Alert archive / Texas / Flash Flood Warnings in 2015

Flash Flood Warning 43, NWS Austin/San Antonio, TX

May 21, 2015Williamson County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at May 21, 2015, 12:46 AM CDT for Williamson County, Texas. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: May 21, 2015, 12:46 AM CDT (05:46 UTC)
Expired: May 21, 2015, 3:45 AM CDT
In force: 3 hr
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon
Flood severity: None

County Williamson County, TX

The radar

The Ft Hood radar (KGRK), 36 km from the middle of the area, began a volume at 05:47 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this flash flood warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 5.8 hours before the alert went out and 238 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 287 J/kg
Mixed-layer CIN: -197 J/kg
Mixed-layer LCL: 861 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 42 m²/s²
0-3 km storm-relative helicity: 51 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

673 
WGUS54 KEWX 210546
FFWEWX
TXC491-210845-
/O.NEW.KEWX.FF.W.0043.150521T0546Z-150521T0845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1246 AM CDT THU MAY 21 2015

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL WILLIAMSON COUNTY IN SOUTH CENTRAL TEXAS...

* UNTIL 345 AM CDT
    
* AT 1244 AM CDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING 
  HEAVY RAIN FROM JARRELL TO ANDICE TO FLORENCE TO EAST OF BERTRAM. 
  DOPPLER RADAR ESTIMATES SHOW UP TO TWO INCHES OF RAIN HAVE ALREADY 
  FALLEN. THE THUNDERSTORMS ARE MOVING SLOWLY TO THE SOUTHEAST. 
  FLASH FLOODING IS EXPECTED TO BEGIN SHORTLY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  ROUND ROCK...GEORGETOWN...GRANGER...SERENADA...BARTLETT...
  FLORENCE...JARRELL...LIBERTY HILL...WEIR...GEORGETOWN DAM...
  ANDICE...SUN CITY...WALBURG...SEWARD JUNCTION...THEON...JONAH AND
  SCHWERTNER.

ADDITIONAL RAINFALL AMOUNTS OF 2 TO 4 INCHES ARE POSSIBLE IN THE 
WARNED AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT
TO FLOODING WHEN WATER BEGINS RISING.

DO NOT ENTER OR CROSS FLOWING WATER OR WATER OF UNKNOWN DEPTH. 

STAY AWAY OR BE SWEPT AWAY. RIVER BANKS AND CULVERTS CAN BECOME
UNSTABLE AND UNSAFE.

&&

LAT...LON 3089 9773 3082 9747 3074 9728 3054 9762
      3062 9794 3063 9795 3062 9797 3064 9804
      3091 9783

$$

CP

2 follow-up statements

718 
WGUS74 KEWX 210724
FFSEWX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
224 AM CDT THU MAY 21 2015

TXC491-210845-
/O.CON.KEWX.FF.W.0043.000000T0000Z-150521T0845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WILLIAMSON TX-
224 AM CDT THU MAY 21 2015

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 345 AM CDT FOR
CENTRAL WILLIAMSON COUNTY...

AT 219 AM CDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING 
HEAVY RAIN BETWEEN JARRELL...ROUND ROCK AND ANDICE. DOPPLER RADAR 
SHOWS UP TO FOUR INCHES OF RAIN HAVE ALREADY FALLEN. RAIN GAUGES AT 
1 NNW OF LEANDER REPORTED 2.33 INCHES...4 NW OF GEORGETOWN REPORTED 
2.31 INCHES AND 3 SW OF FLORENCE INDICATED 1.95 INCHES HAVE ALREADY 
FALLEN. FLASH FLOODING WILL CONTINUE.

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
ROUND ROCK...GEORGETOWN...GRANGER...SERENADA...BARTLETT...FLORENCE...
JARRELL...LIBERTY HILL...WEIR...GEORGETOWN DAM...ANDICE...SUN CITY...
WALBURG...SEWARD JUNCTION...THEON...JONAH AND SCHWERTNER.

ADDITIONAL RAINFALL AMOUNTS OF 1 TO 2 INCHES ARE POSSIBLE IN THE 
WARNED AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING.

DO NOT ENTER OR CROSS FLOWING WATER OR WATER OF UNKNOWN DEPTH. 

STAY AWAY OR BE SWEPT AWAY. RIVER BANKS AND CULVERTS CAN BECOME
UNSTABLE AND UNSAFE.

