National Weather Service United States Department of Commerce

South Texas Heavy Rain, Flooding, and Severe Weather Event - May 11th and 12th, 2015


At around 200 PM CDT on May 11th, 2015, showers and thunderstorms began developing across the South Texas Brush Country. This was due to a very moist and extremely unstable airmass residing across South Texas. A slow-moving cold front and outflow boundary (image to the right) along with an upper level disurbance set the stage for a widespread heavy rain and flooding event that peaked from the evening on the 11th into the morning hours of the 12th. Widespread 2 to 4 inches of rain fell across South Texas. Many areas across San Patricio...Nueces... Kleberg and southern Jim Wells counties generally received 4 to 6 inches. Southern Duval and southeastern Webb counties received as much as 8 to 10 inches!

Due to the very heavy rainfall, many streets and low-lying areas became flooded due to high water. Hardest hit areas were Benavides, near Ramirez and west of Realitos in Duval county where several county roads were closed due to high water. Even a portion of state highway 16 was closed for a time due to high water. 3 to 5 feet of water affected portions of Benavides. Other hard-hit areas included Corpus Christi, Robstown, Aransas Pass, and Port Aransas. Many flooded roads and low-lying areas occurred during the morning hours on the 12th across these areas.

Several rivers rose sharply due to runoff from the heavy rain. In particular, Oso Creek rose from nearly 6 feet to more than 20 feet in less than two hours! Oso Creek is expected to crest around 28.5 feet during the morning hours on the 13th. Ongoing major flooding will persist for more than 48 hours. This Oso Creek flooding event already ranks as the 4th highest crest ever recorded but may become the 3rd highest of all-time on the 13th.

Besides the heavy rain and flooding. there were several severe thunderstorms which affected South Texas during the evening of the 11th and during the morning of the 12th. The strongest thunderstorm affected Riviera with 70-80 winds due to a downburst. Damaging wind gusts generally between 40 and 60 mph occurred across portions of the Coastal Bend during the early morning hours. A peak measured wind gust of 66 mph occurred at the Corpus Christi Naval Air Station at 331 AM CDT on the 12th. These strong winds produced sporadic damage that included downed trees and power poles either bent or blown completely down.

KCRP Radar Loop - 204 PM CDT May 11 through 858 AM CDT May 12, 2015
Velocity Couplet near Riviera - 252 AM CDT May 12, 2015 Mesovortex Signature near Riviera - 252 AM CDT May 12, 2015
Damage Survey of the Riviera Downburst
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CORPUS CHRISTI TX
307 PM CDT TUE MAY 12 2015

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0252 AM     TSTM WND DMG     RIVIERA                 27.28N 97.82W
05/12/2015                   KLEBERG            TX   NWS STORM SURVEY

            NWS STORM SURVEY IDENTIFIED AN 8 1/2 MILE PATH OF
            STRAIGHT LINE WIND DAMAGE EXTENDING FROM RIVIERA TO THE
            PORT ALTO PUBLIC BEACH. PEAK WIND GUSTS WERE ESTIMATED AT
            70-80 MPH. HUNDREDS OF LARGE TREES WERE DAMAGED OR
            SNAPPED. A FEW SHINGLES WERE MISSING FROM THE ROOF OF A
            HOME IN RIVIERA. SEVERAL UTILITY POLES WERE DAMAGED. THE
            SCOREBOARD FROM THE RIVIERA HIGH SCHOOL FOOTBALL FIELD
            AND DUGGOUT FROM THE BASEBALL FIELD WERE DESTROYED.

Riviera Wind Damage Pics
Riviera Riviera Riviera Riviera Riviera
PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE CORPUS CHRISTI TX
1212 PM CDT TUE MAY 12 2015

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0620 PM     FLASH FLOOD      BRUNI                   27.43N 98.84W
05/11/2015                   WEBB               TX   CO-OP OBSERVER

            LOW LYING AREAS AROUND BRUNI FLOODED DUE TO 5 INCHES OF
            RAINFALL.

0710 PM     TSTM WND DMG     8 SE REALITOS           27.34N 98.46W
05/11/2015                   DUVAL              TX   LAW ENFORCEMENT

            TREES DOWN IN RAMIREZ.

0710 PM     TSTM WND DMG     12 WSW PREMONT          27.29N 98.30W
05/11/2015                   DUVAL              TX   LAW ENFORCEMENT

            POWER POLES BLOWN DOWN NEAR FM 1329 AND CR 236

0935 PM     FLASH FLOOD      RAMIREZ                 27.35N 98.41W
05/11/2015                   DUVAL              TX   LAW ENFORCEMENT

            DUVAL SHERIFFS OFFICE REPORTED FM 339 NEAR RAMIREZ WAS
            CLOSED DUE TO FLOODING. COUNTY ROAD 250 SOUTH OF RAMIREZ
            TO FM 3249 WAS ALSO CLOSED.

