Severe thunderstorms developed over Gallatin and Fergus counties during the afternoon hours of the 10th. The thunderstorms were generally dry and produced wind gusts in excess of 60 mph.
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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.
Severe thunderstorms developed over Gallatin and Fergus counties during the afternoon hours of the 10th. The thunderstorms were generally dry and produced wind gusts in excess of 60 mph.
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 Aug 10, 1:46 PM MST, 10 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GREAT FALLS MT 246 PM MDT FRI AUG 10 2007 .DISCUSSION... TONIGHT THROUGH SUNDAY...UPPER TROF CONTINUES TO LIFT OUT OVER SOUTHERN CANADA. AN ASSOCIATED SURFACE COLD FRONT WILL PUSH ACROSS THE AREA LATER THIS AFTERNOON. THUNDERSTORMS HAVE DEVELOPED AHEAD OF THIS FEATURE AS THE AIRMASS HAS BECOME SUFFICIENTLY UNSTBALE. A RED FLAG WARNING REMAINS IN EFFECT THROUGH THIS EVENING AS WINDS BEHIND THE FRONT SHOULD BE GUSTY AT TIMES. SURFACE HIGH PRESSURE SLIDES OVER THE AREA SATURDAY BRINGING COOLER AIR AND GENERALLY DRY CONDITIONS. HEIGHTS BEGIN RISING AGAIN ON SUNDAY WITH TEMPERATURES MAKING A RETURN TO THE UPPER 80S AND LOWER 90S. EMANUEL SUNDAY NIGHT THROUGH WEDNESDAY NIGHT...A RATHER HOT AND MOSTLY DRY PERIOD OF WEATHER EXPECTED DURING THIS TIME. AN UPPER LEVEL RIDGE OF HIGH PRESSURE WILL BE OVER THE REGION THROUGH THE PERIOD...ALLOWING FOR MUCH ABOVE NORMAL TEMPERATURES TO RESIDE OVER THE AREA. ANY PRECIPITATION WILL BE VERY LIMITED AND ISOLATED...WITH THE BEST CHANCE FOR ANY THUNDERSTORMS OVER SOUTHWEST MONTANA MONDAY AND TUESDAY. ON WEDNESDAY AFTERNOON...A SLIGHTLY STRONGER UPPER LEVEL DISTURBANCE WILL MOVE INTO SOUTHWEST MONTANA PRODUCING A FEW THUNDERSTORMS...BUT THE OVERALL COVERAGE OF THESE STORMS ON WEDNESDAY STILL LOOK TO BE ISOLATED AT THIS TIME. BRUSDA THURSDAY AND FRIDAY...LATEST MODELS AGREE WITH A STRONG RIDGE DOMINATING MUCH OF THE LONG TERM. A TROUGH IN THE PACIFIC NORTHWEST IS EXPECTED TO MOVE THROUGH THE SOUTHERN PROVINCES OF CANADA WHICH MAY SET OFF SHOWERS AND THUNDERSTORMS MAINLY FOR THE WEST AND SOUTHWEST MOUNTAINS. TEMPERATURES WILL BE ABOVE NORMAL. SAUCIER && .AVIATION... UPDATED 1748Z. A WEAK STORM SYSTEM WILL AFFECT ROUTES AND TERMINALS DURING THE NEXT 24 HOURS. VFR FLIGHT CONDITIONS ARE EXPECTED TO PREVAIL DURING THIS TIME...WITH SMOKE OCCASIONALLY OBSCURING MOUNTAINS NEAR KHLN. HIGH BASED SHOWER ACTIVITY WILL BE PRESENT THROUGHOUT THE DAYLIGHT HOURS. A SURFACE COLD FRONT WILL MOVE THRU THE AREA TODAY...WITH WINDS SHIFTING TO NORTHWEST AND INTENSIFYING...PARTICULARLY NEAR KCTB...KGTF...KHVR...AND KLWT. WIND GUSTS TO 35KT MAY BE FOUND NEAR KCTB. THUNDERSTORM ACTIVITY IS ANTICIPATED TO EXIST FROM 21Z THRU 04Z...INITIATING OVER HIGH TERRAIN. ISOLATED MVFR CEILINGS MAY BE FOUND IN THE VICINITY OF THUNDERSTORMS. SKIES WILL BECOME MOSTLY CLEAR AND WINDS WILL DISSIPATE AFTER 08Z AS THE STORM SYSTEM MOVES EAST OF THE AREA. SEE