Strong to severe thunderstorms developed over eastern Utah and western Colorado, which produced large hail and minor flooding.
Every event with a place to put it. Tap one for its entry below.
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.
Strong to severe thunderstorms developed over eastern Utah and western Colorado, which produced large hail and minor flooding.
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 Jun 12, 2:00 PM MST, 12 hours 35 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GRAND JUNCTION CO 300 PM MDT SAT JUN 12 2010 .SHORT TERM...TONIGHT THROUGH MONDAY... STRONG CLOSED LOW CIRCULATION CENTERED OVER THE LOWER COLORADO RIVER BASIN TRIGGERING WIDESPREAD CONVECTION ACROSS THE COUNTY WARNING AREA TODAY. THE COMBINATION OF THE BAROCLINIC ZONE CROSSING THE WESTERN SLOPE TODAY AND THE JET CORE ROUNDING THE BASE OF THE TROUGH CAUSING STRONG UPWARDS MOTION. WIDESPREAD SHOWERS HAVE STABILIZED THE AIR MASS ACROSS NWRN COLORADO...BUT SE UTAH AND EXTREME SW COLORADO AND UPSTREAM AREAS LIKE NRN ARIZONA HAS HAD MORE SURFACE HEATING AND EXPECT SOME STRONG CELLS TO FORM. MARGINAL SEVERE STORMS WILL BE POSSIBLE GIVEN THE CURRENT SHEAR. EARLIER SEVERE STORM THAT DEVELOPED OVER OURAY COUNTY AND TRACKED ACROSS MONTROSE AND ERN DELTA COUNTY SHOWED PRONOUNCED OVERHANGING TOP...BUT THE STORM HEIGHT WAS RELATIVELY LOW INDICATING THAT STORMS ARE LOW TOPPED. SNOW LEVELS TO DROP AROUND 8000 FEET OVERNIGHT BUT ACCUMULATIONS WILL BE SPOTTY AS SHOWERS TAPER OFF. SOME MOUNTAIN PASSES WILL BECOME SLIPPERY AS SOME SLUSH FORMS ON THE HIGHWAYS. WILL ADDRESS THIS WITH A SPECIAL WEATHER STATEMENT...BUT THIS WILL NEED TO MONITOR FOR POSSIBLE LATE SEASON WINTER WEATHER ADVISORY. CLOSED UPPER LOW WEAKENS AS IT EJECTS ACROSS NE UTAH ON SUNDAY AND THE STRONGER GRADIENT FLOW WILL HAVE SHIFTED EAST OF THE DIVIDE. EXPECT LOW TOP CONVECTION TO FOLLOW THE CLOSED LOW AND EXPECT NUMEROUS SHOWERS NORTH OF I70. SEVERE STORMS NOT EXPECTED GIVEN THE LACK OF SHEAR...BUT CANNOT BE COMPLETELY RULED OUT. MONDAY...THE MAIN CLOSED LOW WILL HAVE REFORMED OVER THE DAKOTA STATES. THE GFS SHOWS A SECONDARY VORT CENTER SWINGING THROUGH THE WESTERN SLOPE MONDAY MORNING...ASSOCIATED WITH THE POSITIVELY TILTED TROUGH AXIS. THIS FEATURE COULD TRIGGER ADDITIONAL SHOWERS...BUT EXPECT DRYING TREND ONCE THE TROUGH AXIS MOVES EAST. THE MODELS HINT THAT THE TROUGH MAY BE SLOW TO DRAG ACROSS WRN COLORADO...SO HAVE BOOSTED POPS TO CHANCE ACROSS THE WESTERN SLOPE MOUNTAINS. .LONG-TERM...MONDAY NIGHT THROUGH SATURDAY... MEAN LONG WAVE TROUGH EXPECTED TO HOLD ALONG THE WEST COAST THROUGH THIS PERIOD. THIS WILL KEEP ERN UT AND WRN CO UNDER SOUTHWEST AND GENERALLY DRY FLOW ALOFT. GFS AND ECWMF APPEAR TO BE COMING INTO BETTER TIMING AGREEMENT ON LIFTING A SHORTWAVE TROUGH OUT OF THE GREAT