Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
Note: Click for
Watch Status Reports.
SEL5
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 655
NWS Storm Prediction Center Norman OK
505 PM CDT Thu Aug 24 2023
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Northeast Illinois
Southern Wisconsin
Lake Michigan
* Effective this Thursday afternoon and evening from 505 PM until
1000 PM CDT.
* Primary threats include...
Scattered damaging winds and isolated significant gusts to 80
mph possible
Isolated very large hail events to 2 inches in diameter possible
A tornado or two possible
SUMMARY...Thunderstorms are rapidly developing across southern
Wisconsin. These storms will track southeastward across the watch
area this afternoon and early evening, posing a risk of locally
damaging wind gusts and hail.
The severe thunderstorm watch area is approximately along and 80
statute miles east and west of a line from 35 miles west northwest
of Milwaukee WI to 30 miles southeast of Janesville WI. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU5).
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 654...
AVIATION...A few severe thunderstorms with hail surface and aloft to
2 inches. Extreme turbulence and surface wind gusts to 70 knots. A
few cumulonimbi with maximum tops to 500. Mean storm motion vector
24035.
...Hart
SEL5
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 655
NWS Storm Prediction Center Norman OK
505 PM CDT Thu Aug 24 2023
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Northeast Illinois
Southern Wisconsin
Lake Michigan
* Effective this Thursday afternoon and evening from 505 PM until
1000 PM CDT.
* Primary threats include...
Scattered damaging winds and isolated significant gusts to 80
mph possible
Isolated very large hail events to 2 inches in diameter possible
A tornado or two possible
SUMMARY...Thunderstorms are rapidly developing across southern
Wisconsin. These storms will track southeastward across the watch
area this afternoon and early evening, posing a risk of locally
damaging wind gusts and hail.
The severe thunderstorm watch area is approximately along and 80
statute miles east and west of a line from 35 miles west northwest
of Milwaukee WI to 30 miles southeast of Janesville WI. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU5).
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 654...
AVIATION...A few severe thunderstorms with hail surface and aloft to
2 inches. Extreme turbulence and surface wind gusts to 70 knots. A
few cumulonimbi with maximum tops to 500. Mean storm motion vector
24035.
...Hart
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW5
WW 655 SEVERE TSTM IL WI LM 242205Z - 250300Z
AXIS..80 STATUTE MILES EAST AND WEST OF LINE..
35WNW MKE/MILWAUKEE WI/ - 30SE JVL/JANESVILLE WI/
..AVIATION COORDS.. 70NM E/W /12W BAE - 38WNW ORD/
HAIL SURFACE AND ALOFT..2 INCHES. WIND GUSTS..70 KNOTS.
MAX TOPS TO 500. MEAN STORM MOTION VECTOR 24035.
LAT...LON 43138695 42308705 42309018 43139013
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU5.
Watch 655 Status Report Messages:
STATUS REPORT #4 ON WW 655
VALID 250140Z - 250240Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 15 SSW JVL
TO 35 NW BEH.
..THORNTON..08/25/23
ATTN...WFO...LOT...MKX...
&&
STATUS REPORT FOR WS 655
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
ILC007-097-111-250240-
IL
. ILLINOIS COUNTIES INCLUDED ARE
BOONE LAKE MCHENRY
$$
LMZ740-777-250240-
CW
. ADJACENT COASTAL WATERS INCLUDED ARE
WINTHROP HARBOR TO WILMETTE HARBOR IL
LAKE MICHIGAN FROM WINTHROP HARBOR TO WILMETTE HARBOR IL 5NM
OFFSHORE TO MID LAKE
$$
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.
$$
STATUS REPORT #3 ON WW 655
VALID 250140Z - 250240Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 15 SSW JVL
TO 35 NW BEH.
..THORNTON..08/25/23
ATTN...WFO...LOT...MKX...
&&
STATUS REPORT FOR WS 655
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
ILC007-097-111-250240-
IL
. ILLINOIS COUNTIES INCLUDED ARE
BOONE LAKE MCHENRY
$$
LMZ740-777-250240-
CW
. ADJACENT COASTAL WATERS INCLUDED ARE
WINTHROP HARBOR TO WILMETTE HARBOR IL
LAKE MICHIGAN FROM WINTHROP HARBOR TO WILMETTE HARBOR IL 5NM
OFFSHORE TO MID LAKE
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #2 ON WW 655
VALID 250030Z - 250140Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 30 NNE DBQ
TO 20 NNW JVL TO 10 ENE RAC TO 50 SSE MTW.
..THORNTON..08/25/23
ATTN...WFO...LOT...MKX...
&&
STATUS REPORT FOR WS 655
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
ILC007-097-111-250140-
IL
. ILLINOIS COUNTIES INCLUDED ARE
BOONE LAKE MCHENRY
$$
WIC045-059-065-101-105-127-250140-
WI
. WISCONSIN COUNTIES INCLUDED ARE
GREEN KENOSHA LAFAYETTE
RACINE ROCK WALWORTH
$$
LMZ646-673-675-740-777-250140-
CW
. ADJACENT COASTAL WATERS INCLUDED ARE
WIND POINT WI TO WINTHROP HARBOR IL
LAKE MICHIGAN FROM NORTH POINT LIGHT TO WIND POINT WI 5NM
OFFSHORE TO MID LAKE
LAKE MICHIGAN FROM WIND POINT WI TO WINTHROP HARBOR IL 5NM
OFFSHORE TO MID LAKE
WINTHROP HARBOR TO WILMETTE HARBOR IL
LAKE MICHIGAN FROM WINTHROP HARBOR TO WILMETTE HARBOR IL 5NM
OFFSHORE TO MID LAKE
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #1 ON WW 655
VALID 242320Z - 250040Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
..THORNTON..08/24/23
ATTN...WFO...LOT...MKX...
&&
STATUS REPORT FOR WS 655
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
ILC007-097-111-250040-
IL
. ILLINOIS COUNTIES INCLUDED ARE
BOONE LAKE MCHENRY
$$
WIC025-045-049-055-059-065-079-101-105-127-133-250040-
WI
. WISCONSIN COUNTIES INCLUDED ARE
DANE GREEN IOWA
JEFFERSON KENOSHA LAFAYETTE
MILWAUKEE RACINE ROCK
WALWORTH WAUKESHA
$$
LMZ644-645-646-671-673-675-740-777-250040-
CW
. ADJACENT COASTAL WATERS INCLUDED ARE
PORT WASHINGTON TO NORTH POINT LIGHT WI
NORTH POINT LIGHT TO WIND POINT WI
WIND POINT WI TO WINTHROP HARBOR IL
LAKE MICHIGAN FROM PORT WASHINGTON TO NORTH POINT LIGHT WI 5NM
OFFSHORE TO MID LAKE
LAKE MICHIGAN FROM NORTH POINT LIGHT TO WIND POINT WI 5NM
OFFSHORE TO MID LAKE
LAKE MICHIGAN FROM WIND POINT WI TO WINTHROP HARBOR IL 5NM
OFFSHORE TO MID LAKE
WINTHROP HARBOR TO WILMETTE HARBOR IL
LAKE MICHIGAN FROM WINTHROP HARBOR TO WILMETTE HARBOR IL 5NM
OFFSHORE TO MID LAKE
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
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 (<2%)
|
Wind
Probability of 10 or more severe wind events
|
Mod (40%)
|
Probability of 1 or more wind events > 65 knots
|
Mod (30%)
|
Hail
Probability of 10 or more severe hail events
|
Mod (30%)
|
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 (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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