A large portion of Uintah county in northeast Utah improved to near normal conditions, while extreme southeastern portions of the state worsened to abnormally dry and moderate drought.
Every event with a place to put it; 4 filed by county or forecast zone are drawn at its center, in a lighter ring. 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.
A large portion of Uintah county in northeast Utah improved to near normal conditions, while extreme southeastern portions of the state worsened to abnormally dry and moderate drought.
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 30, 1:30 PM MST, 10 hours 30 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GRAND JUNCTION CO 230 PM MDT WED JUN 30 2010 .SHORT TERM...TONIGHT THROUGH FRIDAY... SOUTHERLY FLOW ALOFT WILL CONTINUE TO DRAW SUBTROPICAL MOISTURE NORTHWARD ACROSS OUR AREA THROUGH THE PERIOD. BASED FORECAST MID LEVEL WINDS ALOFT...CANNOT RULE OUT A LITTLE MOISTURE FROM HURRICANE ALEX GETTING CAUGHT UP INTO THE SUBTROPICAL MOISTURE PLUME IN THE SW COLORADO PORTION OF OUR CWA. H0WEVER...WOULD EXPECT MOST OF THE HURRICANE MOISTURE TO STAY WELL EAST OF OUR AREA. MODELS CONTINUE TO INDICATE INCREASING WATER CONTENT OVER OUR CWA THROUGH THE PERIOD...WITH PRECIPITABLE WATER VALUES AROUND AN INCH IN SOME AREAS BY FRIDAY. EXPECT SIMILAR WEATHER DAY TOMORROW AS TODAY WITH SCATTERED SHOWERS AND THUNDERSTORMS...MOSTLY GARDEN VARIETY THUNDERSTORMS. MAIN WEATHER THREAT WILL CONTINUE TO BE LIGHTNING AND GUSTY OUTFLOW WINDS THROUGH THURSDAY...WITH POSSIBLE G50 MPH FROM SOME STORMS THROUGH EARLY THIS EVENING. THEN BUMPED UP THE POPS FOR FRIDAY AS STRONGER DYNAMIC LIFT IN COMBINATION WITH DAYTIME HEATING WILL ENHANCE CONVECTION....RAISING POPS TO LIKELY CATEGORY IN SOME WESTERN COLORADO MOUNTAIN ZONES. LOCALIZED LOW-END FLASH FLOODING COULD RESULT FROM SOME STORMS...ESPECIALLY IF THERE IS ANY TRAINING OF CELLS INTO HIGHER TERRAIN. HOWEVER...STORM MOVEMENT OF 10 TO 20 KNOTS COULD LIMIT POTENTIAL FOR FLASH FLOODING FROM ANY INDIVIDUAL STORM CELL. A POSSIBLE FLY-IN-THE-OINTMENT TO FRIDAY FORECAST IS IF THERE WOULD HAPPEN TO BE TOO MUCH CLOUD COVER... ESPECIALLY THROUGH MIDDAY...THAT WOULD TEND TO SUPPRESS CONVECTION. THE GRADUAL INCREASE IN MOISTURE/CLOUDS SHOULD RESULT IN A TREND TOWARDS HIGHER MIN TEMPERATURES AND LOWER MAX TEMPERATURES THROUGH THE PERIOD. DUE TO MANY PEOPLE PLANNING OUTDOOR ACTIVITIES FOR THE EXTENDED HOLIDAY WEEKEND...WITH SOME SCHEDULING TRIPS TO BEGIN TOMORROW... HAVE ISSUED AN SPS TO EMPHASIZE THE UNSETTLED WEATHER INTO SATURDAY. .LONG TERM...FRIDAY NIGHT THROUGH WEDNESDAY... ..DRIER WEATHER IN STORE FOR THE JULY 4TH HOLIDAY... A PACIFIC TROUGH POSITIONED OVER THE NORTHERN GREAT BASIN SATURDAY MORNING WILL BECOME SHEARED AND POSITIVELY TILTED AS MUCH OF ITS ENERGY LIFTS NORTHEASTWARD INTO WYOMING. AS THE TROUGH PASSES TO THE NORTHWEST OF THE FORECAST AREA...UPPER LEVEL FLOW OVER WESTERN COLORADO AND EASTERN UTAH WILL VEER FROM SOUTHWEST TO WEST- NORTHWEST...GRADUALLY REPLACING THE SUBTROPICAL MOISTURE WITH A DRIER AIRMASS. DESPITE THIS NORTHWEST TO SOUTHEAST DRYING TREND... ENOUGH MOISTURE WILL LINGER ON SATURDAY TO RESULT IN ISOLATED SHOWERS AND