Update – 10:30 a.m.
SIOUX FALLS, S.D. (KELO) — Storms moved out of the Sioux Falls area by 8 a.m. They continued to move to the east this morning into western Minnesota and northwest Iowa.
Several reports of 50-60 mph winds have been noted along with some pockets of nickel size hail. Rain totals have been heavier around Menno and Parkston as shown on the map below. We’ll be working on a complete list of rain totals later today.
These are the numbers as of 7 a.m. at the area airports.
Update – 5:30 a.m.
SIOUX FALLS, S.D. (KELO) — A line of strong to severe thunderstorms continues to march east across KELOLAND as of 5:20am. Expect wind gusts over 60mph in spots and isolated areas of nickel size hail. The severe thunderstorm watch for eastern SD has been expanded to include the Sioux Falls area until 7am. Stay tuned on-air and on-line for the latest information.
Update – 3:45 a.m.
SIOUX FALLS, S.D. (KELO) — We continue to watch a line of severe thunderstorms march into eastern KELOLAND. Severe thunderstorm warnings extend from the Aberdeen area all the way south to Gregory as of 3:40 am. Pockets of penny size hail and wind gusts to 60mph can be expected within this line. We still think this line of storms will get to Sioux Falls, after 5am.
The good news is the rain these storms are bringing to our region. We’ll continue to monitor the developments and relay storm reports through the morning.
Update – 9:50 p.m.
SIOUX FALLS, S.D. (KELO) — Thunderstorms have just begun to materialize in western South Dakota. We have seen 60 mph winds in Spearfish with the first storm cell to enter South Dakota.
A Severe Thunderstorm Watch has been issued for western KELOLAND, areas west of the Missouri River, until 3 a.m.. Forecast models continue to suggest that storms will merge into a north/south line in central South Dakota after midnight, and then continue to move to the east.
Current projections have slowed the movement of the line of storms slightly. Sioux Falls and the I-29 corridor still look like they’ll have thunderstorms after 3 AM.
Greatest concern from a severe standpoint is the potential for 60+ mph winds. But — there could also be a half inch to an inch of desperately needed rainfall.
Update – 4:10 p.m.
Convective activity has begun to fire up along a dry line north of KELOLAND toward the ND/MT border, where a tornado watch will remain in effect this evening. Further south, storms are expected to fire up toward the evening commute in western KELOLAND. Anything that does develop will be encountering a primed air mass with plenty of heat, moisture, and instability in place.
Though no advisories are in place as of 4:00 pm CDT, weather watches are expected to be issued later this evening to the west, likely within the next few hours. From there, we will watch the development of any storms and line segments very carefully.
An Enhanced Risk for severe weather remains in place for a majority of KELOLAND, while the Moderate Risk that was in place as far south as Pierre has now been extended to go as far south as Cherry County, Nebraska.
Additional updates on future weather watches of any variety will be posted here, on our app, as well as on social media.
Original Post – 2:30 p.m.
Hot conditions continue across KELOLAND as we wait for the development of severe weather beginning in western South Dakota this evening. The latest situation features an “enhanced” risk of severe weather for nearly all of South Dakota, with an area west and north of Pierre now upgraded to a moderate risk. Keep in mind these outlooks are subject to change, but we think several factors are pointing toward a severe weather outbreak.
The initial development this evening in the Black Hills region may feature all modes of severe weather including large hail, damaging winds and isolated tornadoes. We expect clusters of thunderstorms to grow into one or two lines of storms that will advance into eastern KELOLAND overnight. This storms will arrive in the Sioux Falls area after 3 a.m. The overnight severe weather threat will primarily feature damaging wind, but we can’t rule out areas of hail. The severity and coverage of the damaging wind will be worse if late evening dew points hold near 70 or above in eastern SD. Even if dew point numbers hold between 65 and 70, pockets of damaging wind are likely through the pre-dawn hours of Friday morning.
These storms will be moving fast and will be occuring while many of you are sleeping. We have had little severe weather East River so far this season, so be intentional about plugging in your weather radio this evening and being weather aware. We encourage you to download our free KELOLAND Live Doppler HD Storm Tracker App and use the radar and severe weather tools that are available.
While we don’t need the severe weather, we will welcome the rain tonight.
As always, feel free to let us know what the weather is doing in your area of KELOLAND. Send us your weather photos and reports to uShare@keloland.com through the evening and overnight.