Alert archive / California / Flash Flood Watches in 2021
Flash Flood Watch 3, NWS Sacramento, CA
NWS Sacramento, CA issued this flash flood watch at Oct 20, 2021, 11:31 AM PDT. It took effect at Oct 21, 2021, 5:00 PM PDT. It was in force for 18 hr.
The area
The counties it named.
The facts
- Issued
- Oct 20, 2021, 11:31 AM PDT (18:31 UTC)
- In effect from
- Oct 21, 2021, 5:00 PM PDT
- Expired
- Oct 22, 2021, 11:00 AM PDT
- In force
- 18 hr
- Issued by
- NWS Sacramento, CA
- Flood severity
- None
The text
As transmitted.
030 WGUS66 KSTO 201831 FFASTO URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Sacramento CA 1131 AM PDT Wed Oct 20 2021 .An intense band of precipitation will move through late Thursday evening through Friday morning. Periods of moderate to heavy rain are expected, especially Friday morning. These could bring potential ash and debris flows over the Dixie and North Complex burn scar areas. Snow levels will be high. CAZ014-211230- /O.NEW.KSTO.FF.A.0003.211022T0600Z-211022T1800Z/ /00000.0.BS.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Burney Basin / Eastern Shasta County- Including the cities of Burney 1131 AM PDT Wed Oct 20 2021 ...FLASH FLOOD/DEBRIS FLOW WATCH IN EFFECT FROM THURSDAY EVENING THROUGH FRIDAY MORNING FOR THE DIXIE BURN SCAR... The National Weather Service in Sacramento has issued a * Flash Flood Watch for the Dixie burn scar in a portion of northern California, including the following area, Burney Basin / Eastern Shasta County. * From Thursday evening through Friday morning. * Periods of heavy rainfall are forecasted over the Dixie, which may lead to flash flooding and debris flows. * Areas impacted include Highway 70 and Greenville PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. Local emergency services are monitoring the situation and will issue a public statement as conditions warrant. PLAN NOW so you will know what to do in an emergency. Keep informed by listening to local radio and television for statements and possible warnings. Follow the advice of public safety officials. && $$ CAZ066-068-211230- /O.NEW.KSTO.FF.A.0003.211022T0600Z-211022T1800Z/ /00000.0.BS.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Northeast Foothills/Sacramento Valley-Western Plumas County/Lassen Park- Including the cities of Quincy, Chester, and Paradise 1131 AM PDT Wed Oct 20 2021 ...FLASH FLOOD/DEBRIS FLOW WATCH IN EFFECT FROM LATE THURSDAY EVENING THROUGH FRIDAY MORNING FOR THE BUTTE AND PLUMAS COUNTY PORTION OF THE BEAR AND CLAREMONT FIRES IN THE NORTH COMPLEX BURN SCAR... The National Weather Service in Sacramento has issued a * Flash Flood Watch for the Butte and Plumas County portion of the Bear and Claremont Fires in the North Complex Burn Scar in northern California. * From Thursday evening through Friday morning. * Periods of heavy rainfall are forecasted over the Bear and Claremont Fires in the North Complex Burn Scar, which may lead to flash flooding and debris flows. * Areas impacted include the Berry Creek area, Feather Falls area and Highway 162 south toward Oroville Highway 70 and Highway 89 Quincy LaPorte Road PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. Local emergency services are monitoring the situation and will issue a public statement as conditions warrant. PLAN NOW so you will know what to do in an emergency. Keep informed by listening to local radio and television for statements and possible warnings. Follow the advice of public safety officials. && $$ EK
6 follow-up statements
837 WGUS66 KSTO 211031 FFASTO URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Sacramento CA 331 AM PDT Thu Oct 21 2021 .An intense band of precipitation will move through late Thursday evening through Friday morning. Periods of moderate to heavy rain are expected, especially Friday morning. These could bring potential ash and debris flows over recent burn scar areas in Shasta, Tehama, Butte and Plumas counties. Potential rainfall rates will be over a half inch per hour this evening. Snow levels will be high. CAZ013-220015- /O.EXB.KSTO.FF.A.0003.211022T0000Z-211022T1500Z/ /00000.0.BS.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Shasta Lake Area / Northern Shasta County- Including the cities of Shasta Dam 331 AM PDT Thu Oct 21 2021 ...FLASH FLOOD/DEBRIS FLOW WATCH IN EFFECT FROM THIS AFTERNOON THROUGH FRIDAY MORNING FOR THE SHASTA COUNTY PORTION OF THE CARR-DELTA-HIRZ BURN SCAR... The National Weather Service in Sacramento has expanded the * Flash Flood Watch to include a portion of northern California, including the following area, Shasta Lake Area / Northern Shasta County. * From this afternoon through Friday morning. * Periods of heavy rainfall are forecasted over the Carr-Delta-Hirz Burn Scar, which may lead to flash flooding and debris flows. * Areas impacted include Highway 299 from Redding to Buckhorn Summit, Trinity Mountain Road, French Gulch and the Whiskeytown National Recreation Area. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. Local emergency services are monitoring the situation and will issue a public statement as conditions warrant. PLAN NOW so you will know what to do in an emergency. Keep informed by listening to local radio and television for statements and possible warnings. Follow the advice of public safety officials. && $$ CAZ015-063-220015- /O.EXB.KSTO.FF.A.0003.211022T0000Z-211022T1500Z/ /00000.0.BS.