MIL-OSI USA: SPC Tornado Watch 520

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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.
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URGENT – IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 520
NWS Storm Prediction Center Norman OK
1100 PM CDT Sun Oct 10 2021

The NWS Storm Prediction Center has issued a

* Tornado Watch for portions of
Western Arkansas
Northwest Louisiana
Southeast Oklahoma
Northeast Texas

* Effective this Sunday night and Monday morning from 1100 PM
until 400 AM CDT.

* Primary threats include…
A few tornadoes possible
Scattered damaging winds likely with isolated significant gusts
to 75 mph possible
Isolated large hail events to 1.5 inches in diameter possible

SUMMARY…Line of storms with embedded bowing segments and
mesovortices will continue east through northeast TX and into the
Arklatex region tonight. Damaging wind and a few tornadoes are the
main threats.

The tornado watch area is approximately along and 65 statute miles
east and west of a line from 55 miles north of De Queen AR to 55
miles south of Longview TX. For a complete depiction of the watch
see the associated watch outline update (WOUS64 KWNS WOU0).

PRECAUTIONARY/PREPAREDNESS ACTIONS…

REMEMBER…A Tornado Watch means conditions are favorable for
tornadoes and 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.

&&

OTHER WATCH INFORMATION…CONTINUE…WW 518…WW 519…

AVIATION…Tornadoes and a few severe thunderstorms with hail
surface and aloft to 1.5 inches. Extreme turbulence and surface wind
gusts to 65 knots. A few cumulonimbi with maximum tops to 500. Mean
storm motion vector 27040.

…Dial

Note: The Aviation Watch (SAW) product is an approximation to the watch area. The actual watch is depicted by the shaded areas.
SAW0
WW 520 TORNADO AR LA OK TX 110400Z – 110900Z
AXIS..65 STATUTE MILES EAST AND WEST OF LINE..
55N DEQ/DE QUEEN AR/ – 55S GGG/LONGVIEW TX/
..AVIATION COORDS.. 55NM E/W /33SSW FSM – 25N LFK/
HAIL SURFACE AND ALOFT..1.5 INCHES. WIND GUSTS..65 KNOTS.
MAX TOPS TO 500. MEAN STORM MOTION VECTOR 27040.

LAT…LON 34849325 31589362 31589582 34849555

THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU0.

Watch 520 Status Report Message has not been issued yet.

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

Mod (50%)

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

Low (20%)

WindProbability of 10 or more severe wind events

Mod (60%)

Probability of 1 or more wind events > 65 knots

Mod (30%)

HailProbability of 10 or more severe hail events

Mod (30%)

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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