Tornado Watch 490

Issued

Oct 1, 2017, 2:25 PM MDT (20:25 UTC)

Expired

Oct 1, 2017, 10:00 PM MDT

In force

8 hr

Issued by

the Storm Prediction Center

Largest hail expected

3 in

Strongest gust expected

60 kt

The Goodland radar (KGLD), 131 km from the middle of the area, began a volume at 20:27 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

Two or more tornadoes

40%

One or more EF2 to EF5 tornadoes

20%

Ten or more severe wind reports

30%

One or more gusts of 65 knots or more

20%

Ten or more severe hail reports

40%

One or more hailstones of 2 inches or more

30%

Six or more combined severe hail and wind reports

80%

• Mesoscale Discussion 1678Oct 1, 1:39 PM MDT
• Mesoscale Discussion 1680 Tornado watch 490Oct 1, 5:40 PM MDT
• Mesoscale Discussion 1681Oct 1, 7:14 PM MDT
• Mesoscale Discussion 1682 Severe thunderstorm watch 491Oct 1, 9:54 PM MDT

853 
WWUS20 KWNS 012023
SEL0  
SPC WW 012023
COZ000-KSZ000-NEZ000-020400-

URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 490
NWS Storm Prediction Center Norman OK
325 PM CDT Sun Oct 1 2017

The NWS Storm Prediction Center has issued a

* Tornado Watch for portions of 
  Far eastern Colorado
  Western Kansas
  Southwest and west-central Nebraska

* Effective this Sunday afternoon and evening from 325 PM until
  1100 PM CDT.

* Primary threats include...
  A couple tornadoes possible
  Scattered large hail and isolated very large hail events to 3
    inches in diameter possible
  Isolated damaging wind gusts to 70 mph possible

SUMMARY...Storms are likely to increase and intensify across the
Colorado, Kansas, and Nebraska border region through late afternoon,
with additional development also expected a bit farther south across
west-central/northwest Kansas. Supercell thunderstorms capable of
large hail are expected through early evening along with the
possibility of a couple of tornadoes. Damaging winds may also become
an increasing concern this evening as storms tend to cluster as they
spread northeastward into Nebraska and far northern Kansas.

The tornado watch area is approximately along and 70 statute miles
east and west of a line from 40 miles northwest of North Platte NE
to 80 miles southwest of Hill City KS. 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.

&&

AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 3 inches. Extreme turbulence and surface wind
gusts to 60 knots. A few cumulonimbi with maximum tops to 450. Mean
storm motion vector 24025.

...Guyer

Tornado Watches in Kansas, 2017Tornado Watches in Nebraska, 2017Tornado Watches in Colorado, 2017Every tornado watch in 2017

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.