Thunderstorm outflow winds produced strong wind gusts in Montrose County.
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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.
Thunderstorm outflow winds produced strong wind gusts in Montrose 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 26, 8:05 PM MST, 3 hours 53 minutes earlier.
AREA FORECAST DISCUSSION...UPDATED NATIONAL WEATHER SERVICE GRAND JUNCTION CO 905 PM MDT MON JUL 26 2010 .UPDATE... SHOWERS AND THUNDERSTORMS CONTINUE TO TRACK OVER PORTIONS OF EASTERN UT AND WESTERN CO THIS EVENING. UPDATED EVENING FORECAST FOR THIS CURRENT TREND. .SHORT TERM...TONIGHT THROUGH WEDNESDAY... HIGH PRESSURE HAS SETTLED DIRECTLY OVER THE FORECAST AREA AND AS A RESULT THE PLUME OF SUBTROPICAL MOISTURE HAS SHIFTED SOUTH AND WEST OF THE AREA. HOWEVER...DEW POINTS REMAINED HIGH ACROSS THE SOUTH WITH 1 INCH PW (PRECIPITABLE WATER) VALUES HOVERING NEAR THE SOUTHERN COLORADO BORDER. AMPLE SUNSHINE DURING THE MORNING HOURS WORKING ON THIS DEEP MOISTURE WILL SUSTAIN SCATTERED SHOWERS AND THUNDERSTORMS OVER THE SOUTHERN MOUNTAINS WITH ISOLATED TO WIDELY SCATTERED COVERAGE OVER THE CENTRAL AND NORTHERN MOUNTAINS LATE THIS AFTERNOON AND INTO THE EVENING. THE STORM MOTION VECTOR OVER THE SOUTH WILL MOVE STORMS TO THE NORTH WHICH WILL REDUCE THE NUMBER OF STORMS EXPECTED OVER THE LOWER ELEVATIONS SOUTH OF THE SAN JUANS TODAY. DEVELOPING STORMS WILL CONTINUE TO BE SLOW MOVING SO THE THREAT OF HEAVY RAIN AND LOCALIZED FLOODING CONTINUES THROUGH THE EVENING...ESPECIALLY ACROSS THE SOUTH. HOWEVER...AS HAS BEEN THE CASE OVER THE PAST SEVERAL DAYS...NO DISCERNIBLE UPPER LEVEL SUPPORT OR SUFFICIENT SHEAR TO SUPPORT LONG-LIVED CELLS FAVORABLE FOR A WIDESPREAD FLASH FLOOD OUTBREAK. THEREFORE...WILL NOT ISSUE A FLASH FLOOD WATCH WITH THIS PACKAGE. THE CENTER OF HIGH PRESSURE WILL SHIFT EAST OF THE DIVIDE TONIGHT RESULTING IN A RETURN TO SOUTHWEST FLOW AND THE REINTRODUCTION OF MOIST SUBTROPICAL AIR. MODELS INDICATED TO A GREATER (GFS40) AND LESSER DEGREE (NAM/ECMWF) THAT A WEAK DISTURBANCE MOVING NORTHEASTWARD WILL GENERATE NOCTURNAL SHOWERS AND POSSIBLY EMBEDDED THUNDERSTORMS LATER TONIGHT AND INTO TUESDAY MORNING. GFS40 SHOWED SOME SIGNS OF CONVECTIVE FEEDBACK...THOUGH COINCIDENT RIGHT EXIT REGION OF 60 KT JET ORIENTED SOUTHWEST TO NORTHEAST ACROSS UTAH COULD PROVIDE SUFFICIENT SUPPORT FOR THIS SCENARIO TO MATERIALIZE. NAM... RUC AND EC ALSO HINTED AT THIS SOLUTION SO WILL MENTION SLIGHT CHANCE OF PCPN OVER SOUTHEAST UTAH AND THE WESTERNMOST PORTIONS OF COLORADO TO ACCOUNT FOR THIS POSSIBILITY. TUESDAY AND WEDNESDAY SHAPING UP TO BE MORE ACTIVE AS SOUTH TO SOUTHWESTERLY FETCH OF MONSOON MOISTURE SURGES OVER THE REGION. DEEP MOISTURE EXPECTED TO SURGE NORTHWARD ACROSS EASTERN UTAH AND THE WESTERNMOST PORTION OF COLORADO BRINGING PW VALUES TO NEAR AN INCH TO MUCH OF THE AREA. STEERING WINDS REMAIN LIGHT AND IN VIEW OF THE DISTURBANCE DISCUSSED ABOVE...THERE MAY BE A NEED FOR