Tornado Watch 61

Issued

Mar 6, 2017, 1:54 PM CST (19:54 UTC)

Expired

Mar 6, 2017, 10:00 PM CST

In force

8 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

The Des Moines radar (KDMX), 70 km from the middle of the area, began a volume at 19:54 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

50%

One or more EF2 to EF5 tornadoes

30%

Ten or more severe wind reports

60%

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 252Mar 6, 1:08 PM CST
• Mesoscale Discussion 256Mar 6, 3:35 PM CST
• Mesoscale Discussion 259Mar 6, 6:11 PM CST
• Mesoscale Discussion 263Mar 6, 7:42 PM CST

849 
WWUS20 KWNS 061953
SEL1  
SPC WW 061953
IAZ000-070400-

URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 61
NWS Storm Prediction Center Norman OK
155 PM CST Mon Mar 6 2017

The NWS Storm Prediction Center has issued a

* Tornado Watch for portions of 
  Much of Iowa

* Effective this Monday afternoon and evening from 155 PM until
  1000 PM CST.

* Primary threats include...
  A few tornadoes and a couple intense tornadoes possible
  Scattered damaging wind gusts to 70 mph likely
  Scattered large hail and isolated very large hail events to 2
    inches in diameter possible

SUMMARY...Clusters of thunderstorms will rapidly progress
east-northeast from the Missouri towards the Mississippi river
during the evening. This activity will likely form into an extensive
line of storms with all severe hazards possible, but damaging winds
as the main risk.

The tornado watch area is approximately along and 90 statute miles
east and west of a line from 25 miles north of Mason City IA to 50
miles south southwest of Knoxville IA. For a complete depiction of
the watch see the associated watch outline update (WOUS64 KWNS
WOU1).

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 inches. Extreme turbulence and surface wind
gusts to 60 knots. A few cumulonimbi with maximum tops to 500. Mean
storm motion vector 24045.

...Grams

Tornado Watches in Iowa, 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.