&&

LAT...LON 3089 9773 3082 9747 3074 9728 3054 9762
      3062 9794 3063 9795 3062 9797 3064 9804
      3091 9783

$$

CP

667 
WGUS74 KEWX 210829
FFSEWX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
329 AM CDT THU MAY 21 2015

TXC491-210845-
/O.CON.KEWX.FF.W.0043.000000T0000Z-150521T0845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WILLIAMSON TX-
329 AM CDT THU MAY 21 2015

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 345 AM CDT FOR
CENTRAL WILLIAMSON COUNTY...

AT 326 AM CDT...DOPPLER RADAR INDICATED ONLY LIGHT TO MODERATE RAIN 
ACROSS THE WILLIAMSON COUNTY. DOPPLER RADAR SHOWS UP TO 5 INCHES OF 
RAIN HAVE ALREADY FALLEN MAINLY IN AN AREA BETWEEN GEORGETOWN... 
JARRELL AND ANDICE. RAIN GAUGES AT 4 NW OF GEORGETOWN REPORTED 2.60 
INCHES AND 1 NNW OF LEANDER REPORTED 2.46 INCHES. FLASH FLOODING 
WILL CONTINUE.

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
ROUND ROCK...GEORGETOWN...GRANGER...SERENADA...BARTLETT...FLORENCE...
JARRELL...LIBERTY HILL...WEIR...GEORGETOWN DAM...ANDICE...SUN CITY...
WALBURG...SEWARD JUNCTION...THEON...JONAH AND SCHWERTNER.

ADDITIONAL RAINFALL AMOUNTS OF UP TO 1/2 INCH ARE POSSIBLE IN THE 
WARNED AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING.

DO NOT ENTER OR CROSS FLOWING WATER OR WATER OF UNKNOWN DEPTH. 

STAY AWAY OR BE SWEPT AWAY. RIVER BANKS AND CULVERTS CAN BECOME
UNSTABLE AND UNSAFE.

&&

LAT...LON 3089 9773 3082 9747 3074 9728 3054 9762
      3062 9794 3063 9795 3062 9797 3064 9804
      3091 9783

$$

CP

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Austin/San Antonio, TX wrote its last area forecast discussion before this flash flood warning went out at May 21, 12:42 AM CDT, 4 minutes earlier.

Area forecast discussion, May 21, 12:42 AM CDT, 4 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1242 AM CDT THU MAY 21 2015

.AVIATION...
THE MAIN FEATURE WILL BE A SLOW MOVING MESOSCALE CONVECTIVE SYSTEM
THROUGH 12Z...AFFECTING THE I-35 CORRIDOR SITES. BASED ON
OBSERVATIONS FROM UPSTREAM METARS...EXPECT TEMPO 2-3SM TSRA BR
FROM 08-12Z. VCSH WILL CONTINUE AFTER 12Z...BUT THINK THIS WILL BE
MINIMAL. LOOK FOR IFR OR LOW MVFR CIGS FROM 12-18Z...THEN
IMPROVEMENT TO MVFR AFTER 18Z AND VFR BY AT KSAT/KSSF AFTER 02Z
FRIDAY. KDRT IS DIFFERENT WITH MORE EASTERLY WIND AND MUCH LOWER
PROSPECTS FOR RAIN...THUS ONLY VCSH FROM 12-18Z AND VFR CIGS UNTIL
00Z FRIDAY.

&&

.PREV DISCUSSION... /ISSUED 1003 PM CDT WED MAY 20 2015/

UPDATE...
WE HAVE INCREASING CONFIDENCE IN A HEAVY RAIN EVENT DEVELOPING FOR
THE HILL COUNTRY AND EDWARDS PLATEAU LATE THIS EVENING INTO EARLY
THURSDAY MORNING. PERSISTENT CONVECTION STARTED EARLIER BY A COLD
FRONT TO THE NORTH OF THE AREA HAS GENERATED A MESOSCALE
CONVECTIVE VORTEX...CENTERED OVER NORTHWESTERN EDWARDS COUNTY.
THIS MCV...ALONG WITH THE DIURNAL DEVELOPMENT OF THE SOUTHERLY LOW
LEVEL JET BRINGING UNSEASONABLY MOIST AIR INTO THE THUNDERSTORM
COMPLEX...INDICATES STORMS COULD PERSIST THROUGH THE NEXT 4-6
HOURS. STORM MOTIONS ARE VERY SLOW...EXACERBATING RAINFALL
AMOUNTS...WHICH COULD AVERAGE 2-4 INCHES WITH ISOLATED TOTALS UP
TO 6 INCHES. A FLASH FLOOD WATCH WAS JUST ISSUED TO COVER THE
POSSIBILITIES OVERNIGHT.

