Low lying areas flooded due to thunderstorms with heavy rain.
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.
Low lying areas flooded due to thunderstorms with heavy rain.
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 Jun 11, 6:46 PM MST, 49 minutes earlier.
AREA FORECAST DISCUSSION...UPDATED NATIONAL WEATHER SERVICE GLASGOW MT 746 PM MDT SAT JUN 11 2011 .SHORT TERM...FOR NORTHEAST MONTANA...TONIGHT THROUGH MONDAY... UPDATE...A LINE OF THUNDERSTORMS CONTINUES ACROSS THE REGION FROM THE SCOBEY AREA DOWN THROUGH NASHUA ALONG FORT PECK LAKE TO WINNETT MOVING EAST. DO NOT FEEL THAT THE ATMOSPHERE UNSTABLE ENOUGH TO PRODUCE ANY WIDESPREAD SEVERE AREAS. AN ISOLATED REPORT IS POSSIBLE EAST OF WOLF POINT TO CIRCLE LINE THROUGH 10 PM. THE BIGGEST ISSUE WILL BE FLASH FLOODING WITH ANY TRAINING STORMS OR SLOW MOVING STORMS. WILL UPDATE AGAIN WITH THE 10 PM WITH THE EXPIRATION OF THE FLASH FLOOD WATCH. PROTON PREVIOUS DISCUSSION...BUSY CONVECTIVE PATTERN FOR THE AREA TO CONTINUE INTO SUNDAY BUT IT LOOKS LIKE THE AREA SHOULD GET A WELCOME BREAK ON MONDAY. ACTIVITY DEVELOPING TODAY NEAR A SURFACE TROUGH UNDER SOUTHWEST UPPER FLOW WILL LIKELY HOLD TOGETHER INTO THE EVENING HOURS AND MOVE INTO THE NORTHEASTERN PORTION OF THE CWA. NO REPORTS OF SEVERE WEATHER HAVE BEEN REPORTED YET BUT WITH LOW VILS NEEDED FOR SEVERE HAIL...CANNOT RULE OUT A SEVERE STORM OR TWO INTO THE EVENING HOURS. THIS ROUND MOVES OUT THEN ANOTHER ROUND DEVELOPS WITH THIS SLOW MOVING SURFACE TROUGH. BRIEF HEAVY RAIN/HAIL AND DAMAGING WINDS LOOK AGAIN POSSIBLE ESPECIALLY OVER THE EASTERN ZONES AS WARMER TEMPS WILL BUILD THESE UP BETTER. ON MONDAY...THE UPPER TROUGH AND SURFACE FEATURE MOVE OFF TO OUR NORTHEAST ALLOWING FOR A SUNNY DAY IN MOST AREAS WITH WEST WINDS. JAMBA .LONG TERM...MONDAY NIGHT THROUGH SATURDAY... ALTHOUGH GENERAL AGREEMENT CONTINUES AMONG THE EXTENDED RANGE MODELS...TIMING ISSUES CLOUD THE PICTURE. THE INHERITED FORECAST MATCHES WHAT IS EXPECTED WITH UNCERTAINTY FACTORED IN. FEW CHANGES MADE TO THE EXTENDED PERIOD GRIDS. SCT PREVIOUS DISCUSSION... THE GFS...GEM AND EC REMAIN IN GENERAL AGREEMENT THROUGH THE EXTENDED PERIOD. SLIGHT TIMING/STRENGTH DIFFERENCE STILL REMAIN HOWEVER SO ONLY MINOR GRID CHANGES WERE MADE BASED ON THE LATEST GUIDANCE. A SHORTWAVE TROUGH OVER WESTERN MONTANA WILL MOVE OVER CENTRAL MONTANA AND BRING A CHANCE OF SHOWERS AND THUNDERSTORMS FOR MONDAY NIGHT. THUNDERSTORMS WILL DEVELOP OVER CENTRAL MONTANA MONDAY AFTERNOON AND MOVE INTO EASTERN MONTANA