Drought conditions across eastern Utah were unchanged through the month, except for a sliver of southern San Juan County that improved to abnormally dry conditions.
Every event with a place to put it; 1 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.
Drought conditions across eastern Utah were unchanged through the month, except for a sliver of southern San Juan County that improved to abnormally dry conditions.
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 31, 1:50 PM MST, 10 hours 10 minutes earlier.
AREA FORECAST DISCUSSION...CORRECTED NATIONAL WEATHER SERVICE GRAND JUNCTION CO 250 PM MDT SAT JUL 31 2010 CORRECTED LONG TERM SECTION TO ADD MISSING WORDS .SHORT TERM...TODAY THROUGH MONDAY... SUBTROPICAL HIGH IS IN THE PROCESS OF REPOSITIONING ITSELF EAST OF COLORADO. THIS WILL ALLOW LIGHT SOUTHERLY FLOW TO SPREAD NORTH ACROSS THE ENTIRE FORECAST AREA THIS EVENING. EASTERLY WAVE OVER ERN NEW MEXICO IS PROGGED TO APPROACH SW COLORADO TONIGHT AND THEN SHEAR NORTHEAST ACROSS THIS AREA SUNDAY NIGHT. THIS KEEPS THE MONSOONAL PLUME LOCKED ACROSS THE FORECAST AREA...BUT IT WILL EXPAND NORTHWARD GIVEN THE LIGHT SOUTHERLY FLOW. THE AIR MASS ENVIRONMENT REMAINS SIMILAR WITH SLOW MOVING CELLS...SO WILL GO AHEAD AND ISSUE ANOTHER FLASH FLOOD WATCH ON SUNDAY BUT EXPAND IT NORTHWARD TO INCLUDE THE GRAND VALLEY...TAVAPUTS AND BOOKCLIFF AREAS. MONDAY...MONSOONAL PLUME TAKES A SOUTHWEST TO NORTHEAST ORIENTATION AS A PACIFIC NORTHWEST TROUGH SKIRTS INLAND. THIS BRINGS DRIER AIR TOWARD THE WYOMING BORDER...OTHERWISE THE AIR MASS KEEPS IT MONSOONAL ENVIRONMENT. A STRONGER EASTERLY WAVE WILL BE APPROACHING THE FOUR CORNERS AREA MONDAY EVENING...POSSIBLY ENHANCING CONVECTION FOR THE SRN AREAS. .LONG TERM...MONDAY NIGHT THROUGH SATURDAY... APPEARS THE FORECAST AREA COULD STAY IN AN UNSETTLED AND WET PATTERN THROUGH AT LEAST MIDWEEK. THE EXPECTED LARGE-SCALE PATTERN IS FOR A GRADUALLY AMPLIFYING WEST COAST TROUGH...WITH THE PERSISTENT BROAD HIGH PRESSURE CENTERED OVER THE SOUTH CENTRAL PORTION OF THE COUNTRY. SOUTHERLY FLOW BETWEEN THE TWO SHOULD KEEP THE SUBTROPICAL MOISTURE PLUME ACROSS THE 4 CORNERS AND HELP GUIDE SEVERAL EMBEDDED DISTURBANCES THROUGH THE AREA. STRONGER ONE LOOKS TO MOVE NE ACROSS THE AREA WED. PAC NW TROUGH ALSO EJECTS A WAVE ACROSS ID MONDAY NIGHT-TUESDAY THAT MAY INTERACT WITH THE NORTHERN REACHES OF THE MOISTURE. MODELS SHOW A GRADUAL DECREASE IN MOISTURE/POPS FROM THE WEST AND NORTHWEST LATE IN THE WEEK...BUT HAVE SOME DOUBTS WITH THE GFS HOLDING ONTO SOME WEST COAST TROUGHING. MAIN CHANGE TO THE FORECAST WAS TO BOOST THE CHANCE OF PRECIP FOR TUE-WED. WEAK 700 MB WINDS TUE-WED WILL KEEP THE THREAT OF SLOW MOVING STORMS AND HEAVY RAIN PRESENT. FLOW ALOFT THEN SHOWN TO STRENGTHEN BY FRI FOR FASTER