Tornado Watch 504

Issued

Oct 21, 2017, 7:24 PM CDT (00:24 UTC)

Expired

Oct 22, 2017, 1:56 AM CDT

In force

7 hr

Issued by

the Storm Prediction Center

Largest hail expected

2 in

Strongest gust expected

60 kt

The Norman radar (KTLX), 96 km from the middle of the area, began a volume at 00:22 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

30%

One or more EF2 to EF5 tornadoes

20%

Ten or more severe wind reports

50%

One or more gusts of 65 knots or more

20%

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

80%

• Mesoscale Discussion 1724Oct 21, 5:05 PM CDT
• Mesoscale Discussion 1727Oct 21, 6:40 PM CDT
• Mesoscale Discussion 1729Oct 21, 8:34 PM CDT
• Mesoscale Discussion 1731Oct 21, 10:42 PM CDT

902 
WWUS20 KWNS 220021
SEL4  
SPC WW 220021
OKZ000-220700-

URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 504
NWS Storm Prediction Center Norman OK
720 PM CDT Sat Oct 21 2017

The NWS Storm Prediction Center has issued a

* Tornado Watch for portions of 
  Eastern Oklahoma

* Effective this Saturday night and Sunday morning from 720 PM
  until 200 AM CDT.

* Primary threats include...
  A couple tornadoes possible
  Scattered damaging wind gusts to 70 mph possible
  Isolated very large hail events to 2 inches in diameter possible

SUMMARY...Ongoing semi-discrete supercell thunderstorms across
southwest Oklahoma should continue to move toward east-central
Oklahoma this evening while additional linearly organized storms
continue to intensify near a cold front. Damaging winds will be the
most prevalent risk, but some tornado potential will exist as well,
particularly as the low-level jet continues to strengthen this
evening.

The tornado watch area is approximately along and 55 statute miles
east and west of a line from 5 miles south of Durant OK to 25 miles
east northeast of Bartlesville OK. For a complete depiction of the
watch see the associated watch outline update (WOUS64 KWNS WOU4).

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 502...WW 503...

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 22035.

...Guyer

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.