MIL-OSI USA: SPC Severe Thunderstorm Watch 297

3

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.
SEL7

URGENT – IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 297
NWS Storm Prediction Center Norman OK
940 PM CDT Sun Jun 20 2021

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of
Northeast Illinois
Northwest Indiana
Lake Michigan

* Effective this Sunday night and Monday morning from 940 PM
until 200 AM CDT.

* Primary threats include…
Scattered damaging wind gusts to 65 mph possible
Isolated large hail events to 1.5 inches in diameter possible
A tornado or two possible

SUMMARY…Clusters of storms will continue to move eastward across
northern Illinois toward the Chicagoland area and southern Lake
Michigan and eventually northwest Indiana. Damaging winds are the
most likely concern, but some severe hail is also possible and a
tornado cannot be ruled out.

The severe thunderstorm watch area is approximately along and 45
statute miles east and west of a line from 80 miles north northwest
of Valparaiso IN to 65 miles southwest of Valparaiso IN. 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.

&&

OTHER WATCH INFORMATION…CONTINUE…WW 294…WW 295…WW 296…

AVIATION…A few severe thunderstorms with hail surface and aloft to
1.5 inches. Extreme turbulence and surface wind gusts to 55 knots. A
few cumulonimbi with maximum tops to 550. Mean storm motion vector
29030.

…Guyer

SEL7

URGENT – IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 297
NWS Storm Prediction Center Norman OK
940 PM CDT Sun Jun 20 2021

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of
Northeast Illinois
Northwest Indiana
Lake Michigan

* Effective this Sunday night and Monday morning from 940 PM
until 200 AM CDT.

* Primary threats include…
Scattered damaging wind gusts to 65 mph possible
Isolated large hail events to 1.5 inches in diameter possible
A tornado or two possible

SUMMARY…Clusters of storms will continue to move eastward across
northern Illinois toward the Chicagoland area and southern Lake
Michigan and eventually northwest Indiana. Damaging winds are the
most likely concern, but some severe hail is also possible and a
tornado cannot be ruled out.

The severe thunderstorm watch area is approximately along and 45
statute miles east and west of a line from 80 miles north northwest
of Valparaiso IN to 65 miles southwest of Valparaiso IN. 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.

&&

OTHER WATCH INFORMATION…CONTINUE…WW 294…WW 295…WW 296…

AVIATION…A few severe thunderstorms with hail surface and aloft to
1.5 inches. Extreme turbulence and surface wind gusts to 55 knots. A
few cumulonimbi with maximum tops to 550. Mean storm motion vector
29030.

…Guyer

Note: The Aviation Watch (SAW) product is an approximation to the watch area. The actual watch is depicted by the shaded areas.
SAW7
WW 297 SEVERE TSTM IL IN LM 210240Z – 210700Z
AXIS..45 STATUTE MILES EAST AND WEST OF LINE..
80NNW VPZ/VALPARAISO IN/ – 65SW VPZ/VALPARAISO IN/
..AVIATION COORDS.. 40NM E/W /35NNE ORD – 39WNW BVT/
HAIL SURFACE AND ALOFT..1.5 INCHES. WIND GUSTS..55 KNOTS.
MAX TOPS TO 550. MEAN STORM MOTION VECTOR 29030.

LAT…LON 42518672 40788702 40788874 42518848

THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU7.

Watch 297 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 (50%)

Probability of 1 or more wind events > 65 knots

Low (10%)

HailProbability of 10 or more severe hail events

Low (20%)

Probability of 1 or more hailstones > 2 inches

Low (

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