A severe thunderstorm produced two brief landspouts. In addition, a small boat was capsized by strong 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.
A severe thunderstorm produced two brief landspouts. In addition, a small boat was capsized by strong 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 Jul 28, 2:44 PM MST, 9 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE DENVER/BOULDER CO 344 PM MDT MON JUL 28 2014 .SHORT TERM...(THIS EVENING THROUGH TUESDAY) ISSUED AT 343 PM MDT MON JUL 28 2014 UPPER LEVEL RIDGE WILL BE SUPPRESSED INTO SOUTHERN NEW MEXICO AND INTO MEXICO TONIGHT AND TUESDAY AS SHORT WAVES ROUND THE RIDGE. MONSOONAL MOISTURE WILL ROTATE AROUND THE RIDGE AND CONTINUE TO STREAM OVER THE STATE. PRECIPITABLE WATER VALUES ARE AROUND ONE INCH ALONG THE FRONT RANGE. SCATTERED CONVECTION WILL CONTINUE INTO THE EARLY EVENING OVER THE HIGHER TERRAIN WITH HEAVY RAIN BEING THE BIGGEST THREAT. APPEARS THE LOWER ELEVATIONS ARE SOME WHAT CAPPED SO WILL LOWER POPS TO ISOLATED. CAN'T RULE OUT AN ISOLATED SEVERE WIND GUST THIS AFTERNOON AND EARLY EVENING...THOUGH THE TREAT IS LOW. WITH THE LACK OF UPPER LEVEL SUPPORT...STORMS WILL END LATE THIS EVENING AS THE AIRMASS STABILIZES. COULD SEE LOW CLOUDS TOWARDS DAY BREAK DUE TO THE MOIST AIRMASS...BUT SOME DRY AIR COULD PREVENT THIS. THE FIRST OF TWO SHORT WAVES WILL MOVE INTO COLORADO TUESDAY AND PROVIDE LARGE SCALE LIFT ACROSS NORTHEAST COLORADO. ISOLATED STORMS MAY FORM LATE TUESDAY MORNING. DURING THE AFTERNOON SCATTERED TO NUMEROUS STORMS ARE EXPECTED TO DEVELOP. MOISTURE WILL INCREASE THROUGH THE DAY. BY LATE AFTERNOON...PRECIPITABLE WATER VALUES WILL REACH AN INCH IN THE FOOTHILLS... 1.25 ACROSS THE URBAN CORRIDOR AND CLOSE TO 1.5 INCHES ON THE PLAINS. CAPES WILL REACH 500 TO 1000 J/KG...THIS COMBINED WITH SOME DIRECTION SHEAR IN THE ATMOSPHERE COULD LEAD TO A COUPLE MARGINAL SEVERE STORMS...WITH STRONG WINDS POSSIBLE. HOWEVER...MAIN CONCERN WITH THE STORMS WILL BE HEAVY RAIN WHERE ONE INCH OF RAINFALL COULD FALL IN AS LITTLE AS 15-20 MINUTES FROM THE STRONGEST STORMS. THREAT FOR FLASH FLOODING WILL BE HIGH AND CONTINUE INTO TUESDAY NIGHT AND WEDNESDAY. A FLASH FLOOD WATCH HAS BEEN ISSUED FOR MUCH OF NORTHEAST COLORADO FOR TUESDAY AFTERNOON AND MOST OF WEDNESDAY. FOR ADDITIONAL DETAILS ABOUT THE HEAVY RAIN THREAT...SEE THE HYDROLOGY SECTION BELOW. .LONG TERM...(TUESDAY NIGHT THROUGH MONDAY) ISSUED AT 343 PM MDT MON JUL 28 2014 SHOWERS AND THUNDERSTORMS TO CONTINUE TUESDAY NIGHT...WITH PERHAPS SOME DECREASE IN THE ACTIVITY OVERNIGHT AS SUBSIDENCE MOVES OVERHEAD. STEERING WINDS TO BE WEAK...SO SLOW MOVING STORMS EXPECTED. WITH MOIST AIRMASS IN PLACE...THREAT FOR LOCALLY HEAVY RAIN EXISTS ALONG WITH A FLASH FLOOD POTENTIAL. ON WEDNESDAY... NORTHWEST FLOW ALOFT CONTINUES WITH GOOD UPSLOPE UP TO ABOUT 650 MB. SHOWERS AND THUNDERSTORMS SHOULD BE ONGOING DURING THE MORNING...THOUGH THERE MAY BE A SLIGHT DECREASE WITH MID LEVEL SUBSIDENCE. BY AFTERNOON...NEXT MID LEVEL SHORTWAVE WHICH MODELS SHOW OVER NORTHWEST COLORADO AT 12Z IS EXPECTED TO MOVE ACROSS THE AREA WITH