Eastern South Dakota is under the gun for severe weather tonight. Stay with argusleader.com for frequent updates.
Severe thunderstorm warning issued for Sioux Falls, Brandon, Madison
Update 4:40 pm: A “life threatening” severe thunderstorm warning has been issued for Sioux Falls and the surrounding area, according to the National Weather Service.
The warning lasts until 5:30 pm, according to the NWS.
Winds are expected to be up to 80 mph and a penny-sized hail is possible, according to the NWS. A tornado is also possible during this time.
In the area are Sioux Falls, Brandon, Dell Rapids, Harrisburg, Wakonda, Canistota and Madison, according to the warning.
Severe thunderstorm watch issued for eastern South Dakota with winds up to 105: NWS
Update: 4:15 pm: A “particularly dangerous situation” severe thunderstorm watch has been issued for southeastern South Dakota and parts of western Iowa and Minnesota until 10 pm
Widespread gusts up to 105 mph are possible with potential damage from scattered hail up to two-inches in size and a couple possible tornadoes.
In the alert, the NWS stated it was a particularly dangerous situation, language that is rarely used for severe thunderstorm watches.
“Pockets of significant wind damage are highly likely, along with the potential for large hail and possible a line-embedded tornado or two,” the NWS said in its watch issuance.
The watch includes the South Dakota cities of Mitchell, Madison, Sioux Falls, Yankton and Vermillion.
Tornado watch issued for Brookings, Aberdeen and Pierre: NWS
Update: 4 pm: A tornado watch has been issued until 10 pm for parts of central and northern South Dakota, according to the NWS.
Aberdeen, Brookings, Pierre and Watertown are all under a tornado watch, according to the NWS. A couple strong tornadoes are possible along with scattered hail up to the size of a tennis ball.
Wind gusts are expected to be up to 90 mph, according to the NWS.
South Dakota weather updates from Twitter
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Eastern South Dakota upgraded to ‘moderate risk’
Update 3:00 pm: The National Weather Service has updated the convective outlook for severe weather in the Sioux Falls region on Thursday.
There’s currently a moderate risk of severe weather, according to the NWS.
For southeastern South Dakota, large hail and winds in excess of 80 mph are the main risks, with tornadoes possible in the central and northeastern part of the state.
Severe weather set for South Dakota today
The region is set for another round of severe weather Thursday afternoon and evening.
The day will start with above-average temperatures, with the NWS in Sioux Falls forecasting the city’s maximum heat index to be in the 90s, nearing the record high set in 1907.
Later tonight, the NWS is forecasting a “moderate” risk of severe weather for parts of eastern South Dakota, which is fourth on a five-point scale of severe weather risks.
Damaging winds, large hail and even a tornado or two are possible, with the tornado threat greater in northeastern South Dakota.
What’s the forecast for South Dakota today?
Scattered thunderstorms could develop in central South Dakota and Nebraska by the late afternoon, according to the NWS.
Storms will merge into a line as they approach the Interstate Highway 29 corridor by the early evening. Threats with the strongest storms will include very large hail and damaging winds, according to the NWS.
Due to recent and expected heavy rain, flash flooding is possible in some areas. A few tornadoes and high temperatures near record values and heat index values in the 90s this afternoon are also possible, according to the NWS.
Winds could be in excess of 80 mph with the storms, the NWS says.
When could the severe weather start?
The timeline for severe weather risks in Sioux Falls and surrounding areas is from 4 pm Thursday to 1 am Friday, according to the NWS. The main risk for severe weather will be from 5 pm to 11 pm Thursday in eastern South Dakota.
Up to 2 inches of rain are possible in Sioux Falls and surrounding areas.
A look at the forecast for the days ahead in Sioux Falls, according to the NWS:
Thursday Night: Showers and thunderstorms, especially before 1 am Friday. Some of the storms could be severe. Low around 54. Breezy, with a south southwest wind 15 to 20 mph decreasing to 10 to 15 mph in the evening. Winds could gust as high at 35 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Friday: Sunny, with a high near 76. West southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Friday Night: Mostly clear, with a low around 51. West wind 5 to 10 mph becoming south after midnight.
Saturday: Mostly sunny, with a high near 76. South southwest wind 5 to 10 mph becoming west northwest in the afternoon.
Saturday Night: A slight chance of showers and thunderstorms after 1 am Sunday. Partly cloudy, with a low around 49. North wind 5 to 10 mph. Chance of precipitation is 20%.
Sunday: Sunny, with a high near 74.
Sunday Night: Mostly clear, with a low around 48.
Monday: Sunny, with a high near 74.
Monday Night: The chance of showers and thunderstorms after 1 am Tuesday. Partly cloudy, with a low around 50. Chance of precipitation is 30%.
Tuesday: Partly sunny, with a high near 72.
Tuesday Night: The chance of showers and thunderstorms. Partly cloudy, with a low around 53. Chance of precipitation is 30%.
Wednesday: The chance of showers and thunderstorms. Partly sunny, with a high near 73. Chance of precipitation is 30%.
Got a story idea from your community? Email reporter Alfonzo Galvan at agalvan@argusleader.com or follow him on Twitter @GalvanReports.