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Source: US National Oceanic and Atmospheric Administration

Note:  The expiration time in the watch graphic is amended if the watch is replaced, cancelled or extended.Note: Click for Watch Status Reports.
SEL1

URGENT – IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 651
NWS Storm Prediction Center Norman OK
635 PM CDT Thu Sep 12 2019

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of
northern Illinois
southern Wisconsin
Lake Michigan

* Effective this Thursday night and Friday morning from 635 PM
until 200 AM CDT.

* Primary threats include…
Scattered damaging wind gusts to 70 mph possible
Scattered large hail events to 1.5 inches in diameter possible
A tornado or two possible

SUMMARY…Thunderstorms ongoing near and west of the Mississippi
River are expected to increase in coverage, while spreading eastward
across southern Wisconsin and northern Illinois over the next
several hours. Damaging winds will be the primary severe threat
accompanying the stronger storms, though hail will also be possible
locally. In addition, a tornado or two may also occur —
particularly within a few counties either side of the
Wisconsin/Illinois border area.

The severe thunderstorm watch area is approximately along and 65
statute miles east and west of a line from 35 miles north northeast
of Madison WI to 60 miles southwest of Marseilles IL. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU1).

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 648…WW 649…WW 650…

AVIATION…A few severe thunderstorms with hail surface and aloft to
1.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 550. Mean storm motion vector
23030.

…Goss

SEL1

URGENT – IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 651
NWS Storm Prediction Center Norman OK
635 PM CDT Thu Sep 12 2019

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of
northern Illinois
southern Wisconsin
Lake Michigan

* Effective this Thursday night and Friday morning from 635 PM
until 200 AM CDT.

* Primary threats include…
Scattered damaging wind gusts to 70 mph possible
Scattered large hail events to 1.5 inches in diameter possible
A tornado or two possible

SUMMARY…Thunderstorms ongoing near and west of the Mississippi
River are expected to increase in coverage, while spreading eastward
across southern Wisconsin and northern Illinois over the next
several hours. Damaging winds will be the primary severe threat
accompanying the stronger storms, though hail will also be possible
locally. In addition, a tornado or two may also occur —
particularly within a few counties either side of the
Wisconsin/Illinois border area.

The severe thunderstorm watch area is approximately along and 65
statute miles east and west of a line from 35 miles north northeast
of Madison WI to 60 miles southwest of Marseilles IL. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU1).

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 648…WW 649…WW 650…

AVIATION…A few severe thunderstorms with hail surface and aloft to
1.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 550. Mean storm motion vector
23030.

…Goss

Note: The Aviation Watch (SAW) product is an approximation to the watch area. The actual watch is depicted by the shaded areas.
SAW1
WW 651 SEVERE TSTM IL WI LM 122335Z – 130700Z
AXIS..65 STATUTE MILES EAST AND WEST OF LINE..
35NNE MSN/MADISON WI/ – 60SW MMO/MARSEILLES IL/
..AVIATION COORDS.. 55NM E/W /30E DLL – 25S BDF/
HAIL SURFACE AND ALOFT..1.5 INCHES. WIND GUSTS..60 KNOTS.
MAX TOPS TO 550. MEAN STORM MOTION VECTOR 23030.

LAT…LON 43598776 40758825 40759073 43599036

THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU1.

Watch 651 Status Report Message has not been issued yet.

Note:  Click for Complete Product Text.TornadoesProbability of 2 or more tornadoes

Low (20%)

Probability of 1 or more strong (EF2-EF5) tornadoes

Low (5%)

WindProbability of 10 or more severe wind events

Mod (40%)

Probability of 1 or more wind events > 65 knots

Low (20%)

HailProbability of 10 or more severe hail events

Mod (40%)

Probability of 1 or more hailstones > 2 inches

Low (20%)

Combined Severe Hail/WindProbability 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.

Source: US National Oceanic and Atmospheric Administration

Note:  The expiration time in the watch graphic is amended if the watch is replaced, cancelled or extended.Note: Click for Watch Status Reports.
SEL1

URGENT – IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 651
NWS Storm Prediction Center Norman OK
635 PM CDT Thu Sep 12 2019

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of
northern Illinois
southern Wisconsin
Lake Michigan

* Effective this Thursday night and Friday morning from 635 PM
until 200 AM CDT.

* Primary threats include…
Scattered damaging wind gusts to 70 mph possible
Scattered large hail events to 1.5 inches in diameter possible
A tornado or two possible

SUMMARY…Thunderstorms ongoing near and west of the Mississippi
River are expected to increase in coverage, while spreading eastward
across southern Wisconsin and northern Illinois over the next
several hours. Damaging winds will be the primary severe threat
accompanying the stronger storms, though hail will also be possible
locally. In addition, a tornado or two may also occur —
particularly within a few counties either side of the
Wisconsin/Illinois border area.

The severe thunderstorm watch area is approximately along and 65
statute miles east and west of a line from 35 miles north northeast
of Madison WI to 60 miles southwest of Marseilles IL. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU1).

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 648…WW 649…WW 650…

AVIATION…A few severe thunderstorms with hail surface and aloft to
1.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 550. Mean storm motion vector
23030.

…Goss

SEL1

URGENT – IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 651
NWS Storm Prediction Center Norman OK
635 PM CDT Thu Sep 12 2019

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of
northern Illinois
southern Wisconsin
Lake Michigan

* Effective this Thursday night and Friday morning from 635 PM
until 200 AM CDT.

* Primary threats include…
Scattered damaging wind gusts to 70 mph possible
Scattered large hail events to 1.5 inches in diameter possible
A tornado or two possible

SUMMARY…Thunderstorms ongoing near and west of the Mississippi
River are expected to increase in coverage, while spreading eastward
across southern Wisconsin and northern Illinois over the next
several hours. Damaging winds will be the primary severe threat
accompanying the stronger storms, though hail will also be possible
locally. In addition, a tornado or two may also occur —
particularly within a few counties either side of the
Wisconsin/Illinois border area.

The severe thunderstorm watch area is approximately along and 65
statute miles east and west of a line from 35 miles north northeast
of Madison WI to 60 miles southwest of Marseilles IL. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU1).

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 648…WW 649…WW 650…

AVIATION…A few severe thunderstorms with hail surface and aloft to
1.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 550. Mean storm motion vector
23030.

…Goss

Note: The Aviation Watch (SAW) product is an approximation to the watch area. The actual watch is depicted by the shaded areas.
SAW1
WW 651 SEVERE TSTM IL WI LM 122335Z – 130700Z
AXIS..65 STATUTE MILES EAST AND WEST OF LINE..
35NNE MSN/MADISON WI/ – 60SW MMO/MARSEILLES IL/
..AVIATION COORDS.. 55NM E/W /30E DLL – 25S BDF/
HAIL SURFACE AND ALOFT..1.5 INCHES. WIND GUSTS..60 KNOTS.
MAX TOPS TO 550. MEAN STORM MOTION VECTOR 23030.

LAT…LON 43598776 40758825 40759073 43599036

THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU1.

Watch 651 Status Report Message has not been issued yet.

Note:  Click for Complete Product Text.TornadoesProbability of 2 or more tornadoes

Low (20%)

Probability of 1 or more strong (EF2-EF5) tornadoes

Low (5%)

WindProbability of 10 or more severe wind events

Mod (40%)

Probability of 1 or more wind events > 65 knots

Low (20%)

HailProbability of 10 or more severe hail events

Mod (40%)

Probability of 1 or more hailstones > 2 inches

Low (20%)

Combined Severe Hail/WindProbability 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.

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