Zone Forecast Product
Issued by NWS Tucson, AZ
Issued by NWS Tucson, AZ
912 FPUS55 KTWC 240948 ZFPTWC Zone Forecast Product for Southeast Arizona National Weather Service Tucson AZ 246 AM MST Sun Aug 24 2025 AZZ501-250200- Western Pima County- Including Ajo and Organ Pipe Cactus N.M. 246 AM MST Sun Aug 24 2025 .TODAY...Mostly sunny in the morning, then partly cloudy with a 50 percent chance of showers and thunderstorms in the afternoon. Patchy blowing dust in the afternoon. Some thunderstorms may produce damaging winds in the afternoon. Highs 104 to 109. .TONIGHT...Patchy blowing dust in the evening. Mostly cloudy with chance of showers and thunderstorms in the evening, then partly cloudy with slight chance of showers and thunderstorms after midnight. Some thunderstorms may produce damaging winds in the evening. Lows 80 to 85. Chance of precipitation 30 percent. .MONDAY...Chance of showers and slight chance of thunderstorms in the morning, then showers and thunderstorms likely in the afternoon. Highs 98 to 103. Chance of precipitation 60 percent. .MONDAY NIGHT...Showers and thunderstorms likely. Lows 79 to 84. Chance of precipitation 70 percent. .TUESDAY...Showers likely and chance of thunderstorms. Highs 94 to 100. Chance of precipitation 70 percent. .TUESDAY NIGHT...Showers likely and chance of thunderstorms. Lows 76 to 81. Chance of precipitation 60 percent. .WEDNESDAY...Mostly cloudy with a 50 percent chance of showers and thunderstorms. Highs 94 to 100. .WEDNESDAY NIGHT...Partly cloudy with chance of showers and slight chance of thunderstorms. Lows 77 to 82. Chance of precipitation 40 percent. .THURSDAY...Partly cloudy with a 20 percent chance of showers and thunderstorms. Highs 97 to 102. .THURSDAY NIGHT...Partly cloudy with a 10 percent chance of showers and thunderstorms. Lows 77 to 82. .FRIDAY...Mostly sunny with a 10 percent chance of showers and thunderstorms. Highs 98 to 103. .FRIDAY NIGHT...Mostly clear. Lows 76 to 81. .SATURDAY...Mostly sunny with a 10 percent chance of showers and thunderstorms. Highs 99 to 104. $$ AZZ502-250200- Tohono O`odham Nation- Including Sells 246 AM MST Sun Aug 24 2025 .TODAY...Mostly sunny in the morning, then partly cloudy with a 30 percent chance of showers and thunderstorms in the afternoon. Patchy blowing dust in the afternoon. Some thunderstorms may produce damaging winds in the afternoon. Highs 101 to 106. .TONIGHT...Patchy blowing dust in the evening. Mostly cloudy with chance of showers and thunderstorms in the evening, then partly cloudy with slight chance of showers and thunderstorms after midnight. Some thunderstorms may produce damaging winds in the evening. Lows 76 to 81. Chance of precipitation 40 percent. .MONDAY...Partly cloudy with slight chance of showers and thunderstorms in the morning, then showers and thunderstorms likely in the afternoon. Highs 96 to 101. Chance of precipitation 60 percent. .MONDAY NIGHT...Thunderstorms with showers likely. Lows 74 to 79. .TUESDAY...Showers and chance of thunderstorms. Highs 90 to 95. .TUESDAY NIGHT...Showers and chance of thunderstorms. Lows 72 to 77. .WEDNESDAY...Mostly cloudy with a 50 percent chance of showers and thunderstorms. Highs 91 to 96. .WEDNESDAY NIGHT...Partly cloudy with a 40 percent chance of showers and thunderstorms. Lows 73 to 78. .THURSDAY...Partly cloudy with a 30 percent chance of showers and thunderstorms. Highs 93 to 98. .THURSDAY NIGHT...Partly cloudy with a 10 percent chance of showers and thunderstorms. Lows 72 to 77. .FRIDAY THROUGH SATURDAY...Mostly clear with a 10 percent chance