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The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
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Watch Status Reports.
SEL3
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 143
NWS STORM PREDICTION CENTER NORMAN OK
525 PM CDT SAT APR 27 2013
THE NWS STORM PREDICTION CENTER HAS ISSUED A
* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
NORTHERN AND CENTRAL ALABAMA
NORTHWEST GEORGIA
* EFFECTIVE THIS SATURDAY AFTERNOON FROM 525 PM UNTIL MIDNIGHT
CDT.
* PRIMARY THREATS INCLUDE...
SEVERAL DAMAGING WIND GUSTS TO 60 MPH POSSIBLE
SEVERAL LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 75
STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES NORTHEAST OF
HUNTSVILLE ALABAMA TO 30 MILES SOUTH SOUTHWEST OF BIRMINGHAM
ALABAMA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).
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 141...WW 142...
DISCUSSION...LARGE-SCALE FORCING FOR UPWARD VERTICAL MOTION
DEVELOPING EASTWARD ACROSS THE REGION...ALONG AND JUST SOUTH OF A
SURFACE FRONTAL ZONE ...IS EXPECTED TO CONTRIBUTE TO INCREASING
THUNDERSTORM ACTIVITY DURING THE NEXT FEW HOURS. IN CONJUNCTION
WITH STRONG DEEP LAYER SHEAR...DISCRETE STORMS...INCLUDING ISOLATED
SUPERCELLS...MAY EVOLVE INTO AN EASTWARD PROGRESSING ORGANIZED
CLUSTER OF STORMS BY THIS EVENING. GIVEN SOMEWHAT MARGINAL BOUNDARY
LAYER MOISTURE AND INSTABILITY...THE RISK FOR TORNADOES...WHILE
PERHAPS NOT COMPLETELY NEGLIGIBLE DUE TO SIZABLE LOW-LEVEL
SHEAR...APPEARS RELATIVELY LOW...WITH LARGE HAIL AND DAMAGING WIND
GUSTS PRIMARY SEVERE RISKS.
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 50
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM
MOTION VECTOR 25035.
...KERR
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW3
WW 143 SEVERE TSTM AL GA 272225Z - 280500Z
AXIS..75 STATUTE MILES EAST AND WEST OF LINE..
35NE HSV/HUNTSVILLE AL/ - 30SSW BHM/BIRMINGHAM AL/
..AVIATION COORDS.. 65NM E/W /59W GQO - 30S VUZ/
HAIL SURFACE AND ALOFT..1.5 INCHES. WIND GUSTS..50 KNOTS.
MAX TOPS TO 450. MEAN STORM MOTION VECTOR 25035.
LAT...LON 35008501 33158565 33158825 35008766
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU3.
Watch 143 Status Report Messages:
STATUS REPORT #2 ON WW 143
VALID 280145Z - 280240Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 35 ESE ANB
TO 10 NE BHM TO 45 SW HSV TO 35 E TUP.
..ROGERS..04/28/13
ATTN...WFO...BMX...HUN...FFC...
&&
STATUS REPORT FOR WS 143
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
ALC009-015-019-033-043-049-055-059-071-077-079-083-089-095-103-
115-280240-
AL
. ALABAMA COUNTIES INCLUDED ARE
BLOUNT CALHOUN CHEROKEE
COLBERT CULLMAN DEKALB
ETOWAH FRANKLIN JACKSON
LAUDERDALE LAWRENCE LIMESTONE
MADISON MARSHALL MORGAN
ST. CLAIR
$$
GAC047-055-083-115-295-280240-
GA
. GEORGIA COUNTIES INCLUDED ARE
CATOOSA CHATTOOGA DADE
FLOYD WALKER
$$
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.
$$
STATUS REPORT #1 ON WW 143
VALID 280000Z - 280140Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
..ROGERS..04/27/13
ATTN...WFO...BMX...HUN...FFC...
&&
STATUS REPORT FOR WS 143
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
ALC009-015-019-033-043-049-055-057-059-071-073-075-077-079-083-
089-093-095-103-107-115-117-121-125-127-133-280140-
AL
. ALABAMA COUNTIES INCLUDED ARE
BLOUNT CALHOUN CHEROKEE
COLBERT CULLMAN DEKALB
ETOWAH FAYETTE FRANKLIN
JACKSON JEFFERSON LAMAR
LAUDERDALE LAWRENCE LIMESTONE
MADISON MARION MARSHALL
MORGAN PICKENS ST. CLAIR
SHELBY TALLADEGA TUSCALOOSA
WALKER WINSTON
$$
GAC047-055-083-115-295-280140-
GA
. GEORGIA COUNTIES INCLUDED ARE
CATOOSA CHATTOOGA DADE
FLOYD WALKER
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
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 (<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 (30%)
|
Probability
of 1 or
more hailstones > 2 inches
|
Low (10%)
|
Combined Severe Hail/Wind
Probability of 6 or more combined severe hail/wind events
|
High (80%)
|
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 
@NWSSPC
