Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
Note: Click for
Watch Status Reports.
SEL1
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 1
NWS STORM PREDICTION CENTER NORMAN OK
935 AM CST SAT JAN 3 2009
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
SOUTHEAST LOUISIANA
SOUTHERN MISSISSIPPI
COASTAL WATERS
EFFECTIVE THIS SATURDAY MORNING AND AFTERNOON FROM 935 AM UNTIL
500 PM CST.
HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 85
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 15 MILES NORTH
NORTHWEST OF INTRACOASTAL CITY LOUISIANA TO 10 MILES EAST
SOUTHEAST OF GULFPORT MISSISSIPPI. FOR A COMPLETE DEPICTION OF
THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS
WOU1).
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.
DISCUSSION...SCATTERED THUNDERSTORMS ARE INCREASING ACROSS SOUTH
CENTRAL LA AHEAD OF APPROACHING UPPER TROUGH. THESE STORMS ARE
FORECAST TO CONTINUE TO INTENSIFY THIS MORNING AND EARLY
AFTERNOON...SPREADING EAST-NORTHEASTWARD. MUCAPE VALUES 1500 J/KG
AND SUFFICIENT EFFECTIVE SHEAR WILL PROMOTE ORGANIZED AND/OR
SUPERCELL STORMS CAPABLE OF HAIL AND DAMAGING WINDS.
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM
MOTION VECTOR 25030.
...HART
SEL1
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 1
NWS STORM PREDICTION CENTER NORMAN OK
935 AM CST SAT JAN 3 2009
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
SOUTHEAST LOUISIANA
SOUTHERN MISSISSIPPI
COASTAL WATERS
EFFECTIVE THIS SATURDAY MORNING AND AFTERNOON FROM 935 AM UNTIL
500 PM CST.
HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 85
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 15 MILES NORTH
NORTHWEST OF INTRACOASTAL CITY LOUISIANA TO 10 MILES EAST
SOUTHEAST OF GULFPORT MISSISSIPPI. FOR A COMPLETE DEPICTION OF
THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS
WOU1).
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.
DISCUSSION...SCATTERED THUNDERSTORMS ARE INCREASING ACROSS SOUTH
CENTRAL LA AHEAD OF APPROACHING UPPER TROUGH. THESE STORMS ARE
FORECAST TO CONTINUE TO INTENSIFY THIS MORNING AND EARLY
AFTERNOON...SPREADING EAST-NORTHEASTWARD. MUCAPE VALUES 1500 J/KG
AND SUFFICIENT EFFECTIVE SHEAR WILL PROMOTE ORGANIZED AND/OR
SUPERCELL STORMS CAPABLE OF HAIL AND DAMAGING WINDS.
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM
MOTION VECTOR 25030.
...HART
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW1
WW 1 SEVERE TSTM LA MS CW 031535Z - 032300Z
AXIS..85 STATUTE MILES NORTH AND SOUTH OF LINE..
15NNW 7R4/INTRACOASTAL CITY LA/ - 10ESE GPT/GULFPORT MS/
..AVIATION COORDS.. 75NM N/S /47ESE LCH - 37SW SJI/
HAIL SURFACE AND ALOFT..1.5 INCHES. WIND GUSTS..60 KNOTS.
MAX TOPS TO 450. MEAN STORM MOTION VECTOR 25030.
LAT...LON 31209223 31568891 29118891 28759223
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU1.
Watch 1 Status Report Messages:
STATUS REPORT #4 ON WW 1
VALID 032045Z - 032140Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 45 S HUM TO
35 NNW MSY TO 35 S ESF.
..GUYER..01/03/09
ATTN...WFO...LIX...LCH...JAN...
