Strong thunderstorms fired up in the afternoon and remained sub-severe in the area.
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.
Strong thunderstorms fired up in the afternoon and remained sub-severe in the area.
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 18, 1:39 PM MST, 1 hour 15 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GLASGOW MT 239 PM MDT MON JUN 18 2012 .SHORT TERM...FOR NORTHEAST MONTANA...TONIGHT THROUGH WEDNESDAY... WATER VAPOR IMAGERY SHOWS THE SHORTWAVE MOVING OVER THE NORTHERN ROCKIES AND INTO WESTERN MONTANA. ZONAL FLOW EARLY THIS AFTERNOON HAS TRANSITIONED INTO SW FLOW ALOFT OVER EASTERN MONTANA. THIS SHORTWAVE WILL CREATE WIDESPREAD CONVECTION ACROSS EASTERN MONTANA LATER THIS AFTERNOON AND EVENING. AS A MATTER OF FACT WE ARE ALREADY SEEING CONVECTION ON THE RADAR ACROSS THE REGION. SHORTWAVE WILL BECOME MORE OF A CLOSED LOW OVER EASTERN MONTANA AS IT MOVES ACROSS ON TUESDAY. SHOWERS WITH THUNDERSTORMS WILL CONTINUE THROUGH TUESDAY EVENING BEFORE TAPERING OFF. THE STRONGEST LARGE SCALE FORCING FOR ASCENT WILL SPREAD THROUGH OUR CWA FROM TONIGHT THROUGH TUESDAY EVENING. A MORE WIDESPREAD WETTING RAIN EVENT OVER THE NEXT 36 HOURS IS EXPECTED...ALTHOUGH QPF TOTAL RAINFALL AMOUNTS ARE EXPECTED TO REMAIN BETWEEN HALF AND ONE INCH. EXPECT A NEAR STEADY WESTERLY WIND THROUGHOUT THE PERIOD. THE MAIN TROUGH AXIS AND FORCING CLEAR OUR EASTERN CWA BY EARLY WEDNESDAY AND SCATTERED SHOWERS FOLLOW IT AWAY FROM NORTHEAST MONTANA THROUGH THE REMAINDER OF THE SHORT TERM FORECAST PERIOD AS UPPER LEVEL RIDGING STRENGTHENS BEHIND IT. RSMITH .LONG TERM...WEDNESDAY NIGHT THROUGH MONDAY... MODELS IN VERY GOOD AGREEMENT WITH AN AMPLIFIED PATTERN. THE WEATHER TAKES ON MORE OF A MID-SUMMER LOOK WITH HIGHS IN THE 80S. A SHARP UPPER RIDGE BUILDS N OVER E MT AND THE PLAINS STATES EARLY IN THE PERIOD...AND THEN HOLDS IN PLACE FOR SEVERAL DAYS. A CLOSED UPPER LOW SITS ALONG THE PACIFIC NW COAST THE ENTIRE PERIOD. MODERATELY STRONG SW FLOW BETWEEN THESE REACHES INTO E MT. THIS ALONG WITH THE SHARPNESS OF RIDGE...ALONG WITH THE HIGH CENTER BEING QUITE FAR AWAY OVER THE S PLAINS...WILL MEAN MULTIPLE WEAK SHORTWAVES WILL BE ABLE TO REACH OUR AREA. ISOLATED STRONG LATE AFTERNOON AND EVENING THUNDERSTORMS EXPECTED MOST DAYS. SOME MODELS HAVE BEEN TRYING TO KNOCK DOWN THE RIDGE MONDAY...PREFER THE MAJORITY SLOWER SOLUTION. MODELS VARYING QUITE A BIT TOO ON HOW MUCH OF THE VERY WARM AIR GETS PUMPED N INTO MT FROM THIS RIDGE...A MONTH OR SO LATER IN THE SEASON WOULD PROBABLY MEAN 90S INSTEAD OF 80S FOR HIGHS. SIMONSEN. PREVIOUS LONG TERM...WEDNESDAY NIGHT THROUGH MONDAY...EXTENDED PERIOD DOMINATED BY BUILDING RIDGE OVER THE NORTHERN PLAINS WITH TROF DIGGING ALONG THE WEST COAST. EXPECT DRY WEATHER ON THURSDAY WITH THE UPPER RIDGE AXIS PUSHES THROUGH THE NORTHERN ROCKIES. BY FRIDAY AFTERNOON...RIDGE AXIS IS EXPECTED TO BE NEAR THE NORTH DAKOTA BORDER...LEADING TO GOOD SOUTHWEST FLOW ALOFT INTO MONTANA. MODELS BRING SEVERAL SHORTWAVES THROUGH THE SOUTHWEST FLOW...ALONG WITH MAINTAINING LEE TROF OVER CENTRAL MONTANA. PERSISTENCE OF LEE TROF WILL RESULT IN GOOD LOW LEVEL JET PULLING MOISTURE NORTH ACROSS THE PLAINS. THERMAL RIDGE ALSO IN PLACE ACROSS EASTERN MONTANA...FOR WARM AND RELATIVELY HUMID CONDITIONS THROUGH THE WEEKEND. THIS WILL SET THE STAGE FOR DECENT