Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
Note: Click for
Watch Status Reports.
SEL3
URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 453
NWS Storm Prediction Center Norman OK
900 PM CDT Wed Aug 26 2020
The NWS Storm Prediction Center has issued a
* Tornado Watch for portions of
Louisiana
Southwest Mississippi
Far East Texas
Coastal Waters
* Effective this Wednesday night and Thursday morning from 900 PM
until 800 AM CDT.
* Primary threats include...
A few tornadoes likely
SUMMARY...Hurricane Laura will approach the coast and make landfall
tonight, with a very strong low-level wind field overspreading the
region, accounting for the possibility of tornadoes through late
tonight and the morning hours of Thursday.
The tornado watch area is approximately along and 110 statute miles
east and west of a line from 20 miles northeast of Natchitoches LA
to 45 miles south southeast of Intracoastal City LA. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU3).
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 452...
AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 0 inches. Extreme turbulence and surface wind
gusts to 60 knots. A few cumulonimbi with maximum tops to 500. Mean
storm motion vector 15030.
...Guyer
SEL3
URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 453
NWS Storm Prediction Center Norman OK
900 PM CDT Wed Aug 26 2020
The NWS Storm Prediction Center has issued a
* Tornado Watch for portions of
Louisiana
Southwest Mississippi
Far East Texas
Coastal Waters
* Effective this Wednesday night and Thursday morning from 900 PM
until 800 AM CDT.
* Primary threats include...
A few tornadoes likely
SUMMARY...Hurricane Laura will approach the coast and make landfall
tonight, with a very strong low-level wind field overspreading the
region, accounting for the possibility of tornadoes through late
tonight and the morning hours of Thursday.
The tornado watch area is approximately along and 110 statute miles
east and west of a line from 20 miles northeast of Natchitoches LA
to 45 miles south southeast of Intracoastal City LA. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU3).
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 452...
AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 0 inches. Extreme turbulence and surface wind
gusts to 60 knots. A few cumulonimbi with maximum tops to 500. Mean
storm motion vector 15030.
...Guyer
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW3
WW 453 TORNADO LA MS TX CW 270200Z - 271300Z
AXIS..110 STATUTE MILES EAST AND WEST OF LINE..
20NE IER/NATCHITOCHES LA/ - 45SSE 7R4/INTRACOASTAL CITY LA/
..AVIATION COORDS.. 95NM E/W /45NNW AEX - 83SSW BTR/
WIND GUSTS..60 KNOTS.
MAX TOPS TO 500.MEAN STORM MOTION VECTOR 15030.
LAT...LON 31939098 29179002 29179367 31939473
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU3.
Watch 453 Status Report Messages:
STATUS REPORT #4 ON WW 453
VALID 271210Z - 271300Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 55 SSE 7R4
TO 20 WSW LFT TO 35 ESE POE TO 15 N POE TO 25 N IER.
WW 453 WILL BE ALLOWED TO EXPIRE AT 271300Z.
FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 1590.
..LEITMAN..08/27/20
ATTN...WFO...LCH...LIX...JAN...SHV...
&&
STATUS REPORT FOR WT 453
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
LAC005-007-009-025-029-033-037-039-043-045-047-051-055-057-059-
063-069-077-079-089-093-095-097-099-101-109-121-125-127-
271300-
LA
. LOUISIANA PARISHES INCLUDED ARE
ASCENSION ASSUMPTION AVOYELLES
CATAHOULA CONCORDIA EAST BATON ROUGE
EAST FELICIANA EVANGELINE GRANT
IBERIA IBERVILLE JEFFERSON
LAFAYETTE LAFOURCHE LA SALLE
LIVINGSTON NATCHITOCHES POINTE COUPEE
RAPIDES ST. CHARLES ST. JAMES
ST. JOHN THE BAPTIST ST. LANDRY ST. MARTIN
ST. MARY TERREBONNE WEST BATON ROUGE
WEST FELICIANA WINN
$$
MSC001-157-271300-
MS
. MISSISSIPPI COUNTIES INCLUDED ARE
ADAMS WILKINSON
$$
GMZ435-455-550-271300-
CW
. ADJACENT COASTAL WATERS INCLUDED ARE
VERMILION BAY
COASTAL WATERS FROM LOWER ATCHAFALAYA RIVER TO INTRACOASTAL CITY
LA OUT 20 NM
COASTAL WATERS FROM PORT FOURCHON LA TO LOWER ATCHAFALAYA RIVER
LA OUT 20 NM
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #3 ON WW 453
VALID 271030Z - 271140Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 75 S LCH TO
