A line of strong thunderstorms moved through the eastern Grand Valley and produced wind gusts over 60 mph.
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The episode as NWS GJT wrote it up.
A line of strong thunderstorms moved through the eastern Grand Valley and produced wind gusts over 60 mph.
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 Jul 11, 1:59 PM MST, 3 hours 46 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GRAND JUNCTION CO 259 PM MDT SUN JUL 11 2010 .SHORT TERM...TODAY THROUGH WEDNESDAY... CONVECTION HAS ALREADY FORMED OVER MUCH OF CWA DUE TO SHORT WAVES MOVING OVER REGION AHEAD OF UPPER LEVEL TROUGH. AS EXPECTED...MOST CONVECTION FORMING OVER HIGHER TERRAIN...ESPECIALLY ROAN/TAVAPUTS PLATEAU...WITH SOME HEAVIER RAINSHOWERS...SMALL HAIL...AND GUSTY WIDENS POSSIBLE. UPPER LEVEL TROUGH...HIGHLIGHTED BY POTENTIAL VORTICITY...WILL INCREASE STORM STRENGTH AND COVERAGE LATER THIS EVENING AS TROUGH AXIS ENTERS FORECAST AREA OVER NERN UT AND SLOWLY DROPS SOUTHEASTWARD UNTIL IT COMPLETELY EXITS SWRN CO BY 6AM. BY MONDAY...NWLY FLOW THROUGH 20K FT WILL USHER IN MUCH DENSER AIR AND CAUSE CONSTANT INFLOW OF MOISTURE FROM SUB-TROPICS TO BE CUTOFF. EXPECT PLENTY OF SUNSHINE MONDAY WITH HOT TEMPS ACROSS CWA. FLOW BECOMES MORE ZONAL TUESDAY INTO WEDNESDAY WITH CHANCES INCREASING FOR CONVECTION OVER SAN JUANS. KEPT POPS/WX SLGT CHC OVER HIGHEST PEAKS OF SAN JUANS TUE EVENING WITH REMAINING AREAS SEEING MOSTLY SUNNY SKIES AND WARMING TEMPS. PREVIOUS MODEL RUNS INDICATED SOMEWHAT COOLER TEMPS WITH TROUGH PASSAGE BUT LATEST STATISTICAL GUIDANCE SHOWS ALMOST NO CHANGE. THICKNESS SHOWS THERMAL PACKING BEING SHEARED OUT AS TROUGH PASSES THRU WY SO NOT MUCH TEMPERATURE MODIFICATION FOR US. IN THAT REGARD...BUMPED UP TEMPS THROUGH SHORT TERM REACHING UPPER 90S BY WEDNESDAY. .LONG TERM...THURSDAY THROUGH SUNDAY... HOT WITH DIMINISHED SHOWER ACTIVITY IS THE TREND THROUGH THESE PERIODS. A BROAD AREA OF HIGH PRESSURE...UP TO 598DAM...BUILDS WEST OF THE FOUR CORNERS AND PARKS THERE THROUGH THESE PERIODS. SUBTROPICAL MOISTURE WORKS INTO THE SOUTH BUT NW FLOW ACROSS THE NORTH LIMITS AVAILABLE MOISTURE THERE. THE AMOUNT OF AVAILABLE INSTABILITY WILL BE MARGINAL...ENHANCED BY STRONG SURFACE HEATING YET DIMINISHED BY MID-LEVEL SUBSIDENCE. MODELS DO NOT SHOW A CLEAR TREND FOR ORGANIZED FORCING THIS FAR OUT. OTHERWISE TEMPERATURES WILL SOAR FOR PERHAPS THE WARMEST WEEK OF THE SEASON...INTO THE TRIPLE DIGITS FOR THE LOWER ELEVATIONS. THESE WARM CONDITIONS PRODUCE A LOCAL THERMAL LOW USUALLY NOT RESOLVED BY SYNOPTIC MODELS. THEREFORE EXPECT MONSOONAL MOISTURE TO BE INGESTED INTO THE HIGH CENTER... AND LATE-DAY STORMS TO BE MORE PREVALENT THAN CURRENTLY PROGGED. FAVORED LOCATION FOR THE HEAVIEST SHOWERS WILL BE THE SOUTHERN MOUNTAINS WHERE STORM MOTION WILL BE SLOW NEAR THE HIGH CENTER. && .AVIATION... THUNDERSTORMS ALREADY BEEN REPORTED AT KVEL...KEGE...AND KASE AND EXPECT DEVELOPMENT TO CONTINUE WITH CHANCES FOR TSTORMS FOR ALL TAF SITES THROUGH EARLY EVENING. MAIN CONCERN WILL BE BRIEF GUSTY WINDS UP TO 50 MPH AND BRIEF HEAVY RAIN. VFR CONDITIONS EXPECTED FROM MONDAY MORNING AND BEYOND. && .GJT WATCHES/WARNINGS/ADVISORIES... CO...NONE UT...NONE SHORT TERM.....TGR LONG TERM......JOE AVIATION.......TGR
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GRAND JUNCTION CO 600 AM MDT SUN JUL 11 2010 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 SUN JUL 11 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN UTAH AND WESTERN COLORADO. .DAY ONE...TODAY AND TONIGHT EXPECT SCATTERED THUNDERSTORMS FROM LATE MORNING THROUGH EARLY EVENING ACROSS MUCH OF COLORADO AND UTAH. ISOLATED STRONGER STORMS PRODUCE BRIEF HEAVY RAIN AND SMALL HAIL...BUT GUSTY WINDS UP TO THE 40 TO 50 MPH RANGE WILL BE THE PRIMARY THREAT. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY DRY WEATHER IS EXPECTED ON MONDAY...BUT ISOLATED TO SCATTERED THUNDERSTORMS WILL BE POSSIBLE OVER THE MOUNTAINS EACH AFTERNOON FOR THE REMAINDER OF THE WEEK. MOST OF THESE STORMS WILL NOT PRODUCE MUCH RAINFALL. .SPOTTER INFORMATION STATEMENT SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY OR TONIGHT.
The Grand Junction radar (KGJX), 29 km away, was scanning. The volume nearest the first event began at 00:45 UTC.
1 thunderstorm wind. Local standard time, as filed.
Wind gusts to 61 mph were measured at the Grand Junction Regional Airport.
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, July 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: 351637.