Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
Note: Click for
Watch Status Reports.
SEL7
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 677
NWS Storm Prediction Center Norman OK
210 PM CDT Thu Sep 19 2024
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Northern Iowa
Southern and East-Central Minnesota
Western Wisconsin
* Effective this Thursday afternoon and evening from 210 PM until
1000 PM CDT.
* Primary threats include...
Scattered large hail likely with isolated very large hail events
to 2.5 inches in diameter possible
Scattered damaging wind gusts to 70 mph possible
A tornado or two possible
SUMMARY...Thunderstorms should continue to develop this afternoon
while posing a threat for large hail up to 1.5-2.5 inches in
diameter. As this activity spreads east-northeastward, damaging
winds around 60-70 mph may become more of a threat through this
evening, especially if thunderstorms can form into clusters. A
tornado or two also appears possible with any persistent,
surface-based supercell.
The severe thunderstorm watch area is approximately along and 75
statute miles east and west of a line from 45 miles north northwest
of Eau Claire WI to 15 miles southwest of Mason City IA. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU7).
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
2.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 500. Mean storm motion vector
24030.
...Gleason
SEL7
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 677
NWS Storm Prediction Center Norman OK
210 PM CDT Thu Sep 19 2024
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Northern Iowa
Southern and East-Central Minnesota
Western Wisconsin
* Effective this Thursday afternoon and evening from 210 PM until
1000 PM CDT.
* Primary threats include...
Scattered large hail likely with isolated very large hail events
to 2.5 inches in diameter possible
Scattered damaging wind gusts to 70 mph possible
A tornado or two possible
SUMMARY...Thunderstorms should continue to develop this afternoon
while posing a threat for large hail up to 1.5-2.5 inches in
diameter. As this activity spreads east-northeastward, damaging
winds around 60-70 mph may become more of a threat through this
evening, especially if thunderstorms can form into clusters. A
tornado or two also appears possible with any persistent,
surface-based supercell.
The severe thunderstorm watch area is approximately along and 75
statute miles east and west of a line from 45 miles north northwest
of Eau Claire WI to 15 miles southwest of Mason City IA. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU7).
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
2.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 500. Mean storm motion vector
24030.
...Gleason
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW7
WW 677 SEVERE TSTM IA MN WI 191910Z - 200300Z
AXIS..75 STATUTE MILES EAST AND WEST OF LINE..
45NNW EAU/EAU CLAIRE WI/ - 15SW MCW/MASON CITY IA/
..AVIATION COORDS.. 65NM E/W /37NNW EAU - 11WSW MCW/
HAIL SURFACE AND ALOFT..2.5 INCHES. WIND GUSTS..60 KNOTS.
MAX TOPS TO 500. MEAN STORM MOTION VECTOR 24030.
LAT...LON 45469029 42999206 42999502 45469338
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU7.
Watch 677 Status Report Messages:
STATUS REPORT #3 ON WW 677
VALID 200115Z - 200240Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 20 SSE MCW
TO 20 S RST TO 15 WNW LSE TO 30 ESE MSP TO 65 NE MSP.
FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 289
..THORNTON..09/20/24
ATTN...WFO...DMX...ARX...MPX...
&&
STATUS REPORT FOR WS 677
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
IAC037-067-089-191-200240-
IA
. IOWA COUNTIES INCLUDED ARE
CHICKASAW FLOYD HOWARD
WINNESHIEK
$$
MNC055-200240-
MN
. MINNESOTA COUNTIES INCLUDED ARE
HOUSTON
$$
WIC005-017-019-033-035-053-063-091-093-095-107-109-119-121-
200240-
WI
. WISCONSIN COUNTIES INCLUDED ARE
BARRON CHIPPEWA CLARK
DUNN EAU CLAIRE JACKSON
LA CROSSE PEPIN PIERCE
POLK RUSK ST. CROIX
TAYLOR TREMPEALEAU
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #2 ON WW 677
VALID 192320Z - 200040Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 15 ENE FOD
TO 35 N MCW TO 55 NNE MSP.
..THORNTON..09/19/24
ATTN...WFO...DMX...ARX...MPX...
&&
STATUS REPORT FOR WS 677
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
IAC033-037-067-089-131-191-195-200040-
IA
. IOWA COUNTIES INCLUDED ARE
CERRO GORDO CHICKASAW FLOYD
HOWARD MITCHELL WINNESHIEK
WORTH
$$
MNC039-045-047-049-055-099-109-131-147-157-163-169-200040-
MN
. MINNESOTA COUNTIES INCLUDED ARE
DODGE FILLMORE FREEBORN
GOODHUE HOUSTON MOWER
OLMSTED RICE STEELE
WABASHA WASHINGTON WINONA
$$
WIC005-011-017-019-033-035-053-063-091-093-095-107-109-119-121-
200040-
WI
. WISCONSIN COUNTIES INCLUDED ARE
BARRON BUFFALO CHIPPEWA
CLARK DUNN EAU CLAIRE
JACKSON LA CROSSE PEPIN
PIERCE POLK RUSK
ST. CROIX TAYLOR TREMPEALEAU
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #1 ON WW 677
VALID 192040Z - 192140Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
..KERR..09/19/24
ATTN...WFO...DMX...ARX...MPX...
&&
STATUS REPORT FOR WS 677
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
IAC033-037-063-067-081-089-109-131-147-189-191-195-192140-
IA
. IOWA COUNTIES INCLUDED ARE
CERRO GORDO CHICKASAW EMMET
FLOYD HANCOCK HOWARD
KOSSUTH MITCHELL PALO ALTO
WINNEBAGO WINNESHIEK WORTH
$$
MNC003-013-019-025-037-039-043-045-047-049-053-055-059-079-091-
099-103-109-123-131-139-143-147-157-161-163-169-192140-
MN
. MINNESOTA COUNTIES INCLUDED ARE
ANOKA BLUE EARTH CARVER
CHISAGO DAKOTA DODGE
FARIBAULT FILLMORE FREEBORN
GOODHUE HENNEPIN HOUSTON
ISANTI LE SUEUR MARTIN
MOWER NICOLLET OLMSTED
RAMSEY RICE SCOTT
SIBLEY STEELE WABASHA
WASECA WASHINGTON WINONA
$$
WIC005-011-017-019-033-035-053-063-091-093-095-107-109-119-121-
192140-
WI
. WISCONSIN COUNTIES INCLUDED ARE
BARRON BUFFALO CHIPPEWA
CLARK DUNN EAU CLAIRE
JACKSON LA CROSSE PEPIN
PIERCE POLK RUSK
ST. CROIX TAYLOR TREMPEALEAU
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
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 (50%)
|
Probability of 1 or more wind events > 65 knots
|
Low (20%)
|
Hail
Probability of 10 or more severe hail events
|
Mod (60%)
|
Probability of 1 or more hailstones > 2 inches
|
Mod (50%)
|
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 
@NWSSPC