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Northern Sacramento Valley-Mountains Southwestern Shasta County to Western Colusa County- Including the cities of Redding, Red Bluff, and Alder Springs 331 AM PDT Thu Oct 21 2021 ...FLASH FLOOD/DEBRIS FLOW WATCH IN EFFECT FROM THIS AFTERNOON THROUGH FRIDAY MORNING FOR THE SHASTA COUNTY PORTION OF THE ZOGG BURN SCAR... The National Weather Service in Sacramento has expanded the * Flash Flood Watch to include a portion of northern California, including the following areas, Mountains Southwestern Shasta County to Western Colusa County and Northern Sacramento Valley. * From this afternoon through Friday morning. * Periods of heavy rainfall are forecasted over the Zogg Burn Scar, which may lead to flash flooding and debris flows. * Areas impacted include Platina Road, Zogg Mine Road, Archer Road, and Bender Road. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. Local emergency services are monitoring the situation and will issue a public statement as conditions warrant. PLAN NOW so you will know what to do in an emergency. Keep informed by listening to local radio and television for statements and possible warnings. Follow the advice of public safety officials. && $$ CAZ014-220015- /O.CON.KSTO.FF.A.0003.211022T0600Z-211022T1800Z/ /00000.0.BS.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Burney Basin / Eastern Shasta County- Including the cities of Burney 331 AM PDT Thu Oct 21 2021 ...FLASH FLOOD/DEBRIS FLOW WATCH REMAINS IN EFFECT FROM THIS EVENING THROUGH FRIDAY MORNING FOR THE DIXIE WEST BURN SCAR... The Flash Flood Watch continues for * The Dixie burn scar in a portion of northern California, including the following area, Burney Basin / Eastern Shasta County. * From this evening through Friday morning. * Periods of heavy rainfall are forecasted over the Dixie West, which may lead to flash flooding and debris flows. * Areas impacted include Highway 70 and Greenville. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. Local emergency services are monitoring the situation and will issue a public statement as conditions warrant. PLAN NOW so you will know what to do in an emergency. Keep informed by listening to local radio and television for statements and possible warnings. Follow the advice of public safety officials. && $$ CAZ066-068-220015- /O.CON.KSTO.FF.A.0003.211022T0600Z-211022T1800Z/ /00000.0.BS.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Northeast Foothills/Sacramento Valley-Western Plumas County/Lassen Park- Including the cities of Quincy, Chester, and Paradise 331 AM PDT Thu Oct 21 2021 ...FLASH FLOOD/DEBRIS FLOW WATCH REMAINS IN EFFECT FROM THIS EVENING THROUGH FRIDAY MORNING FOR THE BUTTE AND PLUMAS COUNTY PORTION OF THE BEAR AND CLAREMONT FIRES IN THE NORTH COMPLEX BURN SCAR... The Flash Flood Watch continues for * The Butte and Plumas County portion of the Bear and Claremont Fires in the North Complex Burn Scar in northern California. * From this evening through Friday morning. * Periods of heavy rainfall are forecasted over the Bear and Claremont Fires in the North Complex Burn Scar, which may lead to flash flooding and debris flows. * Areas impacted include the Berry Creek area, Feather Falls area and Highway 162 south toward Oroville, Highway 70 and Highway 89 Quincy LaPorte Road PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. Local emergency services are monitoring the situation and will issue a public statement as conditions warrant. PLAN NOW so you will know what to do in an emergency. Keep informed by listening to local radio and television for statements and possible warnings. Follow the advice of public safety officials. && $$ IDM
045 WGUS66 KSTO 212011 FFASTO Flood Watch National Weather Service Sacramento CA 111 PM PDT Thu Oct 21 2021 .An intense band of precipitation will move through this evening through Friday morning. Periods of moderate to heavy rain are expected, especially Friday morning. These could bring potential ash and debris flows over recent burn scar areas in Shasta, Tehama, Butte and Plumas counties. Potential rainfall rates will be over a half inch per hour this evening. Snow levels will be high. CAZ013-221200- /O.CON.KSTO.FF.A.0003.211022T0000Z-211022T1500Z/ /00000.0.BS.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Shasta Lake Area / Northern Shasta County- Including the cities of Shasta Dam 111 PM PDT Thu Oct 21 2021 ...FLASH FLOOD/DEBRIS FLOW WATCH REMAINS IN EFFECT FROM 5 PM PDT THIS AFTERNOON THROUGH FRIDAY MORNING FOR THE SHASTA COUNTY PORTION OF THE CARR-DELTA-HIRZ BURN SCAR... The Flash Flood Watch continues for * The Shasta County portion of the Carr-Delta-Hirz Burn Scar in northern California. * From 5 PM PDT this afternoon through Friday morning. * Periods of heavy rainfall are forecasted over the Carr-Delta-Hirz Burn Scar, which may lead to flash flooding and debris flows. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. Local emergency services are monitoring the situation and will issue a public statement as conditions warrant. PLAN NOW so you will know what to do in an emergency. Keep informed by listening to local radio and television for statements and possible warnings. Follow the advice of public safety officials. && $$ CAZ015-063-221200- /O.CON.KSTO.FF.A.0003.211022T0000Z-211022T1500Z/ /00000.0.BS.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Northern Sacramento Valley-Mountains Southwestern Shasta County to Western Colusa County- Including the cities of Redding, Red Bluff, and Alder Springs 111 PM PDT Thu Oct 21 2021 ...FLASH FLOOD/DEBRIS FLOW WATCH REMAINS IN EFFECT FROM 5 PM PDT THIS AFTERNOON THROUGH FRIDAY MORNING FOR THE SHASTA COUNTY PORTION OF THE ZOGG BURN SCAR... The Flash Flood Watch continues for * The Shasta County portion of the Zogg Burn Scar in northern California. * From 5 PM PDT this afternoon through Friday morning. * Periods of heavy rainfall are forecasted over the Zogg Burn Scar, which may lead to flash flooding and debris flows. