A cluster of storms developed during the afternoon over Gallatin and Fergus Counties. Damage was reported near Bozeman, MT.
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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 TFX wrote it up.
A cluster of storms developed during the afternoon over Gallatin and Fergus Counties. Damage was reported near Bozeman, MT.
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 Great Falls, MT wrote its last area forecast discussion before the first event at Jun 20, 1:57 PM MST, 2 hours 33 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GREAT FALLS MT 257 PM MDT WED JUN 20 2007 .DISCUSSION... TONIGHT...AN UPPER LEVEL DISTURBANCE WILL MOVE THROUGH THE SOUTHWEST AND CENTRAL AREA OF CWA LATE THIS AFTERNOON AND TONIGHT FOR SCATTERED THUNDERSTORMS. SOME OF THESE MAY BECOME SEVERE WITH THE MAIN THREAT BEING STRONG WINDS. A SEVERE THUNDERSTORM WATCH HAS BEEN ISSUED FOR THE SOUTHWEST AND PORTIONS OF CENTRAL MONTANA. WARM TEMPERATURES CAN BE EXPECTED AGAIN THURSDAY AS THE UPPER LEVEL RIDGE CONTINUES OVER THE AREA. UPPER LEVEL RIDGE WILL MOVE OVER THE EASTERN PORTION OF THE STATE THURSDAY NIGHT AND FRIDAY. UPPER LEVEL SHORT WAVES TO MOVE THROUGH THE FLOW FOR ISOLATED AFTERNOON SHOWERS AND THUNDERSTORMS. WILL CONTINUE WITH WARM TEMPERATURES THROUGH THE PERIOD. CAMP FRIDAY NIGHT THROUGH MONDAY NIGHT...FAIRLY GOOD MODEL RUN-TO-RUN CONSISTENCY CONTINUES TO INDICATE AN UPPER LEVEL RIDGE BEING PUSHED TOWARD THE CENTRAL STATES AS A UPPER LEVEL TROUGH DEEPENS ALONG THE WEST COAST. THE LOW PUSHES INTO THE PACIFIC NORTHWEST ON SUNDAY...A LITTLE FURTHER SOUTH THAN PROGGED LAST NIGHT. THE LOW LIFTS NORTHEASTWARD INTO THE PRAIRIE PROVINCES KEEPING MOST OF ITS ENERGY NORTH OF THE AREA. HAVE CONTINUED TO HOLD THE COURSE WITH SLIGHT CHANCE POPS FOR THE DISTURBANCES IN THE SOUTHWEST FLOW ALOFT EARLY IN THE PERIOD AND THEN AS THE LOW MOVES INLAND. THERE SHOULD BE SOME GOOD MOISTURE WITH THE PACIFIC LOW SO IF IT DOES END UP DROPPING FURTHER SOUTH COULD SEE A MORE SIGNIFICANT CHANCE OF PRECIP...WILL CONTINUE TO WATCH THIS SYSTEM. TEMPERATURES WILL BE ABOVE NORMAL SATURDAY...DROPPING TO NORMAL VALUES FOR THE REST OF THE PERIOD AS COOLER AIR FILTERS IN WITH THE TROUGH AND BEHIND A SURFACE COLD FRONT. THOMSON TUESDAY THROUGH WEDNESDAY...AN UPPER LEVEL RIDGE OF HIGH PRESSURE OVER THE CENTRAL PLAINS...IS PROGGED TO RETROGRADE TOWARDS THE FOUR CORNERS AREA WITH THE RIDGE EXTENDING NORTH ACROSS MONTANA. TEMPERATURES WILL BE A LITTLE WARMER THAN SEASONAL AVERAGE. IT WILL BE MOSTLY DRY...EXCEPT FOR ISOLATED...MAINLY MOUNTAIN THUNDERSTORMS. WILLIAMSON DC && .AVIATION... UPDATED 1740Z. AN UPPER LEVEL RIDGE CENTERED OVER THE NORTHERN ROCKIES WILL RESULT IN A WESTERLY FLOW ALOFT FOR THE NEXT 24 HOURS. AN UPPER LEVEL DISTURBANCE PASSING THROUGH THE RIDGE COMBINED WITH AN UNSTABLE AIRMASS WILL TRIGGER SCATTERED THUNDERSTORMS THIS AFTERNOON AND THIS EVENING. VFR CONDITIONS WILL PREVAIL EXCEPT MVFR NEAR THE STRONGER THUNDERSTORMS. GUSTY WINDS WILL LIKELY ACCOMPANY THE THUNDERSTORMS. MOSTLY CLEAR SKIES WILL PREVAIL AFTER MIDNIGHT AS THE STORMS DISSIPATE AND EXIT THE AREA. MEIER && .PRELIMINARY POINT TEMPS/POPS... GTF 56 88 56 88 / 30 10 20 10 CTB 56 85 52 85 / 10 10 10 10 HLN 57 87 57 91 / 30 10 10 10 BZN 55 89 55 91 / 40 10 10 10 WEY 39 79 40 83 / 20 10 10 10 DLN 50 85 48 87 / 30 10 10 10 HVR 58 89 56 87 / 10 10 10 10 LWT 55 83 55 85 / 40 10 20 10 && .TFX WATCHES/WARNINGS/ADVISORIES... SEVERE THUNDERSTORM WATCH UNTIL 9 PM MDT THIS EVENING FOR MTZ008- 012-014-015-048>050-052>055. && SHORT TERM...CAMP LONG TERM...THOMSON AVIATION...MEIER WEATHER.GOV/GREATFALLS
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GREAT FALLS MT 307 PM MDT WED JUN 20 2007 MTZ009>011-013-044>047-049-051-212115- NORTHERN ROCKY MOUNTAIN FRONT-EASTERN GLACIER-HILL-CHOUTEAU-TOOLE- LIBERTY-EASTERN PONDERA-BLAINE-EASTERN TETON-FERGUS- 307 PM MDT WED JUN 20 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL MONTANA AND NORTH CENTRAL MONTANA. .DAY ONE...THIS AFTERNOON AND TONIGHT THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. MTZ008-012-014-015-048-050-052>055-212115- BEAVERHEAD-CASCADE-CENTRAL AND SOUTHERN LEWIS AND CLARK-MADISON- SOUTHERN ROCKY MOUNTAIN FRONT-JUDITH BASIN-JEFFERSON-BROADWATER- MEAGHER-GALLATIN- 307 PM MDT WED JUN 20 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL MONTANA...NORTH CENTRAL MONTANA AND SOUTHWEST MONTANA. .DAY ONE...THIS AFTERNOON AND TONIGHT THE NATIONAL WEATHER SERVICE HAS ISSUED SEVERE THUNDERSTORM WATCH 429 IN EFFECT UNTIL 9 PM MDT THIS EVENING. SCATTERED THUNDERSTORMS ARE EXPECTED. HAIL TO THE SIZE OF NICKELS AND WIND GUSTS TO 60 MPH ARE LIKELY WITH THESE STORMS. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREAT FALLS MT
401 PM MDT WED JUN 20 2007
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0350 PM HAIL BYNUM 47.98N 112.31W
06/20/2007 M0.50 INCH TETON MT TRAINED SPOTTER
PEA SIZE TO MARBLE SIZE HAIL FALLING.
&&
BRUSDAThe Billings radar (KBLX), 193 km away, was scanning. The volume nearest the first event began at 23:28 UTC.
1 thunderstorm wind. Local standard time, as filed.
Trees and powerlines down in parts of Bozeman. Damage to a shed.
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, June 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: 43141.