Severe Thunderstorm Watch 521

Issued

Jul 27, 2026, 1:39 PM CDT (18:39 UTC)

Expired

Jul 27, 2026, 10:00 PM CDT

In force

8 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

70 kt

The Indianapolis radar (KIND), 21 km from the middle of the area, began a volume at 18:39 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

20%

One or more EF2 to EF5 tornadoes

2%

Ten or more severe wind reports

90%

One or more gusts of 65 knots or more

60%

Ten or more severe hail reports

30%

One or more hailstones of 2 inches or more

30%

Six or more combined severe hail and wind reports

95%

• Mesoscale Discussion 1764 Severe potential...watch likelyJul 27, 1:08 PM CDT
• Mesoscale Discussion 1770 Severe potential...watch possibleJul 27, 3:48 PM CDT
• Mesoscale Discussion 1775 Severe thunderstorm watch 521Jul 27, 7:09 PM CDT

870 
WWUS20 KWNS 271837
SEL1  
SPC WW 271837
ILZ000-INZ000-280100-

URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 521
NWS Storm Prediction Center Norman OK
240 PM EDT Mon Jul 27 2026

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of 
  East Central Illinois
  Central Indiana

* Effective this Monday afternoon and evening from 240 PM until
  900 PM EDT.

* Primary threats include...
  Widespread damaging winds and isolated significant gusts to 80
    mph likely
  Isolated very large hail events to 2 inches in diameter possible
  A tornado or two possible

SUMMARY...An intensifying cluster of thunderstorms over northwest
Indiana will track southward this afternoon through a very moist and
unstable air mass.  Severe wind gusts are expected along the leading
edge of the storms, along with some risk of large hail and a tornado
or two.

The severe thunderstorm watch area is approximately along and 70
statute miles east and west of a line from 15 miles north northeast
of Lafayette IN to 35 miles south of Bloomington IN. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU1).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER...A Severe Thunderstorm Watch means conditions are
favorable for 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. Severe thunderstorms can and occasionally do produce
tornadoes.

&&

OTHER WATCH INFORMATION...CONTINUE...WW 519...WW 520...

AVIATION...A few severe thunderstorms with hail surface and aloft to
2 inches. Extreme turbulence and surface wind gusts to 70 knots. A
few cumulonimbi with maximum tops to 550. Mean storm motion vector
31035.

...Hart

Severe Thunderstorm Watches in Indiana, 2026Severe Thunderstorm Watches in Illinois, 2026Every severe thunderstorm watch in 2026

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.