Beaver and Frenchmen creeks were the main flooding tributaries with this episode.
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 GGW wrote it up.
Beaver and Frenchmen creeks were the main flooding tributaries with this episode.
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 Glasgow, MT wrote its last area forecast discussion before the first event at Apr 21, 8:26 AM MST, 3 hours 55 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GLASGOW MT 926 AM MDT THU APR 21 2011 .SHORT TERM...FOR NORTHEAST MONTANA...TODAY THROUGH SATURDAY... UPDATES WERE MADE TO LOWER POPS AND SKY FOR THE AREA TODAY. WINDS WERE LOWERED A BIT TOO. REST OF FORECAST LOOKED GOOD. JAMBA PREVIOUS DISCUSSION... UPPER RIDGE WILL MOVE TO THE EAST TODAY AND SHORTWAVE TROUGH WILL MOVE ACROSS THE PACIFIC NORTHWEST. A SURFACE LOW CURRENTLY OVER WYOMING WILL STRENGTHEN TODAY. AN INVERTED SURFACE TROUGH EXTENDING NORTH FROM THE LOW INTO CENTRAL MONTANA WILL MOVE TO THE EAST TONIGHT. WHILE TODAY WILL BE DRY FOR THE MOST PART...SOUTHWEST FLOW ALOFT AHEAD OF THE UPPER TROUGH WILL BRING INCREASING MOISTURE TO EASTERN MONTANA. EXPECT A FEW RAIN SHOWERS TO DEVELOP THIS AFTERNOON AND BECOME MORE NUMEROUS TONIGHT. MOST OF THE MOISTURE WILL BE SOUTH OF THE MISSOURI RIVER CLOSER TO THE SURFACE LOW. WILL FORECAST LIKELY TO CATEGORICAL POPS THERE. NORTHERLY WINDS WILL BE BRINGING LOW LEVEL DRY AIR FROM THE NORTH TONIGHT AND FRIDAY WHICH WILL LIMIT THE CHANCES OF PRECIP NORTH OF THE MISSOURI RIVER. THE INVERTED SURFACE TROUGH WILL ACT AS A COLD FRONT AS OT PASSES THROUGH EASTERN MONTANA TONIGHT. TEMPERATURES WILL BECOME BORDERLINE FOR RAIN AND SNOW AFTER MIDNIGHT TONIGHT. EXPECT PRECIP TYPE TO BECOME ELEVATION DEPENDENT. WITH MODELS DIFFERING ON TEMPERATURE PROFILES ALOFT AT THIS POINT...WILL MAINTAIN A RAIN/SNOW MIX. WILL GENERALLY FORECAST HIGHER SNOW AMOUNTS AT HIGHER ELEVATIONS. NOT SURE IF ANY LOCATIONS WILL ACCUMULATE ENOUGH SNOW TO WARRANT A WINTER WEATHER ADVISORY. WILL HOLD OFF ON ISSUING ANY HIGHLIGHTS FOR NOW. WHILE THE SURFACE LOW MOVES TO THE EAST ON FRIDAY...THE UPPER TROUGH LINGERS OVER THE AREA. DEEP MOISTURE LINGERS SOUTH OF THE MISSOURI RIVER FOR MOST OF THE DAY. TEMPERATURE PROFILES REMAIN RIGHT AT THE BORDERLINE BETWEEN RAIN AND SNOW. WILL MAINTAIN A MIXED PRECIP FORECAST FOR NOW WITH LIKELY OR HIGHER POPS TO THE SOUTH AND CHANCE POPS TO THE NORTH. THE UPPER TROUGH AND MOISTURE MOVES TO THE EAST FRIDAY NIGHT. THE MIXED PRECIP WILL END. NORTHWEST FLOW ALOFT WILL BE OVER THE AREA ON SATURDAY. A WEAK SHORTWAVE IN THE AFTERNOON WILL COMBINE WITH UNSTABLE AIR TO PROVIDE A SLIGHT CHANCE OF SHOWERS. FORRESTER .LONG TERM...SATURDAY NIGHT THROUGH THURSDAY... SATURDAY NIGHT THOUGH MONDAY NIGHT... A RIDGE ACROSS THE PACIFIC NORTHWEST WILL MOVE ONTO THE PLAINS RAISING TEMPERATURES. MEANWHILE... ANOTHER PACIFIC TROUGH WILL BEGIN THROWING OFF SHORTWAVE ENERGY WITH THE MAIN ONE COMING THROUGH MONDAY EVENING THROUGH TUESDAY. THIS MAY BE ABLE TO SPARK OFF SOME THUNDER DURING THE AFTERNOONS WITH INTERMITTENT RAIN SHOWERS MONDAY AND TUESDAY. THE FULL TROUGH SHOULD MOVES THROUGH BY TUESDAY WITH A SLIGHT COOL DOWN BEHIND IT. TUESDAY NIGHT THROUGH WEDNESDAY NIGHT... FLOW BECOMES SPLIT WITH MONTANA EXPERIENCING MORE OF THE NORTHERN RIDGE OF THE FLOW. TEMPERATURES SHOULD RISE TO NEAR NORMAL FOR THE SEASON WITH REDUCED CHANCES FOR RAIN. THURSDAY ONWARD... PACIFIC TROUGH MOVES ONSHORE... BRINGING A SOMEWHAT FAST MOVING SYSTEM THROUGH THE AREA. ASSOCIATED COLD FRONT SHOULD BRING A CHANCE FOR PRECIPITATION MID DAY THURSDAY INTO FRIDAY MORNING. DROPPED TEMPERATURES SLIGHTLY ON THURSDAY