THUNDERSTORM POTENTIAL...INCLUDING POSSIBLY SEVERE WEATHER... ALTHOUGH PREDICTABILITY FOR TIMING AND POSITION OF STORMS IS STILL LOW. EBERT && .AVIATION... SCATTERED THUNDERSTORMS WITH BROKEN CEILINGS 5K FT AGL THRU THIS EVENING. THE STRONGER THUNDERSTORMS MAY LOWER VISIBILITY BRIEFLY TO 3 TO 5 MILES. LATE TONIGHT AND TUESDAY...THE SHOWERS AND ISOLATED THUNDERSTORMS WILL BECOME NUMEROUS...WITH OVERCAST CEILINGS LOWERING TO MVFR AS WELL AS VISIBILITIES OF 3 TO 5 MILES AT TIMES. SIMONSEN && .GLASGOW WATCHES/WARNINGS/ADVISORIES...NONE. && WEATHER.GOV/GLASGOW
HAZARDOUS WEATHER OUTLOOK...UPDATED NATIONAL WEATHER SERVICE GLASGOW MT 748 PM MDT SUN JUN 17 2012 MTZ016>027-059>062-190200- 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- 748 PM MDT SUN JUN 17 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHEAST MONTANA. .DAY ONE...TONIGHT NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED.
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GLASGOW MT
326 PM MDT MON JUN 18 2012
MTZ019-182215-
SHERIDAN-
326 PM MDT MON JUN 18 2012
THE NATIONAL WEATHER SERVICE IN GLASGOW HAS ISSUED A
SIGNIFICANT WEATHER ADVISORY FOR...
CENTRAL SHERIDAN COUNTY IN NORTHEAST MONTANA...
UNTIL 415 PM MDT.
AT 317 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 7 MILES SOUTH OF REDSTONE...MOVING EAST 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.
LOCATIONS IN THE ADVISORY INCLUDE...
PLENTYWOOD...
LAT...LON 4887 10445 4862 10443 4863 10497 4865 10497
4865 10499 4881 10501
TIME...MOT...LOC 2125Z 268DEG 17KT 4873 10484
GILCHRIST
WEATHER.GOV/GLASGOWSPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE GLASGOW MT 354 PM MDT MON JUN 18 2012 MTZ018>020-062-182230- DANIELS-SHERIDAN-ROOSEVELT- 354 PM MDT MON JUN 18 2012 THE NATIONAL WEATHER SERVICE IN GLASGOW HAS ISSUED A SIGNIFICANT WEATHER ADVISORY FOR... NORTHERN ROOSEVELT COUNTY IN NORTHEAST MONTANA... SOUTHWESTERN SHERIDAN COUNTY IN NORTHEAST MONTANA... SOUTHEASTERN DANIELS COUNTY IN NORTHEAST MONTANA... UNTIL 430 PM MDT. AT 347 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM 10 MILES EAST OF BREDETTE...MOVING SOUTHEAST AT 25 MPH. HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN. LOCATIONS IN THE ADVISORY INCLUDE... RURAL AREAS OF NORTHERN AND CENTRAL ROOSEVELT COUNTY... RURAL AREAS OF SOUTHERN AND WESTERN SHERIDAN COUNTY... RURAL AREAS OF SOUTHEASTERN DANIELS COUNTY... LAT...LON 4847 10450 4823 10501 4849 10528 4867 10499 TIME...MOT...LOC 2153Z 312DEG 21KT 4850 10504 GILCHRIST WEATHER.GOV/GLASGOW
The Glasgow radar (KGGW), 120 km away, was scanning. The volume nearest the first event began at 21:54 UTC.
3 hail. Local standard time, as filed.
A trained spotter reported penny sized hail covering the ground about 1 inch deep and some water running in the fields due to heavy rain about 10 miles east-northeast of Bredette in Roosevelt County.
Law enforcement reported penny sized hail covering the ground 9 miles northwest of Froid in Roosevelt County.
A trained spotter reported nickel sized hail covering the ground, and also heavy rain with the storm about 2 miles northeast of Froid in Roosevelt County.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Montana in 2012Every state in 2012This day in weather historyWarnings in Montana, June 2012
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: 393786, 393787, 393788.