A severe thunderstorm produced very strong outflow winds.
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The episode as NWS GJT wrote it up.
A severe thunderstorm produced very strong outflow winds.
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, 1:06 PM MST, 39 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GRAND JUNCTION CO 206 PM MDT TUE JUL 28 2009 .SHORT TERM...TODAY THROUGH THURSDAY NIGHT... CURRENT WATER VAPOR SHOWING SMALL FINGER OF JET STREAM MOVING OVER UT/CO THAT MATCHES UP NICELY WITH NAM. IN RESPONSE...STRONG TSTMS HAVE FIRED OVER SERN UT/SWRN CO THIS AFTN. TO THE NORTH...MINOR SHORTWAVES ALSO MOVING THRU NW FLOW OVER PORTIONS OF CO/UT AND VISIBLE SATELLITE SHOWING SOME CUMULUS FORMING IN RESPONSE. HAVE INCREASED TSTM COVERAGE FOR MOST OF CWFA AS THE ODD POP UP COULD OCCUR JUST ABOUT ANYWHERE THIS AFTN. HAVING SAID THAT...ATMOSPHERE IN NRN AREAS IS MORE STABLE THAN IT HAS BEEN SO COVERAGE SHOULD BE LESS THAN SEEN LATELY. MOST CONVECTION WILL END BY MIDNIGHT GIVING WAY TO CLEAR SKIES. DEEP ANOMALOUS CLOSED LOW OVER SRN CAN CONTINUES TO AFFECT WX FOR ALMOST ENTIRE NATION. CYCLONIC FLOW OVER UT/CO WILL CONTINUE TO DRAW IN DISTURBANCES THOUGH WITH NW FLOW...TEMPS SHOULD BE MORE SEASONAL. NEXT TROUGH WILL MOVE THRU WED AFTN/EVENING WITH CONTINUED AFTN CONVECTION FOR GENERALLY NRN AND ERN AREAS. PACKING IN THICKNESSES GIVES IDEA OF A FRONT...THAT WASHES OUT JUST AS IT ENTERS NRN CO. STATISTICAL GUIDANCE ONLY DROPS TEMPS/DWPTS AROUND AREA BY 3 TO 5 DEG AT MOST THURSDAY AND REBOUNDS QUICKLY THE NEXT DAY SO NO REAL CHANGE TO WX. UPPER LEVEL SUPPORT FOR TROUGH WILL HAVE MOVED TO THE PLAINS BY THUR. WEAK RIDGING WILL TRY AND BUILD IN ON THUR BUT CONTINUED INSTABILITY...AND SHORTWAVES WILL CONTINUE TO MOVE THRU FLOW. THUS...KEPT SCHC TO CHC TSTMS FOR FAVORED AREAS. TEMPS WILL BE NORMAL THRU THURSDAY NIGHT. .LONG TERM...THURSDAY NIGHT THROUGH TUESDAY... GENERAL TROUGH PATTERN OVER THE NORTHERN PLAINS KEEPS NORTHWESTERLY FLOW ALOFT OVER EASTERN UT AND WESTERN CO THROUGH THE END OF THE WEEK. HIGH PRESSURE WILL CONTINUE TO BE SHUNTED SOUTH OVER NORTHERN MEXICO AND FAR WEST TX. ANOTHER PAC LOW SLOWLY PUSHES EAST AND HELPS TO AMPLIFY THE RIDGE AXIS OVER THE WESTERN USA. BY THE WEEKEND THE NORTHERN TROUGH MOVES EAST ALLOWING THE HIGH TO PUSH NORTHWARD AND BLOCK THE PROGRESSION OF THE PAC LOW. THE EURO CONTINUES TO RETROGRADE THE LOW BACK OVER THE PAC ALTHOUGH THE GFS STALLS THE LOW ALONG THE COAST. THE RIDGE STRENGTHENS EARLY NEXT WEEK WITH THE AXIS ORIENTED NORTH SOUTH OVERHEAD. MOISTURE DECREASES THIS WEEK AS A DRIER AIRMASS FILTERS INTO THE REGION. LEFT A FEW SHOWERS AND AN ISOLATED THUNDERSTORM OVER THE HIGH MOUNTAINS MAINLY NEAR THE DIVIDE FOR FRIDAY. AND THEN EVEN LESS COVERAGE ON SATURDAY. A WEAK DISTURBANCE AND ASSOCIATED COLD FRONT SLIDES SOUTH OVER THE NORTHEASTERN PART OF THE FORECAST AREA. EXPECT SLIGHT INCREASE OF POPS OVER THE AREA SUNDAY AFTERNOON AND EVENING. MODELS CONTINUE TO INDICATE MOISTURE LINGERING AND SLOWLY MOVING NORTHWARD INTO THE AREA UNDER THE RIDGE. WILL START TO INCREASE POPS MAINLY OVER THE HIGHER TERRAIN FOR THE EARLY PART OF NEXT WEEK. TEMPERATURES WILL INCREASE UNDER THE RIDGE. && .AVIATION... VFR TO CONTINUE FOR NEXT 24 HOURS. AS USUAL...MVFR UNDER HEAVIER SHOWERS AND TSTMS...ESPECIALLY IN SRN AREAS. MOST STORMS WILL HAVE MOVED OFF BY MIDNIGHT. && .GJT WATCHES/WARNINGS/ADVISORIES... .CO...NONE. .UT...NONE. SHORT TERM.....TGR LONG TERM......AS AVIATION.......TGR