INCREASING LIFT. THIS SHOULD HELP ENHANCE THE ACTIVITY. STEERING WINDS FAIRLY LIGHT...SO STORMS TO CONTINUE TO BE SLOW MOVING. HEAVY RAIN THREAT WITH THE POTENTIAL FOR FLASH FLOODING TO CONTINUE THROUGH THE AFTERNOON. THUNDERSTORM ACTIVITY TO DECREASE DURING THE EVENING AS SLIGHTLY DRIER AND SUBSIDENT AIR MOVES IN FROM THE NORTH. STILL SOME THREAT FOR LOCALLY HEAVY RAIN...THOUGH FLOOD THREAT SHOULD BE DECREASING. BY THURSDAY...FLOW ALOFT BECOMES NORTH NORTHWEST AS SHORTWAVE MOVES SOUTHEAST OF COLORADO. AIRMASS SLIGHTLY DRIER WITH PRECIPITABLE WATER VALUES AROUND AN INCH ACROSS THE PLAINS AND BETWEEN 0.60 AND 0.70 INCHES OVER THE MOUNTAINS. AFTER SOME MORNING LOW LOW CLOUDS AND PERHAPS FOG...THUNDERSTORMS WILL AGAIN BE POSSIBLE WITH THE BEST CHANCE OVER THE HIGHER TERRAIN. BRIEF HEAVY RAIN WILL BE POSSIBLE THOUGH THREAT FOR FLOODING LOOKS LOW. SOME MODERATION IN TEMPERATURES WITH HIGHS IN THE MID AND UPPER 70S ACROSS THE PLAINS. ON FRIDAY...THE NORTH NORTHWEST FLOW ALOFT TO CONTINUE WITH A SLIGHTLY DRIER AIRMASS. STILL SUFFICIENT MOISTURE FOR A CHANCE OF THUNDERSTORMS...MAINLY ACROSS THE MOUNTAINS. MODELS HINT AT A MID LEVEL SHORTWAVE MOVING ACROSS THE AREA DURING THE AFTERNOON WHICH COULD INCREASE THE CHANCES FOR THUNDERSTORMS. HIGHS TO BE A BIT WARMER...WITH READINGS AROUND 80 DEGREES OVER THE PLAINS. FOR THE LATER DAYS...SATURDAY THROUGH MONDAY. NORTHWEST FLOW ALOFT TO PREVAIL THROUGH THE PERIOD. ENOUGH MOISTURE FOR A CHANCE OF AFTERNOON AND EVENING THUNDERSTORMS OVER THE MOUNTAINS AND A SLIGHT CHANCE ACROSS THE PLAINS EACH DAY. BOTH GFS AND ECMWF SHOW SOME INCREASE IN MOISTURE LATE SUNDAY INTO MONDAY WITH HINTS OF A MID LEVEL SHORTWAVE WHICH COULD LEAD TO AN INCREASING CHANCE OF THUNDERSTORMS BY MONDAY. TEMPERATURES TO REMAIN BELOW NORMAL. && .AVIATION...(FOR THE TAFS THROUGH 00Z TUESDAY LATE AFTERNOON) ISSUED AT 343 PM MDT MON JUL 28 2014 SCATTERED TO ISOLATED THUNDERSTORMS ARE EXPECTED ACROSS THE DENVER AREA THROUGH ABOUT 03Z. MAIN THREAT WILL BE HEAVY RAIN AND GUSTY OUTFLOW WINDS TO 40 KNOTS. WIND DIRECTION MAY CHANGE A TIME OR TWO DUE TO OUTFLOWS FROM NEARBY THUNDERSTORMS. THERE WILL BE A CHANCE FOR LOW CLOUDS TUESDAY MORNING...THOUGH DRY AIR COULD PREVENT THIS FROM HAPPENING. THUNDERSTORMS WILL LIKELY AFFECT THE DENVER AIRPORTS TUESDAY AFTERNOON...AFTER 19Z. HEAVY RAIN AND OUTFLOW WIND GUSTS TO 40 KNOTS WILL BE POSSIBLE. && .HYDROLOGY... ISSUED AT 343 PM MDT MON JUL 28 2014 AIRMASS IS MOIST TODAY AND STORMS HAVE BEEN SLOW MOVING WHICH IS LEADING TO A SLIGHT CHANCE OF FLASH FLOODING. FLOOD PRONE AREAS ARE THE AREAS OF CONCERN TODAY. ONLY ISOLATED TO SCATTERED STORMS ARE EXPECTED...SO THE OVERALL THREAT WILL BE LOW. THE THREAT FOR FLASH FLOODING WILL BE MUCH HIGHER TUESDAY AFTERNOON AND THROUGH WEDNESDAY. MOST OF THE BOXES HAVE BEEN CHECKED FOR HEAVY RAIN AND FLOODING TUESDAY AFTERNOON INTO WEDNESDAY. THEY INCLUDE...A VERY MOIST AIRMASS WITH PRECIPITABLE WATER VALUES NEAR THE 99TH PERCENTILE...DEEP WARM CLOUD LAYER OF 8000-9000 FEET...DEEP SKINNY CAPE WITH VALUES LESS THAN 1000 J/KG...AN EASTERLY WIND FLOW UP TO 650 MB WHICH WILL