A thunderstorm produced damaging winds in Grand Junction.
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The episode as NWS GJT wrote it up.
A thunderstorm produced damaging winds in Grand Junction.
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 15, 1:46 PM MST, 3 hours 44 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GRAND JUNCTION CO 246 PM MDT SUN JUL 15 2007 .SHORT TERM (TONIGHT THROUGH TUESDAY)... A SMALL AMOUNT OF MID-LEVEL MOISTURE FILTERED INTO THE GREAT BASIN RIDGE AND THUNDERSTORMS INCREASED A KNOTCH THIS AFTERNOON. WIND SPEEDS ALOFT HAVE WEAKENED AND THERE IS LITTLE OR NO DIRECTION SHEAR SO ONLY WEAK STORMS ARE EXPECTED THIS EVENING WITH LITTLE RAIN EXPECTED. THOUGH MODELS STEP BACK A BIT ON AVAILABLE MOISTURE MONDAY...BELIEVE THERE WILL BE SOME REMNANT OUTFLOW BOUNDARIES LEFT FROM TONIGHTS CONVECTION...SO WILL EXPECT ABOUT THE SAME LEVEL OF THUNDERSTORM DEVELOPMENT MONDAY. THE RIDGE IS EXPECTED TO SLIDE A BIT TO THE EAST TUESDAY WHICH MAY OPEN UP A SLIGHTLY MORE MOIST FLOW ON THE WEST SIDE OF THE RIDGE. BUMPED UP THE POPS AND THUNDERSTORMS COVERAGE FOR TUE AFTERNOON. MODELS HIGH TEMP GUIDANCE LOOKS GOOD... BUT LOW TEMP GUIDANCE HAS BEEN RUNING A BIT WARM. .LONG TERM...TUESDAY NIGHT THROUGH SUNDAY... THE 12Z GFS RUN IS A LITTLE DRIER THAN PREVIOUS RUNS IN SHOWING AN INCREASE IN MOISTURE THROUGH NEXT WEEKEND. PREVIOUS RUNS INDICATE THAT OUR PERSISTENT 4-CORNERS RIDGE WILL SHIFT TO THE EAST WITH A SOUTHERLY COMPONENT TO THE FLOW DEVELOPING BY AROUND MIDWEEK. THIS SOLUTION IS MORE MONSOON-LIKE AND WOULD ALLOW A MORE DIRECT PATH FOR SUB-TROPICAL MOISTURE...AND IT IS SUPPORTED BY THE 12Z NAM AND THE 00Z EC. THE LATEST GFS KEEPS THE RIDGE CENTERED OVER THE 4-CORNERS... HENCE IS A LITTLE DRIER AND WARMER. AT THIS TIME...HAVE STAYED WITH THE PREVIOUS FORECAST. IN ANY CASE...EVEN WITH THE DRIER SOLUTION...WE STILL KEEP SOME MOISTURE ROTATING UNDER THE RIDGE. SO THE DIURNALLY DRIVEN CHANCE MOUNTAINS...SLIGHT CHANCE VALLEYS WILL NOT BE TOO FAR OFF THE MARK. && .AVIATION... VFR CONDITIONS WILL PREVAIL TODAY TONIGHT. ISOLATED THUNDERSTORMS WILL BE PRIMARILY CONFINED TO THE RIDGETOPS OF WESTERN COLORADO AND EASTERN UTAH. OUTFLOW THUNDERSTORM WINDS WILL GENERATE ERRATIC WIND GUSTS AT THE MOUNTAIN AIRPORTS...AND POSSIBLY KGJT AND KMTJ DURING THE EVENING HOURS AS THESE OUTFLOWS MAY TRAVEL 100 MILES OR MORE BEFORE DISSIPATING. && .GJT WATCHES/WARNINGS/ADVISORIES... .CO...NONE. .UT...NONE. SHORT TERM...CJC LONG TERM...EH AVIATION...PF/CJC
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GRAND JUNCTION CO 600 AM MDT SUN JUL 15 2007 COZ001>014-017>023-UTZ022>025-027>029-161200- 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 15 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN UTAH AND WESTERN COLORADO. .DAY ONE...TODAY AND TONIGHT ISOLATED THUNDERSTORMS WITH LITTLE OR NO RAINFALL WILL DEVELOP OVER THE HIGHER TERRAIN IN THE AFTERNOON. LIGHTNING AND STRONG GUSTY WINDS TO 45 MPH WILL ACCOMPANY THESE STORMS. STORMS WILL DISSIPATE AFTER SUNSET. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY ISOLATED THUNDERSTORMS WILL DEVELOP OVER THE HIGH MOUNTAINS ON MONDAY AFTERNOON. SCATTERED THUNDERSTORM ACTIVITY WILL INCREASE TUESDAY AFTERNOON AND CONTINUE FOR THE REMAINDER OF THE WEEK... MAINLY IN THE MOUNTAINS. A FEW OF THESE STORMS WILL DRIFT OFF THE MOUNTAINS AND IMPACT VALLEY LOCATIONS. LIGHTNING...GUSTY WINDS AND BRIEF HEAVY SHOWERS WILL ACCOMPANY THE STORMS. .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 00:28 UTC.
1 thunderstorm wind. Local standard time, as filed.
Trees and power lines were blown down across 24 1/2 Road between F 1/2 Road and G Road.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Colorado in 2007Every state in 2007This day in weather historyWarnings in Colorado, July 2007
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: 49709.