public-safety
Severe Thunderstorm Watch issued Sept. 11, 2026 by NWS Sioux Falls SD
Severe Thunderstorm Watch issued September 11 at 6:39PM CDT until September 11 at 10:00PM CDT by NWS Sioux Falls SD. Areas named: Lincoln, MN; Lyon, MN; Pipestone, MN; Rock, MN; Brookings, SD; Lake, SD; McCook, SD; Minnehaha, SD; Moody, SD. Whether this alert is still in effect is shown on the page, computed from its stated expiry when you load it.
Published automatically from public-record data — not yet reviewed by an editor.
Key facts
- What
- Public safety
- When
- Record date Sept. 11, 2026; Added Sept. 12, 2026
- Source
- Weather alerts
- Read time
- About 3 minutes
NWS Sioux Falls SD issued a Severe Thunderstorm Watch at 5:39 p.m. MDT (6:39 p.m. CDT) Sept. 11, 2026, according to the National Weather Service's public alert record.
The alert states that it takes effect at 5:39 p.m. MDT (6:39 p.m. CDT), gives the onset as 5:39 p.m. MDT (6:39 p.m. CDT) and expires at 9 p.m. MDT (10 p.m. CDT). It may reach both of South Dakota's time zones, so each time is given in both.
The alert separately states that the hazard itself ends at 9 p.m. MDT (10 p.m. CDT), which can differ from when the message expires.
Whether this alert is currently in effect is not stated in this text, deliberately: it depends on the time you are reading, so it is computed from the expiry above each time the page is loaded, rather than stored as an answer that would go out of date without anyone noticing. The status shown at the top of this page is the computed one.
The issuing office classified this message as severity "Severe", certainty "Possible" and urgency "Future". Those are the National Weather Service's own categories, reproduced exactly, not re-ranked or translated into another scale.
The recommended response type on the message is "Monitor".
The alert names these areas: Lincoln, Minnesota; Lyon, Minnesota; Pipestone, Minnesota; Rock, Minnesota; Brookings, South Dakota; Lake, South Dakota; McCook, South Dakota; Minnehaha, South Dakota; Moody, South Dakota. The National Weather Service zone codes are MNC081, MNC083, MNC117, MNC133, SDC011, SDC079, SDC087, SDC099 and SDC101.
The full text of the alert as issued at 5:39 p.m. MDT (6:39 p.m. CDT), reproduced without changes:
THE NATIONAL WEATHER SERVICE HAS ISSUED SEVERE THUNDERSTORM WATCH 666 IN EFFECT UNTIL 10 PM CDT THIS EVENING FOR THE FOLLOWING AREAS
IN MINNESOTA THIS WATCH INCLUDES 4 COUNTIES
IN SOUTHWEST MINNESOTA
LINCOLN LYON PIPESTONE ROCK
IN SOUTH DAKOTA THIS WATCH INCLUDES 5 COUNTIES
IN EAST CENTRAL SOUTH DAKOTA
BROOKINGS LAKE MOODY
IN SOUTHEAST SOUTH DAKOTA
MCCOOK MINNEHAHA
THIS INCLUDES THE CITIES OF BRIDGEWATER, BROOKINGS, CANISTOTA, FLANDREAU, HENDRICKS, IVANHOE, LAKE BENTON, LUVERNE, MADISON, MARSHALL, MONTROSE, ORLAND, PIPESTONE, SALEM, SIOUX FALLS, AND TYLER.
The message carries no separate protective-action text.
The National Weather Service superseded this message at 8:10 p.m. MDT (9:10 p.m. CDT) with a later one. This article records the message as issued.
This alert is a work of the United States federal government — the National Weather Service, part of NOAA — and is in the public domain; no copyright is claimed on it and none is asserted here. The alert is reproduced without added meteorological judgement. For live conditions and alerts, go to the National Weather Service.
Only alerts the National Weather Service gave a window of two hours or longer appear here, checked once a day. Short-notice warnings — including tornado and severe thunderstorm warnings, which the service typically issues for under an hour — are NOT carried here, so their absence here says nothing about whether one was issued. For those, and for live conditions, go to the National Weather Service.