Portions of extreme northeast Utah remained abnormally dry, while improvement to near normal conditions spread into extreme southeast Utah.
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.
Portions of extreme northeast Utah remained abnormally dry, while improvement to near normal conditions spread into extreme southeast Utah.
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 Sep 30, 2:30 PM MST, 9 hours 30 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GRAND JUNCTION CO 330 PM MDT THU SEP 30 2010 .SHORT TERM...TONIGHT THROUGH SATURDAY... STRONG AND PERSISTENT HIGH PRESSURE OVER THE WESTERN STATES WILL CONTINUE TO DOMINATE THE WEATHER PATTERN THROUGH THE WEEKEND. THE AXIS OF HIGH PRESSURE CURRENTLY OVER THE NORTHERN GREAT BASIN WILL MAKE VERY LITTLE MOVEMENT OVER THE NEXT FEW DAYS RESULTING IN CONTINUED DRY WEATHER WITH NEAR RECORD WARMTH. AN AREA OF LOW PRESSURE SPINNING OFF THE SOUTHERN CA COAST HAS BEGUN TO SPREAD MOISTURE INTO SW UT THIS AFTERNOON AND WILL CONTINUE TO PUSH MOISTURE EASTWARD OVER THE NEXT COUPLE DAYS. MODELS SHOW MOST OF THIS MOISTURE REMAINING IN THE UPPER LEVELS...WHICH WILL BRING PERIODS OF HIGH CLOUDS ACROSS THE AREA FRIDAY AND SATURDAY. HOWEVER...ENOUGH MOISTURE MAY SNEAK INTO THE SOUTHERN ZONES TO SPARK AN ISOLATED AFTERNOON SHOWER OR STORM OVER THE SOUTHERN MOUNTAINS. ANY STORMS THAT FORM WILL BE HIGH BASED AND PRODUCE GUSTY OUTFLOW WINDS WITH LITTLE RAINFALL. .LONG-TERM...SATURDAY NIGHT THROUGH THURSDAY... HIGH PRESSURE WILL STILL DOMINATE AT THE BEGINNING OF THE PERIOD. BUT WE WILL CONTINUE TO SEE MOISTENING OF THE ATMOSPHERE FROM THE SOUTH THROUGH THE WEEKEND. THE ENTIRE LARGE SCALE PATTERN WILL SHIFT TO THE EAST EARLY IN THE WEEK WITH AN OMEGA BLOCK DEVELOPING ACROSS THE CONUS BY MIDWEEK. STRONG CUTOFF LOW PRESSURE SYSTEMS WILL BECOME ANCHORED OVER THE GREAT BASIN AND THE EASTERN U.S...WITH HIGH PRESSURE FOR THE COUNTRY/S MID-SECTION. MODEL CONSISTENCY HAS IMPROVED OVER THE LAST FEW RUNS WITH THE 12Z ECMWF JUST A LITTLE MORE WESTERLY AS COMPARED TO THE 12Z GFS. FOR THE DETAILS...THE CHANCE FOR SHOWERS AND THUNDERSTORMS WILL INCREASE ON SUNDAY AS MOISTURE CONTINUES TO MOVE UP FROM THE SOUTH. THE SOUTHERN MOUNTAINS WILL REMAIN FAVORED. THEN AS A PACIFIC TROUGH MOVES ONSHORE SUNDAY NIGHT/MONDAY AND THE RIDGE SHIFTS EAST...THE SOUTHERLY FLOW WILL INCREASE OVER OUR FORECAST AREA...BRINGING DEEPER MOISTURE. THE TROUGH WILL MOVE INTO THE GREAT BASIN WHERE REINFORCING IMPULSES WILL CARVE OUT THE WESTERN CUTOFF. A MOIST AND UNSTABLE SOUTHWEST FLOW UPSTREAM OF THE LOW WILL RESULT IN A CONTINUED CHANCE OF SHOWERS AND THUNDERSTORMS THROUGH THE END OF THE PERIOD. TEMPERATURES WILL COOL A LITTLE ON SUNDAY IN RESPONSE TO MORE CLOUDS/SHOWERS. THEN THE COOLING TREND WILL ACCELERATE WITH HIGH TEMPS PROGGED TO REACH NORMAL VALUES OR BELOW BY TUESDAY. NIGHTTIME TEMPS SHOULD NOT DROP TOO LOW DUE TO THE ENERGETIC FLOW AND MOIST REGIME. THEREFORE I DO NOT THINK THAT WE WILL SEE ANY ADDITIONAL VALLEYS FREEZE DURING THIS PERIOD. && .AVIATION... VFR CONDITIONS WILL CONTINUE OVER ALL TAF SITES TONIGHT THROUGH FRIDAY. PERIODS OF HIGH CLOUDS WILL STREAM ACROSS THE AREA FRIDAY WITH AN ISOLATED THUNDERSTORM POSSIBLE OVER THE SOUTHERN CO AND SOUTHEAST UT MTNS. GUSTY OUTFLOW WINDS ARE POSSIBLE NEAR ANY SHOWERS/STORMS. && .FIRE WEATHER... ISOLATED DRY THUNDERSTORMS EXPECTED FRIDAY AND SATURDAY MAINLY ACROSS SOUTHWEST COLORADO AS MID-LEVEL MOISTURE CREEPS IN. PRESENCE OF THE UPPER LEVEL RIDGE EXPECTED TO SUPPRESS THUNDERSTORM COVERAGE ENOUGH SO THAT A FIRE WEATHER WATCH IS NOT WARRANTED AT THE MOMENT. CHANGE IS IN STORE FOR NEXT WEEK AS AN UPPER TROUGH SETTLES OVER THE SOUTHERN GREAT BASIN. THIS SHOULD RESULT IN A MOISTER SOUTHERLY FLOW THAT MAY RESULT IN PERIODIC CHANCES OF SHOWERS AND RESULTANT SMALLER BURN WINDOWS. && .GJT WATCHES/WARNINGS/ADVISORIES... CO...NONE. UT...NONE. SHORT TERM.....MCS LONG TERM......JOE+EH AVIATION.......MCS FIRE WEATHER...JAD
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GRAND JUNCTION CO 347 AM MDT THU SEP 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- 347 AM MDT THU SEP 30 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN UTAH AND WESTERN COLORADO. .DAY ONE...TODAY AND TONIGHT NO HAZARDOUS WEATHER IS EXPECTED THROUGH TONIGHT. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY MOISTURE WILL INCREASE MOSTLY OVER SOUTHWEST CO AND SOUTHEAST UT ON FRIDAY. DAYTIME HEATING WITH ALLOW ISOLATED AFTERNOON THUNDERSTORMS TO FORM OVER THE SOUTHERN MOUNTAINS. THIS TREND WILL CONTINUE THROUGH THE WEEKEND. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED TODAY OR TONIGHT.
The national radar mosaic for the moment the first event began.
4 drought. Local standard time, as filed.
Abnormally dry conditions remained in place over the area.
Abnormally dry conditions remained in place over the area.
Abnormally dry conditions remained in place over the area.
Abnormally dry conditions were alleviated by the end of the month across extreme southeast Utah.
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, October 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: 339022, 339023, 339024, 339025.