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. Local emergency services are monitoring the situation and will issue a public statement as conditions warrant. PLAN NOW so you will know what to do in an emergency. Keep informed by listening to local radio and television for statements and possible warnings. Follow the advice of public safety officials. && $$ CAZ014-221200- /O.CON.KSTO.FF.A.0003.211022T0600Z-211022T1800Z/ /00000.0.BS.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Burney Basin / Eastern Shasta County- Including the cities of Burney 111 PM PDT Thu Oct 21 2021 ...FLASH FLOOD/DEBRIS FLOW WATCH REMAINS IN EFFECT FROM 11 PM PDT THIS EVENING THROUGH FRIDAY MORNING FOR THE DIXIE BURN SCAR... The Flash Flood Watch continues for * The Dixie burn scar in a portion of northern California, including the following area, Burney Basin / Eastern Shasta County. * From 11 PM PDT this evening through Friday morning. * Periods of heavy rainfall are forecasted over the Dixie, which may lead to flash flooding and debris flows. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. Local emergency services are monitoring the situation and will issue a public statement as conditions warrant. PLAN NOW so you will know what to do in an emergency. Keep informed by listening to local radio and television for statements and possible warnings. Follow the advice of public safety officials. && $$ CAZ066-068-221200- /O.CON.KSTO.FF.A.0003.211022T0600Z-211022T1800Z/ /00000.0.BS.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Northeast Foothills/Sacramento Valley-Western Plumas County/Lassen Park- Including the cities of Quincy, Chester, and Paradise 111 PM PDT Thu Oct 21 2021 ...FLASH FLOOD/DEBRIS FLOW WATCH REMAINS IN EFFECT FROM 11 PM PDT THIS EVENING THROUGH FRIDAY MORNING FOR THE BUTTE AND PLUMAS COUNTY PORTION OF THE BEAR AND CLAREMONT FIRES IN THE NORTH COMPLEX BURN SCAR... The Flash Flood Watch continues for * The Butte and Plumas County portion of the Bear and Claremont Fires in the North Complex Burn Scar in northern California. * From 11 PM PDT this evening through Friday morning. * Periods of heavy rainfall are forecasted over the Bear and Claremont Fires in the North Complex Burn Scar, which may lead to flash flooding and debris flows. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. Local emergency services are monitoring the situation and will issue a public statement as conditions warrant. PLAN NOW so you will know what to do in an emergency. Keep informed by listening to local radio and television for statements and possible warnings. Follow the advice of public safety officials. && $$ Eh
326 WGUS66 KSTO 212141 FFASTO URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Sacramento CA 241 PM PDT Thu Oct 21 2021 .An intense band of precipitation will move through this evening into Friday morning. Periods of moderate to heavy rain are expected, especially Friday morning. These could bring potential ash and debris flows over recent burn scar areas in Shasta, Tehama, Butte and Plumas counties. Potential rainfall rates will be over a half inch per hour this evening. Snow levels will be high. A Flood Watch has been issued for interior Northern California from Saturday evening through Monday afternoon. Long duration moderate to heavy rain may lead to urban and small stream flooding during this time. CAZ013-221300- /O.NEW.KSTO.FA.A.0001.211024T0600Z-211026T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ /O.CON.KSTO.FF.A.0003.211022T0000Z-211022T1500Z/ /00000.0.BS.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Shasta Lake Area / Northern Shasta County- Including the cities of Shasta Dam 241 PM PDT Thu Oct 21 2021 ...FLASH FLOOD/DEBRIS FLOW WATCH REMAINS IN EFFECT FROM 5 PM PDT THIS AFTERNOON THROUGH FRIDAY MORNING FOR THE SHASTA COUNTY PORTION OF THE CARR-DELTA-HIRZ BURN SCAR... ...FLOOD WATCH IN EFFECT FROM SATURDAY EVENING THROUGH MONDAY AFTERNOON... The Flash Flood Watch continues for * The Shasta County portion of the Carr-Delta-Hirz Burn Scar in northern California. * Through Friday morning. * Periods of heavy rainfall are forecasted over the Carr-Delta-Hirz Burn Scar, which may lead to flash flooding and debris flows. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. Local emergency services are monitoring the situation and will issue a public statement as conditions warrant. PLAN NOW so you will know what to do in an emergency. Keep informed by listening to local radio and television for statements and possible warnings. Follow the advice of public safety officials. && The National Weather Service in Sacramento has issued a * Flood Watch for a portion of northern California, including the following area, Shasta Lake Area / Northern Shasta County. * From Saturday evening through Monday afternoon. * Heavy rain may lead to urban and small stream flooding. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. && $$ CAZ015-063-221300- /O.NEW.KSTO.FA.A.0001.211024T0600Z-211026T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ /O.CON.KSTO.FF.A.0003.211022T0000Z-211022T1500Z/ /00000.0.BS.