25 N LCH TO 25 SW POE TO 30 NNW IER.
WEST TO SOUTHWESTERLY LOW LEVEL FLOW MOVING INTO FAR SOUTHWEST LA
WILL CONTINUE TO LIMIT TORNADO POTENTIAL TO THE SOUTHWEST OF THE
CENTER OF HURRICANE LAURA. MAIN TORNADO THREAT CONTINUES IN THE
EASTERN SEMI-CIRCLE.
..LEITMAN..08/27/20
ATTN...WFO...LCH...LIX...JAN...SHV...
&&
STATUS REPORT FOR WT 453
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
LAC001-003-005-007-009-011-023-025-029-033-037-039-043-045-047-
051-053-055-057-059-063-069-077-079-089-093-095-097-099-101-109-
113-115-121-125-127-271140-
LA
. LOUISIANA PARISHES INCLUDED ARE
ACADIA ALLEN ASCENSION
ASSUMPTION AVOYELLES BEAUREGARD
CAMERON CATAHOULA CONCORDIA
EAST BATON ROUGE EAST FELICIANA EVANGELINE
GRANT IBERIA IBERVILLE
JEFFERSON JEFFERSON DAVIS LAFAYETTE
LAFOURCHE LA SALLE LIVINGSTON
NATCHITOCHES POINTE COUPEE RAPIDES
ST. CHARLES ST. JAMES ST. JOHN THE BAPTIST
ST. LANDRY ST. MARTIN ST. MARY
TERREBONNE VERMILION VERNON
WEST BATON ROUGE WEST FELICIANA WINN
$$
MSC001-157-271140-
MS
. MISSISSIPPI COUNTIES INCLUDED ARE
ADAMS WILKINSON
$$
GMZ435-452-455-550-271140-
CW
. ADJACENT COASTAL WATERS INCLUDED ARE
VERMILION BAY
COASTAL WATERS FROM INTRACOASTAL CITY TO CAMERON LA OUT 20 NM
COASTAL WATERS FROM LOWER ATCHAFALAYA RIVER TO INTRACOASTAL CITY
LA OUT 20 NM
COASTAL WATERS FROM PORT FOURCHON LA TO LOWER ATCHAFALAYA RIVER
LA OUT 20 NM
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #2 ON WW 453
VALID 270925Z - 271040Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 55 SSE BPT
TO 20 WSW LCH TO 30 SSE SHV.
THE GREATEST TORNADO THREAT WILL CONTINUE TO BE LOCATED EAST OF
THE CENTER OF HURRICANE LAURA THROUGH EARLY MORNING.
..LEITMAN..08/27/20
ATTN...WFO...LCH...LIX...JAN...SHV...
