Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
Note: Click for
Watch Status Reports.
SEL8
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 278
NWS STORM PREDICTION CENTER NORMAN OK
1150 PM CDT FRI MAY 8 2009
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
NORTH TEXAS
EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 1150 PM
UNTIL 500 AM CDT.
TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 95 STATUTE
MILES EAST AND WEST OF A LINE FROM 20 MILES NORTHEAST OF SHERMAN
TEXAS TO 55 MILES WEST SOUTHWEST OF TYLER TEXAS. FOR A COMPLETE
DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE
(WOUS64 KWNS WOU8).
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.
OTHER WATCH INFORMATION...THIS TORNADO WATCH REPLACES TORNADO
WATCH NUMBER 272. WATCH NUMBER 272 WILL NOT BE IN EFFECT AFTER
1150 PM CDT. CONTINUE...WW 273...WW 274...WW 276...WW 277...
DISCUSSION...SCTD...INTENSE SUSTAINED STORMS/SUPERCELLS EXPECTED TO
PERSIST THROUGH EARLY SAT IN AREA OF VERY MOIST AIR BENEATH DEEP
EML. COMBINATION OF STRONGER-THAN-PROGGED LLJ AND PRESENCE OF
EXISTING INTENSE UPDRAFTS SUGGEST A CONTINUED THREAT FOR VERY LARGE
HAIL/LOCALLY DMGG WIND...AND PERHAPS ISOLD TORNADOES AS STORMS
CONTINUE TO INTERACT AND PERHAPS GRADUALLY EVOLVE INTO A
SMALL...FORWARD-PROPAGATING MCS.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
550. MEAN STORM MOTION VECTOR 32025.
...CORFIDI
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW8
WW 278 TORNADO TX 090450Z - 091000Z
AXIS..95 STATUTE MILES EAST AND WEST OF LINE..
20NE GYI/SHERMAN TX/ - 55WSW TYR/TYLER TX/
..AVIATION COORDS.. 80NM E/W /41ESE ADM - 56ENE ACT/
HAIL SURFACE AND ALOFT..3 INCHES. WIND GUSTS..60 KNOTS.
MAX TOPS TO 550. MEAN STORM MOTION VECTOR 32025.
REPLACES WW 272..TX
LAT...LON 33909476 32029465 32029788 33909808
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU8.
Watch 278 Status Report Messages:
STATUS REPORT #1 ON WW 278
VALID 090655Z - 090740Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 45 N GGG TO
30 SW GYI TO 25 E SPS.
..SPC..05/09/09
ATTN...WFO...SHV...FWD...
&&
STATUS REPORT FOR WT 278
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
OKC089-090740-
OK
. OKLAHOMA COUNTIES INCLUDED ARE
MCCURTAIN
$$
TXC097-119-147-159-181-223-231-277-337-343-387-449-090740-
TX
. TEXAS COUNTIES INCLUDED ARE
COOKE DELTA FANNIN
FRANKLIN GRAYSON HOPKINS
HUNT LAMAR MONTAGUE
MORRIS RED RIVER TITUS
$$
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 (30%)
|
Probability of 1 or more strong (F2-F5) tornadoes
|
Low (20%)
|
Wind
Probability of 10 or more severe wind events
|
Mod (40%)
|
Probability of 1 or more wind events > 65 knots
|
Mod (30%)
|
Hail
Probability of 10 or more severe hail events
|
Mod (60%)
|
Probability
of 1 or
more hailstones > 2 inches
|
Mod (30%)
|
Combined Severe Hail/Wind
Probability of 6 or more combined severe hail/wind events
|
High (>95%)
|
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 
