Special Weather Statement, NWS Austin/San Antonio, TX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
302 AM CST TUE NOV 17 2015

.SHORT TERM (TODAY THROUGH WEDNESDAY)...

MAIN HIGHLIGHT WILL REMAIN ON NEXT 6-12 HOURS AS ISOLATED STRONG TO
SEVERE THUNDERSTORMS COULD BE POSSIBLE ACROSS THE I-35 CORRIDOR AND
POINTS EAST INTO THE COASTAL PLAINS THROUGH LATE TUESDAY MORNING.

LATEST OBSERVED ANALYSIS DEPICTS A WARM, MOIST BUT CAPPED AIRMASS
WITH ELEVATED INSTABILITY THAT IS TEMPERING THE CONVECTIVE POTENTIAL
ALONG THE CONVERGENCE FRONT IN THE HILL COUNTRY BUT IS ALLOWING FOR
ISENTROPIC UPGLIDE INDUCED ELEVATED THUNDERSTORMS ACROSS THE COASTAL
PLAINS. THE GREATEST LIGHTNING ACTIVITY IS CURRENTLY ASSOCIATED WITH
THE ELEVATED STORMS THAT ARE ABLE TO TAP INTO 1000-1500 J/KG CAPE
ABOVE 700MB. A SIGNIFICANT AMOUNT OF LOW-LVL SHEAR REMAINS IN PLACE
ACROSS MUCH OF THE REGION WITH 300-500 0-1KM ESRH AND WILL SUPPORT
ROTATING UPDRAFTS IF THEY GROW DEEP ENOUGH. THANKFULLY THE CAP IN
PLACE APPEARS TO BE JUST STRONG ENOUGH FOR STORMS NOT BE SURFACE
BASED AT THIS MOMENT. HOWEVER...AN EVOLUTION TOWARDS SURFACE BASED
CONVECTION WILL NEED TO BE CLOSELY MONITORED THROUGH THE MORNING
AS THE CONVERGENCE FRONTAL BOUNDARY INTERACTS WITH AN ENHANCED
AREA DIVERGENCE ALOFT AS IT REACHES THE I-35 CORRIDOR AND
CONTINUES EAST. ENOUGH SHEAR IS PRESENT THAT IF A STORM WHERE TO
BECOME SURFACE BASED...STRONG STRAIGHT-LINE WINDS AND A TORNADO
COULD BE POSSIBLE. SMALLER SHOWERS HAVE ALREADY BEEN ABLE TO
PRODUCE GUSTY 40-50 MPH WINDS GIVEN THE STRONG WINDS IN THE LOWEST
2000FT COMING DOWN TO THE SURFACE THROUGH PRECIPITATION LOADING.
THE ELEVATED STORMS OVER THE COASTAL PLAINS ARE EXHIBITING WEAK
ELEVATED ROTATION AND ELEVATED SUPERCELL STRUCTURES WHICH IS
INDICATIVE OF THE STRONG DEEP LAYER SHEAR OF 55 KT.

CONVECTIVE EVOLUTION WISE THROUGH THE MORNING...FEEL THERE WILL BE
AN UPTICK IN CONVECTIVE ACTIVITY ALONG THE MAIN FRONT AS IT
APPROACHES THE I-35 CORRIDOR. IN ADDITION...EXPECT ADDITIONAL
ELEVATED ACTIVITY TO STREAM UP FROM THE SOUTHWEST ALONG AND JUST
SOUTH OF THE 35 CORRIDOR INTO THE COASTAL PLAINS. NAM/GFS BUFR
SOUNDINGS CONTINUE TO SHOW A WEAK CAP THROUGH 6AM FOR I-35/37 AND
EAST THAT WILL HAMPER FULL ON SURFACE BASED CONVECTION BUT THE
CONVERGENCE OF THE SURFACE BOUNDARY MAY BE JUST ENOUGH TO GET THROUGH
THE CAP AND SUPPORT MORE ROBUST UPDRAFTS ACROSS THE COASTAL PLAINS.
THIS AREA WILL BE MORE SUPPORTIVE ENVIRONMENT FOR STORMS TO BE
POSSIBLY STRONG TO SEVERE. POCKETS OF HEAVY RAIN WILL BE LIKELY AS
WELL AS PWATS ARE WELL ABOVE NORMAL AND DECENT FORCING IS PRESENT.