of showers and thunderstorms. Highs 95 to 101. Lows 72 to 77. $$ AZZ503-250200- Upper Santa Cruz River Valley/Altar Valley- Including Nogales 246 AM MST Sun Aug 24 2025 .TODAY...Mostly sunny. A 10 percent chance of showers and thunderstorms in the afternoon. Highs 96 to 102. .TONIGHT...Partly cloudy with a 20 percent chance of showers and thunderstorms. Lows 66 to 72. .MONDAY...Partly cloudy with slight chance of showers and thunderstorms in the morning, then showers and thunderstorms likely in the afternoon. Highs 90 to 96. Chance of precipitation 60 percent. .MONDAY NIGHT...Showers and thunderstorms likely. Lows 66 to 71. Chance of precipitation 60 percent. .TUESDAY...Showers with thunderstorms likely. Highs 85 to 90. .TUESDAY NIGHT...Showers and chance of thunderstorms. Lows 64 to 69. .WEDNESDAY...Showers and thunderstorms likely. Highs 85 to 91. Chance of precipitation 60 percent. .WEDNESDAY NIGHT...Partly cloudy with a 40 percent chance of showers and thunderstorms. Lows 63 to 69. .THURSDAY...Partly cloudy with a 30 percent chance of showers and thunderstorms. Highs 86 to 92. .THURSDAY NIGHT...Partly cloudy with a 10 percent chance of showers and thunderstorms. Lows 64 to 69. .FRIDAY THROUGH SATURDAY...Partly cloudy with a 10 percent chance of showers and thunderstorms. Highs 88 to 95. Lows 63 to 69. $$ AZZ504-250200- Tucson Metro Area- Including Tucson, Green Valley, Marana, and Vail 246 AM MST Sun Aug 24 2025 ...EXTREME HEAT WARNING IN EFFECT UNTIL 8 PM MST THIS EVENING... .TODAY...Mostly sunny. A 10 percent chance of showers and thunderstorms in the afternoon. Highs 101 to 107. Southeast wind around 10 mph. .TONIGHT...Partly cloudy with a 20 percent chance of showers and thunderstorms. Lows 74 to 80. West wind 5 to 10 mph. .MONDAY...Partly cloudy in the morning, then mostly cloudy with a 40 percent chance of showers and thunderstorms in the afternoon. Highs 96 to 102. South wind around 10 mph becoming west in the afternoon. .MONDAY NIGHT...Thunderstorms likely and chance of showers. Lows 71 to 77. Southwest wind 5 to 15 mph. Chance of precipitation 60 percent. .TUESDAY...Showers likely and chance of thunderstorms. Highs 88 to 94. South wind around 10 mph becoming west in the afternoon. Chance of precipitation 70 percent. .TUESDAY NIGHT...Showers likely and chance of thunderstorms. Lows 69 to 75. Chance of precipitation 70 percent. .WEDNESDAY...Mostly cloudy with a 40 percent chance of showers and thunderstorms. Highs 88 to 94. .WEDNESDAY NIGHT...Partly cloudy with a 30 percent chance of showers and thunderstorms. Lows 69 to 75. .THURSDAY THROUGH SATURDAY...Partly cloudy with a 10 percent chance of showers and thunderstorms. Highs 90 to 99. Lows 68 to 75. $$ AZZ505-250200- South Central Pinal County- Including Picacho Peak State Park 246 AM MST Sun Aug 24 2025 ...EXTREME HEAT WARNING IN EFFECT UNTIL 8 PM MST THIS EVENING... .TODAY...Mostly sunny. A 10 percent chance of showers and thunderstorms in the afternoon. Highs 104 to 109. .TONIGHT...Partly cloudy with a 20 percent chance of showers and thunderstorms. Lows 77 to 82. .MONDAY...Partly cloudy in the morning, then mostly cloudy with a 30 percent chance of showers and thunderstorms in the afternoon. Highs 99 to 104. .MONDAY NIGHT...Showers and thunderstorms likely. Lows 74 to 79. Chance of precipitation 60 percent. .TUESDAY...Mostly cloudy with a 30 percent chance of showers and thunderstorms. Highs 90 to 95. .TUESDAY NIGHT...Showers likely and chance of thunderstorms. Lows 72 to 77. Chance of precipitation 70 percent. .WEDNESDAY...Mostly cloudy