A FLASH FLOOD WATCH OVER MUCH OF SOUTHEAST UTAH AND WEST-CENTRAL AND SOUTHWEST COLORADO TUESDAY AFTERNOON AND EVENING. SIMILAR CONDITIONS EXPECTED ON WEDNESDAY WITH USUAL DIURNAL DOWNTURN IN ACTIVITY TUESDAY NIGHT. DAYTIME TEMPERATURES WILL COOL WITH THE RETURN OF CLOUDS AND SHOWERS ASSOCIATED WITH THE RETURN OF MONSOON MOISTURE AND GUIDANCE SEEMS TO HAVE THIS TREND HANDLED WELL. OVERNIGHT LOWS EXPECTED TO BALANCE COOLER AFTERNOON HIGHS AGAINST INCREASED CLOUDS AND MOISTURE FOR NEAR PERSISTENCE FORECAST. .LONG TERM...WEDNESDAY NIGHT THROUGH TUESDAY... LITTLE CHANGE SEEN THIS LONG TERM PERIOD WITH HIGH PRESSURE CENTERED NEAR TX PANHANDLE/WESTERN OK. THIS POSITIONING WILL HELP TO FUEL A STRONG MONSOONAL PATTERN. A MOIST SOUTHWESTERLY FLOW WILL BE OVER THE REGION THIS PERIOD WITH PRECIP WATER VALUES GENERALLY IN EXCESS OF 1 INCH. LIGHT FLOW ALOFT WILL GENERALLY PRECLUDE ORGANIZED CELLS BUT LOCALLY HEAVY RAINFALL COULD BE POSSIBLE DUE TO SLOW STORM MOVEMENT AND TRAINING OVER FAVORED TERRAIN. AT THIS TIME HARD TO PICK UP ON ANY DEFINABLE SHORT WAVES THAT WOULD ENHANCE ACTIVITY...BUT THATS NOT OUT OF THE QUESTION. EARLIER DISCUSSION OUT OF NCNTRL TX NOTED A TUTT FEATURE ...THAT ALSO SEEMS RESOLVED BY THE MODELS. INTERESTINGLY THIS FEATURE TRACKS ONTO THE 4 CORNERS AROUND 12Z SUNDAY. HOWEVER THATS FAR ENOUGH OUT NOT TO GET TO EXCITED FOR NOW. OTHERWISE MADE ONLY MINOR CHANGES TO POP GRIDS. && .AVIATION... LITTLE CHANGE INDICATED TODAY WITH ISOLATED TO SCATTERED THUNDERSTORMS DEVELOPING OVER THE CENTRAL AND SOUTHWEST COLORADO MOUNTAINS...AND THE EASTERN UTAH MOUNTAINS AGAIN THIS AFTERNOON... CONTINUING INTO THIS EVENING. STORMS WILL CREATE AREAS OF MOUNTAIN OBSCURATIONS WITH MVFR CIGS AND VSBY IN RAIN SHOWERS. LOCALIZED IFR CIGS AND VSBY ARE LIKELY IN THE SAN JUAN MOUNTAINS AND THE LOWER ELEVATIONS TO THE SOUTH DUE TO HEAVY RAINFALL. && .GJT WATCHES/WARNINGS/ADVISORIES... CO...NONE UT...NONE. UPDATE.........AS SHORT TERM.....NL LONG TERM......MC AVIATION.......NL
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GRAND JUNCTION CO 437 AM MDT MON JUL 26 2010 COZ001>014-017>023-UTZ022>025-027>029-271130- 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- 437 AM MDT MON JUL 26 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN UTAH AND WESTERN COLORADO. .DAY ONE...TODAY AND TONIGHT ISOLATED TO SCATTERED THUNDERSTORMS AND SHOWERS ARE EXPECTED AGAIN TODAY...MOST NUMEROUS OVER SOUTHWEST COLORADO AND SOUTHEAST UTAH. SOME STORMS WILL BRING BRIEF HEAVY RAIN SHOWERS AND FREQUENT LIGHTNING. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH MONDAY THE CHANCE OF SHOWERS AND THUNDERSTORMS WILL STEADILY RISE WEDNESDAY THROUGH FRIDAY...WITH THE STRONGEST STORMS FAVORING THE AFTERNOON AND EARLY EVENING HOURS OVER SOUTHEAST UTAH AND SOUTHWEST COLORADO. FRIDAY AND SATURDAY...DEEP MONSOONAL FLOW INTO UTAH AND COLORADO BRINGS THE THREAT OF NUMEROUS STORMS WITH LOCALLY HEAVY RAINS. THE POTENTIAL EXISTS FOR LOCALIZED FLASH FLOODING. SUNDAY AND MONDAY...MONSOONAL FLOW WEAKENS BUT SUFFICIENT MOISTURE FOR SCATTERED SHOWERS AND STORMS EACH AFTERNOON AND EARLY EVENING. LOCALLY HEAVY RAIN WILL STILL BE POSSIBLE. .SPOTTER INFORMATION STATEMENT SPOTTER ACTIVATION IS POSSIBLE IN SOME AREAS TODAY. REPORTS OF SIGNIFICANT WEATHER WILL AGAIN BE APPRECIATED. CJC/PF
