Severe thunderstorms developed over a portion of North Central Montana during the late afternoon of the 23rd. Hail the size of quarters and wind gusts in excess of 60 mph were reported.
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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 a portion of North Central Montana during the late afternoon of the 23rd. Hail the size of quarters and wind gusts in excess of 60 mph were reported.
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 Jul 23, 1:55 PM MST, 1 hour 15 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GREAT FALLS MT 255 PM MDT MON JUL 23 2007 UPDATED FIRE WEATHER SECTION ONLY .DISCUSSION... TONIGHT...AN UPPER LEVEL RIDGE OF HIGH PRESSURE WILL CONTINUE TO AFFECT THE FORECAST AREA. A WEAK UPPER LEVEL TROUGH EMBEDDED WITHIN THE FLOW ALOFT WILL MOVE OVER THE FORECAST AREA TONIGHT...WITH THUNDERSTORM ACTIVITY BEGINNING THIS EVENING OVER THE SOUTHWEST MOUNTAINS...LATER SPREADING TO THE NORTH CENTRAL PLAINS. THUNDERSTORMS OVER THE SOUTHWEST MOUNTAINS ARE ANTICIPATED TO BE MOSTLY DRY...WITH SOME LIGHTNING AND LITTLE PRECIPITATION. TUESDAY THROUGH WEDNESDAY...A STRONG PACIFIC STORM SYSTEM WILL IMPINGE UPON THE UPPER LEVEL RIDGE TUESDAY...WITH A STRONG BAROCLINIC ZONE EXTENDING FROM SOUTHWEST TO NORTH CENTRAL MONTANA. PRECIPITABLE WATER WILL BE ON THE INCREASE DURING THIS TIME AS WELL...WITH THUNDERSTORMS CAPABLE OF PRODUCE SOME RAIN RATHER THAN ONLY DRY LIGHTNING. THE AVAILABLE MODEL GUIDANCE APPEARS TO DISAGREE SIGNIFICANTLY WITH RESPECT TO THE CONCENTRATION OF THE SYNOPTIC FORCING AND PRECIPITATION AMOUNTS. FORECAST PRECIPITATION AMOUNTS HAVE BEEN KEPT FAIRLY CONSERVATIVE DURING THIS TIME DUE TO MODEL DISAGREEMENT. THIS STORM SYSTEM IS LIKELY TO DECREASE TEMPERATURES BY NEARLY 20 DEGREES IN SOME LOCATIONS AFTER THE PASSAGE OF A SURFACE COLD FRONT BETWEEN TUESDAY AFTERNOON AND EARLY WEDNESDAY. ZUMPFE WEDNESDAY NIGHT THROUGH FRIDAY NIGHT...UPPER RIDGE THAT WAS FLATTENED BY WEDNESDAYS SHORTWAVE WILL INTENSIFY ON THURSDAY AND CONTINUE QUITE STRONG INTO THE FIRST PART OF THE WEEKEND. HAVE RAISED A FEW HIGH TEMPERATURES OVER SW MT ON THURSDAY. UPPER HIGH CENTERED OVER THE DESERT SOUTHWEST WILL DRAW MID-LEVEL MONSOONAL MOISTURE INTO THE STATE FOR ISOLATED AFTERNOON AND EVENING MAINLY MOUNTAIN THUNDERSTORMS. BLANK/BRITTON SATURDAY THROUGH MONDAY...MODELS CONTINUE WITH THE UPPER LEVEL RIDGE OVER THE WESTERN U.S. THUS...WILL GO WITH PERSISTENCE WITH CONTINUED HOT AND MOSTLY DRY WEATHER...EXCEPT FOR ISOLATED AFTERNOON THROUGH EARLY NIGHTTIME THUNDERSTORMS...MAINLY CONFINED TO THE SOUTHWEST AND THE MOUNTAINS WILLIAMSON DC && .AVIATION... UPDATED 1830Z. IN GENERAL EXPECT VFR CONDITIONS. THUNDERSTORMS WILL BE MOVING NORTHEAST THROUGH THE FORECAST AREA LATER THIS AFTERNOON AND EVENING. THERE COULD BE LOCAL MVFR/IFR CONDITIONS IN THE THUNDERSTORMS MAINLY EAST OF KHLN-KGTF-KHVR LINE. EXPECT THE THUNDERSTORMS TO END BY MIDNIGHT. COULD SEE A BAND OF SHOWERS OR THUNDERSTORMS