with a 40 percent chance of showers and thunderstorms. Highs 90 to 95. .WEDNESDAY NIGHT...Partly cloudy with a 30 percent chance of showers and thunderstorms. Lows 73 to 78. .THURSDAY...Mostly sunny with a 10 percent chance of showers and thunderstorms. Highs 92 to 97. .THURSDAY NIGHT AND FRIDAY...Mostly clear. A 10 percent chance of showers and thunderstorms. Lows 71 to 76. Highs 94 to 99. .FRIDAY NIGHT...Mostly clear. Lows 71 to 76. .SATURDAY...Mostly sunny with a 10 percent chance of showers and thunderstorms. Highs 95 to 100. $$ AZZ506-250200- Southeast Pinal County- Including Mammoth and Oracle 246 AM MST Sun Aug 24 2025 ...EXTREME HEAT WARNING IN EFFECT UNTIL 8 PM MST THIS EVENING... .TODAY...Mostly sunny. A 10 percent chance of showers and thunderstorms in the afternoon. Highs 100 to 106. .TONIGHT...Partly cloudy with a 20 percent chance of showers and thunderstorms. Lows 74 to 80. .MONDAY...Partly cloudy in the morning, then mostly cloudy with a 40 percent chance of showers and thunderstorms in the afternoon. Highs 96 to 102. .MONDAY NIGHT...Thunderstorms likely and chance of showers. Lows 72 to 77. Chance of precipitation 60 percent. .TUESDAY...Showers likely and chance of thunderstorms. Highs 89 to 95. Chance of precipitation 70 percent. .TUESDAY NIGHT...Showers likely and chance of thunderstorms. Lows 70 to 75. Chance of precipitation 70 percent. .WEDNESDAY...Mostly cloudy with a 40 percent chance of showers and thunderstorms. Highs 88 to 94. .WEDNESDAY NIGHT...Partly cloudy with a 30 percent chance of showers and thunderstorms. Lows 70 to 75. .THURSDAY...Partly cloudy with a 10 percent chance of showers and thunderstorms. Highs 90 to 96. .THURSDAY NIGHT...Mostly clear. Lows 70 to 75. .FRIDAY...Mostly sunny with a 10 percent chance of showers and thunderstorms. Highs 92 to 98. .FRIDAY NIGHT...Mostly clear. Lows 69 to 74. .SATURDAY...Mostly sunny with a 10 percent chance of showers and thunderstorms. Highs 93 to 99. $$ AZZ507-250200- Upper San Pedro River Valley- Including Sierra Vista and Benson 246 AM MST Sun Aug 24 2025 .TODAY...Mostly sunny. A 10 percent chance of showers and thunderstorms in the afternoon. Highs 94 to 100. .TONIGHT...Partly cloudy with a 10 percent chance of showers and thunderstorms. Lows 66 to 72. .MONDAY...Partly cloudy in the morning, then mostly cloudy with a 40 percent chance of showers and thunderstorms in the afternoon. Highs 91 to 97. .MONDAY NIGHT...Mostly cloudy with a 50 percent chance of showers and thunderstorms. Lows 66 to 71. .TUESDAY...Showers with thunderstorms likely. Highs 84 to 90. .TUESDAY NIGHT...Showers likely and chance of thunderstorms. Lows 63 to 69. Chance of precipitation 70 percent. .WEDNESDAY...Showers and thunderstorms likely. Highs 84 to 90. Chance of precipitation 60 percent. .WEDNESDAY NIGHT AND THURSDAY...Partly cloudy with a 30 percent chance of showers and thunderstorms. Lows 63 to 68. Highs 85 to 91. .THURSDAY NIGHT THROUGH FRIDAY NIGHT...Partly cloudy with a 10 percent chance of showers and thunderstorms. Lows 63 to 68. Highs 86 to 92. .SATURDAY...Partly cloudy with a 30 percent chance of showers and thunderstorms. Highs 88 to 94. $$ AZZ508-250200- Eastern Cochise County below 5000 feet- Including Willcox and Douglas 246 AM MST Sun Aug 24 2025 .TODAY...Mostly sunny. Highs 93 to 98. .TONIGHT...Partly cloudy. A 10 percent chance of showers and thunderstorms in the evening. Lows 66 to 71. .MONDAY...Partly cloudy. A 20 percent chance of showers and thunderstorms in the afternoon. Highs 92 to 97. .MONDAY NIGHT...Mostly cloudy with a 30 