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Northern Sacramento Valley-Mountains Southwestern Shasta County to Western Colusa County- Including the cities of Redding, Red Bluff, and Alder Springs 241 PM PDT Thu Oct 21 2021 ...FLASH FLOOD/DEBRIS FLOW WATCH REMAINS IN EFFECT FROM 5 PM PDT THIS AFTERNOON THROUGH FRIDAY MORNING FOR THE SHASTA COUNTY PORTION OF THE ZOGG BURN SCAR... ...FLOOD WATCH IN EFFECT FROM SATURDAY EVENING THROUGH MONDAY AFTERNOON... The Flash Flood Watch continues for * The Shasta County portion of the Zogg Burn Scar in northern California. * Through Friday morning. * Periods of heavy rainfall are forecasted over the Zogg Burn Scar, which may lead to flash flooding and debris flows. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. Local emergency services are monitoring the situation and will issue a public statement as conditions warrant. PLAN NOW so you will know what to do in an emergency. Keep informed by listening to local radio and television for statements and possible warnings. Follow the advice of public safety officials. && The National Weather Service in Sacramento has issued a * Flood Watch for a portion of northern California, including the following areas, Mountains Southwestern Shasta County to Western Colusa County and Northern Sacramento Valley. * From Saturday evening through Monday afternoon. * Heavy rain may lead to urban and small stream flooding. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. && $$ CAZ014-221300- /O.NEW.KSTO.FA.A.0001.211024T0600Z-211026T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ /O.CON.KSTO.FF.A.0003.211022T0600Z-211022T1800Z/ /00000.0.BS.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Burney Basin / Eastern Shasta County- Including the cities of Burney 241 PM PDT Thu Oct 21 2021 ...FLASH FLOOD/DEBRIS FLOW WATCH REMAINS IN EFFECT FROM 11 PM PDT THIS EVENING THROUGH FRIDAY MORNING FOR THE DIXIE BURN SCAR... ...FLOOD WATCH IN EFFECT FROM SATURDAY EVENING THROUGH MONDAY AFTERNOON... The Flash Flood Watch continues for * The Dixie burn scar in a portion of northern California, including the following area, Burney Basin / Eastern Shasta County. * From 11 PM PDT this evening through Friday morning. * Periods of heavy rainfall are forecasted over the Dixie Burn Scar, which may lead to flash flooding and debris flows. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. Local emergency services are monitoring the situation and will issue a public statement as conditions warrant. PLAN NOW so you will know what to do in an emergency. Keep informed by listening to local radio and television for statements and possible warnings. Follow the advice of public safety officials. && The National Weather Service in Sacramento has issued a * Flood Watch for a portion of northern California, including the following area, Burney Basin / Eastern Shasta County. * From Saturday evening through Monday afternoon. * Heavy rain may lead to urban and small stream flooding. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. && $$ CAZ066-068-221300- /O.NEW.KSTO.FA.A.0001.211024T0600Z-211026T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ /O.CON.KSTO.FF.A.0003.211022T0600Z-211022T1800Z/ /00000.0.BS.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Northeast Foothills/Sacramento Valley-Western Plumas County/Lassen Park- Including the cities of Quincy, Chester, and Paradise 241 PM PDT Thu Oct 21 2021 ...FLASH FLOOD/DEBRIS FLOW WATCH REMAINS IN EFFECT FROM 11 PM PDT THIS EVENING THROUGH FRIDAY MORNING FOR THE BUTTE AND PLUMAS COUNTY PORTION OF THE BEAR AND CLAREMONT FIRES IN THE NORTH COMPLEX BURN SCAR... ...FLOOD WATCH IN EFFECT FROM SATURDAY EVENING THROUGH MONDAY AFTERNOON... The Flash Flood Watch continues for * The Butte and Plumas County portion of the Bear and Claremont Fires in the North Complex Burn Scar in northern California. * From 11 PM PDT this evening through Friday morning. * Periods of heavy rainfall are forecasted over the Bear and Claremont Fires in the North Complex Burn Scar, which may lead to flash flooding and debris flows. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. Local emergency services are monitoring the situation and will issue a public statement as conditions warrant. PLAN NOW so you will know what to do in an emergency. Keep informed by listening to local radio and television for statements and possible warnings. Follow the advice of public safety officials. && The National Weather Service in Sacramento has issued a * Flood Watch for a portion of northern California, including the following areas, Northeast Foothills/Sacramento Valley and Western Plumas County/Lassen Park. * From Saturday evening through Monday afternoon. * Heavy rain may lead to urban and small stream flooding. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. && $$ CAZ016>019-067-069-221300- /O.NEW.KSTO.FA.A.0001.211024T0600Z-211026T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Central Sacramento Valley-Southern Sacramento Valley-Carquinez Strait and Delta-Northern San Joaquin Valley-Motherlode-West Slope Northern Sierra Nevada- Including the cities of Fairfield/Suisun, Blue Canyon, Jackson, Stockton, Marysville/Yuba City, Sacramento, Grass Valley, Modesto, Oroville, and Chico 241 PM PDT Thu Oct 21 2021 ...FLOOD WATCH IN EFFECT FROM SATURDAY EVENING THROUGH MONDAY AFTERNOON... The National Weather Service in Sacramento has issued a * Flood Watch for a portion of northern California, including the following areas, Carquinez Strait and Delta, Central Sacramento Valley, Motherlode, Northern San Joaquin Valley, Southern Sacramento Valley and West Slope Northern Sierra Nevada. * From Saturday evening through Monday afternoon. * Heavy rain may lead to urban and small stream flooding. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. && $$ Eh