&&
STATUS REPORT FOR WS 1
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
LAC033-037-051-057-063-071-075-077-087-089-091-095-103-105-117-
125-032140-
LA
. LOUISIANA PARISHES INCLUDED ARE
EAST BATON ROUGE EAST FELICIANA JEFFERSON
LAFOURCHE LIVINGSTON ORLEANS
PLAQUEMINES POINTE COUPEE ST. BERNARD
ST. CHARLES ST. HELENA ST. JOHN THE BAPTIST
ST. TAMMANY TANGIPAHOA WASHINGTON
WEST FELICIANA
$$
MSC001-005-031-035-037-045-047-059-065-067-073-077-085-091-109-
113-147-157-032140-
MS
. MISSISSIPPI COUNTIES INCLUDED ARE
ADAMS AMITE COVINGTON
FORREST FRANKLIN HANCOCK
HARRISON JACKSON JEFFERSON DAVIS
JONES LAMAR LAWRENCE
LINCOLN MARION PEARL RIVER
PIKE WALTHALL WILKINSON
$$
GMZ530-550-555-032140-
CW
. ADJACENT COASTAL WATERS INCLUDED ARE
LAKE PONTCHARTRAIN AND LAKE MAUREPAS
COASTAL WATERS FROM THE SOUTHWEST PASS OF THE MISSISSIPPI RIVER
TO LOWER ATCHAFALAYA RIVER LA OUT 20 NM
COASTAL WATERS FROM PASCAGOULA MS TO THE SOUTHWEST PASS OF THE
MISSISSIPPI RIVER 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 1
VALID 031950Z - 032040Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
..GUYER..01/03/09
ATTN...WFO...LIX...LCH...JAN...
&&
STATUS REPORT FOR WS 1
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
LAC005-007-033-037-045-047-051-055-057-063-071-075-077-087-089-
091-093-095-097-099-101-103-105-109-117-121-125-032040-
LA
. LOUISIANA PARISHES INCLUDED ARE
ASCENSION ASSUMPTION EAST BATON ROUGE
EAST FELICIANA IBERIA IBERVILLE
JEFFERSON LAFAYETTE LAFOURCHE
LIVINGSTON ORLEANS PLAQUEMINES
POINTE COUPEE ST. BERNARD ST. CHARLES
ST. HELENA ST. JAMES ST. JOHN THE BAPTIST
ST. LANDRY ST. MARTIN ST. MARY
ST. TAMMANY TANGIPAHOA TERREBONNE
WASHINGTON WEST BATON ROUGE WEST FELICIANA
$$
MSC001-005-031-035-037-045-047-059-065-067-073-077-085-091-109-
113-147-157-032040-
MS
. MISSISSIPPI COUNTIES INCLUDED ARE
ADAMS AMITE COVINGTON
FORREST FRANKLIN HANCOCK
HARRISON JACKSON JEFFERSON DAVIS
JONES LAMAR LAWRENCE
LINCOLN MARION PEARL RIVER
PIKE WALTHALL WILKINSON
$$
GMZ455-530-550-555-032040-
CW
. ADJACENT COASTAL WATERS INCLUDED ARE
COASTAL WATERS FROM LOWER ATCHAFALAYA RIVER TO INTRACOASTAL CITY
LA OUT 20 NM
LAKE PONTCHARTRAIN AND LAKE MAUREPAS
COASTAL WATERS FROM THE SOUTHWEST PASS OF THE MISSISSIPPI RIVER
TO LOWER ATCHAFALAYA RIVER LA OUT 20 NM
COASTAL WATERS FROM PASCAGOULA MS TO THE SOUTHWEST PASS OF THE
MISSISSIPPI RIVER 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 1
VALID 031845Z - 031940Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 4
..GUYER..01/03/09
ATTN...WFO...LIX...LCH...JAN...