percent chance of showers and thunderstorms. Lows 65 to 70. .TUESDAY...Showers likely and chance of thunderstorms. Highs 88 to 93. Chance of precipitation 60 percent. .TUESDAY NIGHT...Showers likely and chance of thunderstorms. Lows 63 to 68. Chance of precipitation 70 percent. .WEDNESDAY...Thunderstorms likely and chance of showers. Highs 86 to 91. Chance of precipitation 60 percent. .WEDNESDAY NIGHT...Mostly cloudy with a 40 percent chance of showers and thunderstorms. Lows 62 to 67. .THURSDAY...Partly cloudy with a 30 percent chance of showers and thunderstorms. Highs 87 to 92. .THURSDAY NIGHT...Partly cloudy with a 20 percent chance of showers and thunderstorms. Lows 62 to 67. .FRIDAY...Partly cloudy with a 30 percent chance of showers and thunderstorms. Highs 87 to 92. .FRIDAY NIGHT...Partly cloudy with a 10 percent chance of showers and thunderstorms. Lows 62 to 67. .SATURDAY...Partly cloudy with a 30 percent chance of showers and thunderstorms. Highs 88 to 93. $$ AZZ509-250200- Upper Gila River Valley- Including Clifton and Safford 246 AM MST Sun Aug 24 2025 .TODAY...Mostly sunny. A 10 percent chance of showers and thunderstorms in the afternoon. Highs 93 to 101. .TONIGHT...Partly cloudy. A 10 percent chance of showers and thunderstorms in the evening. Lows 69 to 77. .MONDAY...Partly cloudy. A 30 percent chance of showers and thunderstorms in the afternoon. Highs 92 to 100. .MONDAY NIGHT...Mostly cloudy with a 30 percent chance of showers and thunderstorms. Lows 67 to 75. .TUESDAY...Mostly cloudy with a 40 percent chance of showers and thunderstorms. Highs 88 to 96. .TUESDAY NIGHT...Showers likely and chance of thunderstorms. Lows 64 to 72. Chance of precipitation 60 percent. .WEDNESDAY...Mostly cloudy with a 40 percent chance of showers and thunderstorms. Highs 85 to 93. .WEDNESDAY NIGHT...Mostly cloudy with a 40 percent chance of showers and thunderstorms. Lows 64 to 72. .THURSDAY AND THURSDAY NIGHT...Partly cloudy with a 10 percent chance of showers and thunderstorms. Highs 86 to 94. Lows 64 to 72. .FRIDAY AND FRIDAY NIGHT...Mostly clear. A 10 percent chance of showers and thunderstorms. Highs 87 to 95. Lows 63 to 71. .SATURDAY...Partly cloudy with a 10 percent chance of showers and thunderstorms. Highs 88 to 96. $$ AZZ510-250200- White Mountains of Graham and Greenlee Counties- Including Hannagan Meadow 246 AM MST Sun Aug 24 2025 .TODAY...Mostly sunny in the morning, then partly cloudy with a 30 percent chance of showers and thunderstorms in the afternoon. Some thunderstorms may produce damaging winds in the afternoon. Highs 81 to 91. .TONIGHT...Mostly cloudy. A 20 percent chance of showers and thunderstorms in the evening. Lows 59 to 71. .MONDAY...Partly cloudy in the morning, then mostly cloudy with a 40 percent chance of showers and thunderstorms in the afternoon. Highs 81 to 91. .MONDAY NIGHT...Mostly cloudy with a 50 percent chance of showers and thunderstorms. Lows 57 to 69. .TUESDAY...Showers likely and chance of thunderstorms. Highs 77 to 87. Chance of precipitation 60 percent. .TUESDAY NIGHT...Showers likely and chance of thunderstorms. Lows 56 to 66. Chance of precipitation 70 percent. .WEDNESDAY...Thunderstorms likely and chance of showers. Highs 73 to 83. Chance of precipitation 70 percent. .WEDNESDAY NIGHT...Mostly cloudy with a 40 percent chance of showers and thunderstorms. Lows 53 to 65. .THURSDAY...Partly cloudy with a 30 percent chance of showers and thunderstorms. Highs 75 to 85. .THURSDAY NIGHT...Partly cloudy. Lows 53 to 65. .FRIDAY...Partly cloudy with a 30 percent chance