843 WGUS66 KSTO 221250 FFASTO Flood Watch National Weather Service Sacramento CA 550 AM PDT Fri Oct 22 2021 .Periods of moderate to heavy rain are expected this morning. This could bring potential ash and debris flows over recent burn scar areas in Shasta, Tehama, Butte and Plumas counties. Potential rainfall rates will be over a half inch per hour this morning. Snow levels will be high. A Flood Watch has been issued for interior Northern California from Saturday evening through Monday afternoon. Long duration moderate to heavy rain may lead to urban and small stream flooding during this time. CAZ014-230015- /O.CON.KSTO.FF.A.0003.000000T0000Z-211022T1800Z/ /00000.0.BS.000000T0000Z.000000T0000Z.000000T0000Z.OO/ /O.CON.KSTO.FA.A.0001.211024T0600Z-211026T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Burney Basin / Eastern Shasta County- Including the cities of Burney 550 AM PDT Fri Oct 22 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 11 AM PDT THIS MORNING... ...FLOOD WATCH REMAINS IN EFFECT FROM SATURDAY EVENING THROUGH MONDAY AFTERNOON... The Flash Flood Watch continues for * The Plumas and Shasta County portion of the Dixie Burn Scar in northern California. * Until 11 AM PDT this morning. * Moderate to heavy rain is occurring over the Dixie burn scar this morning, which may lead to flash flooding and debris flows. * Ash and debris flows will be possible near the Dixie Fire burn scar. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. Local emergency services are monitoring the situation and will issue a public statement as conditions warrant. PLAN NOW so you will know what to do in an emergency. Keep informed by listening to local radio and television for statements and possible warnings. Follow the advice of public safety officials. && The Flood Watch continues for * A portion of northern California, including the following area, Burney Basin / Eastern Shasta County. * From Saturday evening through Monday afternoon. * Periods of moderate to heavy rain are expected this morning, and again late Saturday night and Sunday. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. && $$ CAZ066-068-230015- /O.CON.KSTO.FF.A.0003.000000T0000Z-211022T1800Z/ /00000.0.BS.000000T0000Z.000000T0000Z.000000T0000Z.OO/ /O.CON.KSTO.FA.A.0001.211024T0600Z-211026T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Northeast Foothills/Sacramento Valley-Western Plumas County/Lassen Park- Including the cities of Quincy, Chester, and Paradise 550 AM PDT Fri Oct 22 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 11 AM PDT THIS MORNING... ...FLOOD WATCH REMAINS IN EFFECT FROM SATURDAY EVENING THROUGH MONDAY AFTERNOON... The Flash Flood Watch continues for * The Butte and Plumas County portion of the Bear and Claremont Fires in the North Complex Burn Scar in northern California. * Until 11 AM PDT this morning. * Periods of heavy rainfall are forecasted over the Bear and Claremont Fires in the North Complex Burn Scar, which may lead to flash flooding and debris flows. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. Local emergency services are monitoring the situation and will issue a public statement as conditions warrant. PLAN NOW so you will know what to do in an emergency. Keep informed by listening to local radio and television for statements and possible warnings. Follow the advice of public safety officials. && The Flood Watch continues for * A portion of northern California, including the following areas, Northeast Foothills/Sacramento Valley and Western Plumas County/Lassen Park. * From Saturday evening through Monday afternoon. * Periods of moderate to heavy rain are expected this morning and again on Saturday night and Sunday. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. && $$ CAZ013-230015- /O.CON.KSTO.FF.A.0003.000000T0000Z-211022T1500Z/ /00000.0.BS.000000T0000Z.000000T0000Z.000000T0000Z.OO/ /O.CON.KSTO.FA.A.0001.211024T0600Z-211026T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Shasta Lake Area / Northern Shasta County- Including the cities of Shasta Dam 550 AM PDT Fri Oct 22 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 8 AM PDT THIS MORNING... ...FLOOD WATCH REMAINS IN EFFECT FROM SATURDAY EVENING THROUGH MONDAY AFTERNOON... The Flash Flood Watch continues for * The Shasta County portion of the Carr-Delta-Hirz Burn Scar in northern California. * Until 8 AM PDT this morning. * Periods of heavy rainfall are forecasted over the Carr-Delta-Hirz Burn Scar, which may lead to flash flooding and debris flows. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. Local emergency services are monitoring the situation and will issue a public statement as conditions warrant. PLAN NOW so you will know what to do in an emergency. Keep informed by listening to local radio and television for statements and possible warnings. Follow the advice of public safety officials. && The Flood Watch continues for * A portion of northern California, including the following area, Shasta Lake Area / Northern Shasta County. * From Saturday evening through Monday afternoon. * Periods of moderate to heavy rain are expected this morning, and again late Saturday night and Sunday. