An unseasonably deep low pressure system moved from southeast Saskatchewan across Manitoba as a cold front swept through the Northern Plains. The tight pressure gradient with combined with strong atmospheric mixing resulted in very gusty winds.
Every event with a place to put it; 26 filed by county or forecast zone are drawn at its center, in a lighter ring. 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 BIS wrote it up.
An unseasonably deep low pressure system moved from southeast Saskatchewan across Manitoba as a cold front swept through the Northern Plains. The tight pressure gradient with combined with strong atmospheric mixing resulted in very gusty winds. The highest wind gust of 76 mph was reported in far northwest Divide County.
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 Bismarck, ND wrote its last area forecast discussion before the first event at Jul 28, 8:53 AM CST, 2 hours 7 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BISMARCK ND 953 AM CDT TUE JUL 28 2015 .UPDATE... ISSUED AT 945 AM CDT TUE JUL 28 2015 DEEP SURFACE LOW CENTERED ACROSS SOUTHEAST SASKATCHEWAN FORECAST TO TRACK EAST INTO MANITOBA BY MIDNIGHT TONIGHT. BAND OF H850 WINDS FROM 50 TO 65KT WILL MOVE THROUGH WESTERN AND CENTRAL NORTH DAKOTA. EXPECT WINDS TO INCREASE THROUGH THE DAY. PEAK WINDS WILL BE LATE AFTERNOON INTO THE EARLY EVENING. SMALL AMOUNT OF CAPE FORECAST AT KISN THIS AFTERNOON BUT NOT ENOUGH TO ADD THUNDERSTORMS TO AT THIS TIME. CURRENT FORECAST TRENDING WELL. UPDATE ISSUED AT 626 AM CDT TUE JUL 28 2015 WINDS CONTINUE TO BE ON THE INCREASE ACROSS THE AREA AS SOME LOCATIONS OVER NORTHWEST NORTH DAKOTA ARE ALREADY GUSTING OVER 30 MPH. THIS TREND WILL CONTINUE THIS MORNING AS THE LOW WORKS SLOWLY TOWARDS THE EAST. GOING FORECAST REFLECTS THIS WELL. && .SHORT TERM...(TODAY AND TONIGHT) ISSUED AT 321 AM CDT TUE JUL 28 2015 MAIN HIGHLIGHT TODAY AND INTO THIS EVENING IS A HIGH WIND WARNING FOR WESTERN AND MOST OF CENTRAL NORTH DAKOTA...AND A WIND ADVISORY FOR FAR SOUTH CENTRAL AND INTO THE SOUTHERN JAMES RIVER VALLEY. LATEST WATER VAPOR IMAGERY SHOWS A CLOSED LOW CIRCULATION OVER CENTRAL MONTANA WITH A SIGNIFICANT DRY SLOT OVERTAKING WESTERN AND CENTRAL NORTH DAKOTA. SURFACE COLD FRONT PUSHING INTO CENTRAL NORTH DAKOTA AT THIS TIME...WITH UPSTREAM WEST TO SOUTHWEST WINDS 20KT TO 25KT. 997MB SURFACE LOW OVER FAR SOUTHEAST SASKATCHEWAN IS FORECAST TO DEEPEN TODAY AS IT SLOWLY MOVES NORTHEAST INTO WESTERN MANITOBA TUESDAY EVENING. STRONG TEMPERATURE/PRESSURE GRADIENT LEADING TO VERY STRONG WINDS WITHIN THE MIXED LAYER PER NAM/GFS BUFKIT SOUNDINGS TODAY INTO EARLY TONIGHT. WINDS OF 50KT AND 60KT COMMON AT THE TOP OF THE MIXING LAYER. SUSTAINED WINDS AROUND 40 MPH EXPECTED WITH GUSTS TO 60 MPH. THE STRONGEST GUSTS WILL LIKELY BE REALIZED IN THE NORTHWEST AND NORTH CENTRAL...WHERE SCATTERED RAIN SHOWERS WILL HELP TRANSFER HIGHER WINDS TO THE SURFACE. AS MENTIONED ABOVE...A HIGH WIND WARNING COVERS ALL OF WESTERN AND CENTRAL NORTH DAKOTA WITH THE EXCEPTION OF FAR SOUTH CENTRAL AND THE JAMES RIVER VALLEY. WINDS HERE WILL FALL MORE IN LINE WITH WIND ADVISORY CRITERIA...THUS SUSTAINED AROUND 30 MPH WITH GUSTS TO 45 MPH. COULD BE AN ISOLATED LIGHTNING STRIKE FAR NORTH NEAR CROSBY...BUT SOUNDINGS SHOW MINIMAL CAPE AT BEST..THUS WILL KEEP ANY MENTION OF THUNDER OUT OF THE FORECAST TODAY. A LARGE AREA OF RAIN SHOWERS ASSOCIATED WITH THE UPPER LOW PER REGIONAL RADAR WILL TRANSLATE EAST AND NORTHEAST TODAY. WINDS WILL GRADUALLY SUBSIDE THROUGH THE EVENING...WITH SHOWERS BEING MAINTAINED IN THE NORTH THROUGH 06Z WEDNESDAY. .LONG TERM...