of showers and thunderstorms. Highs 76 to 86. .FRIDAY NIGHT...Mostly clear with a 10 percent chance of showers and thunderstorms. Lows 53 to 65. .SATURDAY...Partly cloudy with a 30 percent chance of showers and thunderstorms. Highs 77 to 87. $$ AZZ511-250200- Galiuro and Pinaleno Mountains- Including Mount Graham 246 AM MST Sun Aug 24 2025 .TODAY...Mostly sunny. A 10 percent chance of showers and thunderstorms in the afternoon. Highs 82 to 94. .TONIGHT...Partly cloudy. A 10 percent chance of showers and thunderstorms in the evening. Lows 64 to 72. .MONDAY...Partly cloudy in the morning, then mostly cloudy with a 30 percent chance of showers and thunderstorms in the afternoon. Highs 81 to 91. .MONDAY NIGHT...Thunderstorms likely and chance of showers. Lows 62 to 68. Chance of precipitation 60 percent. .TUESDAY...Showers likely and chance of thunderstorms. Highs 75 to 85. Chance of precipitation 70 percent. .TUESDAY NIGHT...Showers and chance of thunderstorms. Lows 60 to 66. .WEDNESDAY...Showers and thunderstorms likely. Highs 73 to 83. Chance of precipitation 60 percent. .WEDNESDAY NIGHT...Partly cloudy with a 40 percent chance of showers and thunderstorms. Lows 60 to 66. .THURSDAY...Partly cloudy with a 30 percent chance of showers and thunderstorms. Highs 75 to 85. .THURSDAY NIGHT AND FRIDAY...Partly cloudy with a 20 percent chance of showers and thunderstorms. Lows 60 to 66. Highs 76 to 86. .FRIDAY NIGHT...Mostly clear with a 10 percent chance of showers and thunderstorms. Lows 60 to 66. .SATURDAY...Partly cloudy with a 10 percent chance of showers and thunderstorms. Highs 77 to 87. $$ AZZ512-250200- Chiricahua Mountains- Including Chiricahua NM 246 AM MST Sun Aug 24 2025 .TODAY...Mostly sunny. Highs 82 to 92. .TONIGHT...Partly cloudy. Lows 61 to 69. .MONDAY...Partly cloudy. A 20 percent chance of showers and thunderstorms in the afternoon. Highs 82 to 92. .MONDAY NIGHT...Mostly cloudy with a 30 percent chance of showers and thunderstorms. Lows 60 to 66. .TUESDAY...Showers likely and chance of thunderstorms. Highs 77 to 87. Chance of precipitation 60 percent. .TUESDAY NIGHT...Showers likely and chance of thunderstorms. Lows 58 to 64. Chance of precipitation 70 percent. .WEDNESDAY...Showers and thunderstorms likely. Highs 75 to 85. Chance of precipitation 70 percent. .WEDNESDAY NIGHT...Mostly cloudy with a 40 percent chance of showers and thunderstorms. Lows 58 to 64. .THURSDAY...Partly cloudy with a 40 percent chance of showers and thunderstorms. Highs 77 to 85. .THURSDAY NIGHT...Partly cloudy with a 20 percent chance of showers and thunderstorms. Lows 58 to 64. .FRIDAY...Partly cloudy with a 30 percent chance of showers and thunderstorms. Highs 77 to 87. .FRIDAY NIGHT...Partly cloudy with a 10 percent chance of showers and thunderstorms. Lows 58 to 64. .SATURDAY...Partly cloudy with a 40 percent chance of showers and thunderstorms. Highs 78 to 88. $$ AZZ513-250200- Dragoon and Mule and Huachuca and Santa Rita Mountains- Including Bisbee, Canelo Hills, and Madera Canyon 246 AM MST Sun Aug 24 2025 .TODAY...Mostly sunny. A 10 percent chance of showers and thunderstorms in the afternoon. Highs 87 to 95. .TONIGHT...Mostly clear with a 10 percent chance of showers and thunderstorms. Lows 63 to 68. .MONDAY...Partly cloudy in the morning, then mostly cloudy with a 50 percent chance of showers and thunderstorms in the afternoon. Highs 84 to 92. .MONDAY NIGHT...Thunderstorms likely and chance of showers. Lows 62 to 67. Chance of precipitation 60 percent. .TUESDAY...Showers with thunderstorms likely. Highs 77 to 