Snow melt and rain fall caused street flooding.
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 episode as NWS MSO wrote it up.
Snow melt and rain fall caused street flooding.
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 Missoula, MT wrote its last area forecast discussion before the first event at Jun 23, 2:33 AM MST, 2 hours 27 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE MISSOULA MT 333 AM MDT THU JUN 23 2011 .DISCUSSION...A MID LEVEL DISTURBANCE MOVED THROUGH THE NORTHERN ROCKIES LAST NIGHT CAUSE WIDESPREAD SHOWERS AND THUNDERSTORMS. BEHIND THIS FEATURE THE ATMOSPHERE WILL REMAIN FAIRLY UNSTABLE ALLOWING FOR THE DEVELOPMENT OF MORE SHOWERS AND POTENTIALLY THUNDERSTORMS THIS MORNING. THE MODELS ARE STILL INDICATING A COLD FRONT SWINGING THROUGH THE NORTHERN ROCKIES LATER TODAY. THIS FRONT WILL HELP WITH THE DEVELOPMENT OF THUNDERSTORMS. THE STRONGEST STORMS ARE STILL ANTICIPATED FOR LEMHI COUNTY UP INTO SOUTHWEST MONTANA. BEHIND THE FRONT GUSTY WESTERLY WINDS WILL MIX TO THE SURFACE. THESE WINDS COULD CAUSE CHOPPY CONDITIONS ON FLATHEAD LAKE. AT THIS TIME SUSTAINED WINDS ARE NOT ANTICIPATED TO EXCEED 20 MPH SO A LAKE WIND ADVISORY WILL NOT LIKELY BE NEEDED. THE SHOWER AND THUNDERSTORM ACTIVITY IS ANTICIPATED TO DIMINISH THIS EVENING AS THE FRONT MOVES OFF INTO CENTRAL MONTANA AND WE START LOSING SOLAR HEATING. THE NORTHERN ROCKIES WILL REMAIN UNDER A WESTERLY FLOW AS A LOW PRESSURE SYSTEM MIGRATES EASTERLY IN SOUTHERN CANADA. THIS FLOW PATTERN WILL KEEP TEMPERATURES FAIRLY COOL ON FRIDAY...AROUND 10 DEGREES BELOW NORMAL. SATURDAY THROUGH WEDNESDAY...A TROUGH OF LOW PRESSURE MOVING ALONG THE CANADIAN BORDER WILL BRING THE POTENTIAL OF SOME RAINFALL OVER THE WEEKEND. THE LACK OF MOISTURE WITH THIS SYSTEM WILL LIMIT THE POTENTIAL FOR RAINFALL. A TROUGH OF LOW PRESSURE DIGGING ALONG THE WEST COAST WILL HELP TEMPORARILY AMPLIFY A SHORT-LIVED RIDGE OVER THE NORTHER ROCKIES. THIS RIDGE WILL BREAK DOWN AS THE TROUGH MOVES INLAND WEDNESDAY OR THURSDAY. && .AVIATION...THE ATMOSPHERE WILL REMAIN FAIRLY UNSTABLE THIS MORNING AFTER THE PASSAGE OF A MID LEVEL DISTURBANCE. SO A FEW SHOWERS AND THUNDERSTORMS COULD REDEVELOP. THIS AFTERNOON A COLD FRONT WILL SWING THROUGH THE NORTHERN ROCKIES. THIS FRONT WILL ENHANCE THUNDERSTORM DEVELOPMENT ESPECIALLY OVER KBTM AND KSMN. A FEW OF THESE THUNDERSTORMS COULD BE STRONG. SHOWER AND THUNDERSTORM ACTIVITY IS ANTICIPATED TO DIMINISH THIS EVENING AS THE FRONT MOVES INTO CENTRAL MONTANA. && NOTE: FLOOD WATCHES...WARNINGS AND ADVISORIES WILL NOT BE LISTED BELOW. .MSO WATCHES/WARNINGS/ADVISORIES... MT...NONE. ID...NONE. && SHORT TERM...SMITH LONG TERM....LOEFFELBEIN AVIATION...SMITH
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MISSOULA MT 151 AM MDT THU JUN 23 2011 MTZ001>003-230830- FLATHEAD/MISSION VALLEYS-KOOTENAI/CABINET REGION-WEST GLACIER/BOB MARSHALL REGION- 151 AM MDT THU JUN 23 2011 ...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL FLATHEAD COUNTY UNTIL 230 AM MDT... AT 148 AM MDT...STORM SPOTTERS REPORTED A STRONG THUNDERSTORM 7 MILES SOUTHWEST OF KALISPELL...MOVING NORTHEAST AT 20 MPH. HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN AND FREQUENT DANGEROUS LIGHTNING. LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...KALISPELL... EVERGREEN...WHITEFISH...COLUMBIA FALLS...LA SALLE AND HUNGRY HORSE. PRECAUTIONARY/PREPAREDNESS ACTIONS... IF THREATENING WEATHER APPROACHES YOUR AREA...GO INDOORS AND STAY AWAY FROM WINDOWS. IF YOU ARE CAUGHT OUTSIDE...MOVE TO A WELL PROTECTED AREA. && LAT...LON 4851 11437 4840 11403 4803 11436 4811 11460 TIME...MOT...LOC 0751Z 206DEG 17KT 4816 11442
The national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
Warm Springs Creek flooded the Cedar Street bridge in Anaconda. Homes and Cedar Street bridge were sand bagged. Washoe Park was flooded. Water flooded the foundation of 4 homes.
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, June 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: 322691.