On the heals of the Friday April 16th system, another upper trough approached the Rio Grande Valley Friday night within a stronger wind flow aloft.  Moisture levels were slightly lower early Saturday but the large scale lift with the approaching disturbance and cooler air aloft allowed for showers to develop after midnight Friday night across interior sections of South Texas.  The rain became locally heavy, again, on the west side of Choke Canyon Reservoir.  Localized rainfall amounts of 3 to 6 inches occurred bringing 2 day totals of 12 to 18 inches.  Partial sunshine allowed for sufficient heating across the Coastal Bend on the morning of the 17th and low level speed convergence was present early in the morning.  Instability values peaked on Saturday with surface-based CAPE of 2500 to 3000 J/KG.  A weak surface boundary reflection of the upper level trough axis entered the Coastal Plains by early afternoon and thunderstorms became numerous.  At the same time a weak sea breeze shifted slightly inland over the western portions of Kleberg and Nueces Counties.  Increased upper level winds shifted from west to northwest with the arrival of a stronger upper level trough helped organize the thunderstorms which had developed in the very unstable air mass.  By mid afternoon, a line of thunderstorms slowly moved through Jim Wells and Kleberg Counties producing a quick 2 to 5 inches of rain, significant cloud to ground lightning, and a weak EF-0 tornado on the King Ranch.  The heavy rain resulted in additional flooding to parts of Jim Wells County which had already received significant rainfall during the week.

Tornado in KLEBERG, TEXAS
From 17-APR-10 16:15:00 to 17-APR-10 16:16:00 (CST-6)
Location: KINGSVILLE ARPT
Tornado F-scale: EF0
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported a tornado touched down on the King Ranch, south of Hwy 141 and roughly 4 miles west of the main entrance to the ranch.  The tornado was on the ground for roughly 1/2 mile as it moved south, producing EF-0 damage.  Minor damage of roofing tin along with twisted mesquite trees were reported by the King Ranch.  Winds were estimated between 70 and 80 mph.

Flash Flood in NUECES, TEXAS
From 17-APR-10 15:00:00 to 17-APR-10 15:30:00 (CST-6)
Location: LA ROSE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

CoCoRaHS observer reported 2.73 inches of rain fell in only 45 minutes.  Water was reported flowing over the road at FM 666 and FM 3088.

Funnel Cloud in NUECES, TEXAS
From 17-APR-10 15:09:00 to 17-APR-10 15:09:00 (CST-6)
Location: PALO ALTO
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Spotter reported a wall clouds and funnel cloud 10 miles northwest of Bishop.

Flash Flood in JIM WELLS, TEXAS
From 17-APR-10 16:30:00 to 17-APR-10 17:30:00 (CST-6)
Location: (ALI)ALICE INTL ARPT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

FM 1930 flooded in 3 places, with up to 1 foot of water flowing over the road.

Hail in NUECES, TEXAS
From 17-APR-10 14:58:00 to 17-APR-10 14:58:00 (CST-6)
Location: AGUA DULCE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Pea to nickle sized hail fell at the intersection of FM 70 and FM 665.

Funnel Cloud in NUECES, TEXAS
From 17-APR-10 14:39:00 to 17-APR-10 14:39:00 (CST-6)
Location: PALO ALTO
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A rotating wall cloud produced a short lived funnel cloud near FM 665 and FM 666.

Flash Flood in LIVE OAK, TEXAS
From 17-APR-10 13:34:00 to 17-APR-10 15:30:00 (CST-6)
Location: SIMMONS
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Flowing water once again covering the road at Hwy 72 near the prison.

Flash Flood in MCMULLEN, TEXAS
From 17-APR-10 07:50:00 to 17-APR-10 09:45:00 (CST-6)
Location: CALLIHAM
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Flowing water was reported over Hwy 72 at Park Road 8, south of Calliham, and also along Hwy 72 near the prison entrance.