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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.
SEL8

URGENT – IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 638
NWS Storm Prediction Center Norman OK
255 PM MDT Sun Sep 8 2019

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of
Central and Northeastern Colorado

* Effective this Sunday afternoon and evening from 255 PM until
900 PM MDT.

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

SUMMARY…Thunderstorms over the high terrain of central Colorado
will intensify as it moves eastward into the High Plains. Damaging
wind gusts are the main concern with the strongest cells, along with
some risk of hail.

The severe thunderstorm watch area is approximately along and 75
statute miles east and west of a line from 40 miles north northwest
of Fort Collins CO to 15 miles southeast of Pueblo CO. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU8).

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.

&&

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 500. Mean storm motion vector
26030.

…Hart

SEL8

URGENT – IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 638
NWS Storm Prediction Center Norman OK
255 PM MDT Sun Sep 8 2019

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of
Central and Northeastern Colorado

* Effective this Sunday afternoon and evening from 255 PM until
900 PM MDT.

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

SUMMARY…Thunderstorms over the high terrain of central Colorado
will intensify as it moves eastward into the High Plains. Damaging
wind gusts are the main concern with the strongest cells, along with
some risk of hail.

The severe thunderstorm watch area is approximately along and 75
statute miles east and west of a line from 40 miles north northwest
of Fort Collins CO to 15 miles southeast of Pueblo CO. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU8).

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.

&&

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 500. Mean storm motion vector
26030.

…Hart

Note: The Aviation Watch (SAW) product is an approximation to the watch area. The actual watch is depicted by the shaded areas.
SAW8
WW 638 SEVERE TSTM CO 082055Z – 090300Z
AXIS..75 STATUTE MILES EAST AND WEST OF LINE..
40NNW FCL/FORT COLLINS CO/ – 15SE PUB/PUEBLO CO/
..AVIATION COORDS.. 65NM E/W /28SE LAR – 11SSE PUB/
HAIL SURFACE AND ALOFT..1.5 INCHES. WIND GUSTS..60 KNOTS.
MAX TOPS TO 500. MEAN STORM MOTION VECTOR 26030.

LAT…LON 40970387 38110293 38110568 40970675

THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU8.

Watch 638 Status Report Message has not been issued yet.

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

Low (10%)

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

Low ( 65 knots

Low (20%)

HailProbability of 10 or more severe hail events

Low (20%)

Probability of 1 or more hailstones > 2 inches

Low (10%)

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

Mod (60%)

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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