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 658
NWS Storm Prediction Center Norman OK
510 PM CDT Tue Aug 27 2024
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Northern Illinois
Northwest Indiana
Far Southeast Wisconsin
Lake Michigan
* Effective this Tuesday afternoon and evening from 510 PM until
1100 PM CDT.
* Primary threats include...
Scattered damaging winds and isolated significant gusts to 75
mph possible
Scattered large hail and isolated very large hail events to 2
inches in diameter possible
SUMMARY...Thunderstorms should continue to grow in coverage and
intensity this afternoon and evening as they move
east-southeastward. Large hail around 1-2 inches in diameter will be
a threat with any supercells, but severe/damaging winds generally
around 60-70 mph may also occur if thunderstorms can grow into a
small cluster.
The severe thunderstorm watch area is approximately along and 45
statute miles east and west of a line from 15 miles west of Racine
WI to 55 miles southeast of Marseilles IL. 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.
&&
OTHER WATCH INFORMATION...CONTINUE...WW 656...WW 657...
AVIATION...A few severe thunderstorms with hail surface and aloft to
2 inches. Extreme turbulence and surface wind gusts to 65 knots. A
few cumulonimbi with maximum tops to 500. Mean storm motion vector
30025.
...Gleason
SEL8
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 658
NWS Storm Prediction Center Norman OK
510 PM CDT Tue Aug 27 2024
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Northern Illinois
Northwest Indiana
Far Southeast Wisconsin
Lake Michigan
* Effective this Tuesday afternoon and evening from 510 PM until
1100 PM CDT.
* Primary threats include...
Scattered damaging winds and isolated significant gusts to 75
mph possible
Scattered large hail and isolated very large hail events to 2
inches in diameter possible
SUMMARY...Thunderstorms should continue to grow in coverage and
intensity this afternoon and evening as they move
east-southeastward. Large hail around 1-2 inches in diameter will be
a threat with any supercells, but severe/damaging winds generally
around 60-70 mph may also occur if thunderstorms can grow into a
small cluster.
The severe thunderstorm watch area is approximately along and 45
statute miles east and west of a line from 15 miles west of Racine
WI to 55 miles southeast of Marseilles IL. 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.
&&
OTHER WATCH INFORMATION...CONTINUE...WW 656...WW 657...
AVIATION...A few severe thunderstorms with hail surface and aloft to
2 inches. Extreme turbulence and surface wind gusts to 65 knots. A
few cumulonimbi with maximum tops to 500. Mean storm motion vector
30025.
...Gleason
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW8
WW 658 SEVERE TSTM IL IN WI LM 272210Z - 280400Z
AXIS..45 STATUTE MILES EAST AND WEST OF LINE..
15W RAC/RACINE WI/ - 55SE MMO/MARSEILLES IL/
..AVIATION COORDS.. 40NM E/W /23SSE BAE - 42WNW BVT/
HAIL SURFACE AND ALOFT..2 INCHES. WIND GUSTS..65 KNOTS.
MAX TOPS TO 500. MEAN STORM MOTION VECTOR 30025.
LAT...LON 42768722 40808708 40808880 42768899
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU8.
Watch 658 Status Report Messages:
STATUS REPORT #4 ON WW 658
VALID 280330Z - 280400Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 30 W MMO TO
5 E VPZ.
WW 658 WILL BE ALLOWED TO EXPIRE AT 280400Z.
FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 2023
..DEAN..08/28/24
ATTN...WFO...LOT...MKX...
&&
STATUS REPORT FOR WS 658
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
ILC053-063-075-091-099-105-197-280400-
IL
. ILLINOIS COUNTIES INCLUDED ARE
FORD GRUNDY IROQUOIS
KANKAKEE LA SALLE LIVINGSTON
WILL
$$
INC007-073-089-111-127-280400-
IN
. INDIANA COUNTIES INCLUDED ARE
BENTON JASPER LAKE
NEWTON PORTER
$$
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.
$$
STATUS REPORT #3 ON WW 658
VALID 280245Z - 280340Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 30 WNW MMO
TO 15 W BEH.
FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 2023
..DEAN..08/28/24
ATTN...WFO...LOT...MKX...