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GRAND JUNCTION CO 707 PM MDT MON JUL 26 2010 UTZ027-270130- ARCHES/GRAND FLAT UT- 707 PM MDT MON JUL 26 2010 ...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL GRAND COUNTY UNTIL 730 PM MDT... AT 658 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 14 MILES NORTHWEST OF MOAB...MOVING NORTH AT 15 MPH. HAIL UP TO THE SIZE OF NICKELS AND WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN. LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE... MAINLY RURAL AREAS OF CENTRAL GRAND COUNTY INCLUDING HIGHWAY 191 AND THE WESTERN PART OF ARCHES NATIONAL PARK. TORRENTIAL RAIN...WHICH MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND UNDERPASSES...IS ALSO LIKELY. DO NOT DRIVE YOUR VEHICLE ON A FLOODED ROADWAY. AS
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GRAND JUNCTION CO 749 PM MDT MON JUL 26 2010 UTZ025-027-270230- ARCHES/GRAND FLAT UT-TAVAPUTS PLATEAU UT- 749 PM MDT MON JUL 26 2010 ...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL GRAND COUNTY UNTIL 830 PM MDT... AT 742 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 16 MILES EAST OF GREEN RIVER...MOVING NORTH AT 15 MPH. HAIL UP TO THE SIZE OF NICKELS AND WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN. LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE... INTERSTATE 70 AND MAINLY RURAL AREAS OF CENTRAL GRAND COUNTY. HEAVY RAIN...WHICH MAY FLOOD LOW LYING AREAS SUCH AS DITCHES AND UNDERPASSES...IS ALSO LIKELY. DO NOT DRIVE YOUR VEHICLE ON A FLOODED ROADWAY. AS
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
830 PM MDT MON JUL 26 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0800 PM HEAVY RAIN 18 E GREEN RIVER 38.98N 109.75W
07/26/2010 U0.00 INCH GRAND UT LAW ENFORCEMENT
VERY HEAVY RAIN ALONG 1-70 BETWEEN MM155 AND
147...WIPERS UNABLE TO KEEP UP WITH RAINFALL RATES WITH
WATER PONDING ON ROADWAY.
&&
EVENT NUMBER GJT1000631
MALEKSAPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
837 PM MDT MON JUL 26 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0640 PM HEAVY RAIN 1 WNW CASTLE VALLEY 38.64N 109.41W
07/26/2010 U0.00 INCH GRAND UT TRAINED SPOTTER
NO RAINFALL IN CASTLE VALLEY BUT REPORTS OF VERY HEAVY
RAIN ON THE SOUTH END OF CASTLE VALLEY ALONG PLACER
CREEK.
&&
EVENT NUMBER GJT1000632
MALEKSAThe Grand Junction radar (KGJX), 69 km away, was scanning. The volume nearest the first event began at 06:59 UTC.
1 thunderstorm wind. Local standard time, as filed.
Thunderstorm outflow winds of 59 mph were measured at the Montrose Regional Airport.
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: 353267.