STRONG TO SEVERE STORMS THREAT WILL BE EAST OF AUSTIN THROUGH 8AM
AND EAST OF THE ENTIRE REGION BY NOON. GRADUAL CLEARING IS EXPECTED
THROUGH THE DAY FROM WEST TO EAST AS DRIER AIR FILTERS IN FROM THE
NW. WINDS WILL GUST TO 25-35 MPH THIS AFTERNOON FROM NW WITH
SUSTAINED NEAR 15-20. THIS WILL BE JUST BELOW WIND ADVISORY
CRITERIA.

PLENTY OF SUN EXPECTED WEDNESDAY WITH TEMPERATURES REBOUNDING INTO
THE LOW TO MID 70S AREAWIDE.

&&

.LONG TERM (THURSDAY THROUGH NEXT MONDAY)...

NO MAJOR HIGHLIGHTS THROUGH THE LONG TERM OUTSIDE OF COLDER
TEMPERATURES LATE IN THE WEEK THAT MAY APPROACH THE MID 30S FOR
PORTIONS OF THE HILL COUNTY.

A STRONGER SURFACE HIGH WILL DEVELOP ACROSS THE CENTRAL PLAINS AND
SKIRT EAST ACROSS THE MS VALLEY BY FRIDAY. PWATS WILL FALL
DRASTICALLY TO 0.2-0.4" ACROSS THE REGION LATE WEEK AS A BROAD
LONGWAVE TROUGH OCCURS OVER THE ENTIRE CONUS. THIS SURFACE HIGH
SHOULD ALLOW FOR CALM WINDS AND MOSTLY CLEAR SKIES TO ALLOW FOR
DECENT RADIATIONAL COOLING MID TO LATE WEEK. SOME LOCAL COOL SPOTS
IN THE HILL COUNTRY COULD DIP INTO THE MID TO UPPER 30S.
HOWEVER...NO FREEZING TEMPERATURES ARE FORECAST AT THIS TIME. A
SHARPER TROUGH WILL PIVOT OUT OF CANADA OVER THE WEEKEND BUT PWATS
WILL STRUGGLE TO RECOVER AND ONLY SOME LIGHT SHOWER ACTIVITY MAY BE
POSSIBLE SATURDAY. THE CHANCES ARE QUITE LOW AT THIS POINT AND HAVE
PLACED ONLY 10-20% VALUES.

BY EARLY NEXT WEEK...A STRONGER SURFACE HIGH SHIFTS ACROSS THE
PLAINS THAT WILL REINFORCE THE COOLER TEMPERATURES WITH HIGHS
LIKELY NOT MAKING IT OUT OF THE 60S.

&&

.PRELIMINARY POINT TEMPS/POPS...
AUSTIN CAMP MABRY              71  47  75  47  73 /  90  -    0   0   0
AUSTIN BERGSTROM INTL AIRPORT  70  43  75  43  74 /  90  -    0   0   0
NEW BRAUNFELS MUNI AIRPORT     70  44  77  45  75 /  80  -    0   0   0
BURNET MUNI AIRPORT            68  43  72  44  71 /  30  -    0   0   0
DEL RIO INTL AIRPORT           74  43  76  44  74 /   0   0   0   0   0
GEORGETOWN MUNI AIRPORT        69  43  74  43  71 /  90  -    0   0   0
HONDO MUNI AIRPORT             74  41  76  41  75 /  10   0   0   0   0
SAN MARCOS MUNI AIRPORT        70  43  75  44  74 /  80  -    0   0   0
LA GRANGE - FAYETTE REGIONAL   75  46  75  46  74 / 100  -    0   0   0
SAN ANTONIO INTL AIRPORT       73  45  76  46  75 /  30  -    0   0   0
STINSON MUNI AIRPORT           74  45  77  45  76 /  30  -    0   0   0

&&

.EWX WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

MESOSCALE/AVIATION...17
SYNOPTIC/GRIDS...ALLEN

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SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
150 AM CST TUE NOV 17 2015

TXZ221>223-170830-
WILSON TX-KARNES TX-GONZALES TX-
150 AM CST TUE NOV 17 2015

...SIGNIFICANT WEATHER ADVISORY FOR EAST CENTRAL WILSON...
SOUTHWESTERN GONZALES AND NORTHEASTERN KARNES COUNTIES UNTIL 230 AM
CST...