(WEDNESDAY THROUGH MONDAY) ISSUED AT 321 AM CDT TUE JUL 28 2015 LOW WILL TRANSITION TOWARDS THE NORTHEAST ALONG THE MANITOBA/ONTARIO BORDER ON WEDNESDAY...THROUGH A STRONG ENOUGH PRESSURE GRADIENT WILL REMAIN OVER THE AREA TO BRING A BREEZY DAY. TEMPERATURES WILL REBOUND A BIT...THOUGH STILL REMAIN BELOW AVERAGE. MAINLY DRY WEATHER EXPECTED OVER THE AREA THROUGH THE UPCOMING WEEKEND AS UPPER RIDGE BUILDS OVER THE WESTERN CONUS BRINGING NORTHWESTERLY FLOW TO OUR AREA. NEAR TO SLIGHTLY BELOW AVERAGE TEMPERATURES EXPECTED. MODELS START TO DIFFER ON THE POSITION OF AN UPPER LOW TO THE NORTHEAST TOWARDS THE BEGINNING OF NEXT WEEK. THEREFORE...WILL KEEP SOME LOW PRECIPITATION CHANCES IN THE FORECAST ON MONDAY. && .AVIATION...(FOR THE 12Z TAFS THROUGH 12Z WEDNESDAY MORNING) ISSUED AT 626 AM CDT TUE JUL 28 2015 STRONG WESTERLY WINDS TODAY WILL RESULT IN WIND GUSTS TO AROUND 60 MPH FOR ALL TERMINALS EXCEPT KJMS. KJMS WILL EXPERIENCE WIND GUSTS TO 45 MPH TUESDAY AFTERNOON. OVERALL WINDS SUBSIDE AFTER 06Z BUT STILL RANGE FROM 15KT TO 30KT THROUGH 12Z WEDNESDAY. RAINSHOWERS AND MVFR CIGS ARE FORECAST UNTIL 03Z WEDNESDAY AT KISN. KDIK/KMOT/KBIS WILL ALSO EXPERIENCE MVFR CIGS THROUGH APPROXIMATELY 16Z TUESDAY...BUT REMAINING GENERALLY DRY. HOWEVER THE SHOWERS WILL MOVE INTO KMOT TUESDAY EVENING WITH LOW VFR CIGS. && .BIS WATCHES/WARNINGS/ADVISORIES... HIGH WIND WARNING UNTIL 9 PM CDT /8 PM MDT/ THIS EVENING FOR NDZ001-002-009-010-017>020-031>034-040>044. WIND ADVISORY FROM 3 PM THIS AFTERNOON TO 11 PM CDT THIS EVENING FOR NDZ037-045>048-050-051. HIGH WIND WARNING FROM 1 PM THIS AFTERNOON TO 11 PM CDT THIS EVENING FOR NDZ003>005-011>013-021>023-025-035-036. && UPDATE...WAA SHORT TERM...KS LONG TERM...JJS AVIATION...KS
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE BISMARCK ND 407 AM CDT TUE JUL 28 2015 NDZ001>005-009>013-017>023-025-031>036-040>044-290915- DIVIDE-BURKE-RENVILLE-BOTTINEAU-ROLETTE-WILLIAMS-MOUNTRAIL-WARD- MCHENRY-PIERCE-MCKENZIE-DUNN-MERCER-OLIVER-MCLEAN-SHERIDAN-WELLS- FOSTER-GOLDEN VALLEY-BILLINGS-STARK-MORTON-BURLEIGH-KIDDER-SLOPE- HETTINGER-GRANT-BOWMAN-ADAMS- 407 AM CDT TUE JUL 28 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTH CENTRAL NORTH DAKOTA...NORTHWEST NORTH DAKOTA...SOUTH CENTRAL NORTH DAKOTA...SOUTHEAST NORTH DAKOTA AND SOUTHWEST NORTH DAKOTA. .DAY ONE...TODAY AND TONIGHT A HIGH WIND WARNING IS IN EFFECT FROM MID MORNING TUESDAY INTO TUESDAY EVENING. EXPECT WIND GUSTS TO 60 MPH. PLEASE SEE WWW.WEATHER.GOV/BIS FOR FURTHER DETAILS. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED. NDZ037-045>048-050-051-290915- STUTSMAN-SIOUX-EMMONS-LOGAN-LA MOURE-MCINTOSH-DICKEY- 407 AM CDT TUE JUL 28 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTH CENTRAL NORTH DAKOTA AND SOUTHEAST NORTH DAKOTA. .DAY ONE...TODAY AND TONIGHT A WIND ADVISORY IS IN EFFECT TUESDAY AFTERNOON THROUGH TUESDAY EVENING. WIND GUSTS TO 45 MPH EXPECTED. PLEASE SEE WWW.WEATHER.GOV/BIS FOR FURTHER DETAILS. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED. KS/JJS
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BISMARCK ND
1141 AM CDT TUE JUL 28 2015
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0940 PM TSTM WND GST MARMARTH 46.30N 103.92W
07/27/2015 E60 MPH SLOPE ND TRAINED SPOTTER
TREE BLEW OVER ONTO A GARAGE ROOF RESULTING IN DAMAGE.
