Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
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Watch Status Reports.
SEL4
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 754
NWS STORM PREDICTION CENTER NORMAN OK
1025 PM CDT THU OCT 1 2009
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
EXTREME SOUTHEAST ARKANSAS
PARTS OF CENTRAL AND NORTHEAST LOUISIANA
EXTREME WEST CENTRAL MISSISSIPPI
EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 1025 PM
UNTIL 400 AM CDT.
HAIL TO 1 INCH 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 60
STATUTE MILES EAST AND WEST OF A LINE FROM 65 MILES NORTH
NORTHEAST OF MONROE LOUISIANA TO 30 MILES EAST SOUTHEAST OF
NATCHITOCHES LOUISIANA. FOR A COMPLETE DEPICTION OF THE WATCH
SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).
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 752...WW 753...
DISCUSSION...BAND OF SEVERE STORMS WILL CONTINUE TO MOVE EWD/SEWD
OVERNIGHT IMMEDIATELY IN ADVANCE OF A SURFACE COLD FRONT. THOUGH
THE ERN EXTENT OF THE LOW-LEVEL DESTABILIZATION IS IN QUESTION...A
FEED OF MOISTURE FROM THE S/SW AND RELATIVELY STEEP MID LEVEL LAPSE
RATES FROM THE W WILL MAINTAIN SUFFICIENT INSTABILITY FOR STORMS
CAPABLE OF PRODUCING DAMAGING WINDS AND ISOLATED LARGE HAIL. DEEP
LAYER VERTICAL SHEAR WILL ALSO REMAIN SUFFICIENT FOR EMBEDDED
BOWS/SUPERCELLS AS THE PRIMARY MID LEVEL TROUGH PASSES TO THE N OF
THIS AREA.
AVIATION...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 29030.
...THOMPSON
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW4
WW 754 SEVERE TSTM AR LA MS 020325Z - 020900Z
AXIS..60 STATUTE MILES EAST AND WEST OF LINE..
65NNE MLU/MONROE LA/ - 30ESE IER/NATCHITOCHES LA/
..AVIATION COORDS.. 50NM E/W /56NNE MLU - 20NNW AEX/
HAIL SURFACE AND ALOFT..1 INCH. WIND GUSTS..60 KNOTS.
MAX TOPS TO 500. MEAN STORM MOTION VECTOR 29030.
LAT...LON 33389055 31569161 31569365 33389263
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU4.
Watch 754 Status Report Messages:
STATUS REPORT #4 ON WW 754
VALID 020735Z - 020840Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 30 ENE ESF
TO 20 NNW HEZ.
..DIAL..10/02/09
ATTN...WFO...JAN...SHV...
&&
STATUS REPORT FOR WS 754
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
LAC029-020840-
LA
. LOUISIANA PARISHES INCLUDED ARE
CONCORDIA
$$
MSC001-037-063-020840-
MS
. MISSISSIPPI COUNTIES INCLUDED ARE
ADAMS FRANKLIN JEFFERSON
$$
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.
$$
STATUS REPORT #3 ON WW 754
VALID 020635Z - 020740Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 20 SE IER TO
30 SSE MLU TO 40 E MLU TO 60 WNW JAN.
..DIAL..10/02/09
ATTN...WFO...JAN...SHV...
&&
STATUS REPORT FOR WS 754
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
LAC025-029-041-043-059-065-107-020740-
LA
. LOUISIANA PARISHES INCLUDED ARE
CATAHOULA CONCORDIA FRANKLIN
GRANT LA SALLE MADISON
TENSAS
$$
MSC149-020740-
MS
. MISSISSIPPI COUNTIES INCLUDED ARE
WARREN
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #2 ON WW 754
VALID 020550Z - 020640Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 25 WSW IER
TO 40 SSW MLU TO 30 ENE MLU TO 55 E MLU.
..DIAL..10/02/09
ATTN...WFO...JAN...SHV...
&&
STATUS REPORT FOR WS 754
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
LAC021-025-029-041-043-059-065-069-083-085-107-020640-
LA
. LOUISIANA PARISHES INCLUDED ARE
CALDWELL CATAHOULA CONCORDIA
FRANKLIN GRANT LA SALLE
MADISON NATCHITOCHES RICHLAND
SABINE TENSAS
$$
MSC149-020640-
MS
. MISSISSIPPI COUNTIES INCLUDED ARE
WARREN
$$
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.
$$
STATUS REPORT #1 ON WW 754
VALID 020455Z - 020540Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
..GUYER..10/02/09
ATTN...WFO...JAN...SHV...
&&
STATUS REPORT FOR WS 754
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
ARC003-017-020540-
AR
. ARKANSAS COUNTIES INCLUDED ARE
ASHLEY CHICOT
$$
LAC021-025-029-035-041-043-049-059-065-067-069-073-083-085-107-
123-127-020540-
LA
. LOUISIANA PARISHES INCLUDED ARE
CALDWELL CATAHOULA CONCORDIA
EAST CARROLL FRANKLIN GRANT
JACKSON LA SALLE MADISON
MOREHOUSE NATCHITOCHES OUACHITA
RICHLAND SABINE TENSAS
WEST CARROLL WINN
$$
MSC055-125-149-151-020540-
MS
. MISSISSIPPI COUNTIES INCLUDED ARE
ISSAQUENA SHARKEY WARREN
WASHINGTON
$$
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 (10%)
|
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
|
Low (20%)
|
Hail
Probability of 10 or more severe hail events
|
Low (20%)
|
Probability
of 1 or
more hailstones > 2 inches
|
Low (10%)
|
Combined Severe Hail/Wind
Probability of 6 or more combined severe hail/wind events
|
Mod (60%)
|
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.