Weak up-slope flow and a relatively moist and unstable atmosphere combined with an upper-level disturbance to generate a few severe thunderstorms.
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.
Weak up-slope flow and a relatively moist and unstable atmosphere combined with an upper-level disturbance to generate a few severe thunderstorms.
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 Aug 15, 6:27 PM MST, 22 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GLASGOW MT 727 PM MDT FRI AUG 15 2014 .SHORT TERM...FOR NORTHEAST MONTANA...TONIGHT THROUGH SUNDAY... EVENING UPDATE... LINE OF THUNDERSTORMS TO THE WEST OF THE CWA ON RADAR ARE EXPECTED TO MOVE THROUGH THE WESTERN HALF OF THE CWA BEFORE MIDNIGHT. AREA IS STABILIZED OUT FROM AFTERNOON CONVECTION. SO, THE OVERALL TREND FOR ENTERING THUNDERSTORMS SHOULD BE DOWNWARD THROUGH MIDNIGHT. POPS WERE UPDATE TO ACCOUNT FOR THIS. PATCHY FOG IS ALSO BEING HINTED AT BY THE RAP AND HRRR. NAMDNG5 DOES NOT INCLUDE THE POSSIBILITY OF FOG AND WITH SKY COVER HAVING A HARD TIME CLEARING CONFIDENCE IS LOW AND FOG WILL BE LIMITED IN COVERAGE. GAH PREVIOUS SHORT TERM DISCUSSION... MAIN CHALLENGES THIS PERIOD WAS IF AND HOW MUCH RAIN...AND IF IT WILL FOG TONIGHT. TWO SYSTEMS AFFECTING THE CWA. ONE IS A MCS-TYPE DISSIPATING OVER THE SE ZONES. GFS DOING A HORRIBLE JOB OF THIS ONE TODAY AS IT/S QPF/S WERE TOO LOW. NAM A BIT BETTER. WITH STEADY RAIN CONTINUING...SMALL STREAM FLOOD ADVISORY FOR THIS AREA WAS EXTENDED TILL 630 PM. ATTENTION THEN TURNS TO THE SECOND SYSTEM...UPPER CLOSED LOW THAT IS DRIFTING NE INTO THE NORTHERN/CANADIAN ROCKIES. THUNDERSTORMS...SOME SEVERE...OVER WESTERN MONTANA HAVE FORMED AS A RESULT AND ARE EXPECTED TO SPREAD INTO CENTRAL MONTANA THIS AFTERNOON. THESE STORMS SHOULD REACH THE WESTERN ZONES AND COULD BE STRONG. SINCE GFS DIDN/T PERFORM WELL TODAY...SIDED MORE WITH A NAM/ECMWF BLEND WITH THINGS THROUGH MOST OF THE PERIOD. 12Z ECMWF SHOWS DECENT QPF FOR THE SE ZONES THAT WILL HAVE TO BE WATCHED AS SOIL CONDITIONS ARE NOW VERY WET. OTHERWISE...SHOWERS/THUNDERSTORMS WILL CONTINUE TO BE SCATTERED ACROSS THE CWA THROUGH THE PERIOD...PROVIDING BENEFICIAL RAINS TO MOST AREAS. TFJ .LONG TERM...SUNDAY NIGHT THROUGH FRIDAY... FOUND BEST CONSENSUS FOR UPDATING THE LONG TERM FORECAST THROUGH WEDNESDAY MORNING. MAIN CONCERN FOR THIS FORECAST PERIOD IS THE INFLUENCE OF THE LARGE-SCALE UPPER-LEVEL OPEN TROUGH WHICH DESCENDS SOUTHWARD FROM THE CANADIAN ROCKIES AND SPREADS ACROSS OUR BORDER WITH THEM THROUGH MOST OF NEXT WEEK. THE SMALLER-SCALE DETAILS OF SHORT WAVE ENERGY AND TIMING AND PLACEMENT STILL NEED TO BE WORKED OUT...BUT SOME POTENTIAL EXISTS FOR MORE WIDESPREAD AND HEAVY RAINFALL...ESPECIALLY TOWARD THE LATTER PART OF NEXT WEEK. LATE MONDAY THROUGH EARLY WEDNESDAY SEEMS TO BE A RELATIVELY DRY PERIOD OF TIME BETWEEN STORM SYSTEMS. THIS WOULD COINCIDE WITH THE GOOD MODEL CONSENSUS REPRESENTING A SHORT