This severe weather episode affected areas south of the Missouri River.
Every event with a place to put it. Tap one for its entry below.
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.
This severe weather episode affected areas south of the Missouri River.
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 Aug 9, 2:04 PM MST, 2 hours 26 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GLASGOW MT 304 PM MDT MON AUG 9 2010 .SHORT TERM...FOR NORTHEAST MONTANA...TONIGHT THROUGH WEDNESDAY... THUNDERSTORMS DEVELOPING OVER THE NORTHERN ROCKIES AND SPREADING NORTHEAST ARE ASSOCIATED WITH THE VORT MAX/SHORT WAVE EVIDENT IN THE WATER VAPOR IMAGERY AND 500 MB FIELD. MAJORITY OF THE FOCUS FOR THE SHORT TERM FORECAST WILL BE WITH TONIGHTS STORM SYSTEM PROGGED TO SPREAD THROUGH EASTERN MONTANA THROUGH THE EVENING AND OVERNIGHT HOURS. MODIFIED THESE GRIDS TO TRY AND SHOW AN APPROACHING AND DEPARTING GRADIENT OF POPS GRIDS AS THE SYSTEM MOVES THROUGH THE AREA BY TUESDAY MORNING. DETAILS FOR SEVERE WEATHER NOT EXACTLY ALIGNED...AS CERTAIN AREAS NEED DIFFERENT SEVERE WEATHER WORDING THAN OTHER AREAS. BETWEEN THE WEATHER GRIDS AND THE HWO...TRIED TO EXPLAIN THIS. TUESDAY THROUGH WEDNESDAY...LIMITED CHANCES FOR PRECIP ACROSS MOST OF THE CWA AS THE NEXT SYSTEM SETS UP TO IMPACT NE MONTANA BY THE END OF THE SHORT TERM FORECAST. BMICKELSON PREVIOUS SHORT TERM DISCUSSION...A WEST COAST UPPER TROUGH AND AN UPPER RIDGE OVER THE CENTRAL PLAINS WILL BACK FLOW ALOFT OVER EASTERN MONTANA TO THE SOUTHWEST TODAY. THIS WILL DIRECT MORE MOIST AND UNSTABLE AIR INTO THE REGION. IN ADDITION...A LEE SURFACE TROUGH OVER THE FORECAST AREA WILL GENERATE SOUTHEASTERLY WINDS WHICH WILL PULL IN SURFACE MOISTURE TO SEND DEW-POINTS INTO THE UPPER 50S IN THE EASTERN ZONES. AFTERNOON DISTURBANCES/SHORTWAVES IN THE UPPER FLOW AND A FLUCTUATING FRONTAL BOUNDARY NEAR PEAK HEATING SHOULD BE ENOUGH TO SET OFF ANOTHER ROUND OF THUNDERSTORMS INTO THE EVENING. ALTHOUGH INSTABILITY IS MODERATE...AN INVERTED-V SOUNDING PROFILE SUGGESTS STRONG WIND GUSTS ASSOCIATED WITH ANY DEVELOPING STORMS...WHICH COULD PUSH THEM INTO THE SEVERE CATEGORY. THESE CONDITIONS HAVE PROMPTED THE STORM PREDICTION CENTER TO INCLUDE ALL BUT OUR WESTERN COUNTIES IN THE SLIGHT RISK FOR SEVERE THUNDERSTORMS ON THEIR CONVECTIVE OUTLOOK FOR THIS AFTERNOON AND EVENING. THUNDERSTORMS WITH DIMINISHING CONVECTIVE STRENGTH SHOULD LAST PAST MIDNIGHT AND INTO TUESDAY MORNING AS THEY MOVE INTO CANADA AND NORTH DAKOTA. TUESDAY/WEDNESDAY...AFTER THE WAVE MOVES TOTALLY OUT OF THE AREA...UPPER FLOW VEERS TO THE WEST FOR SLIGHT RIDGING. IN ADDITION A SURFACE HIGH SLIDES OVER THE AREA FOR A RETURN TO WARM AND GENERALLY DRY CONDITIONS. HOWEVER WILL MAINTAIN A SLIGHT CHANCE FOR DIURNALLY DRIVEN POPS. SCT .LONG TERM...WEDNESDAY NIGHT THROUGH MONDAY... DPROG/DT FUNCTION FOR THE GFS WAS SHOWING THAT THE CLOSED UPPER LOW OVER THE PACIFIC NORTHWEST ON THURSDAY MORNING HAS BEEN MOVING EAST WITH EACH RUN. THE 1000-500 MB THICKNESS FIELD WAS FOLLOWING THIS TREND AS WELL. THUS COOLER TEMPERATURES WOULD RESULT FROM EARLIER THINKING. THE LATEST 12Z ECMWF ALSO FOLLOWS THIS TREND SO HAVE DECREASED TEMPS INTO THE 80S IN MOST AREAS WITH THE EXCEPTION BEING THE AREA ALONG AND SOUTHEAST OF THE YELLOWSTONE RIVER. WITH THE ABOVE MODEL CHANGES...POPS WERE ADJUSTED. THEY WERE INCREASED WEDNESDAY NIGHT THEN AGAIN THURSDAY NIGHT AND FRIDAY. JAMBA PREVIOUS DISCUSSION... A PATTERN CHANGE IS COMING UP LATER THIS WEEK WITH A TROF REPLACING A RIDGE OVER CENTRAL CANADA. MODELS COMING AROUND TO SIMILAR IDEA WITH THE RESULTING COOLER WEATHER INTO THE