BASIN AND ACROSS THE NORTHERN ROCKIES...WITH THE SRN EXTENT OF THE TROUGH SWEEPING ACROSS NE UT/NW CO ABOUT THURSDAY. MODELS KEEP MOISTURE CONCENTRATED NEAR THE LOW CENTER AND SPARSE OVER OUR AREA ...SO WILL KEEP THE CURRENT SLIGHT CHANCE OF THUNDERSTORMS FOR THE MTNS WED-THU. MAY SEE SOME SMALL EMBEDDED DISTURBANCES IN THE SW FLOW FOR NEXT WEEKEND AS ANOTHER TROUGH DROPS DOWN OVER THE PAC NW. TEMPERATURES SHOULD AVERAGE NEAR NORMAL. && .AVIATION... WIDESPREAD SHOWERS WITH SCATTERED THUNDERSTORMS WILL BLANKET MUCH OF WESTERN COLORADO AND EASTERN UTAH THROUGH EARLY SUNDAY. EXPECT WIDESPREAD MVFR CIGS TODAY AND TONIGHT...ESPECIALLY OVER THE MOUNTAINS WITH LOCAL IFR CONDITIONS POSSIBLE NEAR THE STRONGER SHOWERS AND THUNDERSTORMS. SNOW LEVELS WILL TEMPORARILY FALL TO 8000 FEET BETWEEN 06Z-15Z LATE TONIGHT AND EARLY SUNDAY MORNING. && .HYDROLOGY... FLOWS CONTINUED TO GRADUALLY DECREASE ALONG MANY OF THE HEADWATER STREAMS AND CREEKS IN NORTH-CENTRAL COLORADO AND NORTHEASTERN UTAH. THE RETURN OF COOLER TEMPERATURES COMBINED WITH THE DEPLETION OF SNOWPACK IN THE MOUNTAINS OF NORTHEASTERN UTAH AND NORTH-CENTRAL COLORADO WILL RESULT IN DECREASED FLOWS AND LOWERING RIVER LEVELS. HOWEVER...THE ONGOING POTENTIAL FOR SHOWERS IN THE COLORADO RIVER HEADWATERS REGION AND THE YAMPA RIVER HEADWATERS REGION IS BEING CLOSELY MONITORED. RECREATIONALISTS SHOULD USE CAUTION WHEN BOATING AND RAFTING IN THE COLD...FAST FLOWING RIVER WATERS. LARGE QUANTITIES OF DEBRIS HAVE BEEN OBSERVED IN MANY RIVERS. ALSO...THE HIGH WATERS CAN QUICKLY ERODE RIVER BANKS MAKING THEM UNSTABLE TO WALK ON OR NEAR. && .GJT WATCHES/WARNINGS/ADVISORIES... .CO....NONE. .UT....NONE. SHORT TERM.....PF LONG TERM......JAD AVIATION.......TGJT HYDROLOGY......TGJT
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GRAND JUNCTION CO 550 AM MDT SAT JUN 12 2010 COZ001>014-017>023-UTZ022>025-027>029-131145- ANIMAS RIVER BASIN-ARCHES/GRAND FLAT-CANYONLANDS/NATURAL BRIDGES- CENTRAL COLORADO RIVER BASIN- CENTRAL GUNNISON AND UNCOMPAHGRE RIVER BASIN- CENTRAL YAMPA RIVER BASIN-DEBEQUE TO SILT CORRIDOR- EASTERN UINTA BASIN-EASTERN UINTA MOUNTAINS- ELKHEAD AND PARK MOUNTAINS-FLAT TOPS- FOUR CORNERS/UPPER DOLORES RIVER- GORE AND ELK MOUNTAINS/CENTRAL MOUNTAINS-GRAND AND BATTLEMENT MESAS- GRAND VALLEY-LA SAL AND ABAJO MOUNTAINS-LOWER YAMPA RIVER BASIN- NORTHWEST SAN JUAN MOUNTAINS-PARADOX VALLEY/LOWER DOLORES RIVER- ROAN AND TAVAPUTS PLATEAUS-SAN JUAN RIVER BASIN-SOUTHEAST UTAH- SOUTHWEST SAN JUAN MOUNTAINS-TAVAPUTS PLATEAU- UNCOMPAHGRE PLATEAU AND DALLAS DIVIDE-UPPER GUNNISON RIVER VALLEY- UPPER YAMPA RIVER BASIN-WEST ELK AND SAWATCH MOUNTAINS- 550 AM MDT SAT JUN 12 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN UTAH AND WESTERN COLORADO. .DAY ONE...TODAY AND TONIGHT NUMEROUS SHOWERS AND THUNDERSTORMS