Tornado Watch 368

Issued

Sep 4, 2018, 3:35 PM CDT (20:35 UTC)

Expired

Sep 4, 2018, 11:00 PM CDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

1.5 in

Strongest gust expected

60 kt

The La Crosse radar (KARX), 131 km from the middle of the area, began a volume at 20:36 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

10%

Ten or more severe hail reports

5%

One or more hailstones of 2 inches or more

5%

Six or more combined severe hail and wind reports

50%

• Mesoscale Discussion 1424Sep 4, 2:06 PM CDT
• Mesoscale Discussion 1426Sep 4, 6:28 PM CDT
• Mesoscale Discussion 1427Sep 4, 9:07 PM CDT

551 
WWUS20 KWNS 042032
SEL8  
SPC WW 042032
IAZ000-MNZ000-WIZ000-050300-

URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 368
NWS Storm Prediction Center Norman OK
335 PM CDT Tue Sep 4 2018

The NWS Storm Prediction Center has issued a

* Tornado Watch for portions of 
  Northern and central Iowa
  Southeast Minnesota
  Western and central Wisconsin

* Effective this Tuesday afternoon and evening from 335 PM until
  1000 PM CDT.

* Primary threats include...
  A couple tornadoes possible
  Isolated damaging wind gusts to 70 mph possible

SUMMARY...A gradual strengthening of low-level winds in conjunction
with a very moist air mass will support the possibility of
high-precipitation supercells as well as organized small-scale
bowing segments. A couple of tornadoes will be possible aside from
wind damage through the mid-evening hours.

The tornado watch area is approximately along and 60 statute miles
north and south of a line from 30 miles west southwest of Fort Dodge
IA to 60 miles north northeast of Camp Douglas WI. 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 1.5 inches. Extreme turbulence and surface wind
gusts to 60 knots. A few cumulonimbi with maximum tops to 500. Mean
storm motion vector 22030.

...Guyer

Tornado Watches in Iowa, 2018Tornado Watches in Wisconsin, 2018Tornado Watches in Minnesota, 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.