Tornado Watch 148

Issued

Apr 19, 2017, 3:23 PM CDT (20:23 UTC)

Expired

Apr 19, 2017, 10:00 PM CDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

2.5 in

Strongest gust expected

60 kt

The Omaha radar (KOAX), 32 km from the middle of the area, began a volume at 20:21 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

20%

Ten or more severe wind reports

30%

One or more gusts of 65 knots or more

10%

Ten or more severe hail reports

60%

One or more hailstones of 2 inches or more

60%

Six or more combined severe hail and wind reports

90%

• Mesoscale Discussion 519Apr 19, 2:29 PM CDT
• Mesoscale Discussion 520Apr 19, 5:30 PM CDT
• Mesoscale Discussion 521Apr 19, 6:55 PM CDT
• Mesoscale Discussion 522Apr 19, 7:01 PM CDT

441 
WWUS20 KWNS 192021
SEL8  
SPC WW 192021
IAZ000-MOZ000-NEZ000-200300-

URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 148
NWS Storm Prediction Center Norman OK
320 PM CDT Wed Apr 19 2017

The NWS Storm Prediction Center has issued a

* Tornado Watch for portions of 
  Southwest Iowa
  Northwest Missouri
  East central and southeast Nebraska

* Effective this Wednesday afternoon and evening from 320 PM
  until 1000 PM CDT.

* Primary threats include...
  A few tornadoes likely
  Scattered large hail and isolated very large hail events to 2.5
    inches in diameter likely
  Isolated damaging wind gusts to 70 mph possible

SUMMARY...Severe storms are expected to develop in the next 1-2
hours across southeast Nebraska, and then storms will spread
eastward into Iowa and extreme northwest Missouri through this
evening.  The storm environment will favor semi-discrete supercells
capable of producing isolated very large hail and a few tornadoes,
as well as isolated damaging gusts.

The tornado watch area is approximately along and 60 statute miles
east and west of a line from 40 miles north northeast of Omaha NE to
30 miles southeast of Beatrice NE. For a complete depiction of the
watch see the associated watch outline update (WOUS64 KWNS WOU8).

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 2.5 inches. Extreme turbulence and surface wind
gusts to 60 knots. A few cumulonimbi with maximum tops to 500. Mean
storm motion vector 26030.

...Thompson

Tornado Watches in Nebraska, 2017Tornado Watches in Iowa, 2017Tornado Watches in Missouri, 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.