Strong thunderstorm outflow winds struck an area near Mack.
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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.
Strong thunderstorm outflow winds struck an area near Mack.
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 11, 2:46 PM MST, 1 hour 52 minutes earlier.
AREA FORECAST DISCUSSION...UPDATED NATIONAL WEATHER SERVICE GRAND JUNCTION CO 346 PM MDT THU JUN 11 2009 .SHORT TERM...TONIGHT THROUGH SATURDAY... UPPER LEVEL WAVE WILL EJECT TO THE NORTHEAST AND OVERHEAD THIS EVENING AND EXIT LATER TONIGHT. SLIGHTLY DRIER AND MORE STABLE AIRMASS ALONG THE SOUTHERN EDGE OF THE TROUGH HAS HELPED TO REDUCE CLOUD COVER AND SHOWER DEVELOPMENT. KEPT THE TREND OF REDUCED POPS THIS EVENING OVER THE SOUTHWESTERN PORTION OF THE CWA AND FURTHER REDUCING POPS SOUTHWEST TO NORTHEAST AFTER MIDNIGHT. A WEAK RIDGE BUILDS OVER THE REGION FRIDAY AS THE LOW DIGS DEEPER ALONG THE CA COAST. MODEL PW VALUES DECREASE TO NEAR HALF AN INCH FRIDAY AND SATURDAY. SURFACE HEATING AND OROGRAPHICS WILL PLAY THE BEST ROLE IN CONVECTION. THE TROUGH WILL MOVE INLAND WITH THE CORE OVER NORTHERN CA HELPING TO TIGHTEN THE GRADIENT INCREASING THE WINDS ALOFT ON SATURDAY. MOISTURE WILL AGAIN START TO INCREASE UNDER THE SOUTHWESTERLY FLOW. A FEW WEAK DISTURBANCES MOVE THROUGH THE FLOW IN SATURDAY WITH THE RIDGE AXIS EAST OF THE DIVIDE EXPECT SHOWERS WILL INCREASE IN COVERAGE ESPECIALLY NORTH. IN ADDITION A DISTURBANCE ROTATES AROUND THE LOW AND INTO UTAH LATE SATURDAY. TEMPERATURES WILL REMAIN BELOW SEASONAL NORMALS DUE TO PRECIPITATION AND CLOUD COVER...ALTHOUGH WARMING WILL OCCUR THROUGH THE WEEKEND. .LONG TERM...SATURDAY NIGHT THROUGH THURSDAY... MODELS IN GOOD AGREEMENT THROUGH THE PERIOD WITH UNSETTLED PATTERN TO CONTINUE...OVERALL MADE FEW CHANGES TO INHERITED GRIDS. UPPER LOW NEAR NRN CA SHIFTS EWRD INTO THE NORTHERN GRT BASIN SUNDAY THEN INTO THE UPPER PLAINS STATES MONDAY. AS SUCH THIS KEEPS MODERATE MOISTURE (4G/KG) OVER THE REGION IN COMBINATION WITH EJECTING VORT LOBES PROVIDING DYNAMIC LIFT. THE DEEPEST MOISTURE AND MOST OF THE ACTIVITY WILL BE OVER THE NORTH. PERSISTENT UPPER LOW THEN REDEVELOPS OVER SRN CA TUESDAY PROVIDING A SWRLY FLOW WITH ENOUGH MOISTURE AND INSTABILITY FOR SCATTERED MOUNTAIN SHOWERS AND THUNDERSTORMS. LITTLE CHANGE IS EXPECTED WEDNESDAY. CURRENT EC AND GFS SHOWS DRYING THURSDAY AS HIGH PRESSURE RETROGRADES EWRD FROM TX. BUT CONFIDENCE NOT THAT HIGH AS UPPER LOW LINGERS OFF THE SRN CA COAST. && .AVIATION... SCATTERED TO NUMEROUS CLOUDS...SHOWERS...AND THUNDERSTORMS ARE EXPECTED TO CONTINUE ACROSS THE AREA THROUGH THIS EVENING AS MOISTURE CONTINUES TO STREAM ACROSS THE REGION. EXPECT LOCAL AREAS OF MVFR CEILINGS AND VISIBILITIES IN HEAVIER SHOWERS AND THUNDERSTORMS. THE OCCURRENCE OF THUNDERSTORMS WILL PEAK DURING THE LATE AFTERNOON AND EARLY EVENING HOURS. SHOWER AND THUNDERSTORM COVERAGE WILL DECREASE OVERNIGHT INTO FRIDAY. && .GJT WATCHES/WARNINGS/ADVISORIES... .CO...NONE. .UT...NONE. SHORT TERM..... LONG TERM......MC AVIATION.......TGJT
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GRAND JUNCTION CO 600 AM MDT THU JUN 11 2009 COZ001>014-017>023-UTZ022>025-027>029-121200- 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- 600 AM MDT THU JUN 11 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN UTAH AND WESTERN COLORADO. .DAY ONE...TODAY AND TONIGHT... EXPECT SCATTERED SHOWERS AND THUNDERSTORMS ACROSS THE REGION TODAY. STORMS WILL BE CAPABLE OF PRODUCING BRIEF HEAVY RAIN...PEA SIZED SMALL HAIL AND DANGEROUS LIGHTNING. LIGHT SNOW ABOVE 9500 FEET WILL BE POSSIBLE THIS MORNING. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY... ISOLATED TO SCATTERED SHOWERS AND THUNDERSTORMS...MAINLY IN THE AFTERNOON...CONTINUE INTO NEXT WEEK. THE STRONGER STORMS WILL PRODUCE HAIL...GUSTY WINDS...AND BRIEF HEAVY RAINFALL. LIGHT SNOWFALL IS POSSIBLE IN THE HIGHER MOUNTAINS ABOVE 10000 FEET. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY OR TONIGHT. PF/JOE
The Grand Junction radar (KGJX), 66 km away, was scanning. The volume nearest the first event began at 23:39 UTC.
1 thunderstorm wind. Local standard time, as filed.
Strong thunderstorm outflow winds blew down a number of items at a volunteer spotter's residence.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Colorado in 2009Every state in 2009This day in weather historyWarnings in Colorado, June 2009
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: 180858.