PREV DISCUSSION... /ISSUED 847 PM CDT WED MAY 20 2015/

UPDATE...
JUST SENT AN UPDATE TO INCREASE POPS IN THE NORTHWESTERN HALF OF
THE AREA AS THUNDERSTORM DEVELOPMENT HAS REMAINED PERSISTENT ALONG
THE COLD FRONT AS IT CONTINUES TO SAG SOUTH. SEVERE STORMS WITH
LARGE HAIL AND DAMAGING WINDS ARE STILL POSSIBLE IN THE EDWARDS
PLATEAU AND NORTHERN RIO GRANDE PLAINS THROUGH MIDNIGHT.

PREV DISCUSSION... /ISSUED 654 PM CDT WED MAY 20 2015/

AVIATION...
/00Z TAFS/
CURRENTLY AREA SITES REPORT VFR CONDITIONS AND EXPECTED TO REMAIN
THAT WAY THROUGH MIDNIGHT TONIGHT. AFTERWARD...CIGS WILL LOWER TO
MVFR/IFR CONDITIONS OVERNIGHT INTO MID DAY THURSDAY. A COLD FRONT
IS FORECAST TO PUSH ACROSS THE HILL COUNTRY AND EXPECTED TO STALL
ALONG THE ESCARPMENT AROUND 05Z TONIGHT. ISOLATED TO SCATTERED SHOWERS
AND ISOLATED THUNDERSTORMS ARE POSSIBLE ALONG THE BOUNDARY BUT AT
THIS TIME...OUR THINKING IS FOR CONVECTION TO STAY JUST TO THE
NORTH OF THE I-35 TERMINALS WITH SHOWER ACTIVITY GETTING INTO KDRT
FROM 02Z TO 05Z TONIGHT. WINDS WILL GENERALLY BE FROM THE EAST AT
5 TO 10 KNOTS.

PREV DISCUSSION... /ISSUED 612 PM CDT WED MAY 20 2015/

UPDATE...
JUST UPDATED ALL GRIDS AND TEXT FORECASTS TO LOWER POPS SOUTHEAST
THROUGH 12Z THURSDAY...LOWER POPS THIS EVENING FOR THE I-35
CORRIDOR...AND TO INCLUDE SEVERE THUNDERSTORM WATCH 192 UNTIL
MIDNIGHT FOR EDWARDS AND VAL VERDE COUNTIES. ALL HOURLY FORECAST
VARIABLES WERE ALSO UPDATED THROUGH 12Z THURSDAY. IN BRIEF...
CONVECTION IS A LITTLE FURTHER NORTH/WEST THAN PREVIOUS HI-RES
MODELS PROJECTED...BUT WE STILL EXPECT AN INCREASE IN STORM
COVERAGE LATER TONIGHT AS THE COLD FRONT CONTINUES TO SAG SOUTH
TOWARD OUR AREA. THE PRIMARY SEVERE THREAT WILL BE LARGE HAIL
THIS EVENING.

PREV DISCUSSION... /ISSUED 241 PM CDT WED MAY 20 2015/

SHORT TERM (TONIGHT THROUGH THURSDAY NIGHT)...
ALREADY THIS AFTERNOON SHOWERS AND STORMS WERE FIRING EAST OF THE
I35 CORRIDOR AS INSTABILITY IS OVERCOMING WEAK MORNING CAPPING.
THIS ISOLATED TO SCATTERED POTENTIAL SHOULD CONTINUE THROUGH THE
DAYLIGHT HOURS WHERE THE SUN IS EFFICIENTLY DESTABILIZING THE
SURFACE ATMOSPHERE. OUT WEST...HIGH INSTABILITY AND AN APPROACHING
COLD FRONT FROM THE NORTH IS INTERACTING WITH A DRY LINE PRODUCING
ISOLATED STRONG TO SEVERE CONVECTION IN THE BIG BEND AREA AND OFF
THE MEXICAN MOUNTAINS. AS THE COLD FRONT CONTINUES TO
APPROACH...EXPECTING THIS ACTIVITY TO ORGANIZE INTO A CLUSTER OF
STRONG STORMS CAPABLE OF LARGE HAIL AND DAMAGING WINDS. THE
EASTWARD PROPAGATION OF THIS ACTIVITY IS THE QUESTION. IT LOOKS
LIKE THE COLD FRONT WILL PUSH TO THE NORTHERN PERIPHERY COUNTIES
AFTER 00Z AND DEVELOP STORMS ALONG IT AND WEST OF THE I35
CORRIDOR. AFTER DARK...THE STORM INTENSITY SHOULD SUBSIDE AND THEN
THE THREAT BECOMES THE LOCALLY HEAVY RAIN THREAT AS IT HAS BEEN
THE LAST FEW DAYS.

