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Weather Alert
    Other Weather Alerts
Type Hydrologic Outlook
Issued By NWS Field Office
Issuing Time Wed, 15 Feb 2017 05:40:00 PST
Broadcast Time Wed, 15 Feb 2017 05:40:00 PST
Valid Until Sun, 19 Feb 2017 15:00:00 PST
Brief Description Hydrologic Outlook
Detailed Description A major storm system will affect Southwest California Thursday night through Saturday resulting in flooding concerns. Confidence is building for a significant 24-36 hour rainfall event for Southwest California beginning Thursday night through Saturday, bringing the potential for numerous hydrological impacts. The first in a series of storms is expected to bring light to moderate rainfall initially to San Luis Obispo and Santa Barbara Counties Thursday morning, before overspreading Ventura and Los Angeles Counties Thursday evening through the overnight hours. A second more powerful storm system will begin to intensify as it approaches Southern California as early as Friday morning. A long narrow band of subtropical moisture, otherwise known as an Atmospheric River will take aim at Southwestern California. Santa Barbara, Ventura and Los Angeles Counties should take the brunt of this powerful storm Friday morning through Saturday morning. Between 2 to 4 inches of rainfall is expected across coast and valleys, with between 4 to 8 inches across the Santa Ynez Range, as well as the Ventura and Los Angeles County Mountains. Most of San Luis Obispo County should receive 1 to 3 inches, with 2 to 5 inches in the coastal foothills. Rainfall rates are expected to reach one inch per hour. With this storm system expected to be slow in moving through the forecast area, there will be several potential hydrological impacts. The potential for widespread flooding and flash flooding is a definite threat. Not just for the recent burn areas, but anywhere there is the potential for flooding. The expected high rainfall amounts and intensities could bring numerous hydrological impacts. Many rivers and streams could see significant flows on Friday into Saturday. but main-stem river flooding is not expected at this time. There is a potential for swift water rescues due to the heavy rain and resulting increased flow rates. There will be the threat of flash flooding with mud and debris flows in and around the recent burn areas, especially with Friday`s storm. Also, widespread and significant urban and small stream flooding can be expected at times through Monday. Lastly rock and mudslides will be a significant threat during this period, especially across canyon roads. Models are indicating a few more weaker storm systems to move through the region into early next week. Any additional rainfall could continue to bring hydrological impacts. Watch for updates and possible watches and warnings at weather.gov/losangeles as we get closer to the event.
       
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Region Alert
Idaho Flood Warning (5)
California Flood Warning (7)
Nevada Flood Warning
Idaho Winter Weather Warning, Watch, or Advisory (7)
Arizona Winter Weather Warning, Watch, or Advisory (24)
New Mexico Winter Weather Warning, Watch, or Advisory (14)
Colorado Winter Weather Warning, Watch, or Advisory (8)
Utah Winter Weather Warning, Watch, or Advisory (6)
Wyoming Winter Weather Warning, Watch, or Advisory (7)
California Winter Weather Warning, Watch, or Advisory (12)
Oregon Winter Weather Warning, Watch, or Advisory (2)
Nevada Winter Weather Warning, Watch, or Advisory (2)
Alaska Winter Weather Warning, Watch, or Advisory (2)
Montana Winter Weather Warning, Watch, or Advisory (4)
Washington Winter Weather Warning, Watch, or Advisory (2)
California Coastal Flood Warning, Watch, or Statement (16)
Florida Coastal Flood Warning, Watch, or Statement (3)
Koror Palau Coastal Waters,Yap Coastal Waters Coastal Flood Warning, Watch, or Statement
Pohnpei Coastal Waters,Chuuk Coastal Waters Coastal Flood Warning, Watch, or Statement
Kosrae Coastal Waters Coastal Flood Warning, Watch, or Statement (2)
Koror Palau Coastal Waters,Yap Coastal Waters Coastal Flood Warning, Watch, or Statement
Pohnpei Coastal Waters,Chuuk Coastal Waters Coastal Flood Warning, Watch, or Statement
American Samoa Coastal Flood Warning, Watch, or Statement (2)
Hawaii Coastal Flood Warning, Watch, or Statement
Idaho Special Weather Statement
Coastal Florida Special Weather Statement (3)
Coastal Florida,Southeast Coast (Atlantic) from NC south; Puerto Rican Waters; Caribbean Sea; Southwest North Atlantic Special Weather Statement
Wyoming Special Weather Statement
California Snow Avalanche Bulletin
Nevada Snow Avalanche Bulletin
California Flash Flood Watch (20)
Arizona Flash Flood Watch
Nevada Flash Flood Watch (4)
Montana Flash Flood Watch
Idaho Flash Flood Watch
California Flood Statement (14)
Idaho Flood Statement (3)
Oregon Flood Statement (4)
Wyoming Flood Statement (4)
Nevada Flood Statement (4)
Oregon Non Precipitation Warning, Watch, or Statement (2)
Nevada Non Precipitation Warning, Watch, or Statement (4)
Wyoming Non Precipitation Warning, Watch, or Statement (3)
American Samoa Non Precipitation Warning, Watch, or Statement
California Non Precipitation Warning, Watch, or Statement (7)
Hawaii Non Precipitation Warning, Watch, or Statement
       
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