The combination of abundant low level moisture and a series of upper level disturbances moving across northern Mexico and Deep South Texas allowed for beneficial rains across the region. Areas of showers and thunderstorms affected the area from late on the 10th through the 15th. Rain activity ended as the upper level low pressure system tracked northeast, allowing drier air to filter into south Texas. Much of the area received rainfall amounts of 1 to 2 inches during the period, with heavier amounts of 2 to 4 inches occurring over portions of Zapata, Jim Hogg, coastal Kenedy and coastal Willacy counties. This rain provided much needed relief to ongoing Extreme to Exceptional drought conditions. Despite the rains, drought conditions improved only slightly. Drought conditions across Zapata and Jim Hogg counties were lessened one category from extreme to severe. Extreme Drought conditions extended across much of Starr, Brooks, Willacy, southeastern Hidalgo and Cameron counties. Exceptional drought continues across much of Hidalgo and Kenedy counties.

Drought in JIM HOGG, TEXAS
From 14-MAY-13 00:00:00 to 27-MAY-13 23:59:00 (CST-6)
Property damage: 0.00K
Reported by: Drought Monitor

Beneficial rainfall during the middle of May allowed for drought conditions to begin to improve across Jim Hogg County. The county became split between Extreme (D3)
Drought conditions and Severe (D2) Drought conditions. The western two thirds of county improved to Severe (D2) Drought conditions and the eastern third was in Extreme (D3) Drought conditions.

Drought in STARR, TEXAS
From 14-MAY-13 00:00:00 to 27-MAY-13 23:59:00 (CST-6)
Property damage: 0.00K
Reported by: Drought Monitor

Beneficial rainfall during the middle of May allowed for drought conditions to begin to improve across Starr County. By the 14th of May, drought conditions improved across much of Starr County.  Most of the county saw improvement to Extreme (D3) Drought conditions from Exceptional (D4) conditions, except for the southeast corner which remained in Exceptional (D4) Drought conditions and an area along the far western boundary which improved to Severe (D2) Drought conditions.
By the 21st, the county was effectively split into thirds. The northwestern third of the county experienced Severe (D2) Drought conditions, the middle third Extreme (D3) Drought conditions, and the southeastern third Exceptional (D4) Drought conditions.

Drought in WILLACY, TEXAS
From 14-MAY-13 00:00:00 to 31-MAY-13 23:59:00 (CST-6)
Property damage: 0.00K
Reported by: Drought Monitor

Beneficial rainfall during the middle of May allowed for drought conditions to begin to improve across Willacy County with improvements noticeable by the 14th of the month.  The vast majority of the county had improved to Extreme (D3) Drought conditions from Exceptional (D4) Drought conditions, except for the northwest corner of the county which remained in Exceptional (D4) Drought conditions. By the end of the month, all of Willacy County was in Extreme (D3) Drought conditions.

Drought in ZAPATA, TEXAS
From 14-MAY-13 00:00:00 to 27-MAY-13 23:59:00 (CST-6)
Property damage: 0.00K
Reported by: Drought Monitor

Beneficial rainfall during the middle of May allowed for drought conditions to begin to improve across Zapata County. Mid month totals were averaging 200 to 400 percent of normal; by the 14th of the month, the entire county improved from Extreme (D3) and Exceptional (D4) drought conditions to Severe (D2) drought conditions.

Drought in CAMERON, TEXAS
From 14-MAY-13 00:00:00 to 31-MAY-13 23:59:00 (CST-6)
Property damage: 0.00K
Reported by: Drought Monitor

Beneficial rainfall during the middle of May allowed for drought conditions to begin to improve. By the 14th of May, Cameron County began to see the improvements with the entire county immersed in extreme (D3) drought conditions.

Drought in COASTAL CAMERON, TEXAS
From 14-MAY-13 00:00:00 to 31-MAY-13 23:59:00 (CST-6)
Property damage: 0.00K
Reported by: Drought Monitor

Beneficial rainfall during the middle of May allowed for drought conditions to begin to improve. By May 14th, drought conditions had improved across the northern half of coastal Cameron County, where exceptional (D4) drought conditions improved to extreme (D3) drought conditions, resulting in all of coastal Cameron County in extreme (D3) drought conditions.

Drought in COASTAL WILLACY, TEXAS
From 14-MAY-13 00:00:00 to 31-MAY-13 23:59:00 (CST-6)
Property damage: 0.00K
Reported by: Drought Monitor

Beneficial rainfall during the middle of May allowed for drought conditions to begin to improve. By the middle of May, drought conditions began to improve across coastal Willacy County, with all of the area improving to extreme (D3) drought conditions from exceptional (D4) drought conditions.