THURSDAY IS LOOKING LIKE ANOTHER SIMILAR SET UP TO TODAY WITH THE
FRONT NOW STALLED TO OUR NORTH. SHOULD BE THE FOCUS FOR SHOWER AND
STORM ACTIVITY TOMORROW AFTERNOON. ANOTHER SUBTLE UPPER LEVEL
SHORTWAVE EMBEDDED IN THE SOUTHWEST FLOW IS EXPECTED TO ENHANCE
QPF RATES ALONG THE RGV THURSDAY NIGHT WHICH WILL CREATE ANOTHER
CHANCE FOR LOCALLY HEAVY RAIN.

LONG TERM (FRIDAY THROUGH WEDNESDAY)...
MODELS CONTINUE TO ADVERTISE STRONG AMPLIFICATION OF THE UPPER
LEVEL LOW OVER THE ROCKIES DUE A FAST MOVING SHORTWAVE ORIGINATING
FROM THE PACIFIC NORTHWEST. AS THIS FEATURE ROUNDS THE LOW...THE
LOW ITSELF PROGRESSES EASTWARD. 300 MB WINDS BEGIN TO INCREASE
SATURDAY AFTERNOON OVERTOP A VERY MOIST AIRMASS CHARACTERIZED BY
PWAT VALUES RANGING FROM 1.75 TO 2 INCHES. WITH A HEALTHY
SOUTHERLY LLJ...EMBEDDED SHORTWAVE...AND 300 MB RIGHT EXIT REGION
OVER SOUTH CENTRAL TEXAS OVERNIGHT SATURDAY ADVERTISED ON BOTH
MODELS BUT ESPECIALLY ON THE ECMWF...HEAVY RAINS LOOK LIKELY
BEGINNING SATURDAY EVENING THROUGH AS FAR AS MONDAY AFTERNOON. QPF
TOTALS LOOKS TO RANGE FROM 3-4 INCHES ACROSS MUCH OF THE WESTERN
CWA AND 2-3 INCHES IN THE EAST WITH ISOLATED AMOUNTS UP TO 6 OR 7
INCHES NOT OUT OF THE QUESTION.

THE DETAILS ARE A BIT LESS CLEAR BEYOND MONDAY AS A MORE BROAD
PATTERN WILL DEVELOP IN THE WESTERN CONUS. IT LOOKS LIKE AT LEAST
A FEW DAYS OF DRIER CONDITIONS WILL BE AROUND MID WEEK BEFORE
ANOTHER WEAKER SHORTWAVE COMES ON THE PACIFIC SHORE AND RAIN
RETURNS TO THE FORECAST LATE IN THE WEEK.

&&

.PRELIMINARY POINT TEMPS/POPS...
AUSTIN CAMP MABRY              79  67  83  70  83 /  40  40  40  40  60
AUSTIN BERGSTROM INTL AIRPORT  79  67  83  70  83 /  40  40  40  40  60
NEW BRAUNFELS MUNI AIRPORT     81  68  83  70  84 /  40  40  40  40  60
BURNET MUNI AIRPORT            75  64  80  69  81 /  40  40  40  40  60
DEL RIO INTL AIRPORT           81  70  85  70  84 /  50  60  30  40  60
GEORGETOWN MUNI AIRPORT        76  65  82  70  82 /  40  40  50  40  60
HONDO MUNI AIRPORT             82  69  84  70  83 /  50  50  30  40  60
SAN MARCOS MUNI AIRPORT        79  67  83  70  83 /  40  40  40  40  60
LA GRANGE - FAYETTE REGIONAL   82  70  83  70  84 /  50  30  50  30  40
SAN ANTONIO INTL AIRPORT       81  69  84  70  83 /  50  40  40  40  60
STINSON MUNI AIRPORT           82  70  84  70  84 /  50  40  40  40  60

&&

.EWX WATCHES/WARNINGS/ADVISORIES...
FLASH FLOOD WATCH UNTIL 10 AM CDT THIS MORNING FOR THE FOLLOWING
COUNTIES: BANDERA...BEXAR...BLANCO...BURNET...COMAL...EDWARDS...
GILLESPIE...HAYS...KENDALL...KERR...KINNEY...LLANO...MEDINA...
REAL...TRAVIS...UVALDE...WILLIAMSON.

