Tornado Watch 284

Issued

May 27, 2017, 7:01 PM CDT (00:01 UTC)

Expired

May 28, 2017, 12:32 AM CDT

In force

6 hr

Issued by

the Storm Prediction Center

Largest hail expected

2.5 in

Strongest gust expected

70 kt

The Springfield radar (KSGF), 127 km from the middle of the area, began a volume at 00:04 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

90%

One or more gusts of 65 knots or more

50%

Ten or more severe hail reports

50%

One or more hailstones of 2 inches or more

40%

Six or more combined severe hail and wind reports

95%

• Mesoscale Discussion 870May 27, 3:29 PM CDT
• Mesoscale Discussion 871May 27, 3:50 PM CDT
• Mesoscale Discussion 872May 27, 4:24 PM CDT
• Mesoscale Discussion 878May 27, 6:17 PM CDT
• Mesoscale Discussion 885May 27, 9:26 PM CDT

334 
WWUS20 KWNS 272358
SEL4  
SPC WW 272358
ARZ000-MOZ000-280700-

URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 284
NWS Storm Prediction Center Norman OK
700 PM CDT Sat May 27 2017

The NWS Storm Prediction Center has issued a

* Tornado Watch for portions of 
  Northern and western Arkansas
  Southern Missouri

* Effective this Saturday night and Sunday morning from 700 PM
  until 200 AM CDT.

* Primary threats include...
  A few tornadoes and a couple intense tornadoes possible
  Widespread damaging winds likely with isolated significant gusts
    to 80 mph possible
  Scattered large hail and isolated very large hail events to 2.5
    inches in diameter possible

SUMMARY...Severe thunderstorms will continue to develop within a
highly unstable environment from far southern Missouri into northern
and western Arkansas. Tornadoes will especially be possible with any
storm along a roughly west-east outflow boundary along the
Missouri/Arkansas border vicinity, while semi-discrete supercells or
evolving line-embedded mesovortices would also pose a tornado risk.
Otherwise, widespread and locally intense damaging winds will be
highly likely as storms accelerate east/southeastward this evening.

The tornado watch area is approximately along and 70 statute miles
north and south of a line from 60 miles west southwest of Harrison
AR to 35 miles east southeast of Poplar Bluff MO. 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 275...WW 276...WW
277...WW 278...WW 279...WW 280...WW 281...WW 282...WW 283...

AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 2.5 inches. Extreme turbulence and surface wind
gusts to 70 knots. A few cumulonimbi with maximum tops to 650. Mean
storm motion vector 29035.

...Guyer

Tornado Watches in Arkansas, 2017Tornado Watches in Missouri, 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.