MOVING STORMS LATE IN THE WEEK. && .AVIATION... THE PERSISTENT PATTERN OF AFTERNOON SHOWERS AND THUNDERSTORMS LINGERING WELL INTO THE EVENING...WILL CONTINUE INTO MONDAY. STORM ACTIVITY WILL BE MORE NUMEROUS ACROSS THE SOUTHERN MOUNTAINS WITH SCATTERED STORMS NORTH OF THE I-70 CORRIDOR. LOOK FOR AREAS OF MVFR CIGS AND VIS IN HEAVY RAIN TO RESULT IN MOUNTAIN OBSCURATIONS AFTER 1200...CONTINUING WELL INTO THE EVENING. POCKETS OF TORRENTIAL DOWNPOURS WILL RESULT IN IFR OR LIFR CIGS AND VIS. ADDITIONAL HAZARDS INCLUDE OUTFLOW WINDS TO 40 MPH AND SMALL HAIL. && .GJT WATCHES/WARNINGS/ADVISORIES... CO...NONE UT...NONE. SHORT TERM.....PF LONG TERM......JAD AVIATION.......NL
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GRAND JUNCTION CO 545 AM MDT SAT JUL 31 2010 COZ001>014-017>023-UTZ022>025-027>029-011200- 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- 545 AM MDT SAT JUL 31 2010 ...FLASH FLOOD WATCH IN EFFECT THIS AFTERNOON AND EVENING FOR SOUTHEAST UTAH AND SOUTHWEST COLORADO... THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN UTAH AND WESTERN COLORADO. .DAY ONE...TODAY AND TONIGHT NUMEROUS SHOWERS AND THUNDERSTORMS WILL REDEVELOP ACROSS MUCH OF WESTERN COLORADO AND EASTERN UTAH THIS AFTERNOON...CONTINUING WELL INTO THE NIGHT. THE STRONGEST THUNDERSTORMS WILL PRODUCE SMALL HAIL...GUSTY WINDS TO 40 MPH AND VERY HEAVY RAINFALL. HEAVY DOWNPOURS WILL LIKELY LEAD TO FLASH FLOODING ACROSS PORTIONS OF SOUTHEAST UTAH AND SOUTHWEST COLORADO...ESPECIALLY NEAR STEEP TERRAIN AND IN NARROW SLOT CANYONS. THEREFORE...A FLASH FLOOD WATCH REMAINS IN EFFECT FOR THESE AREAS FROM NOON THROUGH 9 PM THIS EVENING. PLEASE SEE THE GRAND JUNCTION NATIONAL WEATHER SERVICE WEB SITE AT WEATHER.GOV/GJT FOR THE LATEST INFORMATION. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY DEEP MONSOONAL FLOW INTO UTAH AND COLORADO WILL CONTINUE THROUGH EARLY NEXT WEEK. THIS WILL RESULT IN NUMEROUS SHOWERS AND THUNDERSTORMS...SOME PRODUCING HEAVY RAIN. LOCALIZED FLASH FLOODING MAY BE POSSIBLE SUNDAY AFTERNOON AND EVENING. WHILE THE CHANCE FOR LATE DAY SHOWERS AND THUNDERSTORM WILL PERSIST EACH DAY THROUGH FRIDAY...LESS COVERAGE IS EXPECTED DURING THE SECOND HALF OF THE WEEK AS DRIER AIR BEGINS TO MOVE OVER THE AREA. .SPOTTER INFORMATION STATEMENT SPOTTER ACTIVATION IS POSSIBLE IN SOME AREAS TODAY. REPORTS OF SIGNIFICANT WEATHER WILL AGAIN BE APPRECIATED. NL/ELH
The national radar mosaic for the moment the first event began.
1 drought. Local standard time, as filed.
The extreme southern San Juan County drought status improved from moderate drought to abnormally dry conditions due to an active monsoon period.
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, August 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: 254832.