1005 PM     FLOOD            6 W REALITOS            27.44N 98.63W
05/11/2015                   DUVAL              TX   LAW ENFORCEMENT

            STATE HIGHWAY 16 NEAR COUNTY ROAD 313 CLOSED DUE TO HIGH
            WATER.

0118 AM     MARINE TSTM WIND 2 E PORT OCONNOR        28.45N 96.40W
05/12/2015  M42.00 MPH       GMZ330             TX   MESONET

            PORT OCONNOR T-COON GUST 37 KNOTS

0207 AM     TSTM WND GST     N CORPUS CHRISTI        27.77N 97.50W
05/12/2015  M59.00 MPH       NUECES             TX   ASOS

            59 MPH WIND GUST AT CORPUS CHRISTI INTERNATIONAL AIRPORT.


0209 AM     TSTM WND GST     N CORPUS CHRISTI        27.77N 97.50W
05/12/2015  M59.00 MPH       NUECES             TX   ASOS

0312 AM     TSTM WND DMG     6 SSE CORPUS CHRISTI    27.69N 97.46W
05/12/2015                   NUECES             TX   BROADCAST MEDIA

            POWER POLES SNAPPED ON EVERHART NEAR BONNER.

0325 AM     FLASH FLOOD      CORPUS CHRISTI          27.71N 97.29W
05/12/2015                   NUECES             TX   EMERGENCY MNGR

            WATER OVER THE ROADWAYS IN THE NORTHWEST PART OF CORPUS
            CHRISTI.

0330 AM     MARINE TSTM WIND 2 NW CORPUS CHRISTI NOR 27.84N 97.40W
05/12/2015  M43.00 MPH       GMZ230             TX   MESONET

            PORT ARANSAS T-COON 37 KNOT GUST

0330 AM     FLASH FLOOD      BENAVIDES               27.60N 98.41W
05/12/2015                   DUVAL              TX   LAW ENFORCEMENT

            FLOODING OCCURRED IN BENAVIDES WITH 3-4 FEET OF WATER
            FLOWING THROUGH LOW LYING AREAS WITHIN CITY. WATER ALMOST
            REACHED CITY HALL. 3-5 FEET OF WATER OVER INTERSECTION OF
            HUMBLE AND MAIN STREETS.

0331 AM     TSTM WND GST     1 S CORPUS CHRISTI      27.69N 97.29W
05/12/2015  M66.00 MPH       NUECES             TX   ASOS

            66 MPH WIND GUST AT NAS CC

0355 AM     FLASH FLOOD      CORPUS CHRISTI          27.71N 97.29W
05/12/2015                   NUECES             TX   EMERGENCY MNGR

            SPID AT LEOPARD IS CLOSED DUE TO WATER OVER THE HIGHWAY.


0400 AM     FLASH FLOOD      ROBSTOWN                27.80N 97.66W
05/12/2015                   NUECES             TX   LAW ENFORCEMENT

            MANY ROADS IN AND AROUND ROBSTOWN FLOODED.

0400 AM     FLASH FLOOD      AGUA DULCE              27.78N 97.91W
05/12/2015                   NUECES             TX   PUBLIC

            NUMEROUS ROADS AND PARKING LOTS FLOODED PER PHOTOS. TIME
            ESTIMATED FROM RADAR.

0406 AM     MARINE TSTM WIND 5 NNE ROCKPORT          28.11N 97.02W
05/12/2015  M48.00 MPH       ARANSAS            TX   MESONET

            COPANO BAY 42 KNOTS GUST

0406 AM     MARINE TSTM WIND 12 SSW MALAQUITE BEACH  27.30N 97.40W
05/12/2015  M46.00 MPH       KLEBERG            TX   MESONET

            BAFFIN BAY 39.8 KNOTS PEAK.

0415 AM     FLASH FLOOD      ROBSTOWN                27.80N 97.66W
05/12/2015                   NUECES             TX   PUBLIC

            NUMEROUS ROADS FLOODED PER PHOTOS. TIME ESTIMATED FROM
            RADAR.

0415 AM     FLASH FLOOD      5 SW CORPUS CHRISTI     27.70N 97.48W
05/12/2015                   NUECES             TX   TRAINED SPOTTER

            SPOTTER REPORTED WATER FLOWING OVER FM 43 NEAR
            INTERSECTION WITH FM 665. ROAD WAS IMPASSABLE.

0418 AM     MARINE TSTM WIND 2 NNW PADRE ISLES COUNT 27.63N 97.24W
05/12/2015  M55.00 MPH       NUECES             TX   MESONET

            PACKERY CHANNEL 48 KNOT PEAK GUST

0425 AM     FLASH FLOOD      5 SE CORPUS CHRISTI     27.70N 97.36W
05/12/2015                   NUECES             TX   NWS EMPLOYEE

            FLOOD WATERS MAKING SARATOGA IMPASSABLE NEAR JOHN PAUL
            SCHOOL. FLOOD WATERS CAUSING PROBLEMS NEAR STAPLES AND
            EVERHART ALSO.