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. && $$ CAZ015-063-230015- /O.CON.KSTO.FF.A.0003.000000T0000Z-211022T1500Z/ /00000.0.BS.000000T0000Z.000000T0000Z.000000T0000Z.OO/ /O.CON.KSTO.FA.A.0001.211024T0600Z-211026T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Northern Sacramento Valley-Mountains Southwestern Shasta County to Western Colusa County- Including the cities of Redding, Red Bluff, and Alder Springs 550 AM PDT Fri Oct 22 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 8 AM PDT THIS MORNING... ...FLOOD WATCH REMAINS IN EFFECT FROM SATURDAY EVENING THROUGH MONDAY AFTERNOON... The Flash Flood Watch continues for * The Shasta County portion of the Zogg Burn Scar in northern California. * Until 8 AM PDT this morning. * Periods of heavy rainfall are forecasted over the Zogg Burn Scar, which may lead to flash flooding and debris flows. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. Local emergency services are monitoring the situation and will issue a public statement as conditions warrant. PLAN NOW so you will know what to do in an emergency. Keep informed by listening to local radio and television for statements and possible warnings. Follow the advice of public safety officials. && The Flood Watch continues for * A portion of northern California, including the following areas, Mountains Southwestern Shasta County to Western Colusa County and Northern Sacramento Valley. * From Saturday evening through Monday afternoon. * Periods of moderate to heavy rain this morning, and expected again late Saturday night and Sunday. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. && $$ CAZ016>019-067-069-230015- /O.CON.KSTO.FA.A.0001.211024T0600Z-211026T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Central Sacramento Valley-Southern Sacramento Valley-Carquinez Strait and Delta-Northern San Joaquin Valley-Motherlode-West Slope Northern Sierra Nevada- Including the cities of Fairfield/Suisun, Blue Canyon, Jackson, Stockton, Marysville/Yuba City, Sacramento, Grass Valley, Modesto, Oroville, and Chico 550 AM PDT Fri Oct 22 2021 ...FLOOD WATCH REMAINS IN EFFECT FROM SATURDAY EVENING THROUGH MONDAY AFTERNOON... The Flood Watch continues for * A portion of northern California, including the following areas, Carquinez Strait and Delta, Central Sacramento Valley, Motherlode, Northern San Joaquin Valley, Southern Sacramento Valley and West Slope Northern Sierra Nevada. * From Saturday evening through Monday afternoon. * A prolonged period of moderate to heavy rain is expected across the region from late Saturday night through Sunday. Flood impacts may linger into Monday. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. && $$ DFR
292 WGUS66 KSTO 221455 FFASTO Flood Watch National Weather Service Sacramento CA 755 AM PDT Fri Oct 22 2021 CAZ013-230000- /O.CAN.KSTO.FF.A.0003.000000T0000Z-211022T1500Z/ /O.CON.KSTO.FA.A.0001.211024T0600Z-211026T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Shasta Lake Area / Northern Shasta County- Including the cities of Shasta Dam 755 AM PDT Fri Oct 22 2021 ...FLOOD WATCH REMAINS IN EFFECT FROM SATURDAY EVENING THROUGH MONDAY AFTERNOON... ...FLASH FLOOD/DEBRIS FLOW WATCH IS CANCELLED FOR THE SHASTA COUNTY PORTION OF THE CARR-DELTA-HIRZ BURN SCAR... The Flood Watch continues for * A portion of northern California, including the following area, Shasta Lake Area / Northern Shasta County. * From Saturday evening through Monday afternoon. * Periods of moderate to heavy rain are expected late Saturday night and Sunday. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. && The Flash Flood Watch for a portion of northern California, including the following area, Shasta Lake Area / Northern Shasta County has been cancelled. Flooding is no longer expected to pose a threat. Please continue to heed remaining road closures. $$ CAZ015-063-230000- /O.EXP.KSTO.FF.A.0003.000000T0000Z-211022T1500Z/ /O.CON.KSTO.FA.A.0001.211024T0600Z-211026T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Northern Sacramento Valley-Mountains Southwestern Shasta County to Western Colusa County- Including the cities of Redding, Red Bluff, and Alder Springs 755 AM PDT Fri Oct 22 2021 ...FLOOD WATCH REMAINS IN EFFECT FROM SATURDAY EVENING THROUGH MONDAY AFTERNOON... ...FLASH FLOOD/DEBRIS FLOW WATCH WILL EXPIRE AT 8 AM PDT THIS MORNING FOR THE SHASTA COUNTY PORTION OF THE ZOGG BURN SCAR... The Flood Watch continues for * A portion of northern California, including the following areas, Mountains Southwestern Shasta County to Western Colusa County and Northern Sacramento Valley. * From Saturday evening through Monday afternoon. * Periods of moderate to heavy rain are expected late Saturday night and Sunday. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. && The Flash Flood Watch for a portion of northern California, including the following areas, Mountains Southwestern Shasta County to Western Colusa County and Northern Sacramento Valley will expire at 8 AM PDT this morning. Flooding is no longer expected to pose a threat. Please continue to heed remaining road closures. $$ CAZ014-230000- /O.CON.KSTO.FF.A.0003.000000T0000Z-211022T1800Z/ /00000.0.BS.000000T0000Z.000000T0000Z.000000T0000Z.OO/ /O.CON.KSTO.FA.A.0001.211024T0600Z-211026T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Burney Basin / Eastern Shasta County- Including the cities of Burney 755 AM PDT Fri Oct 22 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 11 AM PDT THIS MORNING... ...FLOOD WATCH REMAINS IN EFFECT FROM SATURDAY EVENING THROUGH MONDAY AFTERNOON... The Flash Flood Watch continues for * The Plumas and Shasta County portion of the Dixie Burn Scar in northern California. * Until 11 AM PDT this morning. * Periods of heavy rainfall are forecasted over the Dixie burn scar, which may lead to flash flooding and debris flows. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. Local emergency services are monitoring the situation and will issue a public statement as conditions warrant. PLAN NOW so you will know what to do in an emergency. Keep informed by listening to local radio and television for statements and possible warnings. Follow the advice of public safety officials. && The Flood Watch continues for * A portion of northern California, including the following area, Burney Basin / Eastern Shasta County. * From Saturday evening through Monday afternoon. * Periods of moderate to heavy rain are expected late Saturday night through Monday. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. && $$ CAZ066-068-230000- /O.CON.KSTO.FF.A.0003.000000T0000Z-211022T1800Z/ /00000.0.BS.000000T0000Z.000000T0000Z.000000T0000Z.OO/ /O.CON.KSTO.FA.A.0001.211024T0600Z-211026T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Northeast Foothills/Sacramento Valley-Western Plumas County/Lassen Park- Including the cities of Quincy, Chester, and Paradise 755 AM PDT Fri Oct 22 2021 ...FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 11 AM PDT THIS MORNING... ...FLOOD WATCH REMAINS IN EFFECT FROM SATURDAY EVENING THROUGH MONDAY AFTERNOON... The Flash Flood Watch continues for * The Butte and Plumas County portion of the Bear and Claremont Fires in the North Complex Burn Scar in northern California. * Until 11 AM PDT this morning. * Periods of heavy rainfall are forecasted over the Bear and Claremont Fires in the North Complex Burn Scar, which may lead to flash flooding and debris flows. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. Local emergency services are monitoring the situation and will issue a public statement as conditions warrant. PLAN NOW so you will know what to do in an emergency. Keep informed by listening to local radio and television for statements and possible warnings. Follow the advice of public safety officials. && The Flood Watch continues for * A portion of northern California, including the following areas, Northeast Foothills/Sacramento Valley and Western Plumas County/Lassen Park. * From Saturday evening through Monday afternoon. * Periods of moderate to heavy rain are expected late Saturday night through Monday. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. && $$ CAZ016>019-067-069-230000- /O.CON.KSTO.FA.A.0001.211024T0600Z-211026T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Central Sacramento Valley-Southern Sacramento Valley-Carquinez Strait and Delta-Northern San Joaquin Valley-Motherlode-West Slope Northern Sierra Nevada- Including the cities of Fairfield/Suisun, Blue Canyon, Jackson, Stockton, Marysville/Yuba City, Sacramento, Grass Valley, Modesto, Oroville, and Chico 755 AM PDT Fri Oct 22 2021 ...FLOOD WATCH REMAINS IN EFFECT FROM SATURDAY EVENING THROUGH MONDAY AFTERNOON... The Flood Watch continues for * A portion of northern California, including the following areas, Carquinez Strait and Delta, Central Sacramento Valley, Motherlode, Northern San Joaquin Valley, Southern Sacramento Valley and West Slope Northern Sierra Nevada. * From Saturday evening through Monday afternoon. * Periods of moderate to heavy rain are expected late Saturday night through Monday. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. && $$ eh
800 WGUS66 KSTO 221736 FFASTO Flood Watch National Weather Service Sacramento CA 1036 AM PDT Fri Oct 22 2021 CAZ014-230145- /O.CAN.KSTO.FF.A.0003.000000T0000Z-211022T1800Z/ /O.CON.KSTO.FA.A.0001.211024T0600Z-211026T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Burney Basin / Eastern Shasta County- Including the cities of Burney 1036 AM PDT Fri Oct 22 2021 ...FLOOD WATCH REMAINS IN EFFECT FROM SATURDAY EVENING THROUGH MONDAY AFTERNOON ...FLASH FLOOD/DEBRIS FLOW WATCH IS CANCELLED FOR THE PLUMAS AND SHASTA COUNTY PORTION OF THE DIXIE BURN SCAR... The Flood Watch continues for * A portion of northern California, including the following area, Burney Basin / Eastern Shasta County. * From Saturday evening through Monday afternoon. * Periods of moderate to heavy rain are expected late Saturday night and Sunday. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. && The Flash Flood Watch for a portion of northern California, including the following area, Burney Basin / Eastern Shasta County has been cancelled. Flooding is no longer expected to pose a threat. Please continue to heed remaining road closures. $$ CAZ066-068-230145- /O.EXP.KSTO.FF.A.0003.000000T0000Z-211022T1800Z/ /O.CON.KSTO.FA.A.0001.211024T0600Z-211026T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Northeast Foothills/Sacramento Valley-Western Plumas County/Lassen Park- Including the cities of Quincy, Chester, and Paradise 1036 AM PDT Fri Oct 22 2021 ...FLOOD WATCH REMAINS IN EFFECT FROM SATURDAY EVENING THROUGH MONDAY AFTERNOON ...FLASH FLOOD/DEBRIS FLOW WATCH WILL EXPIRE AT 11 AM PDT THIS MORNING FOR THE BUTTE AND PLUMAS COUNTY PORTION OF THE BEAR AND CLAREMONT FIRES IN THE NORTH COMPLEX BURN SCAR... The Flood Watch continues for * A portion of northern California, including the following areas, Northeast Foothills/Sacramento Valley and Western Plumas County/Lassen Park. * From Saturday evening through Monday afternoon. * Periods of moderate to heavy rain are expected late Saturday night and Sunday. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. && The Flash Flood Watch for a portion of northern California, including the following areas, Northeast Foothills/Sacramento Valley and Western Plumas County/Lassen Park will expire at 11 AM PDT this morning. Flooding is no longer expected to pose a threat. Please continue to heed remaining road closures. $$ CAZ013-015>019-063-067-069-230145- /O.CON.KSTO.FA.A.0001.211024T0600Z-211026T0000Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Shasta Lake Area / Northern Shasta County-Northern Sacramento Valley- Central Sacramento Valley-Southern Sacramento Valley-Carquinez Strait and Delta-Northern San Joaquin Valley-Mountains Southwestern Shasta County to Western Colusa County-Motherlode-West Slope Northern Sierra Nevada- Including the cities of Fairfield/Suisun, Blue Canyon, Jackson, Stockton, Marysville/Yuba City, Sacramento, Alder Springs, Grass Valley, Shasta Dam, Modesto, Oroville, Redding, Red Bluff, and Chico 1036 AM PDT Fri Oct 22 2021 ...FLOOD WATCH REMAINS IN EFFECT FROM SATURDAY EVENING THROUGH MONDAY AFTERNOON... The Flood Watch continues for * A portion of northern California, including the following areas, Carquinez Strait and Delta, Central Sacramento Valley, Motherlode, Mountains Southwestern Shasta County to Western Colusa County, Northern Sacramento Valley, Northern San Joaquin Valley, Shasta Lake Area / Northern Shasta County, Southern Sacramento Valley and West Slope Northern Sierra Nevada. * From Saturday evening through Monday afternoon. * Periods of moderate to heavy rain are expected late Saturday night and Sunday. PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. && $$ eh
What forecasters said that day
The local office's own words before this flash flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Sacramento, CA wrote its last area forecast discussion before this flash flood watch went out at Oct 20, 4:20 AM PDT, 7 hours 11 minutes earlier.
Area forecast discussion, Oct 20, 4:20 AM PDT, 7 hours 11 minutes before
Area Forecast Discussion National Weather Service Sacramento CA 420 AM PDT Wed Oct 20 2021 .SYNOPSIS... A period of wet weather is expected across the region into next week as several Pacific weather systems affect NorCal. Moderate to heavy rain will be possible at times along with gusty winds, particularly Friday and Sunday. Heavy snow will be possible in the northern Sierra early next week. && .DISCUSSION... Satellite imagery shows the upper trough lifting to the north into the PacNW early this morning. Rainfall amounts since late Tuesday have been generally light, around 1/4 to 1/2 inch across the northern Sacramento Valley and surrounding terrain with only sprinkles or a few hundredths of an inch reported so far further south. Radar shows scattered light to very light precipitation over much of the region early this morning. Current temperatures are considerably milder compared to 24 hours ago with many areas reporting readings that are 10-20 degrees warmer. Southerly breezes are picking up across the northern half of the Sacramento Valley and over higher terrain as the surface gradient tightens. The SAC-MFR gradient is around 8 mbs while the SAC-RNO gradient is approaching 6 mbs. Gusts in the 20s to mid 30s mph are common across that area. Minor disturbances embedded in the west-southwest flow, along with warm-advection, will keep mostly light precipitation going across the region today and Thursday. Some light snowfall accumulations (around an inch) will be possible this morning near the pass levels in the northern Sierra before snow levels rise further. Precipitation will likely pick up later tonight and Thursday across the orographically favored areas of the northern mountains and northern Sierra as flow backs ahead of Friday's trough. Moisture transport increases across NorCal on Friday as the next incoming trough draws 1 to 1.5 inch TPW northward. A relatively quick shot of moderate to heavy precipitation will move across the region Friday with 2-4 inches of rain possible in the northern mountains with 1-2 inches in the northern Sierra (mainly north of Highway 50). Lighter amounts are likely in the valley. Snow levels will be very high (above 9k ft) limiting accumulations to just the highest peaks. A relative short break in precipitation is likely Friday night into Saturday before increasing again later Saturday ahead of Sunday's stronger system. && .EXTENDED DISCUSSION (Sunday THROUGH Wednesday)... High confidence continues in a moderately strong AR forecast to affect the region on Sunday as a wide TPW plume of 1.5 to 1.75 inches is drawn northward into NorCal. Strong upward vertical motion from the strong polar jet nosing into the region will support an extended period of moderate to heavy rain with 1-3 inches possible in the valley with 3-5 inches in the foothills and mountains. Significant impacts, including ash and debris flows, will be possible particularly in and near recent burn scars, though the details on where the heaviest precipitation will setup remain somewhat uncertain. Light to moderate precipitation continues Monday as the trough swings through, then gradually tapers into the middle of next week as ridging from the eastern Pacific edges into NorCal. Focus of more significant impacts will shift to the higher elevations of the northern Sierra early next week as snow levels lower below the pass levels bringing several feet of accumulation above about 6k ft, mainly Monday and Monday night. && .AVIATION... Areas of MVFR conditions, locally IFR, next 24 hours in showers. Local SE wind gusts to 20 to 25 kt over the northern Sacramento Valley through 18z. Gusts to 30 to 40 kts are possible over higher terrain through this afternoon. && .STO WATCHES/WARNINGS/ADVISORIES...None. &&
Nearby
Flash Flood Watches in California, 2021Every flash flood watch in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text.