Heavy rain producing thunderstorms caused minor flooding in Cortez.
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The episode as NWS GJT wrote it up.
Heavy rain producing thunderstorms caused minor flooding in Cortez.
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 28, 1:15 PM MST, 10 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GRAND JUNCTION CO 215 PM MDT SAT JUL 28 2007 .SHORT TERM...TONIGHT THROUGH MONDAY... CONVECTION NOT QUITE AS ROBUST THUS FAR THIS AFTERNOON COMPARED TO RECENT AFTERNOONS. EVEN SO...A CLUSTER OF CELLS HAVE FORMED OVER THE SAN JUAN MOUNTAINS AND THESE STORMS HAVE BEEN DRIFTING TOWARD THE SOUTHWEST. WITH HIGH PRECIPITABLE WATER...A FEW OF THESE STORMS PRODUCING HEAVY SHOWERS BUT STORMS HAVE SUFFICIENT MOVEMENT THAT HEAVY RAIN AT ANY SPOT HAS NOT OCCURRED. FARTHER NORTH...WATER VAPOR SHOWS THE NRN EDGE OF THE MOISTURE PLUME SLOWLY SINKING SOUTH. DRIER AIR ALOFT HAS PENETRATED NORTHEAST UTAH AND THE EXTREME CORNER OF NORTHWEST COLORADO...AND THIS HAS REDUCED THE CONVECTIVE POTENTIAL ACROSS THIS AREA. HIGH PRESSURE CENTERED OVER UTAH HAS CHANGED THE WINDS ALOFT TO A NORTHERLY COMPONENT...AND DRIER AIR ALOFT WILL GRADUALLY SPREAD SOUTHWARD. THIS DRY AIR WILL NOT MAKE IT TO THE SRN BORDER OF SE UTAH OR SW COLORADO...BUT SHOULD REACH THE NORTH SLOPES OF THE SAN JUAN AND ABAJO (BLUE) MOUNTAINS. THE LOWER BOUNDARY LAYER WILL STAY RELATIVELY MOIST SO ISOLATED STORMS STILL EXPECTED OVER THE NRN MOUNTAINS...THEN DRIFT SOUTH. DEEP LAYERED MOISTURE WILL REMAIN ACROSS THE FAR SOUTH FOR SCATTERED STORMS WITH A FEW HEAVY RAINERS. SIMILAR CONDITIONS ON MONDAY...HOWEVER THE DRY ADVECTION ALOFT WILL HAVE ENDED. MODEL DATA ALREADY HINTING AT THE NEXT SURGE OF MONSOONAL MOISTURE...INITIALLY THIS WILL AFFECT THE WRN HALF OF UTAH BEFORE CIRCULATING INTO NE UTAH AND NW COLORADO. ANOTHER DAY WITH A FEW HEAVY RAINERS OVER THE FAR SOUTH...LESS NUMEROUS AND NOT AS WET STORMS OVER THE NRN TWO THIRDS OF THE FORECAST AREA. .LONG TERM...MONDAY NIGHT THROUGH FRIDAY... MODELS CONTINUE WITH REASONABLE CONSISTENCY FOR THE EXTENDED PERIOD. HIGH PRESSURE WILL BE CENTERED OVER UTAH ON MONDAY NIGHT AND TUESDAY WITH SLIGHTLY LESS MOISTURE AVAILABLE. THIS WILL RESULT IN A SLIGHT DOWN TREND IN AFTERNOON AND EVENING CONVECTION THROUGH TUESDAY. MOST STORMS WILL DEVELOP OVER THE DIVIDE AND THE SAN JUANS WITH JUST A FEW DRIFTING INTO THE LOWER ELEVATIONS. LATER IN THE WEEK THE HIGH WILL SLOWLY SHIFT EAST OPENING THE DOOR FOR THE NEXT SURGE OF MONSOONAL MOISTURE. WEAK EMBEDDED WAVES IN THE SOUTHERLY FLOW COMBINE WITH THE MOISTURE INCREASE FOR MORE ACTIVE WEATHER. WE CAN EXPECT AN INCREASED THREAT OF HEAVY RAIN AND FLASH FLOODING...ESPECIALLY FOR THE SRN HALF OF THE CWA. && .AVIATION... DIURNAL CONVECTION CONTINUES TO BE THE PRIMARY AVIATION HAZARD... OTHERWISE VFR CONDITIONS PREVAIL. AFTERNOON AND EVENING STORMS EXPECTED TO BE MORE NUMEROUS SOUTH OF A LINE FROM KGJT TO KEGE...WITH LESS STORMS NORTH OF THIS LINE. DEEP CONVECTION WILL PRODUCE HEAVY SHOWERS THAT WILL OBSCURE MOUNTAINS AND REDUCE VISIBILITIES. ERRATIC WIND GUSTS POSSIBLE WITH ALL STORMS. THUNDERSTORMS WILL GRADUALLY DECREASE AFTER 02Z AND DIMINISH BY 06Z. && .GJT WATCHES/WARNINGS/ADVISORIES... .CO...NONE. .UT...NONE. SHORT TERM...PF LONG TERM...DJC AVIATION...PF
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GRAND JUNCTION CO 545 AM MDT SAT JUL 28 2007 COZ001>014-017>023-UTZ022>025-027>029-291145- 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 28 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN UTAH AND WESTERN COLORADO. .DAY ONE...TODAY AND TONIGHT ISOLATED TO SCATTERED THUNDERSTORMS ARE EXPECTED TO THIS AFTERNOON AND EVENING. DANGEROUS CLOUD TO GROUND LIGHTNING...LOCALLY HEAVY RAINFALL AND SMALL HAIL WILL ACCOMPANY THE STRONGEST THUNDERSTORMS. HEAVY RAINFALL MAY CAUSE A FEW ARROYOS AND SMALL STREAMS TO QUICKLY FILL OR RUN HIGH WITH FAST FLOWING WATER. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY MONDAY AND TUESDAY...DRIER AIR SPREADS ACROSS NORTHEAST UTAH AND NORTHWEST COLORADO...THE CHANCE OF AFTERNOON AND EVENING THUNDERSTORMS CONTINUES BUT PRIMARILY CONFINED TO THE HIGHER TERRAIN WITH A FEW STORMS DRIFTING OVER THE VALLEYS. SOUTHEAST UTAH AND SOUTHWEST COLORADO WILL HAVE A BETTER CHANCE OF AFTERNOON AND EVENING THUNDERSTORMS WITH LOCALIZED HEAVY RAINS. WEDNESDAY THROUGH SATURDAY...MOISTURE INCREASES DURING THIS PERIOD AND THUNDERSTORMS WILL BECOME MORE NUMEROUS...ESPECIALLY OVER THE HIGH TERRAIN. THE RISK OF HEAVY RAINS AND LOCALIZED FLASH FLOODING WILL INCREASE. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY OR TONIGHT. HOWEVER...REPORTS TO THE NATIONAL WEATHER SERVICE OF HEAVY RAIN... HAIL...AND ANY WEATHER RELATED DAMAGE WOULD BE GREATLY APPRECIATED.
The national radar mosaic for the moment the first event began.
1 heavy rain. Local standard time, as filed.
Thunderstorms produced rainfall of 1.20 inches in Cortez between 1325 and 1410 MST. The heavy rain caused street flooding in Cortez. The water was up to three feet deep on 5th Street.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Colorado in 2007Every state in 2007This day in weather historyWarnings in Colorado, July 2007
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: 55155.