Block, which capture water in aquifers underground. Designated ground water sub-basins include: Chino, Rialto-Colton, Riverside-Arlington, San Bernardino (Bunker Hill), Yucaipa and San Timoteo. The San Bernardino or Bunker Hill basin is bounded on the northeast by the San Bernardino Mountains, northwest by the San Gabriel Mountains, southwest by the San Timoteo badlands, and southeast by the Crafton Hills. The San Andreas Fault and San Jacinto Fault zones enter the valley along the San Bernardino Mountains and San Jacinto Mountains, respectively. The two fault lines converge to less than 10 km apart in the city of San Bernardino, and less than 3 km in the northwestern part of the basin near the Cajon Pass. Cities and communities Bloomington Chino Chino Hills Colton Devore Fontana Grand Terrace Highland Loma Linda Muscoy Oak Glen Ontario Rancho Cucamonga Redlands Rialto San Bernardino Yucaipa Climate The climate is Mediterranean with cool-to-cold, wet, and in some cases snowy winters, and dry, hot summers. Usually the areas north of Interstate 210 and east of Interstate 215 see colder weather in the winter with occasional snowfall. Sage scrub and the Yucca plant are the predominant natural vegetation along washes and uplands; it intergrades with chaparral at elevations of 600 to 700 meters. Other vegetation consists of a patchwork of grasslands, riparian woodlands, and mixed hardwood forests, which border the valley in the mountains on the north and east. The Santa Ana winds blow into the valley from the Cajon Pass, which exits the valley's north end between the San Gabriel and San Bernardino mountains. At times, the seasonal Santa Ana winds are felt particularly strongly in the San Bernardino area as warm and dry air is channeled through nearby Cajon Pass during the autumn months. This phenomenon markedly increases the wildfire danger in the foothill, canyon, and mountain communities, which the cycle of cold, wet winters and dry summers helps create. Local attractions The Route 66 Rendezvous in downtown San Bernardino attracts about half a million people annually from all over the world to watch California's largest classical car show. Although not in the valley, the San Bernardino Mountains attract a significant amount of tourism to the valley as people drive up to the local resorts, especially in the winter months. A famous ski resort in the area is Big Bear. Other famous mountain communities with large amounts of tourism include Lake Arrowhead, Big Bear Lake, and Crestline.