5 degrees C/km mid-level lapse rates, a weak cluster of thunderstorms developed and moved into the Sioux Falls metro area during the early morning hours. Exceedingly great values of DCAPE aided development of strong downdrafts, with the storm showing the signals of a modified convective heat burst in portions of the city away from the greater precipitation core with damage in isolated spots.
Every event with a place to put it. 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 FSD wrote it up.
In the midst of extremely warm air aloft and 9 to 9.5 degrees C/km mid-level lapse rates, a weak cluster of thunderstorms developed and moved into the Sioux Falls metro area during the early morning hours. Exceedingly great values of DCAPE aided development of strong downdrafts, with the storm showing the signals of a modified convective heat burst in portions of the city away from the greater precipitation core with damage in isolated spots.
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 Sioux Falls, SD wrote its last area forecast discussion before the first event at Jun 20, 5:54 PM CST, 10 hours 4 minutes earlier.
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Service Notice</title>
<link rel="stylesheet" href="index.css">
</head>
<body>
<main class="wrap">
<section class="card" role="status" aria-live="polite">
<div class="status" id="status">Temporary Notice</div>
<h1 id="headline">This service is currently unavailable.</h1>
<p id="message1">
The site you requested is temporarily down for maintenance or an unexpected outage.
</p>
<p id="message2">
Please try again in a few minutes.
</p>
<p class="small" id="detail">
If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
</p>
</section>
</main>
<script src="index.js"></script>
</body>
</html><!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Service Notice</title>
<link rel="stylesheet" href="index.css">
</head>
<body>
<main class="wrap">
<section class="card" role="status" aria-live="polite">
<div class="status" id="status">Temporary Notice</div>
<h1 id="headline">This service is currently unavailable.</h1>
<p id="message1">
The site you requested is temporarily down for maintenance or an unexpected outage.
</p>
<p id="message2">
Please try again in a few minutes.
</p>
<p class="small" id="detail">
If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
</p>
</section>
</main>
<script src="index.js"></script>
</body>
</html>The Sioux Falls radar (KFSD), 10 km away, was scanning. The volume nearest the first event began at 09:58 UTC.
2 thunderstorm wind. Local standard time, as filed.
A couple of birch trees were knocked over by thunderstorm winds, with other large tree limbs down.
The wind was measured at Joe Foss Field in Sioux Falls. A large pine tree was snapped off at a nearby golf course less than one-half mile southwest of the ASOS site.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in South Dakota in 2025Every state in 2025This day in weather historyWarnings in South Dakota, June 2025
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 2026-10-01. Each event’s entry at NCEI: 1278486, 1278487.