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 284
NWS Storm Prediction Center Norman OK
955 PM CDT Sat May 28 2022
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
South-Central and Southeast South Dakota
* Effective this Saturday night and Sunday morning from 955 PM
until 300 AM CDT.
* Primary threats include...
Scattered large hail events to 1.5 inches in diameter possible
Isolated damaging wind gusts to 70 mph possible
SUMMARY...At least isolated severe thunderstorms should develop
east-northeastward across additional portions of south-central into
South Dakota late this evening and early in the overnight.
The severe thunderstorm watch area is approximately along and 45
statute miles east and west of a line from 30 miles northeast of
Chamberlain SD to 55 miles south southeast of Chamberlain 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 281...WW 282...WW 283...
AVIATION...A few severe thunderstorms with hail surface and aloft to
1.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 500. Mean storm motion vector
25030.
...Guyer
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW4
WW 284 SEVERE TSTM SD 290255Z - 290800Z
AXIS..45 STATUTE MILES EAST AND WEST OF LINE..
30NE 9V9/CHAMBERLAIN SD/ - 55SSE 9V9/CHAMBERLAIN SD/
..AVIATION COORDS.. 40NM E/W /58ESE PIR - 35NNW ONL/
HAIL SURFACE AND ALOFT..1.5 INCHES. WIND GUSTS..60 KNOTS.
MAX TOPS TO 500. MEAN STORM MOTION VECTOR 25030.
LAT...LON 44079799 43039801 43039979 44079980
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU4.
Watch 284 Status Report Messages:
STATUS REPORT #2 ON WW 284
VALID 290435Z - 290540Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 45 NE ANW TO
20 N 9V9.
..SPC..05/29/22
ATTN...WFO...FSD...ABR...
&&
STATUS REPORT FOR WS 284
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
SDC003-015-017-023-035-043-053-073-111-290540-
SD
. SOUTH DAKOTA COUNTIES INCLUDED ARE
AURORA BRULE BUFFALO
CHARLES MIX DAVISON DOUGLAS
GREGORY JERAULD SANBORN
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #1 ON WW 284
VALID 290335Z - 290440Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
..SPC..05/29/22
ATTN...WFO...FSD...ABR...
&&
STATUS REPORT FOR WS 284
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
SDC003-015-017-023-035-043-053-073-085-111-290440-
SD
. SOUTH DAKOTA COUNTIES INCLUDED ARE
AURORA BRULE BUFFALO
CHARLES MIX DAVISON DOUGLAS
GREGORY JERAULD LYMAN
SANBORN
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
Note:
Click for Complete Product Text.
Tornadoes
Probability of 2 or more tornadoes
|
Low (10%)
|
Probability of 1 or more strong (EF2-EF5) tornadoes
|
Low (<2%)
|
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 (40%)
|
Probability of 1 or more hailstones > 2 inches
|
Low (10%)
|
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.
weather.gov 
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