Rapid snowmelt caused flooding on area streams and creeks across Madison county. Original start date was 06/30/11 and flooding continued through the first week of July.
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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.
Rapid snowmelt caused flooding on area streams and creeks across Madison county. Original start date was 06/30/11 and flooding continued through the first week of July.
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 30, 9:45 PM MST, 2 hours 15 minutes earlier.
AREA FORECAST DISCUSSION...CORRECTED NATIONAL WEATHER SERVICE GREAT FALLS MT 1045 PM MDT THU JUN 30 2011 UPDATED AVIATION .UPDATE... MINOR CHANGES TO POPS THIS EVENING WITH ISOLATED SHOWERS CONTINUING OVER FAR SOUTHWEST MONTANA BUT THESE WILL CONTINUE TO DISSIPATE. FEW HIGH CLOUDS WILL MOVE OVER THE NORTHERN ROCKY MOUNTAIN FRONT...OTHERWISE MAINLY CLEAR TO PARTLY CLOUDY SKIES ARE EXPECTED. BREEZY CONDITIONS WILL PERSIST OVERNIGHT WHICH WILL KEEP TEMPERATURES AROUND SEASONAL AVERAGES. REMAINDER OF THE FORECAST IS ON TRACK SO MADE NO FURTHER CHANGES. MLS && .AVIATION... UPDATED 0436Z. QUIET CONDITIONS ARE EXPECTED THROUGH THE TAF PERIOD AS AN UPPER LEVEL RIDGE OF HIGH PRESSURE SLOWLY BUILDS INTO THE REGION FRIDAY. VFR CONDITIONS SHOULD PREVAIL THOUGH FRIDAY NIGHT WITH PATCHES OF FAIR WEATHER CUMULUS AND HIGH LEVEL CLOUDS. WINDS WILL BE LIGHT OVERNIGHT BUT WILL BEGIN GUSTING TO NEAR 20 KNOTS ACROSS NORTH CENTRAL MONTANA AFTER 15Z. WINDS WILL SUBSIDE AFTER 00Z. LANGLIEB && .HYDROLOGY... COOLER TEMPERATURES THE NEXT 48 HOURS WILL SLOW SNOW MELT RATES SLIGHTLY BUT WARMER TEMPS THIS WEEKEND WILL INCREASE RATES AGAIN. RESERVOIRS ACROSS THE AREA REMAIN NEAR CAPACITY AND AS A RESULT COULD INCREASE THE AMOUNT OF WATER RELEASED AND SUBSEQUENT WATER LEVELS. && .PREV DISCUSSION... /ISSUED 545 PM MDT THU JUN 30 2011/ TONIGHT THROUGH SATURDAY...BROAD UPPER TROF CONTINUES TO LIFT OUT WITH A FAST WESTERLY FLOW SETTING UP OVER THE COUNTY WARNING AREA. THIS SETS THE STAGE FOR A DRY AND WARM PERIOD OVER THE NEXT FEW DAYS. A FEW CONVECTIVE SHOWERS ARE POSSIBLE THIS AFTERNOON AND EVENING OVER THE WESTERN MOUNTAINS AND OVER THE MOUNTAINS OF SOUTHWEST MONTANA. CONVECTIVE SHOWERS SHOULD END WITH SUNDOWN. WESTERLY FLOW ALOFT CONTINUES FRIDAY AND 500MB HEIGHTS RISE ON SATURDAY. EMANUEL SATURDAY NIGHT THROUGH THURSDAY...THE LATEST GFS AND ECMWF MODELS ARE IN BETTER AGREEMENT THAN THEY WERE LAST NIGHT. THE PERIOD WILL START OFF WITH DRY SOUTHWEST FLOW ALOFT. ON SUNDAY A COLD FRONT ASSOCIATED WITH A WEATHER DISTURBANCE ALOFT OVER THE PACIFIC NORTHWEST IS EXPECTED TO MOVE TO NEAR A LINE FROM CONRAD TO BUTTE NEAR 6 PM. IT WILL THEN MOVE EAST THROUGH THE REMAINDER OF THE FORECAST AREA SUNDAY EVENING. AHEAD OF THE COLD FRONT IT WILL BE HOT SUNDAY AFTERNOON WITH A FEW RECORD HIGH TEMPERATURES POSSIBLE. LITTLE