent plains...with precipitable water values still around 1.3 inches. Storm motions around 10 kts. Main issue will continue to be heavy rainfall with the stronger storms...with the potential for localized flash flooding. A marginal severe threat as well with the best directional shear and highest surface based CAPE wl be over the Palmer Divide. On Saturday...should have another good chance of thunderstorms producing heavy rainfall. Forecast soundings do show some mid level drying and lower precipitable water values at kden. By 21z those values are progged to be around 0.80 inches...but still closer to one inch east of the Urban Corridor. Overall those values are still pretty healthy. Mid level drying may help increase the severe potential with a few of the storms... especially over the Palmer Divide. Forecast sounding yield capes 1500-2000 J/kg at 21z Saturday. By Saturday evening...the upper trough moves to the east with weak downward qg descent as an upper level ridge moves into CO fm the west. No significant changes in the grids for Sunday through Thursday. A broad upper ridge will remain over the southwest and south central U.S. Subtropical moisture under the ridge will continue to advect into the state. It will be warmer but there will be at least a slight chance of aftn/evng thunderstorms each day...especially over the higher terrain and far eastern plains. && .AVIATION...(For the 18Z TAFS through 18Z Friday afternoon) Issued at 349 PM MDT Thu Jun 30 2016 Scattered thunderstorms will continue through this afternoon. Localized MVFR is possible in the showers along with variable winds gusting to around 30 knots. KDEN traffic may need instrument approaches due to the ceilings and showers. More widespread rain and thunderstorms are expected tonight, especially in the evening, with areas of MVFR conditions. Scattered showers and thunderstorms are expected on Friday, more numerous in the afternoon. KDEN instrument approaches may be needed at times, but VFR conditions are expected to prevail. && .HYDROLOGY... Issued at 349 PM MDT Thu Jun 30 2016 Precipitable water rising to 1.3 inches, an 8-10 thousand foot deep warm cloud layer, and the slow and erratic storm motions create a very favorable environment tonight and we are just waiting to see how the mesoscale interactions evolve to focus the threat. We expect 2 inches of rain in an hour with the heavier storms, and 3-4 inches in 2-3 hours is possible with training cells if that organization occurs. On Friday storms should be moving faster, but a few storms could be able to produce 1-2 inches of rain in an hour. There will still be a small risk of flash flooding with the strongest storms. Friday night and Saturday...high precipitable water values around 1.3 inches will continue through Friday evening so the storms will likely produce very heavy rain with the potential for flash flooding. Storm motions will be west to east around 10 kts. On Saturday...some drying but still relatively high precipitable water amounts close to one inch. As a result...this may lessen the rainfall rates slightly and the threat potential for flash flooding. Threat will remain the highest in the burn scars and in areas where the soil is already saturated from heavy rain which is yet to be determined at this time. && .BOU Watches/Warnings/Advisories... Flash Flood Watch through late tonight for COZ035-036-038>051. && SHORT TERM...Gimmestad LONG TERM...Cooper AVIATION...Gimmestad HYDROLOGY...Gimmestad/Cooper
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE DENVER/BOULDER CO 1133 AM MDT THU JUN 30 2016 COZ030>051-011745- 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- 1133 AM MDT THU JUN 30 2016 ...THUNDERSTORMS WITH AREAS OF HEAVY RAIN EXPECTED THIS EVENING... THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST AND NORTH CENTRAL COLORADO. .DAY ONE...TODAY AND TONIGHT SHOWERS AND THUNDERSTORMS WILL DEVELOP THIS AFTERNOON AND BECOME MORE NUMEROUS THIS EVENING. THE STORMS WILL BE SLOW MOVING IN A MOIST ENVIRONMENT...SO SOME OF THEM WILL PRODUCE HEAVY RAIN. AT THIS TIME IT LOOKS LIKE THERE IS A MODERATE THREAT OF FLASH FLOODING WITH AREAS ALONG AND SOUTH OF INTERSTATE 70 FAVORED. RAINFALL AMOUNTS OF UP TO 2 INCHES IN AN HOUR ARE POSSIBLE WITH THE STRONGER STORMS. LARGER SCALE FLOODING IS POSSIBLE ON THE PLAINS IF THE STORMS ORGANIZE ENOUGH TO STAY OVER AN AREA FOR LONGER THAN AN HOUR AND PRODUCE SEVERAL INCHES OF RAIN. WHILE HEAVY RAIN IS THE MAIN THREAT...THERE IS ALSO A SMALL THREAT OF SEVERE THUNDERSTORMS ON THE PLAINS THIS AFTERNOON WITH HAIL UP TO ONE INCH IN DIAMETER AND WIND GUSTS TO 60 MPH POSSIBLE. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY IT WILL REMAIN RELATIVELY COOL WITH A GOOD CHANCE OF AFTERNOON AND EVENING SHOWERS AND THUNDERSTORMS FOR FRIDAY AND SATURDAY. HEAVY RAIN WILL BE POSSIBLE WITH THE STORMS...ESPECIALLY LATE FRIDAY AFTERNOON AND EVENING DUE TO A VERY MOIST AIRMASS. SOME OF THE STORMS COULD PRODUCE 1 TO 2 INCHES OF RAIN IN LESS THAN ONE HOUR. THERE IS ALSO A SMALL THREAT OF SEVERE THUNDERSTORMS AGAIN. A WARMING AND DRYING TREND IS EXPECTED OVER THE FOURTH OF JULY WEEKEND...WITH TEMPERATURES CLIMBING BACK INTO THE 90S BY THE MIDDLE OF NEXT WEEK...WITH GENERALLY A SLIGHT CHANCE OF AFTERNOON AND EVENING THUNDERSTORMS EACH DAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY OR TONIGHT. GIMMESTAD/COOPER
The Denver radar (KFTG), 67 km away, was scanning. The volume nearest the first event began at 22:20 UTC.
2 thunderstorm wind. Local standard time, as filed.
The storm also produced small hail and heavy rain, 1.4 inches in 20 minutes.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Colorado in 2016Every state in 2016This day in weather historyWarnings in Colorado, June 2016
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: 640460, 640458.