Weather Alerts for California

29. Flood Watch for: Northern Sacramento Valley; Central Sacramento Valley; Southern Sacramento Valley; Carquinez Strait and Delta; Northern San Joaquin Valley; Northeast Foothills/Sacramento Valley; Motherlode; Western Plumas County/Lassen Park; West Slope Northern Sierra Nevada

30. Flood Watch for: Shasta Lake Area / Northern Shasta County; Mountains Southwestern Shasta County to Western Colusa County

31. Frost Advisory for: North Bay Interior Valleys

32. High Wind Warning for: San Luis Obispo County Interior Valleys; San Luis Obispo County Mountains; Santa Barbara County Interior Mountains; Northern Ventura County Mountains

33. High Wind Warning for: Santa Lucia Mountains

34. Wind Advisory for: Cuyama Valley; Southern Ventura County Mountains

35. Wind Advisory for: Interstate 5 Corridor

36. Wind Advisory for: Northern Sacramento Valley; Central Sacramento Valley; Southern Sacramento Valley; Carquinez Strait and Delta; Northern San Joaquin Valley; Northeast Foothills/Sacramento Valley; Motherlode

37. Wind Advisory for: San Francisco Bay Shoreline; San Francisco Peninsula Coast; East Bay Interior Valleys; Santa Cruz Mountains; Santa Clara Valley Including San Jose; Eastern Santa Clara Hills; East Bay Hills; Southern Salinas Valley/Arroyo Seco and Lake San Antonio; Santa Lucia Mountains and Los Padres National Forest; Mountains Of San Benito County And Interior Monterey County Including Pinnacles National Park; Northern Salinas Valley/Hollister Valley and Carmel Valley; Northern Monterey Bay; Southern Monterey Bay and Big Sur Coast

38. Wind Advisory for: San Luis Obispo County Beaches; San Luis Obispo County Inland Central Coast; Southern Salinas Valley; Santa Barbara County Central Coast Beaches; Santa Barbara County Inland Central Coast

39. Wind Advisory for: Santa Ynez Valley; Santa Barbara County Southwestern Coast; Santa Barbara County Southeastern Coast; Santa Ynez Mountains Western Range; Santa Ynez Mountains Eastern Range; Western Santa Monica Mountains Recreational Area; Eastern Santa Monica Mountains Recreational Area

40. Wind Advisory for: Western San Gabriel Mountains and Highway 14 Corridor; Eastern San Gabriel Mountains; Western Antelope Valley Foothills; Eastern Antelope Valley Foothills

41. Winter Storm Warning for: Eastern Sierra Slopes of Inyo County

42. Winter Storm Warning for: Greater Lake Tahoe Area; Greater Lake Tahoe Area

43. Winter Storm Warning for: Lassen-Eastern Plumas-Eastern Sierra Counties

44. Winter Storm Warning for: Modoc County

45. Winter Storm Warning for: Mono

46. Winter Storm Warning for: North Central and Southeast Siskiyou County; Northeast Siskiyou and Northwest Modoc Counties; Klamath Basin; Northern and Eastern Klamath County and Western Lake County; Central and Eastern Lake County

47. Winter Storm Warning for: South Central Siskiyou County

48. Winter Storm Warning for: West Slope Northern Sierra Nevada

49. Winter Storm Warning for: Western Plumas County/Lassen Park

50. Winter Storm Warning for: Western Siskiyou County

51. Winter Storm Warning for: Yosemite NP outside of the valley; Upper San Joaquin River; Kaiser to Rodgers Ridge; Kings Canyon NP; Sequoia NP; South End of the Upper Sierra

52. Winter Storm Watch for: Greater Lake Tahoe Area; Greater Lake Tahoe Area

53. Winter Storm Watch for: Lassen-Eastern Plumas-Eastern Sierra Counties

54. Winter Storm Watch for: Mono

55. Winter Weather Advisory for: Coastal Del Norte

56. Winter Weather Advisory for: Del Norte Interior

57. Winter Weather Advisory for: Northern Humboldt Interior; Southern Humboldt Interior

58. Winter Weather Advisory for: Northern Trinity; Southern Trinity

59. Winter Weather Advisory for: Shasta Lake Area / Northern Shasta County; Burney Basin / Eastern Shasta County; Mountains Southwestern Shasta County to Western Colusa County

60. Winter Weather Advisory for: Southwestern Humboldt

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Weather Topic: What are Hole Punch Clouds?

Home - Education - Cloud Types - Hole Punch Clouds

Hole Punch Clouds Next Topic: Mammatus Clouds

A hole punch cloud is an unusual occurrence when a disk-shaped hole appears in a cirrostratus, cirrocumulus, or altocumulus cloud.

When part of the cloud forms ice crystals, water droplets in the surrounding area of the cloud evaporate. The effect of this process produces a large elliptical gap in the cloud. The hole punch cloud formation is rare, but it is not specific to any geographic area.

Other names which have been used to describe this phenomena include fallstreak hole, skypunch, and cloud hole.

Next Topic: Mammatus Clouds

Weather Topic: What are Nimbostratus Clouds?

Home - Education - Cloud Types - Nimbostratus Clouds

Nimbostratus Clouds Next Topic: Precipitation

A nimbostratus cloud is similar to a stratus cloud in its formless, smooth appearance. However, a nimbostratus cloud is darker than a stratus cloud, because it is thicker.

Unlike a stratus cloud, a nimbostratus cloud typically brings with it the threat of moderate to heavy precipitation. In some cases, the precipitation may evaporate before reaching the ground, a phenomenon known as virga.

Next Topic: Precipitation