7/13/09 Now: MT/ND/SD/WY

[Nick Hartley]

While the main focus of the day is still to the west, on-going activity in the Western Dakotas have warranted a Severe Thunderstorm Watch until 5:00CDT/4:00MDT. Surprised there hasn't been more talk about this area, with a 10% tor chance. Current threats are for large hail, but tornadoes will become a threat later this afternoon. Strong cell currently affecting Ziebach County, SD near Dupree. Ongoing activity may, warrant upgrading 1630Z Convective Outlook to moderate over this area.

Personally hoping for some of this activity to move east and give me a chance to chase for my birthday

 

[Jeff Piotrowski]

Storm 25 SW of Faith SD at 3:00 PM

This storm has increasing tornado threat as it moves South of Faith SD.

 

[Andrew Stoller]

http://www.severestudios.com/cgi-bin/player.pl?username=andy.gabrielson&uid=140

Andy Gabrielson has a developing funnel with a nice RFD clear slot cutting into the base of the t-warned cell in S. Dakota.

:edit: my apologies, that was an old shot.

 

[Jeff Duda]

The storm appears to have developed a DRC right now.

 

[Stuart Robinson]

That cell over Cotton Wood, SD looks a prime tornado producer right now .

 

[Mike Hollingshead]

Pretty decent high based structure on Kadoka storm. I've never in my life seen so many CGs from one localized area over and over and over, in the ol area of interest. Never seen that on and on.

Must be cycling, had a nice wrapped up area but lost it, now struggling to get that back.

4:40 new wall cloud just west of Kadoka. Strange high based structure with it though.

 

[David Reimer]

Looks like another DRC is in progress at this time.

 

[Jeff Duda]

Although the rotation doesn't look so impressive right now, the hail icons have really increased on the storm. Now up close to 4 inch estimated hail and tops approaching 60000 ft.

 

[Bill Schintler]

SD storms

While no one on the SD storm is obviously going to let it go at this point, it's important to keep an eye on new development further west. The main show could be yet to come, as a second wave - as evidenced by new convection in WY, reaches western SD. Just N of the Black Hills, hodographs are locally enhanced due to storm outflow; and the atmosphere has reloaded nicely in the wake of earlier convection, with MLCAPEs pushing 4000J/kg. Convection should rapidly increase in coverage and intensity from west to east as high-based storms over WY encounter deeper moisture E of the SD/WY border and mid-level cooling takes place.

- bill
4:43 PM CDT, 07/13/09

 

[Dean Baron]

The 2 storms just east of Rapid City are cycling nicely. The southern cell has a huge core, I bailed on it because of that. Getting good time lapse video of the northern storm. The northern storm is somewhat soft in appearance and there isnt much of a base, but I think it still has a shot at producing as more crisp towers are starting to develop. The southern storm had a beautiful meso on it for a while.

 

[Mark Farnik]

I'm currently sitting at a gas station just off I-90 in Sturgis, SD. I'm biding my time and keeping a watchful eye on two supercells that have developed in association with the main shortwave trough in northeastern Wyoming - the first in northwestern Crook County, northwest of Sundance, WY and the second on the Weston/Crook County line southeast of Moorcroft, WY.

The first cell, which is especially nasty (and promising) looking will cross the WY/SD state line in about an hour and a half's time and will pass just north of Belle Fourche, tracking towards the Fruitland/Newell, SD area, and the second storm is tracking east/northeast and will cross the state line in about an hour's time southwest of Belle Fourche and west of Spearfish.

Once these two cells cross into South Dakota and interact with the warm front/encounter the pocket of 4000 j/kg CAPE and 300+ SRH just north and east of the Black Hills, the storms will more than likely go absolutely gangbusters. I'm going to move northwest along I-90 to Spearfish and waiting for the big show to begin...

 

[Nick Hartley]

This just came across the wire.

AT 637 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR AND STORM SPOTTERS WERE TRACKING A LARGE AND EXTREMELY DANGEROUS TORNADO. THIS DANGEROUS STORM WAS LOCATED NEAR ALADDIN...OR 15 MILES NORTHEAST OF SUNDANCE...MOVING EAST AT 30 MPH.

 

[David Reimer]

Level 3 Velocity is maxed out (-71 G2G +71) at 4200 Feet. As of 0125Z It was 7 SW of Valentine, NE. No reports in yet of anything but Im sure its quite a sight.

0126Z: Funnel Cloud just reported. Also, a rather strongly worded statement in the TOR Warning.

IN ADDITION TO THE TORNADO...THIS STORM IS CAPABLE OF PRODUCING
BASEBALL SIZE HAIL AND DESTRUCTIVE STRAIGHT LINE WINDS EXCEEDING 100
MPH.

 

[Brian Stertz]

Yep another Cherry Co. sand hill monster in no-man's land. Wow it's really wrapped up with TVS.... and what looks like another powerful rfd cycle.

 

[bwalker]

An hour later after D. Reimer's post (at 8:14pm) there is another couplet w/ -71 gtg +71
per Level 3 Velocity just a little farther south of Valentine. There are some butt-kicking velocities associated with this slow-moving storm complex in the Valentine area tonight.