APPROPRIATE TAFS FOR ADDITIONAL DETAILS. ZUMPFE && .FIRE WEATHER... AN UPPER LEVEL DISTURBANCE AND AN ASSOCIATED SURFACE FRONT WILL MOVE ACROSS NORTH CENTRAL MONTANA THIS AFTERNOON. ISOLATED THUNDERSTORMS WITH GUSTY WINDS WILL OCCUR AHEAD OF THE FRONT...THEN A WIND SHIFT FOLLOWED BY DRY CONDITIONS AND GUSTY WEST TO NORTHWEST WINDS BEHIND THE FRONT. A RED FLAG WARNING IS IN EFFECT FOR ALL FIRE WEATHER ZONES THROUGH THIS EVENING. && .PRELIMINARY POINT TEMPS/POPS... GTF 47 82 54 89 / 10 0 0 0 CTB 45 78 50 86 / 10 0 0 0 HLN 50 85 54 92 / 20 10 0 0 BZN 48 86 53 94 / 20 10 10 0 WEY 36 75 38 80 / 10 20 10 10 DLN 48 84 52 87 / 10 0 0 0 HVR 48 81 55 91 / 20 0 0 0 LWT 48 78 50 88 / 20 0 10 0 && .TFX WATCHES/WARNINGS/ADVISORIES... RED FLAG WARNING UNTIL MIDNIGHT MDT TONIGHT FOR MTZ112>118. && SHORT TERM...EMANUEL LONG TERM...BRUSDA/SAUCIER AVIATION...ZUMPFE WEATHER.GOV/GREATFALLS
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GREAT FALLS MT 457 AM MDT FRI AUG 10 2007 MTZ008>015-044>055-111100- BEAVERHEAD-NORTHERN ROCKY MOUNTAIN FRONT-EASTERN GLACIER-HILL- CASCADE-CHOUTEAU-CENTRAL AND SOUTHERN LEWIS AND CLARK-MADISON- TOOLE-LIBERTY-EASTERN PONDERA-BLAINE- SOUTHERN ROCKY MOUNTAIN FRONT-EASTERN TETON-JUDITH BASIN-FERGUS- JEFFERSON-BROADWATER-MEAGHER-GALLATIN- 457 AM MDT FRI AUG 10 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL MONTANA...NORTH CENTRAL MONTANA AND SOUTHWEST MONTANA. .DAY ONE...TODAY AND TONIGHT A RED FLAG WARNING IS IN EFFECT THIS AFTERNOON AND EVENING FOR ALL OF NORTH CENTRAL AND SOUTHWEST MONTANA. WEST TO NORTHWEST WINDS OF 15 TO 25 MPH...WITH GUSTS UP TO 40 MPH ARE EXPECTED OVER MUCH OF THE REGION. ISOLATED GUSTS NEAR 50 MPH ARE POSSIBLE OVER MOUNTAIN RIDGES. RELATIVE HUMIDITY VALUES WILL FALL TO BETWEEN 10 PERCENT AND 20 PERCENT...CREATING CRITICAL FIRE WEATHER CONDITIONS. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY A LOW PRESSURE SYSTEM WILL MOVE THROUGH NORTH CENTRAL MONTANA ON SUNDAY WITH GUSTY WEST WINDS DEVELOPING ALONG THE ROCKY MOUNTAIN FRONT AND OVER THE ADJACENT PLAINS. AFTERNOON HIGH TEMPERATURES ARE EXPECTED TO CLIMB INTO THE 90S WITH RELATIVE HUMIDITY VALUES DROPPING INTO THE TEENS. THE COMBINATION OF GUSTY WINDS ALONG WITH DRY AND HOT WEATHER COULD REQUIRE ISSUANCE OF FIRE WEATHER HIGHLIGHTS. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
The Great Falls radar (KTFX), 188 km away, was scanning. The volume nearest the first event began at 20:56 UTC.
4 thunderstorm wind. Local standard time, as filed.
A severe thunderstorm produced a wind gust to 61 mph at Gallatin Field Airport (Belgrade 1E).
A severe thunderstorm produced a wind gust to 59 mph at Big Sky 6S (Yellow Mule RAWS site).
A severe thunderstorm produced a wind gust to 68 mph at Bozeman 11E (Bozeman Hill DOT site).
A severe thunderstorm produced a wind gust to 58 mph at Roy 18N (Armells Creek RAWS site).
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, August 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: 47338, 47339, 47340, 47342.