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cat $HOME/public_html/posts/storm-prediction-center-severe-thunderstorm-watch-664.txt >> story.html | parse_story story.html; rm -f storm-prediction-center-severe-thunderstorm-watch-664.txt story.html
Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
Note: Click for Watch Status Reports.
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
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
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW4 WW 664 SEVERE TSTM SD 080005Z - 080700Z AXIS..45 STATUTE MILES NORTH AND SOUTH OF LINE.. 50WSW MHE/MITCHELL SD/ - 25NNE FSD/SIOUX FALLS SD/ ..AVIATION COORDS.. 40NM N/S /62N ONL - 19NNE FSD/ HAIL SURFACE AND ALOFT..2.5 INCHES. WIND GUSTS..60 KNOTS. MAX TOPS TO 550. MEAN STORM MOTION VECTOR 25025. LAT...LON 44149895 44579654 43269654 42849895 THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS FOR WOU4.
Watch 664 Status Report Messages:
STATUS REPORT #1 ON WW 664 VALID 080145Z - 080240Z THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA. ..CHALMERS..09/08/26 ATTN...WFO...FSD... && STATUS REPORT FOR WS 664 SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS SDC003-009-011-023-027-035-043-053-061-067-077-079-083-087-097- 099-101-111-125-135-080240- SD . SOUTH DAKOTA COUNTIES INCLUDED ARE AURORA BON HOMME BROOKINGS CHARLES MIX CLAY DAVISON DOUGLAS GREGORY HANSON HUTCHINSON KINGSBURY LAKE LINCOLN MCCOOK MINER MINNEHAHA MOODY SANBORN TURNER YANKTON $$ THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES. $$
Note:
Click for Complete Product Text.
Tornadoes
| Probability of 2 or more tornadoes |
Low (20%) |
| Probability of 1 or more strong (EF2-EF5) tornadoes |
Low (10%) |
Wind
| Probability of 10 or more severe wind events |
Mod (30%) |
| Probability of 1 or more wind events > 65 knots |
Low (20%) |
Hail
| Probability of 10 or more severe hail events |
Mod (50%) |
| Probability of 1 or more hailstones > 2 inches |
Mod (40%) |
Combined Severe Hail/Wind
| Probability of 6 or more combined severe hail/wind events |
High (70%) |
For each watch, probabilities for particular events inside the watch
(listed above in each table) are determined by the issuing forecaster.
The “Low” category contains probability values ranging from less than 2%
to 20% (EF2-EF5 tornadoes), less than 5% to 20% (all other probabilities),
“Moderate” from 30% to 60%, and “High” from 70% to greater than 95%.
High values are bolded and lighter in color to provide awareness of
an increased threat for a particular event.