&&

MESOSCALE/AVIATION...26
SYNOPTIC/GRIDS...18

Hazardous weather outlook, May 20, 7:35 AM CDT, 17 hours 11 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
735 AM CDT WED MAY 20 2015

TXZ171>173-183>194-202>209-217>225-228-211245-
LLANO-BURNET-WILLIAMSON-VAL VERDE-EDWARDS-REAL-KERR-BANDERA-
GILLESPIE-KENDALL-BLANCO-HAYS-TRAVIS-BASTROP-LEE-KINNEY-UVALDE-
MEDINA-BEXAR-COMAL-GUADALUPE-CALDWELL-FAYETTE-MAVERICK-ZAVALA-
FRIO-ATASCOSA-WILSON-KARNES-GONZALES-DE WITT-LAVACA-DIMMIT-
735 AM CDT WED MAY 20 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH CENTRAL TEXAS.

.DAY ONE...TODAY AND TONIGHT.

SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS ARE EXPECTED LATE
THIS AFTERNOON THROUGH MUCH OF THE EVENING ALONG AND NORTH OF A
ELGIN TO BOERNE TO CARRIZO SPRINGS LINE. SOME OF THESE STORMS ARE
CAPABLE OF PRODUCING HEAVY RAINFALL...WITH LOCALIZED RAINFALL
AMOUNTS OF 1 TO 3 INCHES POSSIBLE. THIS COULD RESULT IN FLASH
FLOODING OF ISOLATED STREAMS...CREEKS AND LOW WATER CROSSINGS. IN
ADDITION...A FEW STORMS COULD BECOME SEVERE...PRODUCING LARGE HAIL
UP TO GOLFBALL SIZE AND DAMAGING WIND GUSTS UP TO 60 MPH. THE
SHOWERS AND THUNDERSTORMS MAY CONTINUE THROUGH THE OVERNIGHT.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY.

SCATTERED SHOWERS AND STORMS WILL CONTINUE THURSDAY AND THURSDAY
NIGHT PRIMARILY ALONG AND SOUTH OF I-10. THE CHANCES FOR STORMS
WILL CONTINUE FRIDAY AND SATURDAY ACROSS ALL OF SOUTH-CENTRAL
TEXAS. LOCALLY HEAVY RAINFALL WILL REMAIN A POSSIBILITY THURSDAY
THROUGH EARLY SATURDAY.

MORE NUMEROUS SHOWERS AND THUNDERSTORMS ARE EXPECTED SATURDAY
NIGHT AND SUNDAY AS A STRONG UPPER LEVEL DISTURBANCE MOVES ACROSS
THE REGION. THE THREAT FOR LOCALLY HEAVY RAINFALL WILL INCREASE
DURING THIS TIME...WHICH COULD RESULT IN MORE WIDESPREAD FLASH
FLOODING. THERE IS A CHANCE THE HEAVY RAINFALL THREAT COULD LINGER
INTO MONDAY.

A FLASH FLOOD WATCH MAY BE REQUIRED LATER THIS WEEK OR WEEKEND.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE REQUIRED LATE THIS AFTERNOON AND EVENING
ALONG AND NORTH OF AN ELGIN TO BOERNE TO CARRIZO SPRINGS LINE.

In the hours before

Special weather statement, May 20, 9:31 PM CDT, 3 hours 15 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
931 PM CDT WED MAY 20 2015

TXZ171-210315-
LLANO TX-
931 PM CDT WED MAY 20 2015

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN LLANO COUNTY UNTIL 1015
PM CDT...

AT 930 PM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR
CASTELL...OR 14 MILES SOUTHWEST OF LLANO...MOVING NORTHWEST AT 25
MPH.

HALF INCH HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH
THIS STORM.

LOCATIONS IMPACTED INCLUDE...
LLANO...FIELD CREEK...VALLEY SPRING...PRAIRIE MOUNTAIN...BABY HEAD
AND CASTELL.

