Tornado Watch 240

Issued

May 18, 2017, 6:02 PM CDT (23:02 UTC)

Expired

May 19, 2017, 1:00 AM CDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

2.5 in

Strongest gust expected

60 kt

The Tulsa radar (KINX), 71 km from the middle of the area, began a volume at 23:01 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

20%

Ten or more severe wind reports

40%

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

50%

Six or more combined severe hail and wind reports

80%

• Mesoscale Discussion 766May 18, 5:47 PM CDT
• Mesoscale Discussion 770May 18, 7:43 PM CDT
• Mesoscale Discussion 772May 18, 9:41 PM CDT

915 
WWUS20 KWNS 182259
SEL0  
SPC WW 182259
OKZ000-190500-

URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 240
NWS Storm Prediction Center Norman OK
600 PM CDT Thu May 18 2017

The NWS Storm Prediction Center has issued a

* Tornado Watch for portions of 
  East-central Oklahoma

* Effective this Thursday night from 600 PM until Midnight CDT.

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

SUMMARY...Severe thunderstorms over central Oklahoma will track
northeastward across the watch area this evening, posing a risk of
large hail and isolated tornadoes.

The tornado watch area is approximately along and 45 statute miles
east and west of a line from 20 miles north northeast of
Bartlesville OK to 40 miles east southeast of Ardmore OK. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU0).

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.

&&

OTHER WATCH INFORMATION...CONTINUE...WW 235...WW 236...WW
237...WW 238...WW 239...

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 24030.

...Hart

Tornado Watches in Oklahoma, 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.