Thunderstorm outflow produced strong wind gusts over Western Mesa County.
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The episode as NWS GJT wrote it up.
Thunderstorm outflow produced strong wind gusts over Western Mesa County.
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 13, 2:10 PM MST, 1 hour 27 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GRAND JUNCTION CO 310 PM MDT TUE JUL 13 2010 .SHORT TERM...TONIGHT THROUGH THURSDAY... BROAD AREA OF HIGH PRESSURE CONTINUES GRIP ON DESERT SOUTHWEST THROUGH REMAINDER OF WEEK. MODEL SOUNDINGS SHOWED WEAK CAPS AT THE H5 LEVEL FOR THIS AFTN BUT AS RADAR MOSAIC SHOWS...CAP HAS ALREADY BROKEN WITH ISOLD/SCTD CONVECTION OVR ENTIRE CWA. MINOR DISTURBANCES CONTINUE TO ROTATE UNDER HIGH PRESSURE AND COMBINED WITH MAX HEATING...HAS CAUSED CONDITIONAL UNSTABLE ATMOSPHERE TO BECOME COMPLETELY UNSTABLE...THUS THE THUNDERSTORMS. THIS CONVECTIVE ACTIVITY WILL CONTINUE THROUGH THE EVENING HOURS UNTIL AFTER SUNSET WHEN MOST PRECIPITATION WILL END. CALM OVERNIGHT WILL LEAD TO ANOTHER DAY OF ISOLD/SCTD CONVECTION OVR CWA. TROUGH LOCATED FROM MT THRU NRN UT WILL GET SHEARED OUT AS IT PASSES JUST TO N OF CO SO THERE WILL BE SOME AFFECTS TO OUR WX BUT NOT AS MUCH AS PREVIOUSLY THOUGHT. MAIN EFFECT WILL BE BREEZY WINDS FOR EXTREME NRN CO. HOWEVER...FOR REMAINDER OF CO AND UT...WEAK VORT MAXES WILL STILL BE ROTATING THRU MEAN FLOW SO AFTN CONVECTION WILL CONTINUE. SUBSIDENCE WILL CONTINUE UNDER HIGH PRESSURE KEEPING ATMOSPHERE WARM AND DRY. MODELS DROPPING AMT OF AREAL CONVECTIVE COVERAGE FOR THURSDAY BUT FEEL WITH SIGNIFICANT HEATING AND FAVORABLE OROGRAPHICS...CONVECTION A NO-BRAINER FOR SAN JUANS SO KEPT SLIGHT CHANCES IN FORECAST. FINALLY...THE WARM UP CONTINUES AS HIGH PRESSURE OVERHEAD AND SUBSIDENCE INCREASES HIGH TEMPS DAY BY DAY. UPPER 90S WILL BE THE RULE FOR VALLEY AREAS ACROSS UT/CO WITH SOME VALLEY LOCATIONS BREAKING THE CENTURY MARK ON THURSDAY. THESE HOT TEMPS WILL CONTINUE AS LONG AS STRONG HIGH PRESSURE PERSISTS. .LONG TERM...THURSDAY NIGHT THROUGH TUESDAY... AFTER A WARM AND MOSTLY DRY START...MONSOONAL MOISTURE RETURNS NEXT WEEKEND. THURSDAY NIGHT-FRIDAY NIGHT...THE SUBTROPICAL HIGH IS CENTERED IN NE AZ. THE MODELS REMAIN CONSISTENT IN DRIER AIR ROTATING IN NW FLOW. STILL A SLIGHT CHANCE OF A LATE-DAY THUNDERSHOWER NEAR THE CONTINENTAL DIVIDE IN RESIDUAL MOISTURE AND STRONG HEATING ABOVE NORMAL. SATURDAY-SUNDAY...MOISTURE RETURNS FROM THE SW WITH PRECIPITABLE WATER APPROACHING 1 INCH NEAR THE FOUR-CORNERS. HOT TEMPERATURES START TO MODIFY BY SUNDAY UNDER INCREASING CLOUDS AND SHOWERS. MONDAY-TUESDAY...THE SUBTROPICAL HIGH GETS NUDGED EAST AS A PACIFIC TROUGH DEVELOPS ALONG THE WEST COAST. PERTURBED SW FLOW CONTINUES TO ADVECT MOISTURE OVER THE REGION FOR INCREASED THUNDERSHOWER COVERAGE. TEMPERATURES WILL ALSO BE LESS HOT. && .AVIATION... HIGH PRESSURE CENTERED OVER THE DESERT SOUTHWEST WILL PROVIDE VFR CONDITIONS FOR NEXT 24 HRS. HOWEVER...TAF SITES WILL BE VULNERABLE TO SUDDEN WIND GUSTS...POSSIBLY AS HIGH AS 40 TO 45 KNOTS AT THE DESERT SITES...FROM NEARBY THUNDERSTORMS AND OUTFLOW BOUNDARIES. && .GJT WATCHES/WARNINGS/ADVISORIES... CO...NONE UT...NONE SHORT TERM.....TGR LONG TERM......JOE AVIATION.......TGJT
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GRAND JUNCTION CO 600 AM MDT TUE JUL 13 2010 COZ001>014-017>023-UTZ022>025-027>029-141200- 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 TUE JUL 13 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN UTAH AND WESTERN COLORADO. .DAY ONE...TODAY AND TONIGHT SCATTERED THUNDERSTORMS WILL DEVELOP THIS AFTERNOON...INITIAL DEVELOPMENT OVER THE MOUNTAINS...BUT A FEW OF THESE STORMS WILL DRIFT OVER THE VALLEYS BY LATE IN THE DAY. STRONG GUSTY WINDS IN THE 40 TO 50 MPH RANGE WILL BE POSSIBLE WITH LATE DAY THUNDERSTORMS. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY THE CHANCE OF THUNDERSTORMS WILL TREND DOWNWARD ON WEDNESDAY AND WILL BE PRIMARILY FOCUSED OVER THE HIGH TERRAIN OF THE WESTERN SLOPE. THURSDAY AND FRIDAY...DRY AND HOT EACH DAY WITH A SLIGHT CHANCE OF THUNDERSTORMS OVER THE SAN JUAN MOUNTAINS. SATURDAY THROUGH MONDAY...MOISTURE RETURNS FOR A BETTER THREAT OF AFTERNOON AND EVENING THUNDERSTORMS. TEMPERATURES WILL CONTINUE TO BE ABOVE AVERAGE...ALTHOUGH SLIGHT COOLING MAY OCCUR WITH THE INCREASED OF AFTERNOON CLOUD COVER. .SPOTTER INFORMATION STATEMENT SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY OR TONIGHT.
The Grand Junction radar (KGJX), 66 km away, was scanning. The volume nearest the first event began at 22:37 UTC.
1 thunderstorm wind. Local standard time, as filed.
Thunderstorm outflow wind gusts to 58 mph were measured at a location about 5 miles north of Mack.
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: 353266.