LAT...LON 3063 9873 3050 9896 3092 9896 3092 9861
TIME...MOT...LOC 0230Z 142DEG 20KT 3065 9889

ZEITLER

Special weather statement, May 20, 9:44 PM CDT, 3 hours 2 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
944 PM CDT WED MAY 20 2015

TXZ183>186-188-210330-
EDWARDS TX-VAL VERDE TX-GILLESPIE TX-REAL TX-KERR TX-
944 PM CDT WED MAY 20 2015

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN REAL...EDWARDS...
NORTHEASTERN VAL VERDE...SOUTHWESTERN GILLESPIE AND NORTHWESTERN KERR
COUNTIES UNTIL 1030 PM CDT...

AT 943 PM CDT...DOPPLER RADAR WAS TRACKING A LINE OF STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM NEAR JUNCTION TO 10 MILES
EAST OF JUNO...AND MOVING SOUTHEAST AT 15 MPH.

HALF INCH HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH
THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
ROCKSPRINGS...LOMA ALTA...HUNT...KERR WILDLIFE MANAGEMENT AREA...
CARTA VALLEY...MOUNTAIN HOME...FLOUR MILLS...HARPER...US-277 NEAR THE
SUTTON-EDWARDS COUNTY LINE...PRADE RANCH...US-377 NEAR THE
KIMBLE-EDWARDS COUNTY LINE...THE INTERSECTION OF I-10 AND U.S 290...
US-83 NEAR THE KERR-KIMBLE COUNTY LINE...I-10 NEAR THE KIMBLE-KERR
COUNTY LINE...VINEGARONE AND DEVILS SINKHOLE STATE NATURAL AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THESE STORMS...AND MAY
LEAD TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

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

&&

LAT...LON 3029 10068 3029 9933 3011 9919 2964 10075
      3018 10102
TIME...MOT...LOC 0243Z 308DEG 12KT 3054 9970 3016 10093

Special weather statement, May 20, 10:33 PM CDT, 2 hours 13 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1033 PM CDT WED MAY 20 2015

TXZ171-183>186-188-190-210430-
BLANCO TX-EDWARDS TX-LLANO TX-VAL VERDE TX-GILLESPIE TX-REAL TX-
KERR TX-
1033 PM CDT WED MAY 20 2015

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN REAL...SOUTHWESTERN
LLANO...EDWARDS...NORTHWESTERN BLANCO...EAST CENTRAL VAL VERDE...
GILLESPIE AND NORTHWESTERN KERR COUNTIES UNTIL 1130 PM CDT...

AT 1033 PM CDT...DOPPLER RADAR WAS TRACKING A LINE OF STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM NEAR CASTELL TO 6 MILES
NORTHWEST OF LOMA ALTA...AND MOVING SOUTHEAST AT 10 MPH.

HALF INCH HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH
THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
FREDERICKSBURG...ROCKSPRINGS...ROUND MOUNTAIN...LOMA ALTA...KERR
WILDLIFE MANAGEMENT AREA...PRAIRIE MOUNTAIN...OXFORD...BLOWOUT...
MOUNTAIN HOME...ECKERT...FLOUR MILLS...TIVYDALE...CRABAPPLE...DOSS...
HARPER...CHERRY SPRING...WILLOW CITY...ENCHANTED ROCK STATION...
US-377 NEAR THE KIMBLE-EDWARDS COUNTY LINE AND THE INTERSECTION OF
I-10 AND U.S 290.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THESE STORMS...AND MAY
LEAD TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

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

&&

LAT...LON 3044 9837 2971 10056 3001 10095 3029 10013
      3029 9930 3050 9931 3050 9897 3067 9896
      3070 9889
TIME...MOT...LOC 0333Z 300DEG 10KT 3065 9890 3001 10081

Special weather statement, May 20, 11:31 PM CDT, 1 hour 15 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1131 PM CDT WED MAY 20 2015

TXZ171-184>188-190-210515-
BLANCO TX-EDWARDS TX-LLANO TX-BANDERA TX-GILLESPIE TX-REAL TX-
KERR TX-
1131 PM CDT WED MAY 20 2015

...SIGNIFICANT WEATHER ADVISORY FOR REAL...SOUTHWESTERN LLANO...
CENTRAL EDWARDS...NORTHWESTERN BLANCO...NORTHWESTERN BANDERA...
GILLESPIE AND KERR COUNTIES UNTIL 1215 AM CDT...

