Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
Note: Click for
Watch Status Reports.
SEL2
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 12
NWS Storm Prediction Center Norman OK
910 PM CDT Sun Mar 18 2018
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Central and southwest Louisiana
Extreme southeast Texas
* Effective this Sunday night and Monday morning from 910 PM
until 100 AM CDT.
* Primary threats include...
Scattered large hail and isolated very large hail events to 2
inches in diameter possible
Isolated damaging wind gusts to 70 mph possible
A tornado or two possible
SUMMARY...Clusters of thunderstorms, some with embedded supercell
characteristics, will continue to spread eastward from southeast
Texas into Louisiana overnight. The strongest storms will be
capable of producing large hail and damaging winds, and an isolated
tornado cannot be ruled out.
The severe thunderstorm watch area is approximately along and 65
statute miles east and west of a line from 30 miles north northeast
of Natchitoches LA to 60 miles south southwest of Fort Polk LA. For
a complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU2).
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 11...
AVIATION...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
27035.
...Thompson
SEL2
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 12
NWS Storm Prediction Center Norman OK
910 PM CDT Sun Mar 18 2018
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Central and southwest Louisiana
Extreme southeast Texas
* Effective this Sunday night and Monday morning from 910 PM
until 100 AM CDT.
* Primary threats include...
Scattered large hail and isolated very large hail events to 2
inches in diameter possible
Isolated damaging wind gusts to 70 mph possible
A tornado or two possible
SUMMARY...Clusters of thunderstorms, some with embedded supercell
characteristics, will continue to spread eastward from southeast
Texas into Louisiana overnight. The strongest storms will be
capable of producing large hail and damaging winds, and an isolated
tornado cannot be ruled out.
The severe thunderstorm watch area is approximately along and 65
statute miles east and west of a line from 30 miles north northeast
of Natchitoches LA to 60 miles south southwest of Fort Polk LA. For
a complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU2).
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 11...
AVIATION...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
27035.
...Thompson
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW2
WW 12 SEVERE TSTM LA TX 190210Z - 190600Z
AXIS..65 STATUTE MILES EAST AND WEST OF LINE..
30NNE IER/NATCHITOCHES LA/ - 60SSW POE/FORT POLK LA/
..AVIATION COORDS.. 55NM E/W /50WSW MLU - 24WNW LCH/
HAIL SURFACE AND ALOFT..2 INCHES. WIND GUSTS..60 KNOTS.
MAX TOPS TO 500. MEAN STORM MOTION VECTOR 27035.
LAT...LON 32139179 30239248 30239465 32139401
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU2.
Watch 12 Status Report Messages:
STATUS REPORT #2 ON WW 12
VALID 190445Z - 190540Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 30 NW LFT TO
25 SSW ESF TO 15 ESE ESF.
..DIAL..03/19/18
ATTN...WFO...LCH...SHV...
&&
STATUS REPORT FOR WS 12
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
LAC009-039-079-097-190540-
LA
. LOUISIANA PARISHES INCLUDED ARE
AVOYELLES EVANGELINE RAPIDES
ST. LANDRY
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #1 ON WW 12
VALID 190335Z - 190440Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 20 NNE BPT
TO 30 W POE TO 20 ENE IER TO 25 S MLU.
..DIAL..03/19/18
ATTN...WFO...LCH...SHV...
&&
STATUS REPORT FOR WS 12
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
LAC001-003-009-011-019-021-039-043-053-059-069-079-097-115-127-
190440-
LA
. LOUISIANA PARISHES INCLUDED ARE
ACADIA ALLEN AVOYELLES
BEAUREGARD CALCASIEU CALDWELL
EVANGELINE GRANT JEFFERSON DAVIS
LA SALLE NATCHITOCHES RAPIDES
ST. LANDRY VERNON WINN
$$
TXC351-190440-
TX
. TEXAS COUNTIES INCLUDED ARE
NEWTON
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
Note:
Click for Complete Product Text.
Tornadoes
Probability of 2 or more tornadoes
|
Low (20%)
|
Probability of 1 or more strong (F2-F5) tornadoes
|
Low (<2%)
|
Wind
Probability of 10 or more severe wind events
|
Mod (30%)
|
Probability of 1 or more wind events > 65 knots
|
Low (10%)
|
Hail
Probability of 10 or more severe hail events
|
Mod (40%)
|
Probability of 1 or more hailstones > 2 inches
|
Mod (30%)
|
Combined Severe Hail/Wind
Probability of 6 or more combined severe hail/wind events
|
High (70%)
|
For each watch, probabilities for particular events inside the watch
(listed above in each table) are determined by the issuing forecaster.
The "Low" category contains probability values ranging from less than 2%
to 20% (F2-F5 tornadoes), less than 5% to 20% (all other probabilities),
"Moderate" from 30% to 60%, and "High" from 70% to greater than 95%.
High values are bolded and lighter in color to provide awareness of
an increased threat for a particular event.
weather.gov 
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