Flooding due to snowmelt occurred over portions of Pondera and Teton counties.
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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.
Flooding due to snowmelt occurred over portions of Pondera and Teton counties.
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 Mar 10, 5:10 AM MST, 4 hours 36 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GREAT FALLS MT 510 AM MST THU MAR 10 2011 AVIATION SECTION UPDATED .DISCUSSION... TODAY THROUGH SATURDAY...A STRONG PRESSURE GRADIENT OVER THE CONTINENTAL DIVIDE WILL CONTINUE TO BRING STRONG WINDS TO THE ROCKY MOUNTAIN FRONT TODAY. AS A RESULT...A HIGH WIND WARNING REMAINS IN EFFECT. MOST OF THE MOISTURE ON THE WEST SIDE OF THE DIVIDE WILL STAY CONFINED TO THE MOUNTAINS WITH THE REST OF MONTANA HAVING ONLY A SLIGHT CHANCE OF NEW SNOWFALL. MOISTURE BEGINS TO INCREASE ACROSS THE DIVIDE AND SOUTHWEST MONTANA THIS EVENING. LIGHT SNOWFALL IS EXPECTED ACROSS MUCH OF SOUTHWEST MONTANA THROUGH EARLY FRIDAY. WITH VALLEY TEMPERATURES LOOKING TO BE SOMEWHAT WARM...PRECIP MAY ALTERNATE BETWEEN SNOW AND RAIN OR COME AS A MIX OF THE TWO. PRECIPITATION WILL TAPER OFF AND CONDITIONS WILL BEGIN TO CLEAR OUT SATURDAY. TEMPERATURES ACROSS NORTH CENTRAL AND CENTRAL MONTANA SHOULD REMAIN WARMER THAN THEY HAVE BEEN WITH HIGHS TODAY REACHING THE LOW 50S IN MANY LOCATIONS. HIGHS FOR THE REST OF THE WEEK WILL BE IN THE 40S. SATURDAY NIGHT THROUGH THURSDAY...A RATHER SEASONABLE PERIOD OF WEATHER IS EXPECTED OVER THE REGION LATER THIS WEEKEND AND FOR MUCH OF NEXT WEEK. GENERALLY SEASONABLE TEMPERATURES ARE EXPECTED ACROSS THE REGION FOR SUNDAY THROUGH THE FIRST HALF OF NEXT WEEK. IN TERMS OF PRECIPITATION...THERE WILL BE A FEW UPPER LEVEL DISTURBANCES THAT WILL MOVE THROUGH THE REGION SUNDAY THROUGH TUESDAY. HOWEVER...MOST OF THE PRECIPITATION WILL BE CONFINED TO THE WESTERN AND SOUTHWESTERN MOUNTAINS...WITH A FEW ISOLATED SHOWERS POSSIBLE IN THE SOUTHWEST VALLEYS. ON WEDNESDAY...A BIT STRONGER DISTURBANCE IS EXPECTED TO MOVE INTO THE REGION...THUS THERE WILL BE A CHANCE FOR PRECIPITATION ACROSS THE ENTIRE REGION. AGAIN...AT THIS TIME NONE OF THESE STORM SYSTEMS LOOK TO BE VERY STRONG...BUT SOME ACCUMULATING MOUNTAIN SNOWFALL IS EXPECTED INTO EARLY NEXT WEEK...WITH LITTLE TO NO SNOW ACCUMULATIONS EXPECTED LOWER ELEVATIONS. BRUSDA && .AVIATION... UPDATED 1210Z. A HIGH WIND WARNING REMAINS IN EFFECT FOR THE ROCKY MOUNTAIN FRONT WITH STRONG WIND GUSTS UP TO 65KTS EXPECTED THROUGH FAVORED MOUNTAIN PASSES AND CANYONS. EXPECT SCATTERED SHOWERS OVER THE DIVIDE AS WELL...KEEPING MOUNTAINS OBSCURED AT TIMES. A WEAK WEATHER DISTURBANCE MOVING THROUGH THE REGION WILL KEEP SKIES MOSTLY CLOUDY. DOWN-SLOPE WINDS WILL KEEP MOST OF NORTH-CENTRAL AND CENTRAL MONTANA DRY...HOWEVER SCATTERED SHOWERS ARE POSSIBLE OVER SOUTHWEST MONTANA AFTER 20Z TODAY...ALONG WITH SOME MOUNTAIN OBSCURATIONS OVER THE SOUTHWEST AS WELL. && .HYDROLOGY... TEMPERATURES WILL WARM INTO THE UPPER 40S TO AROUND 50 AT LOWER ELEVATIONS ON WEDNESDAY AND THURSDAY. AREA RIVERS AND STREAMS WILL LIKELY RISE AS SNOW-MELT RUNS OFF. IN ADDITION...THE WARMER TEMPERATURES MAY ALSO INCREASE THE POTENTIAL FOR ICE JAMS AS RIVER ICE BREAKS UP. TEMPERATURES WILL COOL BACK TO NEAR SEASONAL AVERAGES LATER THIS WEEK INTO THE WEEKEND. && .PRELIMINARY POINT TEMPS/POPS... GTF 53 31 44 21 / 10 30 10 10 CTB 44 29 38 17 / 10 20 20 10 HLN 56 33 44 24 / 20 70 20 10 BZN 53 30 43 23 / 10 90 40 10 WEY 41 16 31 14 / 50 100 50 10 DLN 50 30 38 21 / 10 80 20 10 HVR 42 31 34 13 / 20 20 20 0 LWT 51 33 41 21 / 0 50 20 10 && .TFX WATCHES/WARNINGS/ADVISORIES... HIGH WIND WARNING UNTIL 5 AM MST FRIDAY NORTHERN ROCKY MOUNTAIN FRONT...SOUTHERN ROCKY MOUNTAIN FRONT. && SHORT TERM...GUSTAFSON LONG TERM...BRUSDA AVIATION...BRUSDA WEATHER.GOV/GREATFALLS
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GREAT FALLS MT 407 AM MST THU MAR 10 2011 MTZ009-048-111200- NORTHERN ROCKY MOUNTAIN FRONT-SOUTHERN ROCKY MOUNTAIN FRONT- 407 AM MST THU MAR 10 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTH CENTRAL MONTANA. .DAY ONE...TODAY AND TONIGHT A HIGH WIND WARNING IS IN EFFECT FOR THE ROCKY MOUNTAIN FRONT. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY THE HIGH WIND WARNING FOR THE ROCKY MOUNTAIN FRONT IS IN EFFECT UNTIL 5 AM MST FRIDAY. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. MTZ008-010>015-044>047-049>055-111200- BEAVERHEAD-EASTERN GLACIER-HILL-CASCADE-CHOUTEAU- CENTRAL AND SOUTHERN LEWIS AND CLARK-MADISON-TOOLE-LIBERTY- EASTERN PONDERA-BLAINE-EASTERN TETON-JUDITH BASIN-FERGUS- JEFFERSON-BROADWATER-MEAGHER-GALLATIN- 407 AM MST THU MAR 10 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL MONTANA...NORTH CENTRAL MONTANA AND SOUTHWEST MONTANA. .DAY ONE...TODAY 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... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
The national radar mosaic for the moment the first event began.
2 flood. Local standard time, as filed.
Numerous road closures across Pondera county.
Numerous road closures across Teton county.
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, March 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: 370026, 370027.