Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
Note: Click for
Watch Status Reports.
SEL6
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 436
NWS Storm Prediction Center Norman OK
315 PM EDT Fri Aug 14 2020
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Western Iowa
Southwest Minnesota
Eastern Nebraska
Far southeast South Dakota
* Effective this Friday afternoon and evening from 315 PM until
900 PM EDT.
* Primary threats include...
Scattered large hail and isolated very large hail events to 2
inches in diameter possible
Scattered damaging wind gusts to 70 mph possible
SUMMARY...Cells developing along a cold front should consolidate
into a cluster later this afternoon. Damaging winds will be the
threat, but large hail will be possible mainly through late
afternoon.
The severe thunderstorm watch area is approximately along and 40
statute miles east and west of a line from 55 miles north northeast
of Worthington MN to 40 miles south southeast of Norfolk NE. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU6).
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.
&&
AVIATION...A few severe thunderstorms with hail surface and aloft to
2 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 550. Mean storm motion vector
28030.
...Grams
SEL6
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 436
NWS Storm Prediction Center Norman OK
315 PM EDT Fri Aug 14 2020
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Western Iowa
Southwest Minnesota
Eastern Nebraska
Far southeast South Dakota
* Effective this Friday afternoon and evening from 315 PM until
900 PM EDT.
* Primary threats include...
Scattered large hail and isolated very large hail events to 2
inches in diameter possible
Scattered damaging wind gusts to 70 mph possible
SUMMARY...Cells developing along a cold front should consolidate
into a cluster later this afternoon. Damaging winds will be the
threat, but large hail will be possible mainly through late
afternoon.
The severe thunderstorm watch area is approximately along and 40
statute miles east and west of a line from 55 miles north northeast
of Worthington MN to 40 miles south southeast of Norfolk NE. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU6).
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.
&&
AVIATION...A few severe thunderstorms with hail surface and aloft to
2 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 550. Mean storm motion vector
28030.
...Grams
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW6
WW 436 SEVERE TSTM IA MN NE SD 141915Z - 150100Z
AXIS..40 STATUTE MILES EAST AND WEST OF LINE..
55NNE OTG/WORTHINGTON MN/ - 40SSE OFK/NORFOLK NE/
..AVIATION COORDS.. 35NM E/W /5SSW RWF - 55E OBH/
HAIL SURFACE AND ALOFT..2 INCHES. WIND GUSTS..60 KNOTS.
MAX TOPS TO 550. MEAN STORM MOTION VECTOR 28030.
LAT...LON 44389434 41449636 41449791 44389596
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU6.
Watch 436 Status Report Messages:
STATUS REPORT #2 ON WW 436
VALID 142205Z - 142340Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 5 W OLU TO
20 WSW OTG TO 35 WSW RWF.
..SPC..08/14/20
ATTN...WFO...FSD...OAX...
&&
STATUS REPORT FOR WS 436
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
IAC021-035-041-059-085-093-119-133-141-143-149-155-167-193-
142340-
IA
. IOWA COUNTIES INCLUDED ARE
BUENA VISTA CHEROKEE CLAY
DICKINSON HARRISON IDA
LYON MONONA O'BRIEN
OSCEOLA PLYMOUTH POTTAWATTAMIE
SIOUX WOODBURY
$$
MNC033-063-083-101-105-142340-
MN
. MINNESOTA COUNTIES INCLUDED ARE
COTTONWOOD JACKSON LYON
MURRAY NOBLES
$$
NEC021-023-037-039-043-053-055-141-153-155-167-173-177-142340-
NE
. NEBRASKA COUNTIES INCLUDED ARE
BURT BUTLER COLFAX
CUMING DAKOTA DODGE
DOUGLAS PLATTE SARPY
SAUNDERS STANTON THURSTON
WASHINGTON
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #1 ON WW 436
VALID 142035Z - 142140Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 30 W OLU TO
15 SSW OFK TO 25 WSW SUX TO 30 N SUX TO 30 W OTG TO 45 NE BKX.
..LEITMAN..08/14/20
ATTN...WFO...FSD...OAX...
&&
STATUS REPORT FOR WS 436
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
IAC021-035-041-059-085-093-119-133-141-143-149-155-167-193-
142140-
IA
. IOWA COUNTIES INCLUDED ARE
BUENA VISTA CHEROKEE CLAY
DICKINSON HARRISON IDA
LYON MONONA O'BRIEN
OSCEOLA PLYMOUTH POTTAWATTAMIE
SIOUX WOODBURY
$$
MNC033-063-083-101-105-142140-
MN
. MINNESOTA COUNTIES INCLUDED ARE
COTTONWOOD JACKSON LYON
MURRAY NOBLES
$$
NEC021-023-037-039-043-053-055-141-153-155-167-173-177-142140-
NE
. NEBRASKA COUNTIES INCLUDED ARE
BURT BUTLER COLFAX
CUMING DAKOTA DODGE
DOUGLAS PLATTE SARPY
SAUNDERS STANTON THURSTON
WASHINGTON
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
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 (5%)
|
Wind
Probability of 10 or more severe wind events
|
Mod (50%)
|
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
|
Mod (30%)
|
Combined Severe Hail/Wind
Probability of 6 or more combined severe hail/wind events
|
High (80%)
|
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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