&&
STATUS REPORT FOR WS 658
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
ILC053-063-075-091-093-099-105-197-280340-
IL
. ILLINOIS COUNTIES INCLUDED ARE
FORD GRUNDY IROQUOIS
KANKAKEE KENDALL LA SALLE
LIVINGSTON WILL
$$
INC007-073-089-111-127-280340-
IN
. INDIANA COUNTIES INCLUDED ARE
BENTON JASPER LAKE
NEWTON PORTER
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #2 ON WW 658
VALID 280015Z - 280140Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 5 WSW JVL TO
40 NW BEH.
FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 2020
..DEAN..08/28/24
ATTN...WFO...LOT...MKX...
&&
STATUS REPORT FOR WS 658
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
ILC007-031-037-043-053-063-075-089-091-093-097-099-103-105-111-
141-197-201-280140-
IL
. ILLINOIS COUNTIES INCLUDED ARE
BOONE COOK DE KALB
DUPAGE FORD GRUNDY
IROQUOIS KANE KANKAKEE
KENDALL LAKE LA SALLE
LEE LIVINGSTON MCHENRY
OGLE WILL WINNEBAGO
$$
INC007-073-089-111-127-280140-
IN
. INDIANA COUNTIES INCLUDED ARE
BENTON JASPER LAKE
NEWTON PORTER
$$
LMZ740-741-742-743-744-745-777-779-280140-
CW
. ADJACENT COASTAL WATERS INCLUDED ARE
WINTHROP HARBOR TO WILMETTE HARBOR IL
WILMETTE HARBOR TO NORTHERLY ISLAND IL
NORTHERLY ISLAND TO CALUMET HARBOR IL
CALUMET HARBOR IL TO GARY IN
GARY TO BURNS HARBOR IN
BURNS HARBOR TO MICHIGAN CITY IN
LAKE MICHIGAN FROM WINTHROP HARBOR TO WILMETTE HARBOR IL 5NM
OFFSHORE TO MID LAKE
LAKE MICHIGAN FROM WILMETTE HARBOR TO MICHIGAN CITY IN 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 658
VALID 272240Z - 272340Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
..DEAN..08/27/24
ATTN...WFO...LOT...MKX...
&&
STATUS REPORT FOR WS 658
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
ILC007-031-037-043-053-063-075-089-091-093-097-099-103-105-111-
141-197-201-272340-
IL
. ILLINOIS COUNTIES INCLUDED ARE
BOONE COOK DE KALB
DUPAGE FORD GRUNDY
IROQUOIS KANE KANKAKEE
KENDALL LAKE LA SALLE
LEE LIVINGSTON MCHENRY
OGLE WILL WINNEBAGO
$$
INC007-073-089-111-127-272340-
IN
. INDIANA COUNTIES INCLUDED ARE
BENTON JASPER LAKE
NEWTON PORTER
$$
WIC059-101-127-272340-
WI
. WISCONSIN COUNTIES INCLUDED ARE
KENOSHA RACINE WALWORTH
$$
LMZ646-675-740-741-742-743-744-745-777-779-272340-
CW
. ADJACENT COASTAL WATERS INCLUDED ARE
WIND POINT WI TO WINTHROP HARBOR IL
LAKE MICHIGAN FROM WIND POINT WI TO WINTHROP HARBOR IL 5NM
OFFSHORE TO MID LAKE
WINTHROP HARBOR TO WILMETTE HARBOR IL
WILMETTE HARBOR TO NORTHERLY ISLAND IL
NORTHERLY ISLAND TO CALUMET HARBOR IL
CALUMET HARBOR IL TO GARY IN
GARY TO BURNS HARBOR IN
BURNS HARBOR TO MICHIGAN CITY IN
LAKE MICHIGAN FROM WINTHROP HARBOR TO WILMETTE HARBOR IL 5NM
OFFSHORE TO MID LAKE
LAKE MICHIGAN FROM WILMETTE HARBOR TO MICHIGAN CITY IN 5NM
OFFSHORE TO MID LAKE
$$
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 (10%)
|
Probability of 1 or more strong (EF2-EF5) tornadoes
|
Low (5%)
|
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 (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 (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.
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