DEVELOP ALONG THE EAST SLOPES OF THE ROCKY MOUNTAINS TUESDAY MORNING. CONFIDENCE IN WIND DIRECTION FORECASTS IS LOW BUT AT LEAST SPEEDS SHOULD GENERALLY BE LESS THAN 10 KNOTS. DO FEEL PRETTY CONFIDENT OF WEST TO NORTHWEST WINDS OF 10 TO 15 KNOTS OVER THE NORTH TUESDAY MORNING. BLANK && .FIRE WEATHER... UPDATED 2055Z. HAVE CANCELLED FIRE WEATHER WATCH FOR THIS EVENING AS CONDITIONS WILL BE MARGINAL FOR RED FLAG WITH A MIX OF WET AND DRY THUNDERSTORMS EXPECTED. WILL SEE AN INCREASE IN THUNDERSTORM ACTIVITY AND A WIND SHIFT TUESDAY AS A COLD FRONT MOVES THROUGH THE AREA. AT THIS POINT DO NOT ANTICIPATE A NEED FOR FIRE WEATHER HIGHLIGHTS AS MOST THUNDERSTORMS SHOULD BE WET BUT WILL CONTINUE TO CLOSELY MONITOR THE SITUATION. THOMSON && .PRELIMINARY POINT TEMPS/POPS... GTF 67 93 59 90 / 30 30 30 20 CTB 67 91 54 86 / 20 20 10 10 HLN 67 93 63 92 / 20 30 40 20 BZN 57 92 58 89 / 20 30 50 40 WEY 48 83 44 79 / 20 50 50 50 DLN 59 87 55 86 / 20 40 50 30 HVR 67 95 62 89 / 30 20 30 20 LWT 63 90 59 84 / 30 30 40 30 && SHORT TERM...ZUMPFE LONG TERM...BLANK/BRITTON/WILLIAMSON DC AVIATION...BLANK WEATHER.GOV/GREATFALLS
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GREAT FALLS MT 300 PM MDT MON JUL 23 2007 MTZ008>015-044>055-241045- 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- 300 PM MDT MON JUL 23 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL MONTANA...NORTH CENTRAL MONTANA AND SOUTHWEST MONTANA. .DAY ONE...TODAY AND TONIGHT NEAR RECORD HIGH TEMPERATURES ARE POSSIBLE TODAY. ISOLATED THUNDERSTORMS ARE POSSIBLE THIS AFTERNOON AND EVENING. THESE STORMS WILL HAVE GUSTY WINDS ASSOCIATED WITH THEM...WHICH MAY CAUSE SOME FIRE WEATHER CONCERNS IN THE EVENING. HOWEVER WIDESPREAD RED FLAG CONDITIONS ARE NOT EXPECTED. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY INCREASING WINDS AND MOISTURE COMBINED WITH VERY WARM TEMPERATURES TUESDAY WILL CONTINUE FIRE WEATHER CONCERNS. THUNDERSTORMS WILL RETURN TO MOST OF THE AREA TUESDAY AFTERNOON AND EVENING. SOME STORMS WILL BE CAPABLE OF PRODUCING GUSTY WINDS AND LOCALLY HEAVY RAINFALL. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
The Great Falls radar (KTFX), 96 km away, was scanning. The volume nearest the first event began at 22:10 UTC.
5 thunderstorm wind, 1 hail. Local standard time, as filed.
A severe thunderstorm produced a wind gust to 60 mph at Stanford 3NE. The storm also dropped pea sized hail as well as 1.5 inches of rain. Extensive crop damage was reported.
A severe thunderstorm dropped 1 inch diameter hail at Highwodd 7NE.
A severe thunderstorm produced a wind gust to 70 mph at Inverness 15S.
A severe thunderstorm produced a wind gust to 60 mph at Fort Benton 25NW.
A severe thunderstorm produced a wind gust to 89 mph at Havre 23N. The wind destoyed several farm sheds and snapped numerous trees.
A severe thunderstorm produced a wind gust to 72 mph at Harlem 16S.
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: 45722, 45711, 45714, 45718, 45724, 45727.