Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
Note: Click for
Watch Status Reports.
SEL4
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 884
NWS STORM PREDICTION CENTER NORMAN OK
1140 PM CDT TUE SEP 2 2008
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
EASTERN AND SOUTHWESTERN LOUISIANA
EXTREME SOUTHWESTERN MISSISSIPPI
EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 1140 PM
UNTIL 700 AM CDT.
TORNADOES...HAIL TO 0.5 INCH IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 40 STATUTE
MILES EAST AND WEST OF A LINE FROM 60 MILES NORTH OF NATCHEZ
MISSISSIPPI TO 85 MILES SOUTH SOUTHWEST OF ALEXANDRIA LOUISIANA.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU4).
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.
DISCUSSION...STORMS HAVE INCREASED IN INTENSITY DURING THE PAST HOUR
ALONG A CONVERGENCE BOUNDARY LOCATED IN ERN LA. DESPITE SOME WEAK
DIURNAL COOLING...MUCAPES AROUND 500 J/KG...SURFACE DEWPOINTS IN THE
MID 70S AND 1 KM SHEAR AT 30-40 KT WILL BE FAVORABLE FOR ROTATING
STORMS AND ISOLATED TORNADOES THROUGH THE OVERNIGHT HOURS.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 22030.
...IMY
SEL4
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 884
NWS STORM PREDICTION CENTER NORMAN OK
1140 PM CDT TUE SEP 2 2008
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
EASTERN AND SOUTHWESTERN LOUISIANA
EXTREME SOUTHWESTERN MISSISSIPPI
EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 1140 PM
UNTIL 700 AM CDT.
TORNADOES...HAIL TO 0.5 INCH IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 40 STATUTE
MILES EAST AND WEST OF A LINE FROM 60 MILES NORTH OF NATCHEZ
MISSISSIPPI TO 85 MILES SOUTH SOUTHWEST OF ALEXANDRIA LOUISIANA.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU4).
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.
DISCUSSION...STORMS HAVE INCREASED IN INTENSITY DURING THE PAST HOUR
ALONG A CONVERGENCE BOUNDARY LOCATED IN ERN LA. DESPITE SOME WEAK
DIURNAL COOLING...MUCAPES AROUND 500 J/KG...SURFACE DEWPOINTS IN THE
MID 70S AND 1 KM SHEAR AT 30-40 KT WILL BE FAVORABLE FOR ROTATING
STORMS AND ISOLATED TORNADOES THROUGH THE OVERNIGHT HOURS.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 22030.
...IMY
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW4
WW 884 TORNADO LA MS 030440Z - 031200Z
AXIS..40 STATUTE MILES EAST AND WEST OF LINE..
60N HEZ/NATCHEZ MS/ - 85SSW ESF/ALEXANDRIA LA/
..AVIATION COORDS.. 35NM E/W /37E MLU - 16ENE LCH/
HAIL SURFACE AND ALOFT..0.5 INCH. WIND GUSTS..60 KNOTS.
MAX TOPS TO 500. MEAN STORM MOTION VECTOR 22030.
LAT...LON 32499061 30269216 30269351 32499198
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU4.
Watch 884 Status Report Messages:
STATUS REPORT #1 ON WW 884
VALID 030855Z - 030940Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 2209
..DIAL..09/03/08
ATTN...WFO...LCH...SHV...JAN...LIX...
&&
STATUS REPORT FOR WT 884
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
LAC001-003-009-021-025-029-039-041-043-053-055-059-065-077-079-
083-097-107-125-030940-
LA
. LOUISIANA PARISHES INCLUDED ARE
ACADIA ALLEN AVOYELLES
CALDWELL CATAHOULA CONCORDIA
EVANGELINE FRANKLIN GRANT
JEFFERSON DAVIS LAFAYETTE LA SALLE
MADISON POINTE COUPEE RAPIDES
RICHLAND ST. LANDRY TENSAS
WEST FELICIANA
$$
MSC001-021-037-063-149-157-030940-
MS
. MISSISSIPPI COUNTIES INCLUDED ARE
ADAMS CLAIBORNE FRANKLIN
JEFFERSON WARREN WILKINSON
$$
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 (40%)
|
Probability of 1 or more strong (F2-F5) tornadoes
|
Low (20%)
|
Wind
Probability of 10 or more severe wind events
|
Low (20%)
|
Probability of 1 or more wind events > 65 knots
|
Low (20%)
|
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
|
Mod (50%)
|
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 
