{"id":33295,"date":"2021-06-10T00:00:26","date_gmt":"2021-06-10T08:00:26","guid":{"rendered":"http:\/\/stormbruiser.com\/chase\/?p=33295"},"modified":"2021-12-13T21:16:48","modified_gmt":"2021-12-14T05:16:48","slug":"june-10-2021-western-north-dakota-supercell-and-tornados","status":"publish","type":"post","link":"https:\/\/stormbruiser.com\/chase\/2021\/06\/10\/june-10-2021-western-north-dakota-supercell-and-tornados\/","title":{"rendered":"June 10, 2021 Western North Dakota Supercells and Tornados"},"content":{"rendered":"

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Begin: \u00a0Glasgow, MT\/lunch: \u00a0Sidney, MT (Sunny’s Family Restaurant)\/End: \u00a0Dickinson, ND\/318 miles<\/strong><\/p>\n

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Rough chase route above, beginning with Lunch (L) at Sidney, MT. \u00a0An “X” marks the primary supercell and tornado-viewing locations.<\/p>\n

June 10\u00a0Storm Reports<\/a><\/p>\n

SPC Day One\/20Z<\/a><\/p>\n

SPC Mesoscale Discussion 907 (with a good surface map)<\/a><\/p>\n

SPC Mesoscale Discussion 908<\/a>\u00a0 \u00a0SPC Mesoscale Discussion 909<\/a>\u00a0 \u00a0SPC Mesoscale Discussion 910<\/a><\/p>\n

SPC Mesoscale Discussion 911<\/a>\u00a0 \u00a0SPC Mesoscale Discussion 913<\/a>\u00a0 \u00a0SPC Mesoscale Discussion <\/a>914<\/a><\/p>\n

SPC Mesoscale Discussion 915<\/a>\u00a0 \u00a0SPC Mesoscale Discussion 916<\/a>\u00a0 \u00a0SPC Mesoscale Discussion 918<\/a><\/p>\n

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21Z\/3 p.m. MDT surface map and approximate tornado locations (red Ts)<\/p>\n

Time Lapse video of the chase by Chris Gullikson for Tempest Tours<\/a><\/strong><\/p>\n

Time Lapse Video of the Squaw Gap \u00a0supercell and tornado by TT guest Richard Rostant<\/a><\/strong><\/p>\n

Zoom time-lapse (4X) of Squaw Gap tornado by Chris<\/a><\/strong><\/p>\n

Time Lapse of Second Tornadic Supercell by Chris<\/a><\/strong><\/p>\n

Zoomed-in video of action area of Second Supercell with tornado by Chris<\/a><\/strong><\/p>\n

Big-time moisture and upper-level energy were the featured weather parameters today for areas along and near the Montana\/North Dakota border. \u00a0Tornadoes looked like a pretty good bet, especially just north and northeast of a surface low which was slightly southwest of Sidney, in extreme east-central Montana. \u00a0North of this surface low, winds were backed very nicely. \u00a0For instance, from about Alexander to Williston, in northwestern North Dakota, wind at 21Z (see map above) was from the ESE at about 20 knots, with dews nearing 70F! \u00a0With strong mid-level flow from the S and SSW at or above 40 knots and plenty of clear skies midday, the stage was set for an active afternoon and evening. \u00a0After 30 years of chasing, I had yet to witness a tornado in North Dakota, so maybe today would be the day. \u00a0SPC slapped a 10 percent tornado risk along the ND\/MT border from about Sidney northward, right where those nicely backed winds were blowing.<\/p>\n

I was returning to the tour group following a week of some rest and recharging. \u00a0 Chris and company (Matt and Kim and the tour guests) were enjoying the first few days of Tour 6. \u00a0I started the day in Wibaux, Montana, and called Chris mid-morning to figure out our meeting point. \u00a0His group was starting the day in Glasgow, following a successful supercell intercept near Hays, MT, the previous day. \u00a0We decided to meet in Sidney, MT, for lunch. \u00a0This seemed to be a good starting point for today’s chase, as Sidney was privy to those very moist and backed winds, northeast of the surface low. \u00a0My drive north was an easy one, and the gang was already eating when I got to Sidney.<\/p>\n

Shortly after lunch, we drifted south of Sidney just a little bit to watch some bubbling cumulus not far to the SSW. \u00a0This activity was above hot air near the center of the surface low. \u00a0Check out these surface plots for 2 p.m. MDT (click to enlarge):<\/p>\n

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The surface convergence near Glendive, with a WSW wind and 102F temperature, was very strong! \u00a0The initial updrafts were scrawny with high bases. \u00a0These just needed to scoot north in order to tap the moist surface air and big CAPE. \u00a0After an hour or so we were on the north side of Sidney, about halfway to Fairview. \u00a0I found a hilltop, and I think we watched a weak cell or two pass by to the west and then north. \u00a0 These were not worth staying with. \u00a0 Eventually, the much more substantial anchor storm to our SSW became very apparent. \u00a0It quickly sported a circular base and large area of forward-flank precipitation — see last three images below.<\/p>\n

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