WAVE RIDGE DURING THIS TIME FRAME. BMICKELSON PREVIOUS LONG TERM DISCUSSION...UPPER TROUGH/LOW WILL EXIT THE AREA SUNDAY NIGHT. AS THE TROUGH MOVES TO THE EAST...A SLIGHT CHANCE OF SHOWERS AND THUNDERSTORMS WILL LINGER IN SOME AREAS IN SOME AREAS AS WEAK WAVES ARE POSSIBLE IN THE NW FLOW ALOFT BEHIND THE TROUGH. MONDAY NIGHT INTO TUESDAY MORNING WILL BE MAINLY DRY WITH THE AREA BETWEEN SYSTEMS. AN UPPER TROUGH DIGS INTO WESTERN CANADA AND THE PACIFIC NORTHWEST ON TUESDAY AND WEDNESDAY. THIS WILL BRING FREQUENT SHORTWAVES WITH INCREASING CHANCES OF SHOWERS AND THUNDERSTORMS. THE TROUGH EXPANDS INTO MONTANA ON THURSDAY AND FRIDAY WITH DEEP MOISTURE EXPECTED. LOOK FOR A GOOD CHANCE OF SHOWERS AND THUNDERSTORMS. FORRESTER && .AVIATION... FLIGHT CATEGORY: MAINLY VFR EXPECTED... AS LOW AS ISOLATED IFR POSSIBLE. SYNOPSIS: A LARGE-SCALE STORM SYSTEM WILL SLOWLY MOVE THROUGH THE REGION OVER THE NEXT FEW DAYS. PERIODS OF RAIN SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE. HEAVY RAIN AND IFR CONDITIONS WILL ACCOMPANY SOME OF THE STRONGER STORMS. EXPECT MAINLY MID-LEVEL SCT CLOUDS IN BETWEEN THE SHOWERS. FOG: DUE TO EXCESSIVE RAINFALL... LIMITED PATCHY FOG WILL BE POSSIBLE THROUGH THE MORNING HOURS WITH ANY CLEARING THAT OCCURS OVERNIGHT. LOCAL RAP AND HRRR MODELS ARE HINTING AT IFR VISIBILITIES HOWEVER NAM IS NOT SO CONFIDENCE IS TOO LOW TO INCLUDE DIRECTLY IN TAFS YET. AREA WINDS: VARIABLE WINDS AS OUTFLOWS FROM NEARBY STORMS WILL IMPACT WIND SPEED AND DIRECTION. GAH/BMICKELSON && .GLASGOW WATCHES/WARNINGS/ADVISORIES...NONE. && WEATHER.GOV/GLASGOW
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE GLASGOW MT 313 AM MDT FRI AUG 15 2014 MTZ016>027-059>062-160900- 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- 313 AM MDT FRI AUG 15 2014 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHEAST MONTANA. .DAY ONE...TODAY AND TONIGHT AN UPPER LEVEL LOW PRESSURE SYSTEM WILL BRING PLENTY OF MOISTURE INTO THE REGION...ALLOWING FOR SHOWERS AND THUNDERSTORMS TO CONTINUE. HEAVY RAINFALL WILL BE POSSIBLE WITH SOME STRONGER STORMS. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY FREQUENT SHOWERS AND THUNDERSTORMS WILL CONTINUE CHANCES FOR HEAVY RAINFALL THROUGH THE WEEKEND. AROUND AN INCH OF TOTAL RAINFALL WITH LOCALLY HIGHER AMOUNTS BY SUNDAY ARE POSSIBLE FOR THE REGION. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GLASGOW MT
527 PM MDT FRI AUG 15 2014
MTZ018-061-160030-
DANIELS-VALLEY-
527 PM MDT FRI AUG 15 2014
THE NATIONAL WEATHER SERVICE IN GLASGOW HAS ISSUED A
SIGNIFICANT WEATHER ADVISORY FOR...
NORTHEASTERN VALLEY COUNTY IN NORTHEAST MONTANA...
SOUTHWESTERN DANIELS COUNTY IN NORTHEAST MONTANA...
UNTIL 630 PM MDT.
AT 525 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 7 MILES SOUTH OF RICHLAND...MOVING SOUTH AT 15
MPH.
HAIL UP TO ONE-HALF INCH IN DIAMETER IS EXPECTED WITH THIS STORM...
ALONG WITH HEAVY RAIN AND FREQUENT DANGEROUS LIGHTNING.