MONDAY EVENING AND MONDAY NIGHT. MODELS AGAIN DISAGREE ON OVERALL STRENGTH OF THE SHORTWAVE BUT DO AGREE ON A SHORTWAVE MOVING ACROSS EASTERN MONTANA DURING THIS PERIOD. TUESDAY NIGHT THE NEXT UPPER WAVE MOVES INTO THE PACIFIC NORTHWEST WHICH PUSHES UP A RIDGE OVER NEMONT THROUGH WEDNESDAY. WEDNESDAY NIGHT AND THURSDAY THE UPPER WAVE CLOSES OFF AND BEGINS TO STACK UP WITH THE SURFACE LOW AS IT TREKS THROUGH SOUTHERN SASKATCHEWAN. THIS WAVE BRINGS US A BETTER CHANCE FOR RAIN WITH HIGHER QPF AMOUNTS THROUGH THE REMAINDER OF THE FORECAST PERIOD. THIS WAVE WILL ALSO INTRODUCE A COOLING TREND THROUGH SATURDAY SO WILL STILL HAVE TO PAY ATTENTION TO SATURATED GROUNDS AS HYDROLOGY CONCERN CONTINUE. SCT/RSMITH && .AVIATION... EXPECT VFR CONDITIONS AT ALL TERMINAL THIS MORNING WITH A SHORTWAVE TROUGH APPROACHING CENTRAL MONTANA AND INCREASING THE INSTABILITY ACROSS EASTERN MONTANA THROUGH SATURDAY NIGHT. THIS WILL CREATE A CHANCE FOR SHOWERS AND THUNDERSTORMS AT ALL TERMINALS THROUGH SATURDAY NIGHT. SOME OF THESE STORMS MAY BECOME SEVERE WITH HAIL...STRONG WINDS AND HEAVY RAINFALL POSSIBLE. EXPECT TEMPORARY MVFR/IFR CONDITIONS AND THE WINDS WILL INCREASE OUT OF THE EAST SOUTHEAST AT 10 TO 20 KNOTS. RSMITH && .HYDROLOGY... EXTENSIVE FLOODING CONTINUES ON THE MILK RIVER FROM NEAR SACO THROUGH NASHUA. FLUCTUATIONS ARE EXPECTED IN RIVER LEVEL OVER THE NEXT WEEK AS RUNOFF FROM RECENT RAINS MOVES INTO AND DOWN THE RIVER. HIGH WATER ALSO WILL CONTINUE ON STREAMS FEEDING INTO THE MILK RIVER FROM THE SOUTH INCLUDING PEOPLES CREEK...BEAVER CREEK AND WILLOW CREEK. FLOODING ALSO CONTINUES ALONG THE MUSSELSHELL RIVER AND MANY CREEKS ACROSS PETROLEUM COUNTY. WATER RELEASES WILL CONTINUE FROM FORT PECK DAM AT AROUND 60K CFS. THE MISSOURI RIVER FROM BELOW THE DAM TO THE NORTH DAKOTA BORDER WILL CONTINUE TO RISE DUE TO THESE RELEASES COMBINED WITH THE HIGH WATER FLOWING FROM THE MILK RIVER. THE WEATHER PATTERN REMAINS SOMEWHAT ACTIVE WITH PERIODS OF RAIN THROUGH THE NEXT WEEK. HOWEVER...HEAVY RAIN SIMILAR TO WHAT WAS SEEN IN THE PAST FEW WEEKS IS NOT CURRENTLY FORECAST AND MONDAY LOOKS TO BE A BREAK FROM THE WET PATTERN. && .GLASGOW WATCHES/WARNINGS/ADVISORIES... FLASH FLOOD WATCH UNTIL 10 PM MDT THIS EVENING FOR CENTRAL AND SOUTHERN VALLEY...NORTHERN PHILLIPS...NORTHERN VALLEY. && WEATHER.GOV/GLASGOW