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GRAND JUNCTION CO 600 AM MDT TUE JUL 28 2009 COZ001>014-017>023-UTZ022>025-027>029-291200- 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- 600 AM MDT TUE JUL 28 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN UTAH AND WESTERN COLORADO. .DAY ONE...TODAY AND TONIGHT... SCATTERED THUNDERSTORMS WILL FORM OVER THE MOUNTAINS OF WESTERN COLORADO. SOME OF THESE STORMS WILL MOVE OFF THE MOUNTAINS AND AFFECT THE VALLEYS OF SOUTHEAST UTAH AND SOUTHWEST COLORADO. LOCALIZED BRIEF HEAVY SHOWERS WITH SMALL HAIL WILL BE POSSIBLE. GUSTY WINDS WILL BE COMMON WITH STORMS. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY... WEDNESDAY AND THURSDAY...EXPECT SCATTERED SHOWERS AND THUNDERSTORMS WITH LOCALIZED BRIEF HEAVY SHOWERS AND SMALL HAIL. GUSTY WINDS WILL BE COMMON WITH THUNDERSTORMS. FRIDAY THROUGH MONDAY...ISOLATED AFTERNOON AND EARLY EVENING THUNDERSTORMS WILL FORM OVER THE MOUNTAINS EACH DAY. A FEW OF THESE STORMS WILL DRIFT OVER THE VALLEYS...ACCOMPANIED BY GUSTY WINDS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY OR TONIGHT.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GRAND JUNCTION CO 153 PM MDT TUE JUL 28 2009 UTZ022-028-029-282030- CANYONLANDS/NATURAL BRIDGES UT-LA SAL AND ABAJO MOUNTAINS UT-SOUTHEAST UTAH UT- 153 PM MDT TUE JUL 28 2009 ...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL SAN JUAN COUNTY UNTIL 230 PM MDT... AT 149 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 6 MILES SOUTH OF FRY CANYON...OR 31 MILES NORTH OF MEXICAN HAT...MOVING EAST AT 20 MPH. HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 40 MPH ARE POSSIBLE WITH THIS STORM...ALONG WITH HEAVY RAIN AND FREQUENT DANGEROUS LIGHTNING. THIS STORM WILL BE NEAR... NATURAL BRIDGES NATIONAL MONUMENT BY 200 PM MDT. RURAL CENTRAL SAN JUAN COUNTY THROUGH 230 PM MDT. IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A STURDY BUILDING. 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. MCS
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GRAND JUNCTION CO 231 PM MDT TUE JUL 28 2009 UTZ022-029-282115- CANYONLANDS/NATURAL BRIDGES UT-SOUTHEAST UTAH UT- 231 PM MDT TUE JUL 28 2009 ...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL SAN JUAN COUNTY UNTIL 315 PM MDT... AT 230 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 13 MILES NORTHWEST OF BLUFF AIRPORT...OR 17 MILES NORTH OF MEXICAN HAT...MOVING EAST AT 25 MPH. HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN AND FREQUENT DANGEROUS LIGHTNING. THIS STORM WILL BE NEAR... BLUFF AIRPORT AROUND 255 PM MDT. BLUFF AROUND 305 PM MDT. IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A STURDY BUILDING. 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. MCS
The Grand Junction radar (KGJX), 231 km away, was scanning. The volume nearest the first event began at 20:46 UTC.
1 thunderstorm wind. Local standard time, as filed.
Strong thunderstorm winds blew down some old trees and broke off large branches from other trees throughout the town of Bluff.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Utah in 2009Every state in 2009This day in weather historyWarnings in Utah, July 2009
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: 175800.