THUNDERSTORMS...ESPECIALLY IN THE SOUTHERN MOUNTAINS. ALSO...A WEAK AND NEARLY STATIONARY FRONTAL BOUNDARY DRAPED OVER NORTHEASTERN UTAH AND NORTHERN COLORADO ALONG WITH SOME UPPER LEVEL DIVERGENCE MAY PROVIDE ENOUGH FORCING AND ENVIRONMENTAL SHEAR TO TRIGGER A FEW ISOLATED BUT STRONG THUNDERSTORMS IN THE CENTRAL AND NORTHERN MOUNTAINS. UPPER LEVEL FLOW WILL BECOME LESS AMPLIFIED ON SUNDAY AND MONDAY... BECOMING ALMOST ZONAL WITH THE WESTERLIES WEAKENING. MUCH OF THE MOISTURE LOOKS LIKE IT WILL STAY TO THE EAST OF THE CONTINENTAL DIVIDE BOTH DAYS...AND DRY CONDITIONS ARE EXPECTED TO PREVAIL ALTHOUGH AN ISOLATED AFTERNOON OR EVENING SHOWER OR THUNDERSTORM CANNOT BE RULED OUT IN THE MOUNTAINS NEAR AND ALONG THE CONTINENTAL DIVIDE. TEMPERATURES WILL BE NEAR TO SLIGHTLY BELOW NORMAL THIS WEEKEND WITH THE FAR NORTHERN ZONES FEELING THE EFFECTS OF A WEAK COLD FRONT. TEMPERATURES WILL WARM NEXT WEEK AS THE SUBTROPICAL RIDGE TRIES TO BUILD BACK INTO THE SOUTHWESTERN US. && .AVIATION... SCATTERED AFTERNOON AND EVENING SHOWERS/THUNDERSTORMS WILL RESULT IN SOME MOUNTAIN OBSCURATION AND LOCAL MVFR CONDITIONS THROUGH THE REST OF THE WEEK...THOUGH THERE SHOULD BE A TREND TOWARDS IMPROVEMENT ON SATURDAY. && .GJT WATCHES/WARNINGS/ADVISORIES... CO...NONE. UT...NONE. SHORT TERM.....JRP LONG TERM......BAL AVIATION.......JRP
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GRAND JUNCTION CO 352 AM MDT WED JUN 30 2010 COZ001>014-017>023-UTZ022>025-027>029-011030- 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- 352 AM MDT WED JUN 30 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN UTAH AND WESTERN COLORADO. .DAY ONE...TODAY AND TONIGHT MORE SHOWERS AND THUNDERSTORMS ARE EXPECTED THIS AFTERNOON AND EVENING AS A PLUME OF MONSOON MOISTURE CONTINUES TO AFFECT THE AREA. THESE STORMS WILL CONTINUE INTO THE EVENING. A FEW STORMS WILL PRODUCE WIND GUSTS TO ABOUT 45 MPH. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY. ISOLATED TO SCATTERED LATE DAY SHOWERS AND THUNDERSTORMS ARE POSSIBLE...FAVORING THE MOUNTAINS OF SOUTHWEST COLORADO. LATE- DAY STORMS ON THURSDAY AND FRIDAY THREATEN TO PRODUCE LOCALLY BRIEF BUT HEAVY SHOWERS AND STRONG ERRATIC OUTFLOW WINDS. CHANCES FOR THUNDERSTORMS AND SHOWERS WILL DIMINISH INTO THE HOLIDAY WEEKEND. .SPOTTER INFORMATION STATEMENT SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY OR TONIGHT. CJC
The national radar mosaic for the moment the first event began.
4 drought. Local standard time, as filed.
Central and western portions of the area improved to near normal conditions.
Most of the area improved to near normal conditions with only a small eastern portion of the area that remained abnormally dry.
Abnormally dry conditions spread over the whole area with moderate drought across the extreme southern portion of San Juan County.
Abnormally dry conditions spread over southern portions of the area, while moderate drought conditions developed across the extreme southern portion of San Juan County.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Utah in 2010Every state in 2010This day in weather historyWarnings in Utah, 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: 243307, 243309, 243311, 243312.