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GLASGOW MT 521 PM MDT SAT JUN 11 2011 MTZ016>027-059>062-121100- CENTRAL AND SOUTHEAST PHILLIPS-CENTRAL AND SOUTHERN VALLEY- DANIELS-SHERIDAN-WESTERN ROOSEVELT-PETROLEUM-GARFIELD-MCCONE- RICHLAND-DAWSON-PRAIRIE-WIBAUX-NORTHERN PHILLIPS- SOUTHWEST PHILLIPS-NORTHERN VALLEY-EASTERN ROOSEVELT- 521 PM MDT SAT JUN 11 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHEAST MONTANA. .DAY ONE...TONIGHT SMALL CREEKS...STREAMS AND RIVERS WILL CONTINUE TO RUN HIGH ACROSS THE REGION. FLOODING IS OCCURRING ALONG THE MILK... MISSOURI AND MUSSELSHELL RIVERS...AS WELL AS ON STREAMS AND CREEKS FLOWING INTO THESE RIVERS. ISOLATED TO SCATTERED THUNDERSTORMS WILL CONTINUE THIS EVENING. SOME OF THE STORMS MAY BE SEVERE WITH LARGE HAIL BEING THE MAIN THREAT. ANY THUNDERSTORM WILL BE CAPABLE OF PRODUCING HEAVY RAIN WHICH MAY RESULT IN SHORT TERM LOCALIZED FLOODING OR FLASH FLOODING. THEREFORE A FLASH FLOOD WATCH IS IN EFFECT FOR VALLEY AND NORTHERN PHILLIPS COUNTY UNTIL 10 PM. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY FLOODING WILL PERSIST ON NUMEROUS STREAMS FOR THE FORESEEABLE FUTURE DUE TO THE ALREADY SATURATED GROUNDS AND THE OVERALL WET WEATHER PATTERN WE ARE CURRENTLY OBSERVING. THERE IS A CHANCE FOR THUNDERSTORMS TO DEVELOP ON SUNDAY AND SUNDAY EVENING. SOME STORMS MAY PRODUCE HEAVY RAIN AND BECOME SEVERE WITH GUSTY WINDS AND LARGE HAIL. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GLASGOW MT
622 PM MDT SAT JUN 11 2011
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0545 PM HEAVY RAIN 19 N NASHUA 48.41N 106.36W
06/11/2011 M2.00 INCH VALLEY MT PUBLIC
RAIN FELL WITHIN 30 MINUTES. PEA SIZED HAIL WAS MIXED IN.
WATER IS EVERYWHERE.
0547 PM HEAVY RAIN 7 ESE LARSLAN 48.55N 106.05W
06/11/2011 M0.60 INCH VALLEY MT TRAINED SPOTTER
RAINFALL TOTAL FELL WITHIN 20 MINUTES. STILL LIGHTLY
RAINING AND THERE IS RAPID RUNOFF FROM THE FIELDS.
0600 PM HAIL 14 N NASHUA 48.33N 106.36W
06/11/2011 E0.50 INCH VALLEY MT PUBLIC
ALONG HIGHWAY 438 HAIL WAS ABOUT 1 INCH DEEP.
0600 PM HEAVY RAIN 14 N NASHUA 48.33N 106.36W
06/11/2011 E3.00 INCH VALLEY MT PUBLIC
TWO TO THREE INCHES OF RAIN FELL BETWEEN 12 MILES NORTH
AND 17 MILES NORTH OF NASHUA. WATER IS COVERING THE
FIELDS.
&&
ASCHNETZPRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE GLASGOW MT
632 PM MDT SAT JUN 11 2011
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0545 PM HEAVY RAIN 19 NNE NASHUA 48.39N 106.20W
06/11/2011 M2.00 INCH VALLEY MT PUBLIC
RAIN FELL WITHIN 30 MINUTES. PEA SIZED HAIL WAS MIXED IN.
WATER IS EVERYWHERE.
0600 PM HAIL 14 NNE NASHUA 48.32N 106.24W
06/11/2011 E0.50 INCH VALLEY MT PUBLIC
ALONG HIGHWAY 438 HAIL WAS ABOUT 1 INCH DEEP.