MOISTURE IS FORECAST WITH THE COLD FRONT BUT EXPECT SOME INSTABILITY SUNDAY AFTERNOON. THE COLD FRONT MIGHT PROVIDE ENOUGH LIFT TO TOUCH OFF ISOLATED THUNDERSTORMS LATE IN THE AFTERNOON AND INTO THE EVENING. SOUTHWEST FLOW CONTINUES ON THE FOURTH AND BEHIND THE COLD FRONT IT WILL BE COOLER..BUT TEMPERATURES WILL STILL BE ABOVE AVERAGE. COULD SEE ISOLATED THUNDERSTORMS OVER SOUTHWEST MONTANA DURING THE AFTERNOON AND EVENING PERIOD AND POSSIBLY INTO CENTRAL MONTANA DURING THE EVENING PERIOD. THE GFS AND ECMWF MODELS ARE NOW ON THE SAME PAGE IN DEVELOPING AN UPPER RIDGE OVER WESTERN AND CENTRAL MONTANA ON WEDNESDAY. THE GFS CONTINUES THE UPPER RIDGE ON THURSDAY WHILE THE ECMWF MOVES IT INTO EASTERN MONTANA. THIS RIDGING WILL CONTINUE TO KEEP TEMPERATURES ABOVE AVERAGE DURING THE TUESDAY THROUGH THURSDAY PERIOD. ALTHOUGH THE AIRMASS IS EXPECTED TO CONTINUE RELATIVELY DRY..WARM AFTERNOON TEMPERATURES AND WEAK INSTABILITY COULD TRIGGER ISOLATED THUNDERSTORMS. BLANK && .PRELIMINARY POINT TEMPS/POPS... GTF 47 73 48 83 / 0 0 0 0 CTB 46 70 45 79 / 0 0 0 0 HLN 48 74 48 83 / 10 0 0 0 BZN 46 76 47 85 / 30 0 10 0 WEY 35 70 35 78 / 30 10 10 0 DLN 43 74 45 83 / 10 0 0 0 HVR 49 73 49 83 / 0 0 0 0 LWT 46 70 46 80 / 20 10 10 0 && .TFX WATCHES/WARNINGS/ADVISORIES... FLOOD HIGHLIGHTS REMAIN IN EFFECT UNTIL FURTHER NOTICE. && SHORT TERM...EMANUEL/MLS LONG TERM...BLANK AVIATION...LANGLIEB WEATHER.GOV/GREATFALLS
HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE GREAT FALLS MT 224 PM MDT THU JUN 30 2011 MTZ012-015-055-011200- CASCADE-MADISON-GALLATIN- 224 PM MDT THU JUN 30 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL MONTANA AND SOUTHWEST MONTANA. .DAY ONE...THIS AFTERNOON AND TONIGHT FLOOD HIGHLIGHTS REMAIN IN EFFECT ACROSS PORTIONS OF THE REGION. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY FLOOD HIGHLIGHTS WILL REMAIN IN EFFECT ACROSS PORTIONS OF THE REGION UNTIL FURTHER NOTICE. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. MTZ008>011-013-014-044>054-011200- BEAVERHEAD-NORTHERN ROCKY MOUNTAIN FRONT-EASTERN GLACIER-HILL- CHOUTEAU-CENTRAL AND SOUTHERN LEWIS AND CLARK-TOOLE-LIBERTY- EASTERN PONDERA-BLAINE-SOUTHERN ROCKY MOUNTAIN FRONT- EASTERN TETON-JUDITH BASIN-FERGUS-JEFFERSON-BROADWATER-MEAGHER- 224 PM MDT THU JUN 30 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL MONTANA...NORTH CENTRAL MONTANA AND SOUTHWEST MONTANA. .DAY ONE...THIS AFTERNOON AND TONIGHT THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.
The national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
Water rapidly increased on the Wisconsin and Indian Creeks affecting areas around Sheridan and Twin Bridges.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Montana in 2011Every state in 2011This day in weather historyWarnings in Montana, July 2011
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: 370597.