PRODUCE AN UPSLOPE FLOW AND HELP STORMS REGENERATE/TRAIN OVER THE SAME AREA. A FLASH FLOOD WATCH IS IN EFFECT FOR MOST OF NORTHEAST COLORADO TUESDAY AFTERNOON THROUGH MOST OF WEDNESDAY. GRADUAL DRYING STILL EXPECTED THURSDAY INTO THE WEEKEND WITH LESS THUNDERSTORM ACTIVITY. HOWEVER...THERE WILL STILL BE SOME THREAT FOR HEAVY RAINFALL THOUGH THE FLOOD RISK SHOULD BE LOWER. && .BOU WATCHES/WARNINGS/ADVISORIES... FLASH FLOOD WATCH FROM TUESDAY AFTERNOON THROUGH WEDNESDAY AFTERNOON FOR COZ033>047-049. && SHORT TERM...MEIER LONG TERM...D-L AVIATION...MEIER HYDROLOGY...D-L/MEIER
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE DENVER/BOULDER CO 1016 AM MDT MON JUL 28 2014 COZ030>051-291630- 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- 1016 AM MDT MON JUL 28 2014 ...HEAVY RAIN POSSIBLE TUESDAY AFTERNOON THROUGH WEDNESDAY... THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST AND NORTH CENTRAL COLORADO. .DAY ONE...TODAY AND TONIGHT SCATTERED THUNDERSTORMS WITH LOCALLY HEAVY RAINFALL WILL DEVELOP ACROSS THE AREA AGAIN TODAY. STORMS WILL FIRST DEVELOP OVER THE MOUNTAINS AND FOOTHILLS LATE THIS MORNING AND BECOME MORE WIDESPREAD DURING THE AFTERNOON. ON THE PLAINS...ISOLATED TO SCATTERED STORMS ARE EXPECTED TO DEVELOP BY MID TO LATE AFTERNOON. SOME STORMS WILL BE CAPABLE OF PRODUCING ONE INCH OF RAIN IN 20 TO 30 MINUTES. THE STRONGER OR SLOW MOVING STORMS MAY PRODUCE 2 INCHES OF RAIN IN AN HOUR OR LESS. THESE STORMS MAY PRODUCE SOME FLOODING...ESPECIALLY IN BURN SCARS OR URBAN AREAS. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY SHOWERS AND THUNDERSTORMS WILL BECOME NUMEROUS TUESDAY AFTERNOON AND CONTINUE MUCH OF WEDNESDAY. AREAS OF HEAVY RAIN ARE EXPECTED...WITH POTENTIAL FOR FLASH FLOODING. THE EXACT LOCATION AND TIMING OF THE HEAVIEST RAIN IS UNCERTAIN...BUT A LARGE AREA COULD RECEIVE OVER AN INCH OF RAIN WITH LOCALIZED AMOUNTS OF SEVERAL INCHES WHERE SLOW MOVING THUNDERSTORMS DEVELOP. THE GREATEST THREAT APPEARS TO BE IN THE FOOTHILLS AND ADJACENT PLAINS FROM NEAR CHEYENNE SOUTH TO PUEBLO. FROM THURSDAY INTO THE WEEKEND...SLIGHTLY WARMER AND DRIER CONDITIONS CAN BE EXPECTED...THOUGH TEMPERATURES WILL STILL BE BELOW NORMAL. THE CHANCES FOR THUNDERSTORMS WILL BE ON THE DECREASE. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY OR TONIGHT. HOWEVER...ANY REPORTS OF HEAVY RAINFALL WOULD BE APPRECIATED.
The Denver radar (KFTG), 37 km away, was scanning. The volume nearest the first event began at 21:54 UTC.
2 tornado, 1 thunderstorm wind. Local standard time, as filed.
A tornado touched down briefly in an open field; no damage was observed.
A tornado touched down briefly on the southwest part of the Rocky Mountain Arsenal Wildlife Refuge. No damage was reported.
Thunderstorm winds capsized a small boat. All three occupants made it to shore with no injuries.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Colorado in 2014Every state in 2014This day in weather historyThe tornado archive for Colorado, 2014Warnings in Colorado, July 2014
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: 531643, 531642, 531644.