0600 PM HEAVY RAIN 14 NNE NASHUA 48.32N 106.24W
06/11/2011 E3.00 INCH VALLEY MT PUBLIC
TWO TO THREE INCHES OF RAIN FELL BETWEEN 12 MILES NORTH
AND 17 MILES NORTH OF NASHUA ALONG HIGHWAY 438. WATER IS
COVERING THE FIELDS.
&&
ASCHNETZSPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GLASGOW MT 648 PM MDT SAT JUN 11 2011 MTZ017-020-120145- ROOSEVELT-VALLEY- 648 PM MDT SAT JUN 11 2011 THE NATIONAL WEATHER SERVICE IN GLASGOW HAS ISSUED A SIGNIFICANT WEATHER ADVISORY FOR... EASTERN VALLEY COUNTY IN NORTHEAST MONTANA... WESTERN ROOSEVELT COUNTY IN NORTHEAST MONTANA... UNTIL 745 PM MDT. AT 643 PM MDT...STORM SPOTTERS REPORTED A STRONG THUNDERSTORM 5 MILES SOUTH OF LUSTRE...MOVING NORTHEAST AT 20 MPH. HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN. LOCATIONS IN THE ADVISORY INCLUDE... LUSTRE... THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE. LAT...LON 4852 10581 4831 10560 4824 10588 4832 10595 TIME...MOT...LOC 0048Z 216DEG 17KT 4833 10586 BLM WEATHER.GOV/GLASGOW
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GLASGOW MT
653 PM MDT SAT JUN 11 2011
MTZ022-120200-
GARFIELD-
653 PM MDT SAT JUN 11 2011
THE NATIONAL WEATHER SERVICE IN GLASGOW HAS ISSUED A
SIGNIFICANT WEATHER ADVISORY FOR...
SOUTHERN GARFIELD COUNTY IN NORTHEAST MONTANA...
UNTIL 800 PM MDT.
AT 652 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 19 MILES SOUTHWEST OF COHAGEN...MOVING NORTH AT
15 MPH.
HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 40 MPH ARE
EXPECTED WITH THIS STORM.
LOCATIONS IN THE ADVISORY INCLUDE...
RURAL AREAS OF SOUTHERN GARFIELD COUNTY...
RURAL AREAS OF CENTRAL GARFIELD COUNTY...
THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND
TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL
INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE.
LAT...LON 4710 10723 4710 10665 4687 10673 4685 10690
4686 10710
TIME...MOT...LOC 0053Z 172DEG 11KT 4694 10698
BLM
WEATHER.GOV/GLASGOWSPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GLASGOW MT 657 PM MDT SAT JUN 11 2011 MTZ017-020-120200- ROOSEVELT-VALLEY- 657 PM MDT SAT JUN 11 2011 THE NATIONAL WEATHER SERVICE IN GLASGOW HAS ISSUED A SIGNIFICANT WEATHER ADVISORY FOR... EASTERN VALLEY COUNTY IN NORTHEAST MONTANA... WESTERN ROOSEVELT COUNTY IN NORTHEAST MONTANA... UNTIL 800 PM MDT. AT 652 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM 10 MILES NORTH OF FRAZER...MOVING NORTH AT 15 MPH. HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN. LOCATIONS IN THE ADVISORY INCLUDE... RURAL AREAS OF EASTERN VALLEY COUNTY... RURAL AREAS OF WESTERN ROOSEVELT COUNTY... THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE. LAT...LON 4836 10602 4828 10570 4815 10587 4819 10608 TIME...MOT...LOC 0057Z 202DEG 11KT 4822 10596 BLM WEATHER.GOV/GLASGOW
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GLASGOW MT
720 PM MDT SAT JUN 11 2011
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0700 PM FLASH FLOOD 11 N NASHUA 48.29N 106.36W
06/11/2011 VALLEY MT PUBLIC
SARGENT CREEK...11 MILES NORTH OF NASHUA IS RUNNING OUT
OF ITS BANKS
&&
MATTMThe national radar mosaic for the moment the first event began.
2 flood. Local standard time, as filed.
Flooding mainly occurred on the Peoples and Beaver Creeks.
Flooding mainly occurred on the Antelope, Brazil and Willow Creeks.
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: 323662, 323663.