&&
STATUS REPORT FOR WT 453
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
LAC001-003-005-007-009-011-019-023-025-029-033-037-039-043-045-
047-051-053-055-057-059-063-069-077-079-085-089-093-095-097-099-
101-109-113-115-121-125-127-271040-
LA
. LOUISIANA PARISHES INCLUDED ARE
ACADIA ALLEN ASCENSION
ASSUMPTION AVOYELLES BEAUREGARD
CALCASIEU CAMERON CATAHOULA
CONCORDIA EAST BATON ROUGE EAST FELICIANA
EVANGELINE GRANT IBERIA
IBERVILLE JEFFERSON JEFFERSON DAVIS
LAFAYETTE LAFOURCHE LA SALLE
LIVINGSTON NATCHITOCHES POINTE COUPEE
RAPIDES SABINE ST. CHARLES
ST. JAMES ST. JOHN THE BAPTISTST. LANDRY
ST. MARTIN ST. MARY TERREBONNE
VERMILION VERNON WEST BATON ROUGE
WEST FELICIANA WINN
$$
MSC001-157-271040-
MS
. MISSISSIPPI COUNTIES INCLUDED ARE
ADAMS WILKINSON
$$
GMZ432-435-452-455-550-271040-
CW
. ADJACENT COASTAL WATERS INCLUDED ARE
CALCASIEU LAKE
VERMILION BAY
COASTAL WATERS FROM INTRACOASTAL CITY TO CAMERON LA OUT 20 NM
COASTAL WATERS FROM LOWER ATCHAFALAYA RIVER TO INTRACOASTAL CITY
LA OUT 20 NM
COASTAL WATERS FROM PORT FOURCHON LA TO LOWER ATCHAFALAYA RIVER
LA OUT 20 NM
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #1 ON WW 453
VALID 270645Z - 270740Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 5 S BPT TO
20 NE BPT TO 25 S SHV.
THE TORNADO THREAT ASSOCIATED WITH HURRICANE LAURA WILL REMAIN
CONFINED TO SUPERCELLS EMBEDDED IN BANDS ACROSS THE EASTERN
SEMI-CIRCLE, WHERE LOW LEVEL SHEAR IS MOST FAVORABLE.
FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 1589.
..LEITMAN..08/27/20
ATTN...WFO...LCH...LIX...JAN...SHV...
&&
STATUS REPORT FOR WT 453
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
LAC001-003-005-007-009-011-019-023-025-029-033-037-039-043-045-
047-051-053-055-057-059-063-069-077-079-085-089-093-095-097-099-
101-109-113-115-121-125-127-270740-
LA
. LOUISIANA PARISHES INCLUDED ARE
ACADIA ALLEN ASCENSION
ASSUMPTION AVOYELLES BEAUREGARD
CALCASIEU CAMERON CATAHOULA
CONCORDIA EAST BATON ROUGE EAST FELICIANA
EVANGELINE GRANT IBERIA
IBERVILLE JEFFERSON JEFFERSON DAVIS
LAFAYETTE LAFOURCHE LA SALLE
LIVINGSTON NATCHITOCHES POINTE COUPEE
RAPIDES SABINE ST. CHARLES
ST. JAMES ST. JOHN THE BAPTISTST. LANDRY
ST. MARTIN ST. MARY TERREBONNE
VERMILION VERNON WEST BATON ROUGE
WEST FELICIANA WINN
$$
MSC001-157-270740-
MS
. MISSISSIPPI COUNTIES INCLUDED ARE
ADAMS WILKINSON
$$
TXC351-403-270740-
TX
. TEXAS COUNTIES INCLUDED ARE
NEWTON SABINE
$$
GMZ430-432-435-450-452-455-550-270740-
CW
. ADJACENT COASTAL WATERS INCLUDED ARE
SABINE LAKE
CALCASIEU LAKE
VERMILION BAY
COASTAL WATERS FROM CAMERON LA TO HIGH ISLAND TX OUT 20 NM
COASTAL WATERS FROM INTRACOASTAL CITY TO CAMERON LA OUT 20 NM
COASTAL WATERS FROM LOWER ATCHAFALAYA RIVER TO INTRACOASTAL CITY
LA OUT 20 NM
COASTAL WATERS FROM PORT FOURCHON LA TO LOWER ATCHAFALAYA RIVER
LA OUT 20 NM
$$
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
|
Mod (60%)
|
Probability of 1 or more strong (EF2-EF5) tornadoes
|
Low (20%)
|
Wind
Probability of 10 or more severe wind events
|
Low (<5%)
|
Probability of 1 or more wind events > 65 knots
|
Low (<5%)
|
Hail
Probability of 10 or more severe hail events
|
Low (<5%)
|
Probability of 1 or more hailstones > 2 inches
|
Low (<5%)
|
Combined Severe Hail/Wind
Probability of 6 or more combined severe hail/wind events
|
Low (20%)
|
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% (EF2-EF5 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 
@NWSSPC
