A thunderstorm produced strong outflow winds near Mack.
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The episode as NWS GJT wrote it up.
A thunderstorm produced strong outflow winds near Mack.
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 Jun 17, 1:45 PM MST, 7 hours 8 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GRAND JUNCTION CO 245 PM MDT WED JUN 17 2009 .SHORT TERM...TONIGHT THROUGH FRIDAY... THROUGH TONIGHT... EXTENSIVE CLOUD COVER OVER OUR CWA HAS LIMITED THE SURFACE HEATING WHICH IN TURN HAS INHIBITED CONVECTION OVER OUR CWA TODAY. SURFACE GRADIENT WINDS AT MOST LOCATIONS HAVE NOT PANNED OUT TO BE QUITE AS STRONG AS EXPECTED BASED ON MORNING SOUNDING DATA AND MODEL FORECASTS. BELIEVE THE MAIN CONVECTIVE PERIOD FOR OUR CWA WILL BE LATE AFTERNOON AND EARLY EVENING HOURS DUE TO DELAY IN DAYTIME HEATING. DUE TO EXPECTED CLOUD COVER TONIGHT...HAVE RAISED MIN TEMPERATURES AT LEAST A FEW DEGREES FROM PREVIOUS GRIDS. THURSDAY... THURSDAY IS SHAPING UP TO BE A MORE ACTIVE WX DAY THAN TODAY AS SHORTWAVE TROUGH MOVING ACROSS NORTHERN TIER OF USA BRUSHES OUR CWA. IN GENERAL...EXPECT MOST SHOWERS AND THUNDERSTORMS TO BE ACROSS NORTHERN PORTION OF OUR CWA UNDER RELATIVELY WEAK BAROCLINIC ZONE. HAVE LOWERED MAX TEMPS MOST ZONES A LITTLE FROM PREVIOUS GRIDS MAINLY DUE TO ANTICIPATED EXTENSIVE CLOUD COVER. THURSDAY NIGHT AND FRIDAY... SHORTWAVE TROUGH MOVES OUT OF OUR AREA THURSDAY NIGHT FOLLOWED BY MIGRATORY UPPER RIDGE ON FRIDAY. EXPECT A DRYING TREND...AS WELL AS A NOTICEABLE WARMING TREND. MOST LOCATIONS IN OUR CWA WILL LIKELY EXPERIENCE A 3 TO 5 DEGREE F RISE IN MAX TEMPERATURES ON FRIDAY VERSUS TOMORROW. TOWARDS LATE FRIDAY...AS UPPER RIDGE SHIFTS EAST LEAVING OUR CWA UNDER A SOUTHERLY FLOW EXPECT SOME MOISTURE TO BEGIN SPREADING UP FROM THE SOUTH...AND HAVE INCREASED CLOUD COVER A LITTLE OVER ZONES IN 4 CORNERS AREA. .LONG TERM...FRIDAY NIGHT THROUGH WEDNESDAY... MODELS CONTINUE TO PAINT AN ACTIVE AND MOIST SATURDAY AS A SHORTWAVE EJECTS OFF THE WESTERN U.S. TROUGH AND PASSES OVER THE AREA...AS MOISTURE SURGES UP FROM THE SOUTH. HAVE AGAIN TRENDED POPS UPWARDS BEGINNING LATE FRI NIGHT AS PRECIPITABLE WATER VALUES REACH .75 INCHES OR MORE OVER MOST OF THE AREA BY SAT AFTERNOON. I ALSO LOWERED HIGH TEMPS A LITTLE TO ACCOUNT FOR THE INCREASED PCPN/CLOUDS. HOWEVER DID NOT GO AS FAR AS TODAYS MUCH COOLER MEX GUIDANCE NUMBERS AT MOST LOCATIONS...WHICH WERE ABOUT 10 DEGREES BELOW NORMAL. THIS FEATURE QUICKLY MOVES EAST OF THE AREA ON SUNDAY WITH A DRIER AND WARMER REGIME FOLLOWING FOR THE REMAINDER OF THE FORECAST PERIOD. THE LARGE SCALE WESTERN U.S. TROUGH/CENTRAL U.S. RIDGE WILL PERSIST INTO MIDWEEK AT LEAST. BUT THE RIDGE DOES AMPLIFY AND SHIFT WESTWARD A LITTLE THROUGH THE PERIOD. WHILE PREVIOUS RUNS ALSO SHOWED THE NEXT WORK WEEK DRIER...TODAYS RUNS ARE EVEN MORE SO. MEX GUIDANCE HIGHS AGAIN TRY TO BRING GJT INTO THE 90S EACH AFTERNOON...UP A COUPLE DEGREES OVER YESTERDAYS NUMBERS. I DID INCREASE THE TEMPS A LITTLE...BUT DID NOT MESS WITH THE ALREADY LOW CHANCE MOUNTAIN POPS DUE TO THE LACK OF CHANGE IN THE LARGE SCALE PATTERN. && .AVIATION... SCATTERED SHOWERS AND A FEW THUNDERSTORMS WILL CONTINUE INTO THIS EVENING ACROSS THE AREA...MAINLY OVER THE NORTHERN AND CENTRAL MOUNTAINS. GUSTY OUTFLOW WINDS WILL CONTINUE TO BE THE PRIMARY THREAT. SHOWERS AND THUNDERSTORMS ARE EXPECTED TO INCREASE IN COVERAGE THURSDAY...WITH LOCALIZED MVFR CONDITIONS POSSIBLE IN SOME OF THE HEAVIER SHOWERS OVER NE UT AND NW CO. && .GJT WATCHES/WARNINGS/ADVISORIES... .CO...NONE. .UT...NONE. SHORT TERM.....JRP LONG TERM......EH AVIATION.......JRP
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GRAND JUNCTION CO 600 AM MDT WED JUN 17 2009 COZ001>014-017>023-UTZ022>025-027>029-181200- 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 WED JUN 17 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN UTAH AND WESTERN COLORADO. .DAY ONE...TODAY AND TONIGHT... SCATTERED AFTERNOON AND EARLY EVENING SHOWERS AND THUNDERSTORMS WILL FOCUS MAINLY NORTH OF INTERSTATE 70 AND THE CENTRAL MOUNTAINS OF COLORADO.ISOLATED THUNDERSTORMS WILL OCCUR OVER THE SOUTHERN MOUNTAINS. THE STRONGER STORMS WILL PRODUCE GUSTY WINDS...SMALL HAIL AND BRIEF HEAVY RAINFALL. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY... SCATTERED AFTERNOON THUNDERSTORMS WILL DEVELOP EACH DAY OVER THE MOUNTAINS...BUT ONLY A FEW STORMS WILL IMPACT VALLEY AREAS. A DRYING AND WARMING TREND IS EXPECTED FOR THE UPCOMING WEEKEND. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY OR TONIGHT.
The Grand Junction radar (KGJX), 66 km away, was scanning. The volume nearest the first event began at 03:51 UTC.
1 thunderstorm wind. Local standard time, as filed.
Strong thunderstorm outflow winds blew down and tossed unsecured property.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Colorado in 2009Every state in 2009This day in weather historyWarnings in Colorado, June 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: 180857.