Storm Prediction Center Severe Thunderstorm Watch 408
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1 day ago
Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended. Note: Click for Watch Status Reports.
SEL8
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 408
NWS Storm Prediction Center Norman OK
255 PM CDT Wed Jun 11 2025
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Northern Iowa
Southern Minnesota
* Effective this Wednesday afternoon and evening from 255 PM
until 1000 PM CDT.
* Primary threats include...
Scattered damaging winds likely with isolated significant gusts
to 75 mph possible
Scattered large hail events to 1.5 inches in diameter possible
SUMMARY...Clusters and bands of storms should further develop and
intensify this afternoon with wind damage and hail possible as
storms move east-southeastward within an increasingly unstable
environment.
The severe thunderstorm watch area is approximately along and 50
statute miles north and south of a line from 55 miles southwest of
Worthington MN to 70 miles east northeast of Waterloo IA. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU8).
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
1.5 inches. Extreme turbulence and surface wind gusts to 65 knots. A
few cumulonimbi with maximum tops to 500. Mean storm motion vector
28025.
...Guyer
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW8
WW 408 SEVERE TSTM IA MN 111955Z - 120300Z
AXIS..50 STATUTE MILES NORTH AND SOUTH OF LINE..
55SW OTG/WORTHINGTON MN/ - 70ENE ALO/WATERLOO IA/
..AVIATION COORDS.. 45NM N/S /39SSE FSD - 37NNW DBQ/
HAIL SURFACE AND ALOFT..1.5 INCHES. WIND GUSTS..65 KNOTS.
MAX TOPS TO 500. MEAN STORM MOTION VECTOR 28025.
LAT...LON 43819635 43659112 42219112 42369635
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU8.
Watch 408 Status Report Messages:
STATUS REPORT #4 ON WW 408
VALID 120045Z - 120300Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 35 SW ALO TO
20 N ALO TO 30 W LNR.
WW 408 WILL BE ALLOWED TO EXPIRE AT 120300Z.
..SQUITIERI..06/12/25
ATTN...WFO...ARX...DMX...DVN...FSD...MPX...
&&
STATUS REPORT FOR WS 408
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
IAC013-017-019-043-055-061-065-120300-
IA
. IOWA COUNTIES INCLUDED ARE
BLACK HAWK BREMER BUCHANAN
CLAYTON DELAWARE DUBUQUE
FAYETTE
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #3 ON WW 408
VALID 112350Z - 120040Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 40 SE FOD TO
10 SE MCW TO 35 W LNR.
FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 1257
..SQUITIERI..06/11/25
ATTN...WFO...ARX...DMX...DVN...FSD...MPX...
&&
STATUS REPORT FOR WS 408
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
IAC013-017-019-023-037-043-055-061-065-069-075-083-120040-
IA
. IOWA COUNTIES INCLUDED ARE
BLACK HAWK BREMER BUCHANAN
BUTLER CHICKASAW CLAYTON
DELAWARE DUBUQUE FAYETTE
FRANKLIN GRUNDY HARDIN
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #2 ON WW 408
VALID 112245Z - 112340Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 20 S FOD TO
30 WSW MCW TO 20 SE LSE.
..SQUITIERI..06/11/25
ATTN...WFO...ARX...DMX...DVN...FSD...MPX...
&&
STATUS REPORT FOR WS 408
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
IAC005-013-017-019-023-033-037-043-055-061-065-067-069-075-079-
083-089-187-191-197-112340-
IA
. IOWA COUNTIES INCLUDED ARE
ALLAMAKEE BLACK HAWK BREMER
BUCHANAN BUTLER CERRO GORDO
CHICKASAW CLAYTON DELAWARE
DUBUQUE FAYETTE FLOYD
FRANKLIN GRUNDY HAMILTON
HARDIN HOWARD WEBSTER
WINNESHIEK WRIGHT
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #1 ON WW 408
VALID 112240Z - 112340Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 25 SW FOD TO
35 S FRM TO 15 ESE RST.
..SQUITIERI..06/11/25
ATTN...WFO...ARX...DMX...DVN...FSD...MPX...
&&
STATUS REPORT FOR WS 408
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
IAC005-013-017-019-023-033-037-043-055-061-065-067-069-075-079-
081-083-089-091-109-131-187-191-195-197-112340-
IA
. IOWA COUNTIES INCLUDED ARE
ALLAMAKEE BLACK HAWK BREMER
BUCHANAN BUTLER CERRO GORDO
CHICKASAW CLAYTON DELAWARE
DUBUQUE FAYETTE FLOYD
FRANKLIN GRUNDY HAMILTON
HANCOCK HARDIN HOWARD
HUMBOLDT KOSSUTH MITCHELL
WEBSTER WINNESHIEK WORTH
WRIGHT
$$
MNC045-055-112340-
MN
. MINNESOTA COUNTIES INCLUDED ARE
FILLMORE HOUSTON
$$
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.
$$
Probability of 1 or more strong (EF2-EF5) tornadoes
Low (5%)
Wind
Probability of 10 or more severe wind events
High (70%)
Probability of 1 or more wind events > 65 knots
Mod (50%)
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 (90%)
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.