AT 1130 PM CDT...DOPPLER RADAR WAS TRACKING A LINE OF STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM NEAR OXFORD TO 13 MILES
SOUTHEAST OF FLOUR MILLS...AND MOVING SOUTHEAST AT 25 MPH.

HALF INCH HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH
THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
KERRVILLE...FREDERICKSBURG...ROCKSPRINGS...ROUND MOUNTAIN...HUNT...
INGRAM...STONEWALL...KERR WILDLIFE MANAGEMENT AREA...SANDY...
OXFORD...BLOWOUT...MOUNTAIN HOME...KERRVILLE STATE PARK...ECKERT...
CRABAPPLE...DOSS...HARPER...CAIN CITY...LBJ STATE PARK AND ROCKY
HILL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THESE STORMS...AND MAY
LEAD TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

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

&&

LAT...LON 3036 9825 3014 9884 3014 9892 3011 9892
      2962 10017 2962 10028 2993 10061 3029 9976
      3029 9930 3048 9930 3050 9897 3063 9896
      3073 9871
TIME...MOT...LOC 0430Z 302DEG 23KT 3064 9870 2992 10048

Special weather statement, May 21, 12:10 AM CDT, 36 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1210 AM CDT THU MAY 21 2015

TXZ171-172-186>190-210615-
KENDALL TX-BURNET TX-BLANCO TX-LLANO TX-BANDERA TX-GILLESPIE TX-
KERR TX-
1210 AM CDT THU MAY 21 2015

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN LLANO...SOUTHWESTERN
BURNET...KENDALL...BLANCO...NORTHERN BANDERA...GILLESPIE AND EASTERN
KERR COUNTIES UNTIL 115 AM CDT...

AT 1208 AM CDT...DOPPLER RADAR WAS TRACKING A LINE OF STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM NEAR BERTRAM TO NEAR
CASTELL TO NEAR ROUND MOUNTAIN TO LUCKENBACH TO 7 MILES NORTH OF
CYPRESS CREEK TO NEAR KERR WILDLIFE MANAGEMENT AREA... AND MOVING
SOUTHEAST AT 25 MPH.

HALF INCH HAIL AND WINDS IN EXCESS OF 30 MPH WILL BE POSSIBLE WITH
THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
MEDINA...KERRVILLE...FREDERICKSBURG...BOERNE...KINGSLAND...MARBLE
FALLS...BURNET...COMFORT...BLANCO...BERTRAM...BANDERA...ROUND
MOUNTAIN...HUNT...GRANITE SHOALS...HORSESHOE BAY...INGRAM...
MEADOWLAKES...JOHNSON CITY...STONEWALL AND HIGHLAND HAVEN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THESE STORMS...AND MAY
LEAD TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

THESE STORMS 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 3077 9801 3004 9834 2974 9871 2968 9940
      3008 9953 3043 9903 3066 9860
TIME...MOT...LOC 0508Z 333DEG 23KT 3068 9817 3063 9854 3045 9843 3032
9849 3017 9875 3012 9897 3007 9943

CP

Special weather statement, May 21, 12:19 AM CDT, 27 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1219 AM CDT THU MAY 21 2015

TXZ173-210615-
WILLIAMSON TX-
1219 AM CDT THU MAY 21 2015

...SIGNIFICANT WEATHER ADVISORY FOR WILLIAMSON COUNTY UNTIL 115 AM
CDT...

AT 1218 AM CDT...DOPPLER RADAR WAS TRACKING A LINE OF STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM NEAR ANDICE TO NEAR
SERENADA TO NEAR LITTLE RIVER-ACADEMY...AND MOVING SOUTH AT 10 MPH.

HALF INCH HAIL AND WINDS IN EXCESS OF 30 MPH WILL BE POSSIBLE WITH
THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
ROUND ROCK...CEDAR PARK...GEORGETOWN...TAYLOR...GRANGER...SERENADA...
LEANDER...HUTTO...BARTLETT...FLORENCE...JARRELL...LIBERTY HILL...
WEIR...GEORGETOWN DAM...ANDICE...SUN CITY...GRANGER DAM...SANDOVAL...
HOXIE AND SCHWERTNER.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THESE STORMS...AND MAY
LEAD TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

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

THESE STORMS 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 3087 9762 3074 9727 3063 9722 3047 9777
      3064 9797 3088 9786 3091 9783 3091 9781
TIME...MOT...LOC 0518Z 008DEG 4KT 3075 9790 3077 9770 3093 9736

