Tornado Watch 172

Issued

Jun 11, 2018, 3:42 PM CDT (20:42 UTC)

Expired

Jun 11, 2018, 9:35 PM CDT

In force

6 hr

Issued by

the Storm Prediction Center

Largest hail expected

3 in

Strongest gust expected

65 kt

The Omaha radar (KOAX), 127 km from the middle of the area, began a volume at 20:43 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

60%

One or more EF2 to EF5 tornadoes

40%

Ten or more severe wind reports

60%

One or more gusts of 65 knots or more

50%

Ten or more severe hail reports

70%

One or more hailstones of 2 inches or more

70%

Six or more combined severe hail and wind reports

95%

• Mesoscale Discussion 706Jun 11, 2:38 PM CDT

946 
WWUS20 KWNS 112039
SEL2  
SPC WW 112039
IAZ000-MNZ000-MOZ000-NEZ000-SDZ000-120400-

URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 172
NWS Storm Prediction Center Norman OK
340 PM CDT Mon Jun 11 2018

The NWS Storm Prediction Center has issued a

* Tornado Watch for portions of 
  Western Iowa
  Far southwest Minnesota
  Far northwest Missouri
  Eastern Nebraska
  Far southeast South Dakota

* Effective this Monday afternoon and evening from 340 PM until
  1100 PM CDT.

* Primary threats include...
  A few tornadoes likely with a couple intense tornadoes possible
  Scattered large hail and isolated very large hail events to 3
    inches in diameter likely
  Scattered damaging winds likely with isolated significant gusts
    to 75 mph possible

SUMMARY...Scattered storms will develop along a slow-moving cold
front. Environment is favorable for intense storms capable of
producing all hazards. With time, storms should evolve into line
segments which may result in an increasing wind threat towards
sunset.

The tornado watch area is approximately along and 70 statute miles
east and west of a line from 35 miles north northwest of Spencer IA
to 25 miles west of Falls City NE. For a complete depiction of the
watch see the associated watch outline update (WOUS64 KWNS WOU2).

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 65 knots. A few cumulonimbi with maximum tops to 550. Mean
storm motion vector 31020.

...Grams

Tornado Watches in Iowa, 2018Tornado Watches in Nebraska, 2018Tornado Watches in Missouri, 2018Every tornado watch in 2018

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.