MIL-OSI USA: SPC Severe Thunderstorm Watch 274

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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.
SEL4

URGENT – IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 274
NWS Storm Prediction Center Norman OK
505 PM CDT Thu Jul 12 2018

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of
Northwest Iowa
Southern Minnesota
Western Wisconsin

* Effective this Thursday afternoon from 505 PM until Midnight
CDT.

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

SUMMARY…Thunderstorms are developing along a cold front extending
across south-central MN into western WI. A few of these storms will
pose a risk of locally damaging wind gusts and hail through the
evening.

The severe thunderstorm watch area is approximately along and 50
statute miles north and south of a line from 50 miles west of
Worthington MN to 50 miles east northeast of Eau Claire WI. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU4).

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 273…

AVIATION…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
28025.

…Hart

Note: The Aviation Watch (SAW) product is an approximation to the watch area. The actual watch is depicted by the shaded areas.
SAW4
WW 274 SEVERE TSTM IA MN WI 122205Z – 130500Z
AXIS..50 STATUTE MILES NORTH AND SOUTH OF LINE..
50W OTG/WORTHINGTON MN/ – 50ENE EAU/EAU CLAIRE WI/
..AVIATION COORDS.. 45NM N/S /9E FSD – 43ENE EAU/
HAIL SURFACE AND ALOFT..2 INCHES. WIND GUSTS..60 KNOTS.
MAX TOPS TO 500. MEAN STORM MOTION VECTOR 28025.

LAT…LON 44369658 45869052 44419052 42919658

THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU4.

Watch 274 Status Report Message has not been issued yet.

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

Low ( 2 inches

Mod (30%)

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% (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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