WILL OCCUR ACROSS WESTERN COLORADO AND EASTERN UTAH THROUGH TONIGHT. GUSTY WINDS TO NEAR 50 MPH...HAIL UP TO ONE INCH IN DIAMETER AND HEAVY RAIN WILL ACCOMPANY THE STRONGEST STORMS. MANY CREEKS...STREAMS AND RIVERS ACROSS WESTERN COLORADO AND NORTHEAST UTAH WILL CONTINUE TO RUN FAST AND HIGH...WITH SEVERAL RUNNING NEAR BANKFULL THROUGH TONIGHT. PLEASE VISIT THE NATIONAL WEATHER SERVICE GRAND JUNCTION WEBSITE AT WEATHER.GOV/GJT FOR THE LATEST WEATHER INFORMATION. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY THE CHANCE FOR THUNDERSTORMS WILL CONTINUE THROUGH SUNDAY AND OVER THE NORTH ON MONDAY. DRIER CONDITIONS ARE THEN EXPECTED FOR REMAINDER OF THE WEEK. RIVERS ARE EXPECTED TO SLOWLY DECREASE INTO EARLY NEXT WEEK AS TEMPERATURES REMAIN BELOW NORMAL THROUGH TUESDAY. .SPOTTER INFORMATION STATEMENT SPOTTER ACTIVATION MAY BE NEEDED TODAY DUE TO STRONG THUNDERSTORMS. TGJT
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GRAND JUNCTION CO 1128 PM MDT SAT JUN 12 2010 COZ004-009-010-012-013-018-019-UTZ023-131200- ELKHEAD AND PARK MOUNTAINS-GRAND AND BATTLEMENT MESAS- GORE AND ELK MOUNTAINS/CENTRAL MOUNTAIN VALLEYS- WEST ELK AND SAWATCH MOUNTAINS-FLATTOPS- NORTHWEST SAN JUAN MOUNTAINS-SOUTHWEST SAN JUAN MOUNTAINS- EASTERN UINTA MOUNTAINS- INCLUDING THE CITIES OF...COLUMBINE...TOPONAS...SKYWAY...ASPEN... VAIL...SNOWMASS...CRESTED BUTTE...TAYLOR PARK...MARBLE...BUFORD... TRAPPERS LAKE...OURAY...TELLURIDE...LAKE CITY...SILVERTON... RICO...HESPERUS...MANILA...DUTCH JOHN 1128 PM MDT SAT JUN 12 2010 ...LIGHT SNOW ACCUMULATIONS EXPECTED OVER THE HIGH MOUNTAIN PASSES... SNOW LEVELS WILL FALL TO AROUND 8000 FEET OVERNIGHT WITH SOME ACCUMULATIONS ABOVE THIS LEVEL. WHILE SNOW ACCUMULATIONS WILL BE LIGHT...GENERALLY LESS THAN 2 INCHES...THIS WILL BE ENOUGH SNOW TO MAKE ROADWAYS SLUSHY AND WILL CREATE SLIPPERY ROAD CONDITIONS. PEOPLE TRAVELING TO THE HIGH COUNTRY SHOULD BE PREPARED FOR SUDDEN CHANGES IN THE WEATHER AND EXPECT SNOW AND SLICK ROADS. THE THREAT OF SNOW SHOWERS CONTINUES THROUGH SUNDAY NIGHT. SNOW ACCUMULATIONS WILL BE SPOTTY...BUT ANY TRAVELERS OR OUTDOOR RECREATIONALISTS SHOULD BE PREPARED FOR COLD WET WEATHER AND SNOW ABOVE 10000 FEET.
The Grand Junction radar (KGJX), 190 km away, was scanning. The volume nearest the first event began at 09:34 UTC.
1 heavy rain, 1 hail. Local standard time, as filed.
Showers and thunderstorms produced over one inch of rain across portions of Routt County, which lead to some minor flooding along the Elk River near Milner.
Hail up to the size of quarters pummelled Colorado National Monument.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Colorado in 2010Every state in 2010This day in weather historyWarnings in Colorado, June 2010
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: 256860, 256858.