0430 AM     MARINE TSTM WIND NURSERY                 27.83N 97.51W
05/12/2015  M41.00 MPH       VICTORIA           TX   MESONET

0430 AM     FLASH FLOOD      8 W CORPUS CHRISTI      27.77N 97.63W
05/12/2015                   NUECES             TX   NWS EMPLOYEE

            LANES CLOSED ON HWY 44 AT CLARKWOOD DUE TO WATER OVER
            ROAD.

0443 AM     FLASH FLOOD      4 SE CORPUS CHRISTI     27.71N 97.37W
05/12/2015                   NUECES             TX   NWS EMPLOYEE

            SPID AND STAPLES FLOODED WITH CARS ABANDONED.

0500 AM     MARINE TSTM WIND 1 E PORT ARANSAS        27.83N 97.05W
05/12/2015  M46.00 MPH       NUECES             TX   C-MAN STATION

            PEAK GUST AT PORT ARANSAS C-MAN 40 KNOTS

0530 AM     FLASH FLOOD      PORT ARANSAS            27.83N 97.08W
05/12/2015                   NUECES             TX   PUBLIC

            NUMEROUS ROADS FLOODED PER PHOTOS. TIME ESTIMATED FROM
            RADAR.

0530 AM     FLASH FLOOD      ARANSAS PASS            27.89N 97.14W
05/12/2015                   SAN PATRICIO       TX   PUBLIC

            NUMEROUS ROADS FLOODED PER PHOTOS. TIME ESTIMATED FROM
            RADAR.

0700 AM     HEAVY RAIN       9 SE CORPUS CHRISTI     27.61N 97.19W
05/12/2015  M4.60 INCH       GMZ250             TX   NWS EMPLOYEE

0700 AM     HEAVY RAIN       10 SE CORPUS CHRISTI    27.60N 97.18W
05/12/2015  M7.11 INCH       GMZ250             TX   ASOS

            2.5 INCHES IN 30 MINS.

0700 AM     HEAVY RAIN       CORPUS CHRISTI          27.78N 97.51W
05/12/2015  M4.81 INCH       NUECES             TX   ASOS

0700 AM     HEAVY RAIN       3 S WOODSBORO           28.19N 97.32W
05/12/2015  M5.37 INCH       REFUGIO            TX   COCORAHS

0700 AM     HEAVY RAIN       12 NW MATHIS            28.22N 97.96W
05/12/2015  M4.96 INCH       LIVE OAK           TX   COCORAHS

0700 AM     HEAVY RAIN       BAYSIDE                 28.08N 97.24W
05/12/2015  M6.50 INCH       REFUGIO            TX   TRAINED SPOTTER

0700 AM     HEAVY RAIN       5 N ROBSTOWN            27.87N 97.66W
05/12/2015  M6.00 INCH       SAN PATRICIO       TX   TRAINED SPOTTER

            MORE THAN 6 INCHES IN CALALLEN

0824 AM     TSTM WND GST     PORT LAVACA             28.61N 96.62W
05/12/2015  M58.00 MPH       CALHOUN            TX   CO-OP OBSERVER

            POWER OUT IN PORT LAVACA. GUST AT PORT LAVACA T-COON AT
            824 AM.

0824 AM     MARINE TSTM WIND 6 N MCFADDIN            28.64N 97.02W
05/12/2015  M58.00 MPH       VICTORIA           TX   MESONET

            PORT LAVACA GUST TO 50 KNOTS
Oso Creek at FM763 Oso Creek at Weber Oso Creek at South Staples Oso Creek at Crosstown Expressway Oso Creek at South Staples Oso Creek at Weber Oso Creek at South Staples Oso Creek at FM763 Oso Creek at FM763 FM2444 FM2444 FM2444 Corpus Christi Corpus Christi Corpus Christi Corpus Christi Corpus Christi Corpus Christi Corpus Christi Corpus Christi Corpus Christi Corpus Christi Corpus Christi Corpus Christi Corpus Christi Corpus Christi Corpus Christi Corpus Christi Corpus Christi Corpus Christi Corpus Christi Corpus Christi Corpus Christi Corpus Christi Corpus Christi Corpus Christi Corpus Christi Corpus Christi Aransas Pass Port Aransas Robstown Robstown Robstown Petronila Petronila Petronila Petronila
1-Day Observed Rainfall ending 7 AM May 12, 2015
250 MB - 00Z 05/12 300 MB - 00Z 05/12
500 MB - 00Z 05/12 700 MB - 00Z 05/12
850 MB - 00Z 05/12 925 MB - 00Z 05/12