WEEKEND BRINGING A HINT OF AUTUMN TO THE NORTHERN PLAINS. THURSDAY AND FRIDAY...THE FIRST PORTION OF THE EXTENDED FORECAST HAS THE STRONGLY ROOTED RIDGE OVER THE CENTRAL US EBBING AWAY TO A LONG WAVE TROUGH OVER THE WESTERN STATES. THE LONG WAVE TROUGH WILL PUSH THE RIDGE FURTHER EAST INTO THE CENTRAL PLAINS AND THE MISSISSIPPI RIVER VALLEY...MEANWHILE A SHORT WAVE TROUGH MOVING THROUGH SOUTHERN CANADA WILL SEND A COLD FRONT DOWN INTO THE NORTHERN PLAINS. COOLER AIR WILL SLIDE INTO THE AREA THURSDAY NIGHT RESULTING A NOTICEABLE DROP IN HIGH TEMPS FOR FRIDAY. SHOWER AND THUNDERSTORM ACTIVITY IS POSSIBLE AHEAD OF THIS SYSTEM...CHANCES WILL INCREASE ESPECIALLY ACROSS NORTHERN ZONES ON FRIDAY TAPERING OFF DURING THE OVERNIGHT HOURS. AES SATURDAY THROUGH MONDAY...NORTHWEST FLOW CONTINUES WITH ANOTHER SHORTWAVE SLIDING ACROSS CENTRAL CANADA ON SUNDAY. ECMWF FURTHER WEST WITH THE WAVE THEN THE GFS AND HAS A LITTLE MORE MOISTURE WITH BACKDOOR FRONT SUNDAY AFTERNOON. SPLIT THE DIFFERENCE BY ADDING LOW POPS ALONG THE CANADIAN BORDER. TEMPERATURES WILL REMAIN ON THE COOL SIDE...JUST BELOW NORMAL...INTO EARLY NEXT WEEK. EBERT && .AVIATION... VFR CONDITIONS WILL FALL BELOW THIS LEVEL AT TIMES TONIGHT IN AREAS WHERE STRONG TO POSSIBLY SEVERE THUNDERSTORMS OCCUR. THE BEST CHANCES OF THIS HAPPENING ARE IN THE EASTERN AREAS WHERE BRIEF HEAVY RAIN WOULD BE THE GREATEST INGREDIENT IN LOWERING CONDITIONS. CONDITIONS ARE EXPECTED TO IMPROVE TUESDAY AS THE SYSTEM QUICKLY MOVES OFF TO THE NORTHEAST. && .GLASGOW WATCHES/WARNINGS/ADVISORIES...NONE. && WEATHER.GOV/GLASGOW
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GLASGOW MT 314 PM MDT MON AUG 9 2010 MTZ016-017-021>027-059>061-102115- CENTRAL AND SOUTHEAST PHILLIPS-CENTRAL AND SOUTHERN VALLEY- PETROLEUM-GARFIELD-MCCONE-RICHLAND-DAWSON-PRAIRIE-WIBAUX- NORTHERN PHILLIPS-SOUTHWEST PHILLIPS-NORTHERN VALLEY- 314 PM MDT MON AUG 9 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHEAST MONTANA. .DAY ONE...THIS AFTERNOON AND TONIGHT AN UPPER LEVEL DISTURBANCE WILL BRING NUMEROUS SHOWERS AND THUNDERSTORMS TO THE AREA TONIGHT AND THROUGH THE OVERNIGHT HOURS. SOME OF THE STRONGER STORMS MAY BECOME SEVERE WITH LARGE HAIL AND DAMAGING WINDS BEING THE MAIN THREATS. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. MTZ018>020-062-102115- DANIELS-SHERIDAN-WESTERN ROOSEVELT-EASTERN ROOSEVELT- 314 PM MDT MON AUG 9 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHEAST MONTANA. .DAY ONE...THIS AFTERNOON AND TONIGHT AN UPPER LEVEL DISTURBANCE WILL BRING NUMEROUS SHOWERS AND THUNDERSTORMS TO THE AREA TONIGHT AND THROUGH THE OVERNIGHT HOURS. SOME OF THE STRONGER STORMS MAY BECOME SEVERE WITH LARGE HAIL AND DAMAGING WINDS BEING THE MAIN THREATS. IN ADDITION TO THE GENERAL THREAT FOR SEVERE THUNDERSTORMS...THIS AREA HAS A GREATER POTENTIAL TO RECEIVE LOCALLY HEAVY RAINFALL AS THE STORMS MOVE NORTH AND EAST THROUGH THE REGION LATER TONIGHT. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
The Billings radar (KBLX), 102 km away, was scanning. The volume nearest the first event began at 23:31 UTC.
2 thunderstorm wind, 1 hail. Local standard time, as filed.
Around 70 mph wind blew over a large wooden shed and pushed it 500 feet away from it's foundation. The shed was 48 feet x 18 feet. It was 50 years old but still in good shape and was of solid construction.
Mixed in mostly with quarter size hail.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Montana in 2010Every state in 2010This day in weather historyWarnings in Montana, August 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: 247036, 247043, 247045.