A thunderstorm produced destructive outflow winds near Colona on the afternoon of May 28th.
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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 GJT wrote it up.
A thunderstorm produced destructive outflow winds near Colona on the afternoon of May 28th.
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 Grand Junction, CO wrote its last area forecast discussion before the first event at May 28, 2:30 PM MST, 2 hours 40 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GRAND JUNCTION CO 330 PM MDT TUE MAY 28 2013 .SHORT TERM...(THIS EVENING THROUGH WEDNESDAY NIGHT) ISSUED AT 330 PM MDT TUE MAY 28 2013 SHOWERS WILL CONTINUE TO INCREASE THIS EVENING FROM THE NORTHWEST AS A COLD FRONT MOVES INTO THE AREA. THIS FRONT WILL MAKE IT INTO NORTHWEST CO AND EAST CENTRAL UT LATE THIS AFTERNOON TO EARLY THIS EVENING...THEN SWEEP OVER ALL BUT THE FAR SOUTHEAST CORNER BY MIDNIGHT TONIGHT. AT 300 PM...THE LIGHTNING ASSOCIATED WITH THIS DISTURBANCE WAS STILL UPSTREAM...AS THE THICKER MID AND HIGH LEVEL CLOUDS SEEM TO HAVE HAD A DETERRENT EFFECT. BUT THUNDER SHOULD DEVELOP BY LATE THIS AFTERNOON OVER OUR AREA AS WELL. LIGHTNING WILL DIMINISH AFTER FRONTAL PASSAGE...WITH MOST ENDING BY MIDNIGHT. THIS TIMING IS SUPPORTED BY AN IN-HOUSE LIGHTNING POTENTIAL INDEX...AND FORECAST SOUNDINGS. ALSO ASSOCIATED WITH/AND FOLLOWING CLOSELY BEHIND THE FRONT IS AN UPPER LEVEL TROUGH. THE TROUGH AXIS LOOKS LIKE IT WILL REACH THE CO/UT BORDER AROUND 09Z WED...THEN JUST EAST OF THE CONTINENTAL DIVIDE BY 15Z. THE UPPER TROUGH WILL ALLOW SHOWERS TO CONTINUE LATE TONIGHT AND INTO WED MORNING. THEN INSTABILITY WILL INCREASE DURING THE AFTERNOON DUE TO THE DIURNAL INFLUENCE. THEREFORE AFTER A LULL DURING THE MORNING...EXPECT SHOWERS/THUNDERSTORMS TO INCREASE AGAIN DURING THE AFTERNOON. THE NORTH WILL REMAIN FAVORED AS THE DEEPEST MOISTURE WILL BE OVER THAT AREA. ALSO THE TROUGH ONLY BRUSHES THE SOUTHERN EDGE WITH ITS BEST ENERGY TO OUR NORTH. ANOTHER WEAK DISTURBANCE EMBEDDED IN THE NORTHWEST FLOW THU NIGHT WILL KEEP THE CHANCE OF SHOWERS ONGOING WED NIGHT...MAINLY NORTH. TEMPERATURES WILL DROP TONIGHT IN THE WAKE OF THE COLD FRONT AND THEN REMAIN BELOW NORMAL THROUGH THE NEXT FEW DAYS. OVERNIGHT LOWS...WILL DROP SEVERAL DEGREES AS COMPARED TO THIS MORNINGS...WITH ANOTHER COUPLE DEGREES OF COOLING FOR THURSDAY NIGHT. HIGHS ON WED WILL BE NEARLY 10 DEGREES BELOW NORMAL. .LONG TERM...(THURSDAY THROUGH TUESDAY) ISSUED AT 330 PM MDT TUE MAY 28 2013 MODELS AGREE ON LIFTING THE JET GRADUALLY TO THE NORTH THURSDAY FOR A LESSER CHANCE OF SHOWERS AS DRIER AIR GETS ENTRAINED ACROSS SE UT AND SW CO. THURSDAY LOOKS BREEZY WITH AFTERNOON TEMPERATURES COOLER THAN NORMAL. A POSITIVELY TILTED TROUGH WILL CUT ACROSS COLORADO ON FRIDAY...BUT MUCH OF THE MOISTURE WILL STAY EAST OF THE DIVIDE. SHOWER POTENTIAL IS NOT GREAT AND WILL BE LIMITED TO THE HIGH COUNTRY ALONG THE NRN DIVIDE. TEMPERATURES WILL REMAIN WELL BELOW NORMAL UNTIL LATE WEEKEND WHEN HIGH PRESSURE BEGINS TO BUILD BACK INTO THE AREA. BY SUNDAY...SOUTHWEST FLOW REDEVELOPS AND TEMPS WILL JUMP BACK INTO THE MID TO UPPER 80S THROUGH THE VALLEY REGIONS...AND SEASONABLE AS WELL FOR HIGHER ELEVATIONS. && .AVIATION...