Alert archive / California / Flood Watches in 2018
Flood Watch 2, NWS Eureka, CA
NWS Eureka, CA issued this flood watch at Apr 5, 2018, 12:25 PM PDT for Humboldt County, Mendocino County, Trinity County, California. It took effect at Apr 6, 2018, 5:00 AM PDT. It was in force for 23 hr.
The area
The counties it named.
The facts
- Issued
- Apr 5, 2018, 12:25 PM PDT (19:25 UTC)
- In effect from
- Apr 6, 2018, 5:00 AM PDT
- Expired
- Apr 7, 2018, 3:57 AM PDT
- In force
- 23 hr
- Issued by
- NWS Eureka, CA
- Flood severity
- None
Counties Humboldt County, CA, Mendocino County, CA, Trinity County, CA
The radar
The Eureka (Bunker Hill) radar (KBHX), 73 km from the middle of the area, began a volume at 19:29 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Medford/Jackson, OR (KMFR), launched 12:00Z, 7.4 hours before the alert went out and 241 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1103 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 60 m²/s²
- 0-3 km storm-relative helicity
- 276 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
146 WGUS66 KEKA 051925 FFAEKA URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Eureka CA 1225 PM PDT Thu Apr 5 2018 ...Moderate to heavy rain Friday and Friday night... .A strong atmospheric river will bring wet weather to the area. Rain has started to spread across the area this afternoon. This will continue through early Saturday morning. The heaviest rain is expected Friday night. There is a slight chance for main stem river flooding, stay tuned to the forecast. CAZ104-106-108>113-060330- /O.NEW.KEKA.FA.A.0002.180406T0900Z-180407T1600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Southwestern Humboldt-Southern Humboldt Interior-Southern Trinity- Mendocino Coast-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Southwestern Mendocino Interior- Southeastern Mendocino Interior- 1225 PM PDT Thu Apr 5 2018 ...FLOOD WATCH IN EFFECT FROM LATE TONIGHT THROUGH SATURDAY MORNING... The National Weather Service in Eureka has issued a * Flood Watch for a portion of northwest California, including the following areas, Mendocino Coast, Northeastern Mendocino Interior, Northwestern Mendocino Interior, Southeastern Mendocino Interior, Southern Humboldt Interior, Southern Trinity, Southwestern Humboldt, and Southwestern Mendocino Interior. * From late tonight through Saturday morning. The heaviest rain is expected Friday afternoon and Friday night. * Rainfall amounts of 3 to 5 inches are expected with local amounts up to 7 inches possible in the higher terrain. * Small stream flooding will become swollen and fast moving. They may exceed their banks and cause flooding. Low lying areas may flood as well. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flood Watch means there is a potential for flooding based on current forecasts. 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. && $$
6 follow-up statements
707 WGUS66 KEKA 060328 FFAEKA URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Eureka CA 828 PM PDT Thu Apr 5 2018 ...Moderate to heavy rain Friday and Friday night... .Light to moderate rain will continue tonight. Moderate to heavy rain is expected Friday through early Saturday morning. The heaviest rain is expected Friday night. There is a slight potential for flooding Friday through Saturday morning. CAZ104-106-108>113-061230- /O.EXT.KEKA.FA.A.0002.180406T1200Z-180407T1600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Southwestern Humboldt-Southern Humboldt Interior-Southern Trinity- Mendocino Coast-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Southwestern Mendocino Interior- Southeastern Mendocino Interior- 828 PM PDT Thu Apr 5 2018 ...FLOOD WATCH NOW IN EFFECT FROM 5 AM PDT FRIDAY THROUGH SATURDAY MORNING... The Flood Watch is now in effect for * A portion of northwest California, including the following areas, Mendocino Coast, Northeastern Mendocino Interior, Northwestern Mendocino Interior, Southeastern Mendocino Interior, Southern Humboldt Interior, Southern Trinity, Southwestern Humboldt, and Southwestern Mendocino Interior. * From late tonight through Saturday morning. The heaviest rain is expected Friday afternoon and Friday night. * Rainfall amounts of 3 to 5 inches are expected with local amounts up to 7 inches possible in the higher terrain. * Small streams will become swollen and fast moving. They may exceed their banks and cause flooding. Low lying areas and rural roads may also flood. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flood Watch means there is a potential for flooding based on current forecasts. You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. && $$
038 WGUS66 KEKA 060951 FFAEKA Flood Watch National Weather Service Eureka CA 251 AM PDT Fri Apr 6 2018 ...Moderate to heavy rain through tonight... .Light to moderate rain will increase in intensity this morning. Moderate to heavy rain is expected this morning through early Saturday morning. The heaviest rain is expected tonight. There is a slight potential for flooding through Saturday morning. CAZ104-106-108>113-061800- /O.CON.KEKA.FA.A.0002.180406T1200Z-180407T1600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Southwestern Humboldt-Southern Humboldt Interior-Southern Trinity- Mendocino Coast-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Southwestern Mendocino Interior- Southeastern Mendocino Interior- 251 AM PDT Fri Apr 6 2018 ...FLOOD WATCH REMAINS IN EFFECT THROUGH SATURDAY MORNING... The Flood Watch continues for * A portion of northwest California, including the following areas, Mendocino Coast, Northeastern Mendocino Interior, Northwestern Mendocino Interior, Southeastern Mendocino Interior, Southern Humboldt Interior, Southern Trinity, Southwestern Humboldt, and Southwestern Mendocino Interior. * Through Saturday morning * Rainfall amounts of 3 to 5 inches are expected with local amounts up to 7 inches possible in higher terrain. * Small streams will become swollen and fast moving. They may exceed their banks and cause flooding. Low lying areas and rural roads may also flood. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flood Watch means there is a potential for flooding based on current forecasts. 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. && $$
