1 hail, as filed by the National Weather Service.
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 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 4, 7:53 AM MST, 5 hours 37 minutes earlier.
SOUTHWEST AND NORTH CENTRAL MONTANA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GREAT FALLS MT 853 AM MDT SAT AUG 4 2001 WILL UPDATE ZONES THIS MORNING TO INCREASE MAX TEMPERATURES F0R THIS AFTERNOON AND REFLECT THE MOSTLY CLEAR CONDITIONS THIS MORNING. FIRST SHORT WAVE WENT CWA THROUGH LAST NIGHT...THE 2ND NOW MOVING THROUGH EASTERN WASHINGTON. WATER VAPOR IMAGERY SHOWS DRY SLOT THROUGH WRN 3RD MONTANA...RESULTING IN MOSTLY CLEAR SKIES...ALLOWING GOOD INSOLATION AHEAD OF NEXT TROUGH. SFC ANALYSIS SUGGESTS COLD FRONT NEAR CTB THEN EXTENDING SW ACROSS THE DIVIDE. DON NOT EXPECT THIS FRONT TO ACTIVELY ADVANCE UNTIL MUCH LATER TODAY. NEW ETA PREDICTS THAT THE STRONGEST DYNAMICS WILL AFFECT THE CWA LATE THIS AFTERNOON AND EVENING. GREATEST THREAT WILL BE THE WINDS WITH HIGH BASED TSTMS. WE HAVE ISSUED RED FLAG WARNING FOR LOW RH, DRY TSTMS AND ASSOCIATED WINDS. MIELKE GTF EU 095/057 087/055 092 14330 CTB EU 085/052 084/050 088 14330 HLN EU 095/052 089/050 091 14330 BZN EU 094/052 090/050 092 14330 WEY EU 087/044 084/042 088 14330 DLN EU 088/048 086/046 088 14320 HVR EU 099/060 090/058 094 14230 LWT EU 097/055 088/053 090 14230
The Great Falls radar (KTFX), 149 km away, was scanning. The volume nearest the first event began at 20:27 UTC.
1 hail. Local standard time, as filed.
Reported by general public at campground at Basin 14 SW...Golf ball sized hail accumulated to 4 inches deep.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Montana in 2001Every state in 2001This day in weather historyWarnings in Montana, August 2001
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: 5266042.