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The expiration time in the watch graphic is amended if the watch is
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Watch Status Reports.
SEL3
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 393
NWS STORM PREDICTION CENTER NORMAN OK
550 PM CDT FRI JUN 12 2009
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
SOUTHERN MIDDLE TENNESSEE
EFFECTIVE THIS FRIDAY AFTERNOON FROM 550 PM UNTIL MIDNIGHT CDT.
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 100
STATUTE MILES EAST AND WEST OF A LINE FROM 65 MILES EAST
NORTHEAST OF JACKSON TENNESSEE TO 95 MILES WEST OF CHATTANOOGA
TENNESSEE. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).
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 388...WW 389...WW
390...WW 391...WW 392...
DISCUSSION...NRN PART OF LONG-LIVED DERECHO-PRODUCING MCS WILL
GLANCE SRN MIDDLE TN THIS EVE. MCS WILL CONTINUE TO MERGE WITH
INDEPENDENT STORMS AHEAD OF IT. IN ADDITION...WEAK SFC BOUNDARY
WITH LESS UNSTABLE AIR MASS TO ITS N WILL PERSIST ACROSS NRN MS/AL.
THESE FACTORS CAST SOME UNCERTAINTY AS TO HOW FAR N SVR THREAT WILL
EXTEND INTO MIDDLE TN. NEVERTHELESS...A CONDITIONAL THREAT FOR HIGH
WIND/HAIL WILL EXIST WITH ANY STRONGER STORMS THAT REMAIN/DEVELOP N
OF THE TN BORDER UNTIL LATER THIS EVE.
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 500. MEAN STORM
MOTION VECTOR 28035.
...CORFIDI
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW3
WW 393 SEVERE TSTM TN 122250Z - 130500Z
AXIS..100 STATUTE MILES EAST AND WEST OF LINE..
65ENE MKL/JACKSON TN/ - 95W CHA/CHATTANOOGA TN/
..AVIATION COORDS.. 85NM E/W /58W BNA - 35ENE MSL/
HAIL SURFACE AND ALOFT..1.5 INCHES. WIND GUSTS..60 KNOTS.
MAX TOPS TO 500. MEAN STORM MOTION VECTOR 28035.
LAT...LON 35938605 35008511 35008865 35938962
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU3.
Watch 393 Status Report Messages:
STATUS REPORT #4 ON WW 393
VALID 130230Z - 130340Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 30 NNE HSV
TO 20 SW BNA.
..GUYER..06/13/09
ATTN...WFO...OHX...
&&
STATUS REPORT FOR WS 393
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
TNC003-015-031-061-117-149-177-130340-
TN
. TENNESSEE COUNTIES INCLUDED ARE
BEDFORD CANNON COFFEE
GRUNDY MARSHALL RUTHERFORD
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 #3 ON WW 393
VALID 130230Z - 130340Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 30 NNE HSV
TO 20 SW BNA.
..GUYER..06/13/09
ATTN...WFO...OHX...
&&
STATUS REPORT FOR WS 393
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
TNC003-015-031-061-117-149-177-130340-
TN
. TENNESSEE COUNTIES INCLUDED ARE
BEDFORD CANNON COFFEE
GRUNDY MARSHALL RUTHERFORD
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 393
VALID 130135Z - 130240Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 35 NW HSV TO
50 SSW CKV.
FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 1087
..GUYER..06/13/09
ATTN...WFO...OHX...
&&
STATUS REPORT FOR WS 393
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
TNC003-015-031-055-061-081-101-117-119-149-177-187-130240-
TN
. TENNESSEE COUNTIES INCLUDED ARE
BEDFORD CANNON COFFEE
GILES GRUNDY HICKMAN
LEWIS MARSHALL MAURY
RUTHERFORD WARREN WILLIAMSON
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #1 ON WW 393
VALID 130115Z - 130240Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 20 NNE MSL
TO 40 NE MKL.
FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 1087
..GUYER..06/13/09
ATTN...WFO...OHX...
&&
STATUS REPORT FOR WS 393
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
TNC003-015-031-055-061-081-099-101-117-119-135-149-177-187-
130240-
TN
. TENNESSEE COUNTIES INCLUDED ARE
BEDFORD CANNON COFFEE
GILES GRUNDY HICKMAN
LAWRENCE LEWIS MARSHALL
MAURY PERRY RUTHERFORD
WARREN WILLIAMSON
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
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
|
Low (<5%)
|
Hail
Probability of 10 or more severe hail events
|
Low (20%)
|
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 