621 WGUS66 KEKA 061357 FFAEKA Flood Watch National Weather Service Eureka CA 657 AM PDT Fri Apr 6 2018 .An atmospheric river will bring potential flooding through Saturday to small streams as well as low lying areas with poor drainage. In addition, there is a slightly enhanced potential for debris flow in the Redwood Valley Burn Scar area in the heaviest persistent showers. CAZ104-106-108>113-062200- /O.CON.KEKA.FA.A.0002.000000T0000Z-180407T1600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Southwestern Humboldt-Southern Humboldt Interior-Southern Trinity- Mendocino Coast-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Southwestern Mendocino Interior- Southeastern Mendocino Interior- 657 AM PDT Fri Apr 6 2018 ...FLOOD WATCH REMAINS IN EFFECT THROUGH SATURDAY MORNING... The Flood Watch continues for * A portion of northwest California, including the following areas, Mendocino Coast, Northeastern Mendocino Interior, Northwestern Mendocino Interior, Southeastern Mendocino Interior, Southern Humboldt Interior, Southern Trinity, Southwestern Humboldt, and Southwestern Mendocino Interior. * Through Saturday morning * Rainfall amounts of 3 to 5 inches are expected with local amounts up to 7 inches possible in higher terrain. * Small streams will become swollen and fast moving. They may exceed their banks and cause flooding. Low lying areas and rural roads may also flood. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flood Watch means there is a potential for flooding based on current forecasts. You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. && $$
412 WGUS66 KEKA 062035 FFAEKA Flood Watch National Weather Service Eureka CA 135 PM PDT Fri Apr 6 2018 .Heavy rain is expected to continue through early Saturday morning across much of the region, and is expected to cause small stream and urban flooding in many areas. In addition, there is a slightly enhanced potential for debris flow in the Redwood Valley Burn Scar area in the heaviest persistent showers. CAZ104-106-108>113-070445- /O.CON.KEKA.FA.A.0002.000000T0000Z-180407T1600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Southwestern Humboldt-Southern Humboldt Interior-Southern Trinity- Mendocino Coast-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Southwestern Mendocino Interior- Southeastern Mendocino Interior- 135 PM PDT Fri Apr 6 2018 ...FLOOD WATCH REMAINS IN EFFECT THROUGH SATURDAY MORNING... The Flood Watch continues for * A portion of northwest California, including Southern Humboldt, Southern Trinity and most of Mendocino Counties. The heaviest total accumulations and most widespread impacts are expected across Western and Northern Mendocino County. * Through Saturday morning * ADDITIONAL rainfall accumulations of 3 to 4 inches are expected, with hourly rainfall rates reaching .5 inches per hour at times overnight Friday. STORM TOTAL rainfall amounts, some of which has already fallen, will likely range from 5 to 7 inches across a broad area. * Small streams will become swollen and fast moving. They may exceed their banks and cause flooding. Low lying areas and both rural and urban roads may also flood. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flood Watch means there is a potential for flooding based on current forecasts. 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. && $$
461 WGUS66 KEKA 070350 FFAEKA Flood Watch National Weather Service Eureka CA 850 PM PDT Fri Apr 6 2018 .Heavy rain is expected to continue through early Saturday morning and is expected to cause small stream and urban flooding in many areas. In addition, there is a slightly enhanced potential for debris flow in the Redwood Valley Burn Scar area in the heaviest persistent showers. CAZ104-106-108>113-071200- /O.CON.KEKA.FA.A.0002.000000T0000Z-180407T1600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Southwestern Humboldt-Southern Humboldt Interior-Southern Trinity- Mendocino Coast-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Southwestern Mendocino Interior- Southeastern Mendocino Interior- 850 PM PDT Fri Apr 6 2018 ...FLOOD WATCH REMAINS IN EFFECT THROUGH SATURDAY MORNING... The Flood Watch continues for * A portion of northwest California, including the following areas, Mendocino Coast, Northeastern Mendocino Interior, Northwestern Mendocino Interior, Southeastern Mendocino Interior, Southern Humboldt Interior, Southern Trinity, Southwestern Humboldt, and Southwestern Mendocino Interior. * Through Saturday morning * ADDITIONAL rainfall accumulations of 3 to 4 inches are expected, with hourly rainfall rates reaching .5 inches per hour at times tonight. STORM TOTAL rainfall amounts, some of which has already fallen, will likely range from 5 to 7 inches across a broad area. * Small streams will become swollen and fast moving. They may exceed their banks and cause flooding. Low lying areas and both rural and urban roads may also flood. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flood Watch means there is a potential for flooding based on current forecasts. You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. && $$
729 WGUS66 KEKA 071057 FFAEKA Flood Watch National Weather Service Eureka CA 357 AM PDT Sat Apr 7 2018 CAZ104-106-108>113-071200- /O.CAN.KEKA.FA.A.0002.000000T0000Z-180407T1600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Southwestern Humboldt-Southern Humboldt Interior-Southern Trinity- Mendocino Coast-Northwestern Mendocino Interior- Northeastern Mendocino Interior-Southwestern Mendocino Interior- Southeastern Mendocino Interior- 357 AM PDT Sat Apr 7 2018 ...FLOOD WATCH IS CANCELLED... The Flood Watch for a portion of northwest California has been cancelled. Heavy rain has exited the region, and the threat for small stream flooding will quickly diminish during Saturday morning. $$
Nearby
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.