LOCATIONS IN THE ADVISORY INCLUDE...
WEST FORK...
LARSLAN...
LAT...LON 4881 10601 4857 10577 4856 10602 4857 10602
4857 10625 4882 10619
TIME...MOT...LOC 2327Z 000DEG 12KT 4871 10610
MICKELSON
WEATHER.GOV/GLASGOWPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GLASGOW MT
531 PM MDT FRI AUG 15 2014
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0500 PM HEAVY RAIN SE WIBAUX 46.98N 104.18W
08/15/2014 M4.50 INCH WIBAUX MT TRAINED SPOTTER
STORM TOTAL RAINFALL
&&
JBPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GLASGOW MT
619 PM MDT FRI AUG 15 2014
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0600 PM HEAVY RAIN 9 NW CARLYLE 46.73N 104.23W
08/15/2014 M3.65 INCH WIBAUX MT TRAINED SPOTTER
STORM TOTAL RAINFALL
&&
JBSPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GLASGOW MT
631 PM MDT FRI AUG 15 2014
MTZ060-160130-
PHILLIPS-
631 PM MDT FRI AUG 15 2014
THE NATIONAL WEATHER SERVICE IN GLASGOW HAS ISSUED A
SIGNIFICANT WEATHER ADVISORY FOR...
SOUTHWESTERN PHILLIPS COUNTY IN NORTHEAST MONTANA...
UNTIL 730 PM MDT.
AT 627 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 25 MILES NORTH OF ROY...MOVING NORTHEAST AT 30
MPH.
HAIL UP TO THE SIZE OF NICKELS AND WIND GUSTS UP TO 50 MPH ARE
EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN AND FREQUENT
DANGEROUS LIGHTNING.
LOCATIONS IN THE ADVISORY INCLUDE...
ZORTMAN...
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 4791 10889 4793 10887 4793 10864 4800 10861
4798 10845 4806 10843 4766 10820 4759 10820
4757 10836 4761 10845 4759 10850 4761 10852
4761 10867 4764 10872 4764 10877 4771 10882
4774 10890
TIME...MOT...LOC 0030Z 231DEG 26KT 4771 10901
TEMPLER
WEATHER.GOV/GLASGOWPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GLASGOW MT
710 PM MDT FRI AUG 15 2014
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0700 PM HEAVY RAIN 4 NNW GLENDIVE 47.16N 104.74W
08/15/2014 M3.58 INCH DAWSON MT TRAINED SPOTTER
STORM TOTAL RAINFALL
&&
JBSPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GLASGOW MT
717 PM MDT FRI AUG 15 2014
MTZ021-160215-
PETROLEUM-
717 PM MDT FRI AUG 15 2014
THE NATIONAL WEATHER SERVICE IN GLASGOW HAS ISSUED A
SIGNIFICANT WEATHER ADVISORY FOR...
PETROLEUM COUNTY IN NORTHEAST MONTANA...
UNTIL 815 PM MDT.
AT 715 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 17 MILES EAST OF ROY...MOVING EAST AT 20 MPH.
HAIL UP TO THE SIZE OF NICKELS AND WIND GUSTS UP TO 50 MPH ARE
EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN AND FREQUENT
DANGEROUS LIGHTNING.
LOCATIONS IN THE ADVISORY INCLUDE...
RURAL AREAS OF WESTERN PETROLEUM COUNTY...
RURAL AREAS OF CENTRAL PETROLEUM COUNTY...
RURAL AREAS OF NORTHERN PETROLEUM 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 4727 10873 4728 10860 4731 10859 4733 10833
4758 10831 4760 10807 4757 10793 4750 10790
4740 10791 4735 10796 4732 10793 4725 10795
4726 10797 4717 10792 4712 10795 4698 10788
4694 10791 4700 10862 4709 10862 4710 10874
TIME...MOT...LOC 0117Z 263DEG 19KT 4739 10858
TEMPLER
WEATHER.GOV/GLASGOWThe Glasgow radar (KGGW), 156 km away, was scanning. The volume nearest the first event began at 01:50 UTC.
2 thunderstorm wind. Local standard time, as filed.
Trained spotter estimated 60 mph winds and reported heavy rain with frequent lightning.
The ASOS at the Jordan Airport measured a 58 mph wind gust.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Montana in 2014Every state in 2014This day in weather historyWarnings in Montana, August 2014
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: 538275, 538276.