AND THURSDAY NIGHT COMPARED TO MOST GUIDANCE DUE TO THE COLD FRONT AND PRECIPITATION CHANCES IN THE REGION. JB/GAH && .AVIATION... VFR CONDITIONS WILL PREVAIL TODAY. THE MVFR CLOUDS AND SHOWERS LOOK MAINLY TO HOLD OFF NOW UNTIL TONIGHT. JAMBA && .HYDROLOGY... MODERATE TO MINOR FLOODING CONTINUES ON THE MILK RIVER. HOWEVER... LEVELS ARE SLOWLY FALLING AND SHOULD CONTINUE TO GENERALLY IMPROVE FOR THE NEXT COUPLE WEEKS. SIGNIFICANT SNOW IS STILL ON THE GROUND OVER SOUTHWEST SASKATCHEWAN...NORTHERN BLAINE... PHILLIPS... AND VALLEY COUNTIES... AND THIS SNOW MELT WILL IMPACT THE LOWER MILK RIVER OVER THE NEXT COUPLE WEEKS. THE RIVER AT THE BJORNBERG BRIDGE NEAR SACO HAS FALLEN TO ABOUT 19.91 FEET AND IS NOW BELOW FLOOD STAGE. THE RIVER AT THAT LOCATION WILL CONTINUE TO FALL. THE FLOOD WARNING FOR THAT SITE WILL BE CANCELLED BY 10Z. WATER LEVELS WILL CONTINUE TO SLOWLY FALL ALONG THE MILK RIVER AT TAMPICO...GLASGOW AND NASHUA. TAMPICO FELL BELOW THE MAJOR FLOOD STAGE OF 27 FEET ON WEDNESDAY. GLASGOW IS EXPECTED TO CONTINUE DROPPING THROUGH THE WEEK...POSSIBLY REACHING THE MINOR FLOODING STAGE THIS WEEKEND. NASHUA WILL REMAIN ABOVE MINOR FLOOD STAGE OF 20 FEET INTO NEXT WEEK. THE AREAL FLOOD WARNING FOR EASTERN PHILLIPS AND MOST OF VALLEY COUNTIES CONTINUES. WATER LEVELS ON THE UPPER REACHES OF CREEKS FLOWING INTO THE MILK VALLEY HAVE SUBSIDED... WITH FLOODING CONTINUING WHERE THESE CREEKS ENCOUNTER THE MILK RIVER. THIS INCLUDES BEAVER CREEK FROM THE SACO FLATS THROUGH HINSDALE AND ANTELOPE... BRAZIL... AND WILLOW CREEKS NEAR GLASGOW. THE WATER LEVELS ON THE FRENCHMAN RIVER AND ROCK CREEK AT THE CANADIAN BORDER HAVE BEEN DROPPING BUT THESE LEVELS ARE EXPECTED TO FLUCTUATE OVER THE NEXT FEW WEEKS AS SNOW MELT TO THE NORTH CONTINUES. && .GLASGOW WATCHES/WARNINGS/ADVISORIES...NONE. && WEATHER.GOV/GLASGOW
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GLASGOW MT 341 AM MDT THU APR 21 2011 MTZ016-017-059-061-220900- CENTRAL AND SOUTHEAST PHILLIPS-CENTRAL AND SOUTHERN VALLEY- NORTHERN PHILLIPS-NORTHERN VALLEY- 341 AM MDT THU APR 21 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHEAST MONTANA. .DAY ONE...TODAY AND TONIGHT A FLOOD WARNING REMAINS IN EFFECT FOR VALLEY AND NORTHEAST PHILLIPS COUNTIES. FLOODING WILL CONTINUE ON THE MILK RIVER AND NEARBY TRIBUTARIES FOR THE NEXT FEW WEEKS. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. MTZ021>027-060-220900- PETROLEUM-GARFIELD-MCCONE-RICHLAND-DAWSON-PRAIRIE-WIBAUX- SOUTHWEST PHILLIPS- 341 AM MDT THU APR 21 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHEAST MONTANA. .DAY ONE...TODAY AND TONIGHT A STORM SYSTEM WILL AFFECT THE AREA TONIGHT AND FRIDAY. THERE IS A POTENTIAL FOR ACCUMULATING SNOW DEPENDING ON TEMPERATURES. THE AREAS MOST LIKELY TO SEE ACCUMULATING SNOW FROM THIS STORM WILL BE HIGHER ELEVATION AREAS LIKE THE LITTLE ROCKY MOUNTAINS... BIG SHEEP MOUNTAINS... WIBAUX... PETROLEUM AND WESTERN GARFIELD COUNTIES. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .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.
On April 21st, the Beaver and Frenchmen Creeks continue to flood. On April 24th, the Beaver Creek levels have dropped and back within it's banks. The Frenchmen Creek is back within it's banks along the International Border.
Flooding on the tributaries continue. Roads that are closed include the North Tampico Road, 6th Avenue, Whately Rd, Lenz Rd, Canal Rd and Rahlf Rd. On April 24th, many of the creeks receded into their respective banks.
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, April 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: 307783, 307785.