NO INJURIES.
&&
ACThe national radar mosaic for the moment the first event began.
30 high wind. Local standard time, as filed.
The RAWS site 30 miles west of Crosby measured a peak gust of 76 mph. Fences and trees were damaged. There was also varying degrees of damage to outbuildings on farms. Crop damage was reported.
A wind gust of 67 mph was measured at Alexander. Fences and trees were damaged. There was also varying degrees of damage to outbuildings on farms. Crop damage was reported.
Stanley AWOS measured a peak gust of 66 mph. Damage to yard furniture was reported.
Dickinson ASOS measured a peak gust of 67 mph. Fences and trees were damaged. There was also varying degrees of damage to outbuildings on farms. Crop damage was reported.
Beach AWOS measured a peak gust of 61 mph.
Hazen AWOS measured a peak gust of 62 mph.
Mandan AWOS measured a peak gust of 69 mph. Fences and trees were damaged. There was also varying degrees of damage to outbuildings on farms. Crop damage was reported.
The NDDOT observation site at Fryburg measured sustained winds of 42 mph.
Lostwood RAWS measured a peak gust of 64 mph.
Tioga AWOS measured a peak gust of 67 mph. Damage occurred to yard furniture and to trees.
The AIRNOW site 5 miles north of Hannover measured sustained winds of 43 mph.
The speed is estimated using the Cannonball Creek RAWS site in eastern Montana near the state line, where a 59 mph gust was reported.
The speed is estimated using the Buffalo ASOS in northwest South Dakota, where a 61 mph gust was reported.
The speed is estimated for northern Adams County using the Hettinger and Dickinson ASOS.
The speed is estimated for northern Hettinger County using the Dickinson ASOS.
The speed is estimated for southern Dunn County using the Dickinson ASOS.
The speed is estimated for eastern Grant County using the Mandan AWOS and the Tatanka Prairie RAWS.
Tatanka Prairie RAWS measured a peak gust of 62 mph.
A few trees were snapped and others had large branches broken off in Lansford.
Long Lake RAWS measured a peak gust of 65 mph.
Harvey AWOS measured a peak gust of 61 mph. Crop damage was reported.
A peak gust of 68 mph was reported at Rugby. Fences and trees were damaged. There was also varying degrees of damage to outbuildings on farms. Crop damage was reported.
Rolla AWOS measured a peak gust of 59 mph.
Minot Air Force Base ASOS measured a peak gust of 63 mph.
The NDDOT observation site at Coleharbor measured a peak gust of 63 mph.
The speed is estimated for eastern Sheridan County using the Harvey AWOS.
The speed is estimated for northern Foster County using the Harvey AWOS and the McHenry NDAWN site in Eddy County.
The speed is estimated for western Kidder County using the Long Lake RAWS in Burleigh County.
The speed is estimated for southern Renville County using the Minot Air Force Base RAWS in Ward County.
A Minot Air Force Base observation station near Velva measured a peak gust of 61 mph.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in North Dakota in 2015Every state in 2015This day in weather historyWarnings in North Dakota, July 2015
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: 595318, 595319, 595320, 595321, 595323, 595327, 595330, 595346, 595347, 595348, 595353, 595357, 595358, 595361, 595362, 595363, 595364, 595322, 595324, 595345, 595349, 595350, 595351, 595352, 595354, 595365, 595367, 595368, 595369, 595370.