AT 149 AM CST...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR
GILLETT...OR 11 MILES NORTHEAST OF KOSCIUSKO...MOVING NORTH AT 35
MPH.

WIND GUSTS UP TO 50 MPH WILL BE POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
GONZALES...NIXON...SMILEY...GILLETT...COST...BEBE...WRIGHTSBORO...
BELMONT...OAK FOREST...LEESVILLE AND MONTHALIA.

THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND
TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL
INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE.

LAT...LON 2910 9763 2904 9772 2908 9786 2952 9774
      2960 9767 2952 9742
TIME...MOT...LOC 0749Z 199DEG 30KT 2917 9776

TB3

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
232 AM CST TUE NOV 17 2015

TXZ208-209-223-224-170915-
DE WITT TX-FAYETTE TX-GONZALES TX-CALDWELL TX-
232 AM CST TUE NOV 17 2015

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL GONZALES...SOUTHWESTERN
FAYETTE...NORTHEASTERN DEWITT AND SOUTHEASTERN CALDWELL COUNTIES
UNTIL 315 AM CST...

AT 232 AM CST...DOPPLER RADAR WAS TRACKING STRONG THUNDERSTORMS NEAR
GONZALES...MOVING NORTHEAST AT 40 MPH.

FREQUENT CLOUD TO GROUND LIGHTNING AND WIND GUSTS UP TO 50 MPH WILL
BE POSSIBLE WITH THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
GONZALES...FLATONIA...WAELDER...HOCHHEIM...OAK FOREST...LITTLE NEW
YORK...COLONY...DILWORTH...DREYER...NICKLE...THOMPSONVILLE...DELHI...
MONTHALIA...OTTINE...COST...HAMON...ENGLE...GLAZE CITY...NEWTONVILLE
AND ELM GROVE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 10 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND
TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL
INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE.

&&

LAT...LON 2963 9704 2963 9714 2958 9721 2950 9720
      2939 9724 2936 9722 2926 9728 2944 9767
      2990 9745 2979 9732 2983 9727 2970 9699
TIME...MOT...LOC 0832Z 211DEG 36KT 2946 9749

TB3

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
309 AM CST TUE NOV 17 2015

TXZ193-194-209-223-171015-
FAYETTE TX-BASTROP TX-GONZALES TX-LEE TX-
309 AM CST TUE NOV 17 2015

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN BASTROP...
NORTHEASTERN GONZALES...FAYETTE AND CENTRAL LEE COUNTIES UNTIL 415 AM
CST...

AT 309 AM CST...DOPPLER RADAR WAS TRACKING STRONG THUNDERSTORMS OVER
FLATONIA...MOVING NORTHEAST AT 55 MPH.

FREQUENT CLOUD TO GROUND LIGHTNING STRIKES AND WIND GUSTS UP TO 50
MPH WILL BE POSSIBLE WITH THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
GIDDINGS...LA GRANGE...SMITHVILLE...SCHULENBURG...FLATONIA...
FAYETTEVILLE...ROUND TOP...MULDOON...CISTERN...DIME BOX...CARMINE...
ELLINGER...REK HILL...WILLOW SPRINGS...KOVAR...NECHANITZ...HOLMAN...
WALHALLA...NORTHRUP AND O QUINN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 10 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND
TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL
INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE.

&&

LAT...LON 2973 9678 2963 9701 2962 9717 2976 9735
      2979 9732 2981 9734 2982 9733 3044 9692
      3046 9688 3043 9687 3027 9668 3025 9669
      3024 9674 3020 9674 3016 9679 3014 9677
      3017 9669 3014 9665 3008 9663 2996 9657
TIME...MOT...LOC 0909Z 240DEG 49KT 2971 9710

TB3