A cold front provided the focus for developing thunderstorms in an unstable atmsophere - one of which became severe during the late night hours.
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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 provided the focus for developing thunderstorms in an unstable atmsophere - one of which became severe during the late night hours.
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 29, 9:14 PM MST, 1 hour 36 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GLASGOW MT 1014 PM MDT THU AUG 29 2013 .SHORT TERM...FOR NORTHEAST MONTANA...TONIGHT THROUGH SATURDAY... 1015PM UPDATE... A LINE OF SHOWERS AND THUNDERSTORMS IS HOLDING TOGETHER VERY WELL ACROSS CENTRAL MONTANA AT THIS TIME AND IS PUSHING EAST. WIND GUSTS IN EXCESS OF 70 MPH HAVE BEEN OBSERVED IN A FEW LOCATIONS. WILL UPDATE THE FORECAST FOR THE OVERNIGHT TO EXPAND ISOLATED POPS FURTHER EAST. ALSO RAISED POPS IN THE WEST TO BETTER REFLECT RADAR TRENDS. GIVEN RECENT DEVELOPMENTS...WILL INCLUDE PETROLEUM AND NORTHERN VALLEY COUNTIES IN A SEVERE MENTION DUE TO DAMAGING WINDS. ALSO EXPANDED AREAL COVERAGE OF GUSTY WINDS TO ADDITIONAL PARTS OF THE CWA WITH THIS UPDATE. FOR THE MORNING HOURS THE ACTIVITY SHOULD BE CONFINED TO THE EASTERN PORTIONS OF THE CWA AND IT SHOULD BE BELOW SEVERE INTENSITY AT THAT TIME. WILL CONTINUE TO MONITOR OVERNIGHT AND PRESENT THE LATEST THINKING WITH THE MORNING PACKAGE. MALIAWCO 830PM UPDATE... INCREASED POPS TO INCLUDE MENTION OF SCATTERED SHOWERS AND THUNDERSTORMS ACROSS ESPECIALLY THE WESTERN ZONES TONIGHT. FAIRLY STEADY BAND OF SHOWERS AND THUNDERSTORMS ACROSS CENTRAL MONTANA WILL GRADUALLY MARCH EASTWARD AND AFFECT THE CWA MAINLY AFTER MIDNIGHT. GUSTY WINDS ARE ALSO POSSIBLE IN SOME LOCATIONS IF THEY MAINTAIN PRESENT INTENSITY. WILL INCLUDE THIS MENTION FOR MAINLY PHILLIPS/PETROLEUM COUNTIES. WHATEVER SURVIVES OF THIS ACTIVITY WILL THEN MOVE THROUGH TO THE EASTERN HALF OF THE CWA BY MORNING. OTHERWISE MADE MINOR TWEAKS TO FORECAST LOW TEMPERATURES AND MADE MINOR TWEAKS TO SKY COVER AND WINDS BASED ON LATEST TRENDS AND OBSERVATIONS AS WELL AS TAKING INTO CONSIDERATION LATEST MODEL GUIDANCE. MALIAWCO PREVIOUS SHORT TERM DISCUSSION... WATER VAPOR IMAGERY AND 500 MB HEIGHT FIELD SHOWS THE RE-BUILDING SHORT-WAVE RIDGE OVER MONTANA WHICH CONTRIBUTED TO A DRY...HOT...AND CALM DAY TODAY. BUT THE LARGE CLOSED UPPER-LEVEL LOW OFF THE PACIFIC NORTHWEST COAST IS EXTENSIVE ENOUGH THAT ITS EASTERN FLANK CARRIES ENOUGH ENERGY WITH IT TO SPREAD SOME ISOLATED THUNDERSTORMS AS FAR EASTWARD AS OUR WESTERN ZONES TONIGHT...THEN ACROSS OUR NORTHERN ZONES THROUGH EARLY FRIDAY MORNING. MODELS NOT IN EXCELLENT AGREEMENT WITH PRECIP COVERAGE. A SHIFT IN THE WINDS FROM THE NORTHWEST OCCURS LATE FRIDAY AS THE PACIFIC NORTHWEST UPPER LOW VERY QUICKLY TRAVERSES THE ROCKY MOUNTAINS AS AN OPEN WAVE...PUSHING SCATTERED SHOWERS AND THUNDERSTORMS AHEAD OF IT THROUGH THE WEEKEND. THE STRONGEST WINDS OF THE COLD FRONT SEEM TO BE SUSTAINED AROUND 25 MPH AND GUSTING TO 