Tornado Watch 263

Issued

May 27, 2019, 1:22 PM CDT (18:22 UTC)

Expired

May 27, 2019, 10:19 PM CDT

In force

9 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

The Chicago radar (KLOT), 77 km from the middle of the area, began a volume at 18:21 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

80%

One or more EF2 to EF5 tornadoes

50%

Ten or more severe wind reports

60%

One or more gusts of 65 knots or more

20%

Ten or more severe hail reports

60%

One or more hailstones of 2 inches or more

30%

Six or more combined severe hail and wind reports

95%

• Mesoscale Discussion 831May 27, 12:50 PM CDT
• Mesoscale Discussion 835May 27, 3:57 PM CDT
• Mesoscale Discussion 838May 27, 5:30 PM CDT
• Mesoscale Discussion 840May 27, 8:08 PM CDT

011 
WWUS20 KWNS 271820
SEL3  
SPC WW 271820
IAZ000-ILZ000-INZ000-MIZ000-LMZ000-280200-

URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 263
NWS Storm Prediction Center Norman OK
125 PM CDT Mon May 27 2019

The NWS Storm Prediction Center has issued a

* Tornado Watch for portions of 
  Extreme eastern Iowa
  Parts of northern and central Illinois
  Parts of northern and central Indiana
  Extreme southwest Lower Michigan
  Lake Michigan

* Effective this Monday afternoon and evening from 125 PM until
  900 PM CDT.

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

SUMMARY...Scattered supercell development is expected from near the
Mississippi River eastward across northern Illinois this afternoon,
in an environment that is becoming more favorable for tornadoes,
some of which could be strong.  The severe threat will spread
eastward into Indiana later this afternoon into this evening.

The tornado watch area is approximately along and 60 statute miles
north and south of a line from 20 miles north of Burlington IA to 55
miles southeast of South Bend IN. For a complete depiction of the
watch see the associated watch outline update (WOUS64 KWNS WOU3).

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 27030.

...Thompson

Tornado Watches in Indiana, 2019Tornado Watches in Illinois, 2019Tornado Watches in Iowa, 2019Every tornado watch in 2019

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.