(FOR THE 00Z TAFS THROUGH 00Z WEDNESDAY EVENING) ISSUED AT 330 PM MDT TUE MAY 28 2013 SHOWERS WILL CONTINUE TO SPREAD IN FROM THE NORTHWEST EARLY THIS EVENING...WITH THE CHANCE FOR THUNDERSTORMS PEAKING AROUND MID-EVENING...THEN MOSTLY ENDING BY MIDNIGHT. LIGHT TO MODERATE MECHANICAL TURBULENCE MAY PERSIST UNTIL AROUND 03Z DUE TO OCCASIONAL SURFACE GUSTS OF 25-35 KTS. VFR IS EXPECTED TO BE MAINTAINED AT ALL TAF SITES...ALTHOUGH IFR MAY OCCUR AT KASE/KEGE AIRPORTS WITH PASSING SHOWERS OR THUNDERSTORMS. AREAS OF MOUNTAIN OBSCURATIONS WILL BE EXPECTED IN SHOWERS THROUGH WEDNESDAY AFTERNOON...WITH SNOW ABOVE 8000-9000 FEET LATE TONIGHT AND EARLY WEDNESDAY MORNING. && .FIRE WEATHER... ISSUED AT 330 PM MDT TUE MAY 28 2013 RED FLAG WARNING FOR CO FIRE WX ZONE 207 UNTIL 7 PM THIS EVENING...FOR GUSTY WINDS AND LOW HUMIDITY AHEAD OF COLD FRONT. THE ASSOCIATED COLD FRONT IS CURRENTLY TIMED TO REACH SW COLORADO THIS EVENING. INITIALLY STORMS WILL BE HIGH BASED WITH LITTLE RAIN. BUT THEY WILL PRODUCE STRONG AND ERRATIC WINDS. BY MID- EVENING HUMIDITY LEVELS WILL BEGIN TO INCREASE AS THE FRONT APPROACHES...AND THE CHANCE FOR WETTING RAIN WILL INCREASE. THE FLOW WILL AGAIN INCREASE ON THURSDAY OVER SOUTHWEST COLORADO...WITH THE POTENTIAL FOR LOCALIZED FIRE WEATHER CONCERNS FOR A SHORT TIME DURING THE AFTERNOON. COOLER THAN NORMAL TEMPERATURES WILL PERSIST THROUGH THE WEEK. && .GJT WATCHES/WARNINGS/ADVISORIES... CO...RED FLAG WARNING UNTIL 7 PM MDT THIS EVENING FOR COZ207. UT...NONE. && SHORT TERM...EH LONG TERM...TGJT AVIATION...EH FIRE WEATHER...JAM
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GRAND JUNCTION CO 658 AM MDT TUE MAY 28 2013 COZ001>014-017>023-UTZ022>025-027>029-291300- LOWER YAMPA RIVER BASIN-CENTRAL YAMPA RIVER BASIN- ROAN AND TAVAPUTS PLATEAUS-ELKHEAD AND PARK MOUNTAINS- UPPER YAMPA RIVER BASIN-GRAND VALLEY-DEBEQUE TO SILT CORRIDOR- CENTRAL COLORADO RIVER BASIN-GRAND AND BATTLEMENT MESAS- GORE AND ELK MOUNTAINS/CENTRAL MOUNTAIN VALLEYS- CENTRAL GUNNISON AND UNCOMPAHGRE RIVER BASIN- WEST ELK AND SAWATCH MOUNTAINS-FLATTOPS- UPPER GUNNISON RIVER VALLEY-UNCOMPAHGRE PLATEAU AND DALLAS DIVIDE- NORTHWEST SAN JUAN MOUNTAINS-SOUTHWEST SAN JUAN MOUNTAINS- PARADOX VALLEY/LOWER DOLORES RIVER- FOUR CORNERS/UPPER DOLORES RIVER-ANIMAS RIVER BASIN- SAN JUAN RIVER BASIN-SOUTHEAST UTAH-EASTERN UINTA MOUNTAINS- EASTERN UINTA BASIN-TAVAPUTS PLATEAU-ARCHES/GRAND FLAT- LA SAL AND ABAJO MOUNTAINS-CANYONLANDS/NATURAL BRIDGES- 658 AM MDT TUE MAY 28 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN UTAH AND WESTERN COLORADO. .DAY ONE...TODAY AND TONIGHT CRITICAL FIRE WEATHER CONDITIONS EXIST FOR ELEVATIONS BELOW 8500 FEET AS GUSTY WINDS...LOW HUMIDITY...AND DRY FUELS EXIST ACROSS EXTREME SOUTHWEST COLORADO. SHOWERS WITH A FEW THUNDERSTORMS WILL DEVELOP ACROSS NORTHEAST UTAH AND NORTHWEST COLORADO TODAY...SPREADING INTO SOUTHEAST UTAH AND SOUTHWEST COLORADO LATE THIS AFTERNOON AND EVENING. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY WEDNESDAY AND THURSDAY...COOLER WITH SHOWERS AND THUNDERSTORMS EXPECTED ON WEDNESDAY...BUT DECREASES ON THURSDAY AND LIMITED TOWARD THE CONTINENTAL DIVIDE. LIGHT SNOW OVER THE MOUNTAIN PASSES WILL BE POSSIBLE DURING THE NIGHTTIME AND MORNING HOURS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED.
The Grand Junction radar (KGJX), 90 km away, was scanning. The volume nearest the first event began at 00:08 UTC.
1 thunderstorm wind. Local standard time, as filed.
A mobile home was rolled a few times and destroyed by severe thunderstorm outflow winds. A pole barn also lost part of it's roof. No injuries were reported.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Colorado in 2013Every state in 2013This day in weather historyWarnings in Colorado, May 2013
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: 495452.