&&
STATUS REPORT FOR WS 1
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
LAC005-007-033-037-045-047-051-055-057-063-071-075-077-087-089-
091-093-095-097-099-101-103-105-109-117-121-125-031940-
LA
. LOUISIANA PARISHES INCLUDED ARE
ASCENSION ASSUMPTION EAST BATON ROUGE
EAST FELICIANA IBERIA IBERVILLE
JEFFERSON LAFAYETTE LAFOURCHE
LIVINGSTON ORLEANS PLAQUEMINES
POINTE COUPEE ST. BERNARD ST. CHARLES
ST. HELENA ST. JAMES ST. JOHN THE BAPTIST
ST. LANDRY ST. MARTIN ST. MARY
ST. TAMMANY TANGIPAHOA TERREBONNE
WASHINGTON WEST BATON ROUGE WEST FELICIANA
$$
MSC001-005-031-035-037-045-047-059-065-067-073-077-085-091-109-
113-147-157-031940-
MS
. MISSISSIPPI COUNTIES INCLUDED ARE
ADAMS AMITE COVINGTON
FORREST FRANKLIN HANCOCK
HARRISON JACKSON JEFFERSON DAVIS
JONES LAMAR LAWRENCE
LINCOLN MARION PEARL RIVER
PIKE WALTHALL WILKINSON
$$
GMZ455-530-550-555-031940-
CW
. ADJACENT COASTAL WATERS INCLUDED ARE
COASTAL WATERS FROM LOWER ATCHAFALAYA RIVER TO INTRACOASTAL CITY
LA OUT 20 NM
LAKE PONTCHARTRAIN AND LAKE MAUREPAS
COASTAL WATERS FROM THE SOUTHWEST PASS OF THE MISSISSIPPI RIVER
TO LOWER ATCHAFALAYA RIVER LA OUT 20 NM
COASTAL WATERS FROM PASCAGOULA MS TO THE SOUTHWEST PASS OF THE
MISSISSIPPI RIVER 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 1
VALID 031725Z - 031840Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
..GUYER..01/03/09
ATTN...WFO...LIX...LCH...JAN...
&&
STATUS REPORT FOR WS 1
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
LAC005-007-033-037-045-047-051-055-057-063-071-075-077-087-089-
091-093-095-097-099-101-103-105-109-117-121-125-031840-
LA
. LOUISIANA PARISHES INCLUDED ARE
ASCENSION ASSUMPTION EAST BATON ROUGE
EAST FELICIANA IBERIA IBERVILLE
JEFFERSON LAFAYETTE LAFOURCHE
LIVINGSTON ORLEANS PLAQUEMINES
POINTE COUPEE ST. BERNARD ST. CHARLES
ST. HELENA ST. JAMES ST. JOHN THE BAPTIST
ST. LANDRY ST. MARTIN ST. MARY
ST. TAMMANY TANGIPAHOA TERREBONNE
WASHINGTON WEST BATON ROUGE WEST FELICIANA
$$
MSC001-005-031-035-037-045-047-059-065-067-073-077-085-091-109-
113-147-157-031840-
MS
. MISSISSIPPI COUNTIES INCLUDED ARE
ADAMS AMITE COVINGTON
FORREST FRANKLIN HANCOCK
HARRISON JACKSON JEFFERSON DAVIS
JONES LAMAR LAWRENCE
LINCOLN MARION PEARL RIVER
PIKE WALTHALL WILKINSON
$$
GMZ455-530-550-555-031840-
CW
. ADJACENT COASTAL WATERS INCLUDED ARE
COASTAL WATERS FROM LOWER ATCHAFALAYA RIVER TO INTRACOASTAL CITY
LA OUT 20 NM
LAKE PONTCHARTRAIN AND LAKE MAUREPAS
COASTAL WATERS FROM THE SOUTHWEST PASS OF THE MISSISSIPPI RIVER
TO LOWER ATCHAFALAYA RIVER LA OUT 20 NM
COASTAL WATERS FROM PASCAGOULA MS TO THE SOUTHWEST PASS OF THE
MISSISSIPPI RIVER 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
|
Low (20%)
|
Probability of 1 or more strong (F2-F5) tornadoes
|
Low (5%)
|
Wind
Probability of 10 or more severe wind events
|
Mod (30%)
|
Probability of 1 or more wind events > 65 knots
|
Mod (30%)
|
Hail
Probability of 10 or more severe hail events
|
Mod (40%)
|
Probability
of 1 or
more hailstones > 2 inches
|
Low (20%)
|
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.