MIL-OSI USA: SPC Tornado Watch 271

By   /  July 12, 2018  /  Comments Off on MIL-OSI USA: SPC Tornado Watch 271

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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
Tornado Watch Number 271
NWS Storm Prediction Center Norman OK
640 PM CDT Wed Jul 11 2018

The NWS Storm Prediction Center has issued a

* Tornado Watch for portions of
Northern Minnesota
Southeast North Dakota

* Effective this Wednesday night and Thursday morning from 640 PM
until 100 AM CDT.

* Primary threats include…
A couple tornadoes possible
Scattered damaging wind gusts to 70 mph likely
Scattered large hail and isolated very large hail events to 2
inches in diameter possible

SUMMARY…Thunderstorms are expected to develop along a cold front
over northwest MN and spread eastward across the watch through the
evening. Damaging winds and hail are the main threats, but some
tornado potential also exists for a few hours this evening.

The tornado watch area is approximately along and 80 statute miles
east and west of a line from 60 miles west northwest of
International Falls MN to 55 miles south southeast of Detroit Lakes
MN. For a complete depiction of the watch see the associated watch
outline update (WOUS64 KWNS WOU1).

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.

&&

AVIATION…Tornadoes and a few severe thunderstorms with hail
surface and aloft to 2 inches. Extreme turbulence and surface wind
gusts to 60 knots. A few cumulonimbi with maximum tops to 500. Mean
storm motion vector 27035.

…Hart

SEL1

URGENT – IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 271
NWS Storm Prediction Center Norman OK
640 PM CDT Wed Jul 11 2018

The NWS Storm Prediction Center has issued a

* Tornado Watch for portions of
Northern Minnesota
Southeast North Dakota

* Effective this Wednesday night and Thursday morning from 640 PM
until 100 AM CDT.

* Primary threats include…
A couple tornadoes possible
Scattered damaging wind gusts to 70 mph likely
Scattered large hail and isolated very large hail events to 2
inches in diameter possible

SUMMARY…Thunderstorms are expected to develop along a cold front
over northwest MN and spread eastward across the watch through the
evening. Damaging winds and hail are the main threats, but some
tornado potential also exists for a few hours this evening.

The tornado watch area is approximately along and 80 statute miles
east and west of a line from 60 miles west northwest of
International Falls MN to 55 miles south southeast of Detroit Lakes
MN. For a complete depiction of the watch see the associated watch
outline update (WOUS64 KWNS WOU1).

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.

&&

AVIATION…Tornadoes and a few severe thunderstorms with hail
surface and aloft to 2 inches. Extreme turbulence and surface wind
gusts to 60 knots. A few cumulonimbi with maximum tops to 500. Mean
storm motion vector 27035.

…Hart

Note: The Aviation Watch (SAW) product is an approximation to the watch area. The actual watch is depicted by the shaded areas.
SAW1
WW 271 TORNADO MN ND 112340Z – 120600Z
AXIS..80 STATUTE MILES EAST AND WEST OF LINE..
60WNW INL/INTERNATIONAL FALLS MN/ – 55SSE DTL/DETROIT LAKES MN/
..AVIATION COORDS.. 70NM E/W /52WNW INL – 61WSW BRD/
HAIL SURFACE AND ALOFT..2 INCHES. WIND GUSTS..60 KNOTS.
MAX TOPS TO 500. MEAN STORM MOTION VECTOR 27035.

LAT…LON 48889286 46089376 46089711 48889637

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

Watch 271 Status Report Message has not been issued yet.

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

Mod (40%)

Probability of 1 or more strong (F2-F5) tornadoes

Low (10%)

WindProbability of 10 or more severe wind events

High (70%)

Probability of 1 or more wind events > 65 knots

Low (20%)

HailProbability of 10 or more severe hail events

Mod (50%)

Probability of 1 or more hailstones > 2 inches

Mod (50%)

Combined Severe Hail/WindProbability of 6 or more combined severe hail/wind events

High (>95%)

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% (F2-F5 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.

MIL OSI USA News

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