A cold front touched off a severe thunderstorm in northern Valley 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 GGW wrote it up.
A cold front touched off a severe thunderstorm in northern Valley 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 Glasgow, MT wrote its last area forecast discussion before the first event at Jul 24, 1:01 PM MST, 3 hours 59 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GLASGOW MT 201 PM MDT TUE JUL 24 2007 .SHORT TERM...FOR NORTHEAST MONTANA...TONIGHT THROUGH THURSDAY... RECORD BREAKING HEAT TO COME TO AND END TODAY. WELCOMING COOL AIRMASS SEEN MOVING SOUTHEAST INTO S ALBERTA. SATELLITE IMAGERY SHOWING STRONG MONSOONAL TAP OF MOISTURE FROM SOUTHWEST MT INTO THE PRAIRIE PROVINCES. A WEAK SURFACE TROUGH IS EXPECTED TO DEVELOP THIS AFTERNOON/EVENING OVER THE WESTERN ZONES THEN MOVE SOUTHEAST. 850 MB WINDS UP TO 40 KTS WILL PARTIALLY MIX DOWN THANKS TO COLD AIR ADVECTION AND MODERATE LAPSE RATES IN THE LOWER LEVELS. WOULDN/T BE SURPRISED TO SEE GUSTS TO AROUND 40-45 MPH ACROSS FORT PECK LAKE THIS EVENING. THEREFORE...WILL ISSUE A LAKE WIND ADVISORY TO ACCOUNT FOR THIS. A SECONDARY COLD FRONT OVER SOUTHERN ALBERTA WILL DROP SOUTHEAST INTO THE AREA WEDNESDAY BUT STALL AND KEEP THE AREA CLOUDY. THESE CLOUDS SHOULD ONLY ALLOW TEMPS TO REACH THE 80S TO LOWER 90S. CONVERGENCE LOOKS TO OCCUR LATER TONIGHT OVER E ID. THE MODELS MOVE THIS SYSTEM EAST OR NORTHEAST. HOWEVER THE MODELS ARE HAVING A TOUGH TIME WITH THIS SYSTEM. THE GFS SPREADS LOTS OF QPF ACROSS THE SOUTHERN ZONES WHILE THE NAM KEEPS IT MUCH DRIER. OPPOSITE TO WHAT THEY WERE DOING YESTERDAY...SO CONFIDENCE NOT VERY HIGH AT THIS TIME. THE SYSTEM MOVES EAST INTO THE DAKOTAS EARLY THURSDAY AS THE UPPER RIDGE REBOUNDS OVER THE NORTHERN ROCKIES. SURFACE HIGH PRESSURE OVER THE AREA SHOULD ALLOW FOR MORE SUNSHINE FOR THURSDAY...AND THAT WILL ALLOW FOR LIGHT WINDS AND TEMPS TO BE A BIT WARMER. JAMBA .LONG TERM...THURSDAY NIGHT THROUGH TUESDAY... THERE WAS NOTHING NEW WITH THE LATEST EXTENDED MODELS AND ENSEMBLES THAT WOULD INSPIRE THIS FORECASTER TO MODIFY THE INHERITED FORECAST. AS REMARKED IN THE HPC FINAL EXTENDED DISCUSSION...MODELS CONTINUE IN GOOD LARGE SCALE AGREEMENT AND GOOD CONTINUITY. UPPER RIDGE REBOUNDS AFTER CANADIAN UPPER TROUGH SHIFTS EAST TOWARDS HUDSON BAY. A GULF OF ALASKA UPPER LOW WILL SLIDE SOUTH ALONG THE WEST COAST OF CANADA AND THE NORTHWEST WHICH WILL FURTHER AMPLIFY THE UPPER RIDGE LOCALLY THROUGH THE WEEKEND. BY EARLY NEXT WEEK THE GULF LOW WILL BEGIN TO MOVE ACROSS WESTERN CANADA WHICH WILL FLATTEN THE RIDGE AND LOWER HEIGHTS. THE OVERALL RESULT OF THIS PATTERN WILL BE INCREASING TEMPERATURES OVER THE WEEKEND THEN SLIGHTLY COOLER TEMPERATURES BY EARLY NEXT WEEK. UPPER FLOW IS NOT CLEAN SO CAN EXPECT DISTURBANCES WHICH COULD GENERATE AFTERNOON AND EVENING CONVECTION THROUGH MOST OF THE PERIOD. GRID EDITS WERE FEW AND MAINLY FOR COORDINATION PURPOSES. SCT PREVIOUS DISCUSSION... A VERY TYPICAL MID-SUMMER LOOKING PATTERN WITH CONTINUED HOT TEMPERATURES AND MOSTLY DRY WEATHER. STRONG HIGH PRESSURE ALOFT REMAINS DOMINATE OVER THE WESTERN AND PLAINS