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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.
SEL5
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 155
NWS STORM PREDICTION CENTER NORMAN OK
905 AM CDT FRI MAY 10 2013
THE NWS STORM PREDICTION CENTER HAS ISSUED A
* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
UPPER TEXAS COAST
COASTAL WATERS
* EFFECTIVE THIS FRIDAY MORNING AND AFTERNOON FROM 905 AM UNTIL
200 PM CDT.
* PRIMARY THREATS INCLUDE...
SEVERAL VERY LARGE HAIL EVENTS TO 2 INCHES IN DIAMETER POSSIBLE
SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 65
STATUTE MILES EITHER SIDE OF A LINE FROM 50 MILES NORTHEAST OF
HOUSTON TEXAS TO 10 MILES WEST OF PALACIOS TEXAS. FOR A COMPLETE
DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE
(WOUS64 KWNS WOU5).
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 154...
DISCUSSION...RELATIVELY WELL-ORGANIZED CLUSTERS OF INTENSE STORMS
WILL PERSIST WHILE MOVING ESEWD ACROSS THE UPPER TX COAST THROUGH
THE REST OF THE MORNING. THIS ACTIVITY IS BEING FUELED BY A PLUME OF
VERY UNSTABLE AIR STREAMING ACROSS AN OUTFLOW BOUNDARY LEFT IN THE
WAKE OF EARLIER MCS NOW MOVING OVER SE LA/MS DELTA. EXPECT GRADUAL
INCREASE IN CONVECTIVE VIGOR AS STORMS ENCOUNTER SOME INCREASE IN
DIURNAL DESTABILIZATION BEFORE MOVING OVER THE WRN GULF LATER. UNTIL
THEN...SHEAR PROFILES FROM HGX AND CRP SOUNDING SHOW MORE THAN
ADEQUATE SHEAR FOR SUPERCELL STRUCTURES AND/OR LINE SEGMENTS WITH
BOTH LARGE HAIL AND DMG WIND POTENTIAL.
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 29035.
...CARBIN
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW5
WW 155 SEVERE TSTM TX CW 101405Z - 101900Z
AXIS..65 STATUTE MILES EITHER SIDE OF LINE..
50NE HOU/HOUSTON TX/ - 10W PSX/PALACIOS TX/
..AVIATION COORDS.. 55NM EITHER SIDE /36ENE IAH - 6WSW PSX/
HAIL SURFACE AND ALOFT..2 INCHES. WIND GUSTS..60 KNOTS.
MAX TOPS TO 500. MEAN STORM MOTION VECTOR 29035.
LAT...LON 29459397 28039570 29439712 30869541
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU5.
Watch 155 Status Report Messages:
STATUS REPORT #2 ON WW 155
VALID 101640Z - 101740Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 10 S PSX TO
10 ESE LBX TO 35 WNW BPT.
COUNTIES CAN BE CLEARED FROM THE WATCH COINCIDENT WITH SQUALL
LINE PASSAGE.
..SMITH..05/10/13
ATTN...WFO...HGX...
&&
STATUS REPORT FOR WS 155
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
TXC039-071-167-101740-
TX
. TEXAS COUNTIES INCLUDED ARE
BRAZORIA CHAMBERS GALVESTON
$$
GMZ335-350-355-101740-
CW
. ADJACENT COASTAL WATERS INCLUDED ARE
GALVESTON BAY
COASTAL WATERS FROM FREEPORT TO MATAGORDA SHIP CHANNEL TX OUT 20
NM
COASTAL WATERS FROM HIGH ISLAND TO FREEPORT TX OUT 20 NM
$$
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.
$$
STATUS REPORT #1 ON WW 155
VALID 101535Z - 101640Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 15 WNW PSX
TO 40 W HOU TO 45 WNW BPT.
..SMITH..05/10/13
ATTN...WFO...HGX...
&&
STATUS REPORT FOR WS 155
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
TXC039-071-157-167-201-291-321-481-101640-
TX
. TEXAS COUNTIES INCLUDED ARE
BRAZORIA CHAMBERS FORT BEND
GALVESTON HARRIS LIBERTY
MATAGORDA WHARTON
$$
GMZ330-335-350-355-101640-
CW
. ADJACENT COASTAL WATERS INCLUDED ARE
MATAGORDA BAY
GALVESTON BAY
COASTAL WATERS FROM FREEPORT TO MATAGORDA SHIP CHANNEL TX OUT 20
NM
COASTAL WATERS FROM HIGH ISLAND TO FREEPORT TX OUT 20 NM
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
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 (50%)
|
Probability
of 1 or
more hailstones > 2 inches
|
Mod (40%)
|
Combined Severe Hail/Wind
Probability of 6 or more combined severe hail/wind events
|
High (70%)
|
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 
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