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EXPIRED Severe Thunderstorm Watch #0664 for Southeast South Dakota
  • Scattered large hail and isolated very large hail events to 2.5 inches in diameter possible
  • Isolated damaging wind gusts to 70 mph possible
  • A tornado or two possible
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EXPIRED Severe Thunderstorm Watch #0664

Locations Affected

  • Southeast South Dakota

    • Severe Thunderstorm Watch #0664 map

    Severe Thunderstorm Watch Summary

    Supercells should pose a threat for mainly large to very large hail this evening into early Tuesday morning as they track generally northeastward across parts of southeast South Dakota. Some severe wind risk may develop if a cluster can form, but this remains uncertain. A tornado or two also appears possible with any supercell that can remain surface-based this evening, but the tendency should be for convection to become mostly elevated with time.

    Severe Weather Threats

  • Scattered large hail and isolated very large hail events to 2.5 inches in diameter possible
  • Isolated damaging wind gusts to 70 mph possible
  • A tornado or two possible

    • Severe Thunderstorm Watch Details

    SEL4

URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 664
NWS Storm Prediction Center Norman OK
705 PM CDT Mon Sep 7 2026

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of 
  Southeast South Dakota

* Effective this Monday night and Tuesday morning from 705 PM
  until 200 AM CDT.

* Primary threats include...
  Scattered large hail and isolated very large hail events to 2.5
    inches in diameter possible
  Isolated damaging wind gusts to 70 mph possible
  A tornado or two possible

SUMMARY...Supercells should pose a threat for mainly large to very
large hail this evening into early Tuesday morning as they track
generally northeastward across parts of southeast South Dakota. Some
severe wind risk may develop if a cluster can form, but this remains
uncertain. A tornado or two also appears possible with any supercell
that can remain surface-based this evening, but the tendency should
be for convection to become mostly elevated with time.

The severe thunderstorm watch area is approximately along and 45
statute miles north and south of a line from 50 miles west southwest
of Mitchell SD to 25 miles north northeast of Sioux Falls SD. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU4).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER...A Severe Thunderstorm Watch means conditions are
favorable for severe thunderstorms in and close to the watch area.
Persons in these areas should be on the lookout for threatening
weather conditions and listen for later statements and possible
warnings. Severe thunderstorms can and occasionally do produce
tornadoes.

&&

OTHER WATCH INFORMATION...CONTINUE...WW 663...

AVIATION...A few severe thunderstorms with hail surface and aloft to
2.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 550. Mean storm motion vector
25025.

...Gleason

    National Risk Overview

    Tuesday, September 8
    TORNADO: 2%
    HAIL: 5%
    WIND: 15%
    Wednesday, September 9
    TORNADO: low
    HAIL: 5%
    WIND: 5%
    Thursday, September 10
    ANY SEVERE: low
    Friday, September 11
    ANY SEVERE: 15%
    Saturday, September 12
    ANY SEVERE: predictability too low
    Sunday, September 13
    ANY SEVERE: predictability too low
    Monday, September 14
    ANY SEVERE: predictability too low
    Tuesday, September 15
    ANY SEVERE: predictability too low

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