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Climate Change Assessment for Water Resources Region 03 South Atlantic -Gulf Figure 2.4. Annual maximum, average, and minimum historical air temperatures, 1940 — 2010, Coweeta Laboratory, North Carolina. (Laseter et al., 2012). Key point: 1'her e hers been an apparent war thing in the region since the 1970,5. 1'he overall trend since the early 1900s, however, is unclean. 2.2. Precipitation Palecki et al. (2005) examined historical precipitation data from across the continental United States. They quantified trends in precipitation for the period 1972 — 2002 using NCDC 15- minute rainfall data. For the South Atlantic -Gulf Region, statistically significant increases in winter storm intensity (mm per hour) and fall storm totals were identified for the southernmost portion of South Atlantic -Gulf Region. Additionally, a statistically significant decrease in summer storm intensity was identified for the northern portion of the area. Multiple authors have identified significant increasing trends in total annual precipitation in recent historical records for the study region. Grundstein (2009) presented little evidence of significant trends (1895 — 2006) in either annual precipitation or soil moisture for the majority of the area (Figure 2.5), except for Alabama. Soil moisture is a function of both supply (precipitation) and demand (evapo- transpiration [ET]), and therefore is an effective proxy for both precipitation and ET. A number of sites in Alabama (southwest portion of the HUC) exhibit significant increasing trends in both annual precipitation and soil moisture over the past century. USACE Institute for Water Resources 11 January 9, 2015 s a Flu x ili ;'? 119,%:1 ('101** 113�WllKSi „r,01 9 South Atlantic -Gulf Figure 2.4. Annual maximum, average, and minimum historical air temperatures, 1940 — 2010, Coweeta Laboratory, North Carolina. (Laseter et al., 2012). Key point: 1'her e hers been an apparent war thing in the region since the 1970,5. 1'he overall trend since the early 1900s, however, is unclean. 2.2. Precipitation Palecki et al. (2005) examined historical precipitation data from across the continental United States. They quantified trends in precipitation for the period 1972 — 2002 using NCDC 15- minute rainfall data. For the South Atlantic -Gulf Region, statistically significant increases in winter storm intensity (mm per hour) and fall storm totals were identified for the southernmost portion of South Atlantic -Gulf Region. Additionally, a statistically significant decrease in summer storm intensity was identified for the northern portion of the area. Multiple authors have identified significant increasing trends in total annual precipitation in recent historical records for the study region. Grundstein (2009) presented little evidence of significant trends (1895 — 2006) in either annual precipitation or soil moisture for the majority of the area (Figure 2.5), except for Alabama. Soil moisture is a function of both supply (precipitation) and demand (evapo- transpiration [ET]), and therefore is an effective proxy for both precipitation and ET. A number of sites in Alabama (southwest portion of the HUC) exhibit significant increasing trends in both annual precipitation and soil moisture over the past century. USACE Institute for Water Resources 11 January 9, 2015