STATES. MODELS ARE IN GOOD AGREEMENT AND OFFER LITTLE CHANGE FROM PREVIOUS RUNS. THE UPPER HIGH WILL BE CENTERED FARTHER SOUTH THAN THE CURRENT PATTERN THAT HAS BEEN PRODUCING RECORD HEAT THOUGH. THICKNESSES ARE MAINLY IN THE 575-585 DM RANGE AND 850 MB TEMPS 20-28C...SO THE HEAT WILL NOT BE EXTREME...MAINLY UPPER 80S AND 90S. A CLOSED LOW ALOFT MOVES EAST FROM THE GULF OF ALASKA THRU WESTERN CANADA DURING THE PERIOD. THIS CAUSES AN INCREASE IN UPPER FLOW FROM THE SW IN OUR AREA LATER IN THE PERIOD AS THE UPPER HIGH IS DEPRESSED A LITTLE SE. MODELS LOOK RATHER DRY WITH THIS PATTERN WITH LITTLE INDICATION OF ANY SIGNIFICANT SHORTWAVES OR MOISTURE. MODELS DONT HANDLE SUBTROPICAL INPUT WELL THOUGH...AND EXPECT THERE WILL BE A FEW VERY ISOLATED THUNDERSTORMS DURING THE EVENING HOURS IN SOME OF THE PERIODS. WILL KEEP POPS MINIMAL...MOSTLY IN THE 10 PCT RANGE AT NIGHT TO REFLECT THIS...WHICH WON/T SHOW IN TEXT PRODUCT WORDING. SIMONSEN && .AVIATION... GENERALLY VFR. A COLD FRONT WILL SWEEP INTO THE AREA LATE THIS AFTERNOON AND EVENING...WHICH WILL KICK OFF ANOTHER ROUND OF CONVECTIVE ACTIVITY. THIS EVENING...SURFACE WINDS FROM THE SOUTH WILL SHIFT TO THE NORTHWEST BEHIND THE FRONT AND INCREASE TO 20 TO 25 KNOTS WITH HIGHER GUSTS. THE STRONGEST WINDS WILL BEGIN IN WESTERN ZONES THEN MOVE EAST OVERNIGHT. VISIBILITIES AND CEILINGS WILL POSSIBLY DROP TO MVFR AND IFR AROUND ANY OF THE STORMS. IN ADDITION...STRONG GUSTY WINDS ARE POSSIBLE NEAR ANY THUNDERSTORM. SCT && .FIRE WEATHER... HOT AND DRY AIRMASS OF TODAY WILL GRADUALLY BECOME WET AND A BIT COOLER BY WEDNESDAY NIGHT. THUNDERSTORMS WILL CROSS THE AREA TONIGHT. GUSTY WINDS WILL ACCOMPANY A FRONT THIS EVENING ESPECIALLY ZONES 119 AND 121. && .GLASGOW WATCHES/WARNINGS/ADVISORIES... LAKE WIND ADVISORY FROM 6 PM THIS EVENING TO MIDNIGHT MDT TONIGHT FOR FORT PECK LAKE. && WEATHER.GOV/GLASGOW
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GLASGOW MT 217 PM MDT TUE JUL 24 2007 MTZ016>027-059>062-251200- CENTRAL AND SOUTHEAST PHILLIPS-CENTRAL AND SOUTHERN VALLEY- DANIELS-SHERIDAN-WESTERN ROOSEVELT-PETROLEUM-GARFIELD-MCCONE- RICHLAND-DAWSON-PRAIRIE-WIBAUX-NORTHERN PHILLIPS- SOUTHWEST PHILLIPS-NORTHERN VALLEY-EASTERN ROOSEVELT- 217 PM MDT TUE JUL 24 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHEAST MONTANA. .DAY ONE...THIS AFTERNOON AND TONIGHT A LAKE WIND ADVISORY IS IN EFFECT FOR THIS EVENING FOR FORT PECK LAKE. NORTHWEST WINDS OF 15 TO 25 MPH WITH GUSTS TO 40 MPH ARE EXPECTED WITH A COLD FRONTAL PASSAGE. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY NO HAZARDOUS WEATHER EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. TFJ
The Glasgow radar (KGGW), 90 km away, was scanning. The volume nearest the first event began at 00:02 UTC.
2 thunderstorm wind. Local standard time, as filed.
A large border crossing sign was blown over by the strong wind. The wind was accompanied by pea to penny size hail.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Montana in 2007Every state in 2007This day in weather historyWarnings in Montana, 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: 35774, 35771.