35 MPH FROM LATE SATURDAY MORNING THROUGH SATURDAY AFTERNOON. A LAKE WIND ADVISORY MAY BE NEEDED AND I WOULD DEFER TO FUTURE SHIFTS TO BETTER FINE TUNE THAT TIMING BEFORE ISSUING IT. EXPECT A DAILY DROP IN HIGH TEMPERATURES FROM FRIDAY TO SATURDAY OF 10 TO 15 DEGREES. THIS WILL KEEP HIGHS THROUGH THE REMAINDER OF THE WEEKEND IN 70S AND 80S. FIRE WEATHER CONCERNS SHOULD NOT BE AN ISSUE WITH THESE WINDS AS THE COLD FRONT WILL RAISE MINIMUM HUMIDITIES TO ABOVE 30 PERCENT. STILL SOMETHING TO KEEP IN MIND...THOUGH. MICKELSON .LONG TERM...SATURDAY NIGHT THROUGH THURSDAY... GOING FORECAST IN GOOD SHAPE. DID INCREASE WINDS A BIT FOR SATURDAY EVENING AND LOWERED TEMPERATURES A NOTCH FOR SUNDAY. MODELS STARTING TO SHOW A STRONGER SYSTEM TO AFFECT MONTANA ABOUT THURSDAY/THURSDAY NIGHT. MUCH OF THE SHOWER ACTIVITY LOOKS TO STAY TO OUR NORTH BUT COOLER TEMPS WITH WINDS AND POSSIBLY LIGHT SHOWERS LOOK TO IMPACT THE AREA. TFJ PREVIOUS DISCUSSION... UPPER RIDGE BUILDS BACK INTO THE AREA SUNDAY AND MONDAY WITH WARMING TREND AND DRY WEATHER. LABOR DAY WILL HAVE TEMPERATURES NEAR 90. MODELS HAVE A SHORTWAVE OVERTOPPING THE RIDGE ON TUESDAY WITH THE POSSIBILITY OF SOME MONSOONAL MOISTURE IN THE AREA. WILL MAINTAIN A SLIGHT CHANCE OF THUNDERSTORMS. MODELS MAINTAIN UPPER RIDGE OVER THE AREA ON WEDNESDAY AND THURSDAY. HOWEVER...A DEEPENING UPPER TROUGH TO THE EAST MAY ALLOW FOR A BACK DOOR COLD FRONT ACROSS NORTHEAST MONTANA ON WEDNESDAY. MODELS ARE NOT IN AGREEMENT WITH THIS FRONT. WILL MAINTAIN A SLIGHT CHANCE OF THUNDERSTORMS ON WEDNESDAY FOR NOW. FORRESTER && .AVIATION... VFR. A FEW THUNDERSTORMS FROM WESTERN MONTANA COULD MOVE INTO THE REGION AFTER 06Z...HOWEVER PROBABILITY IS TOO SMALL TO ADD TO THE TERMINALS AT THIS TIME. OTHERWISE... VFR...WITH AFTERNOON AND EVENING THUNDERSTORMS POSSIBLE AGAIN FOR TOMORROWS FLYING DAY. PROTON && .GLASGOW WATCHES/WARNINGS/ADVISORIES...NONE. && WEATHER.GOV/GLASGOW
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GLASGOW MT 250 PM MDT THU AUG 29 2013 MTZ016>027-059>062-302100- 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- 250 PM MDT THU AUG 29 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHEAST MONTANA. .DAY ONE...THIS AFTERNOON AND TONIGHT NO HAZARDOUS WEATHER EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY BEGINNING ON SATURDAY...A STRONG COLD FRONT FROM THE NORTHWEST WILL ALLOW SUSTAINED WIND SPEEDS OF 15 TO 25 MPH TO SPREAD ACROSS NORTHEAST MONTANA WITH SOME GUSTS UP TO 35 MPH. A LAKE WIND ADVISORY FOR FORT PECK LAKE MAY BE NEEDED. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
The Glasgow radar (KGGW), 149 km away, was scanning. The volume nearest the first event began at 05:48 UTC.
1 thunderstorm wind. Local standard time, as filed.
A wind gust of 74 mph was recorded at the Manning Corral Dogtown RAWS site.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Montana in 2013Every state in 2013This day in weather historyWarnings in Montana, August 2013
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: 475514.