85. .TUESDAY NIGHT...Showers likely and chance of thunderstorms. Lows 60 to 65. Chance of precipitation 70 percent. .WEDNESDAY...Showers and thunderstorms likely. Highs 77 to 85. Chance of precipitation 60 percent. .WEDNESDAY NIGHT...Partly cloudy with a 40 percent chance of showers and thunderstorms. Lows 60 to 65. .THURSDAY...Partly cloudy with a 30 percent chance of showers and thunderstorms. Highs 78 to 86. .THURSDAY NIGHT...Partly cloudy with a 20 percent chance of showers and thunderstorms. Lows 60 to 65. .FRIDAY...Partly cloudy with a 30 percent chance of showers and thunderstorms. Highs 80 to 88. .FRIDAY NIGHT...Partly cloudy with a 10 percent chance of showers and thunderstorms. Lows 60 to 65. .SATURDAY...Partly cloudy with a 30 percent chance of showers and thunderstorms. Highs 81 to 89. $$ AZZ514-250200- Catalina and Rincon Mountains- Including Mount Lemmon and Summerhaven 246 AM MST Sun Aug 24 2025 .TODAY...Mostly sunny. A 10 percent chance of showers and thunderstorms in the afternoon. Highs 83 to 93. .TONIGHT...Partly cloudy with a 10 percent chance of showers and thunderstorms. Lows 64 to 72. .MONDAY...Partly cloudy in the morning, then mostly cloudy with a 40 percent chance of showers and thunderstorms in the afternoon. Highs 79 to 89. .MONDAY NIGHT...Thunderstorms likely and chance of showers. Lows 61 to 69. Chance of precipitation 60 percent. .TUESDAY...Showers and chance of thunderstorms. Highs 73 to 83. .TUESDAY NIGHT...Showers likely and chance of thunderstorms. Lows 60 to 68. Chance of precipitation 70 percent. .WEDNESDAY...Showers and thunderstorms likely. Highs 72 to 82. Chance of precipitation 60 percent. .WEDNESDAY NIGHT AND THURSDAY...Partly cloudy with a 30 percent chance of showers and thunderstorms. Lows 60 to 68. Highs 73 to 83. .THURSDAY NIGHT...Mostly clear with a 10 percent chance of showers and thunderstorms. Lows 60 to 68. .FRIDAY...Partly cloudy with a 10 percent chance of showers and thunderstorms. Highs 75 to 85. .FRIDAY NIGHT...Mostly clear. Lows 60 to 68. .SATURDAY...Partly cloudy with a 10 percent chance of showers and thunderstorms. Highs 76 to 86. $$ AZZ515-250200- Baboquivari Mountains- Including Kitt Peak 246 AM MST Sun Aug 24 2025 .TODAY...Mostly sunny in the morning, then partly cloudy with a 20 percent chance of showers and thunderstorms in the afternoon. Highs 90 to 96. .TONIGHT...Mostly cloudy with chance of showers and thunderstorms in the evening, then partly cloudy with slight chance of showers and thunderstorms after midnight. Lows 68 to 73. Chance of precipitation 30 percent. .MONDAY...Partly cloudy with slight chance of showers and thunderstorms in the morning, then showers and thunderstorms likely in the afternoon. Highs 84 to 90. Chance of precipitation 70 percent. .MONDAY NIGHT...Showers and thunderstorms. Lows 66 to 71. .TUESDAY...Showers with thunderstorms likely. Highs 78 to 84. .TUESDAY NIGHT...Showers and chance of thunderstorms. Lows 65 to 70. .WEDNESDAY...Showers likely and chance of thunderstorms. Highs 79 to 85. Chance of precipitation 60 percent. .WEDNESDAY NIGHT...Partly cloudy with a 40 percent chance of showers and thunderstorms. Lows 65 to 70. .THURSDAY...Partly cloudy with a 30 percent chance of showers and thunderstorms. Highs 81 to 87. .THURSDAY NIGHT...Partly cloudy with a 10 percent chance of showers and thunderstorms. Lows 65 to 70. .FRIDAY THROUGH SATURDAY...Partly cloudy with a 10 percent chance of showers and thunderstorms. Highs 83 to 90. Lows 66 to 71. $$ Visit us on Facebook...Twitter...YouTube...and at weather.gov/Tucson