Tornado Watch 448

Issued

Dec 27, 2018, 9:29 AM CST (15:29 UTC)

Expired

Dec 27, 2018, 6:00 PM CST

In force

9 hr

Issued by

the Storm Prediction Center

Largest hail expected

1 in

Strongest gust expected

60 kt

Two or more tornadoes

30%

One or more EF2 to EF5 tornadoes

10%

Ten or more severe wind reports

30%

One or more gusts of 65 knots or more

10%

Ten or more severe hail reports

5%

One or more hailstones of 2 inches or more

5%

Six or more combined severe hail and wind reports

50%

• Mesoscale Discussion 1735Dec 27, 7:12 AM CST
• Mesoscale Discussion 1736Dec 27, 9:00 AM CST
• Mesoscale Discussion 1737Dec 27, 1:50 PM CST

160 
WWUS20 KWNS 271526
SEL8  
SPC WW 271526
LAZ000-MSZ000-CWZ000-280000-

URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 448
NWS Storm Prediction Center Norman OK
930 AM CST Thu Dec 27 2018

The NWS Storm Prediction Center has issued a

* Tornado Watch for portions of 
  Eastern and southern Louisiana
  Southern Mississippi
  Coastal Waters

* Effective this Thursday morning and evening from 930 AM until
  600 PM CST.

* Primary threats include...
  A couple tornadoes possible
  Isolated damaging wind gusts to 70 mph possible

SUMMARY...A squall line will continue steadily east-northeastward
today across eastern/southern Louisiana into parts of
southern/central Mississippi. Although instability is not robust,
very strong deep-layer/low-level shear will be supportive of
embedded bowing segments and embedded mesovortices capable of wind
damage and some tornado risk.

The tornado watch area is approximately along and 95 statute miles
north and south of a line from 40 miles north of Lafayette LA to 60
miles east northeast of Mc Comb MS. For a complete depiction of the
watch see the associated watch outline update (WOUS64 KWNS WOU8).

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 447...

AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 1 inch. Extreme turbulence and surface wind
gusts to 60 knots. A few cumulonimbi with maximum tops to 500. Mean
storm motion vector 23035.

...Guyer

Tornado Watches in Louisiana, 2018Tornado Watches in Mississippi, 2018Every tornado watch in 2018

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.