CP

The office that day

Everything else NWS Austin/San Antonio, TX issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 20, 8:07 PM CDT	Special Weather Statement	EWX	Edwards	38 min
May 20, 8:18 PM CDT	Special Weather Statement	EWX	Travis	27 min
May 20, 8:52 PM CDT	Severe Thunderstorm Warning	EWX	Edwards	38 min
May 20, 8:54 PM CDT	Special Weather Statement	EWX	Bandera, Kerr, Real, Uvalde, Zavala	51 min
May 20, 9:03 PM CDT	Severe Thunderstorm Warning	EWX	Edwards, Val Verde	42 min
May 20, 9:12 PM CDT	Special Weather Statement	EWX	Burnet	48 min
May 20, 9:31 PM CDT	Special Weather Statement	EWX	Llano	44 min
May 20, 9:44 PM CDT	Special Weather Statement	EWX	Edwards	46 min
May 20, 9:58 PM CDT	Flash Flood Watch	EWX	Atascosa, Bandera, Bexar, Blanco, Burnet, Comal and 17 more	10 hr
May 20, 10:33 PM CDT	Special Weather Statement	EWX	Edwards, Gillespie	57 min
May 20, 10:40 PM CDT	Flash Flood Warning	EWX	Llano	3 hr
May 20, 11:13 PM CDT	Flash Flood Warning	EWX	Gillespie, Kerr	5 hr
May 20, 11:31 PM CDT	Special Weather Statement	EWX	Edwards, Gillespie, Kerr, Llano, Real	44 min
May 20, 11:55 PM CDT	Areal Flood Advisory	EWX	Blanco, Burnet, Llano	3 hr
May 21, 12:10 AM CDT	Special Weather Statement	EWX	Bandera, Blanco, Gillespie, Kendall, Kerr	65 min
May 21, 12:13 AM CDT	Flash Flood Warning	EWX	Blanco, Burnet, Llano	3 hr
May 21, 12:19 AM CDT	Special Weather Statement	EWX	Williamson	56 min
May 21, 12:27 AM CDT	Areal Flood Advisory	EWX	Blanco, Kendall	3 hr
May 21, 12:58 AM CDT	Areal Flood Advisory	EWX	Bandera	3 hr
May 21, 1:13 AM CDT	Special Weather Statement	EWX	Bandera	62 min
May 21, 1:18 AM CDT	Flash Flood Warning	EWX	Travis	3 hr
May 21, 2:10 AM CDT	Areal Flood Advisory	EWX	Maverick, Uvalde, Zavala	3 hr
May 21, 2:14 AM CDT	Special Weather Statement	EWX	Maverick	61 min
May 21, 2:17 AM CDT	Areal Flood Advisory	EWX	Travis, Williamson	3 hr
May 21, 2:33 AM CDT	Areal Flood Advisory	EWX	Bexar	3 hr
May 21, 2:38 AM CDT	Flash Flood Warning	EWX	Maverick, Uvalde, Zavala	3 hr
May 21, 3:07 AM CDT	Special Weather Statement	EWX	Dimmit	53 min
May 21, 3:20 AM CDT	Areal Flood Advisory	EWX	Blanco, Burnet, Llano	115 min
May 21, 3:34 AM CDT	Severe Thunderstorm Warning	EWX	Dimmit	56 min
May 21, 3:44 AM CDT	Flash Flood Warning	EWX	Williamson	3 hr
May 21, 3:50 AM CDT	Areal Flood Advisory	EWX	Dimmit, Maverick	3 hr
May 21, 4:01 AM CDT	Flash Flood Warning	EWX	Dimmit, Maverick	3 hr
May 21, 4:12 AM CDT	Special Weather Statement	EWX	Dimmit	48 min
May 21, 4:18 AM CDT	Areal Flood Advisory	EWX	Travis	3 hr
May 21, 4:29 AM CDT	Severe Thunderstorm Warning	EWX	Dimmit	46 min
May 21, 5:26 AM CDT	Areal Flood Advisory	EWX	Maverick, Uvalde, Zavala	3 hr
May 21, 6:48 AM CDT	Areal Flood Advisory	EWX	Williamson	3 hr
May 21, 6:59 AM CDT	Areal Flood Advisory	EWX	Dimmit, Maverick	3 hr

Nearby

Flash Flood Warnings in Texas, 2015 Every flash flood warning in 2015

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.