Alert archive / California / Flood Watches in 2021
Flood Watch 3, NWS Eureka, CA
NWS Eureka, CA issued this flood watch at Jan 31, 2021, 4:28 AM PST for 4 counties in California. It took effect at Jan 31, 2021, 10:00 AM PST. It was in force for 19 hr.
The area
The counties it named.
The facts
- Issued
- Jan 31, 2021, 4:28 AM PST (12:28 UTC)
- In effect from
- Jan 31, 2021, 10:00 AM PST
- Expired
- Feb 1, 2021, 5:16 AM PST
- In force
- 19 hr
- Issued by
- NWS Eureka, CA
- Flood severity
- None
Counties Del Norte County, CA, Humboldt County, CA, Mendocino County, CA, Trinity County, CA
The radar
The Eureka (Bunker Hill) radar (KBHX), 60 km from the middle of the area, began a volume at 12:27 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, 0.5 hours before the alert went out and 204 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
- 1633 m above ground
- 0-6 km bulk shear
- 0 kt
- 0-1 km storm-relative helicity
- 0 m²/s²
- 0-3 km storm-relative helicity
- 0 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
713 WGUS66 KEKA 311228 FFAEKA URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Eureka CA 428 AM PST Sun Jan 31 2021 .An atmospheric river will focus near the northwest California coast much of Sunday and Monday, before shifting eastward across our area with a cold front late Monday or Monday night. Periods of moderate to heavy rainfall will result, on top of areas where soils have been saturated from recent rains, and heavy snowpack is present. The focus of the heavier rain has shifted a bit farther north and west though, lowering the threat for much of Mendocino County. CAZ101>106-108>111-312030- /O.CAN.KEKA.FA.A.0002.000000T0000Z-210202T1200Z/ /O.NEW.KEKA.FA.A.0003.210131T1800Z-210202T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Coastal Del Norte-Del Norte Interior-Northern Humboldt Coast- Southwestern Humboldt-Northern Humboldt Interior- Southern Humboldt Interior-Southern Trinity-Mendocino Coast- Northwestern Mendocino Interior-Northeastern Mendocino Interior- 428 AM PST Sun Jan 31 2021 ...FLOOD WATCH IN EFFECT FROM 10 AM PST THIS MORNING THROUGH LATE MONDAY NIGHT... The National Weather Service in Eureka has issued a * Flood Watch for a portion of northwest California, including the following areas, Coastal Del Norte, Del Norte Interior, Mendocino Coast, Northeastern Mendocino Interior, Northern Humboldt Coast, Northern Humboldt Interior, Northwestern Mendocino Interior, Southern Humboldt Interior, Southern Trinity, and Southwestern Humboldt. * From 10 AM PST this morning through late Monday night * 2 to 4 inches of rain is expected from today through Monday night across coastal and valley locations. 5 to 7 inches expected across southwest facing mountains and ridges. Heavy rain combined with saturated soil and melting snow across the mountains will contribute toward possible flooding. * Low lying areas, creeks, streams, culverts, and portions of urban areas may experience flooding due to heavy rainfall. 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. && $$ JJW
3 follow-up statements
040 WGUS66 KEKA 311753 FFAEKA URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Eureka CA 953 AM PST Sun Jan 31 2021 .An atmospheric river will focus near the northwest California coast today, the bulk of heavier rains today and tonight will be limited to southwest Humboldt and Del Norte County, before shifting eastward across the rest of our area with a cold front on Monday. Periods of moderate to heavy rainfall are still expected through tonight in southwest Humboldt and Del Norte, with more widespread moderate to occasionally heavy rain on Monday. Soils have been saturated from recent rains, and heavy snowpack is present across much of the mountainous terrain, enhancing the risk of flooding in the flood watch area. The duration and amounts of any heavier rain is now less than earlier expected for the northern Humboldt coast and Mendocino County. CAZ103-109>111-311900- /O.CAN.KEKA.FA.A.0003.210131T1800Z-210202T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Northern Humboldt Coast-Mendocino Coast- Northwestern Mendocino Interior-Northeastern Mendocino Interior- 953 AM PST Sun Jan 31 2021 ...FLOOD WATCH IS CANCELLED... The Flood Watch for a portion of northwest California has been cancelled. The main area of moderate to heavier rain is shifting just offshore today, and the bulk of the latest forecast guidance keeps heavier rain just offshore until Monday morning (with the exception of southwest Humboldt and Del Norte County). Total rainfall through Monday night of 1 to 2 inches, with locally over 3 inches in the mountains of northern Humboldt and northwest Mendocino, is still forecast, but the risk of flooding has diminished. $$ CAZ105-106-108-010200- /O.EXT.KEKA.FA.A.0003.210201T1400Z-210202T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Northern Humboldt Interior-Southern Humboldt Interior- Southern Trinity- 953 AM PST Sun Jan 31 2021 ...FLOOD WATCH NOW IN EFFECT FROM MONDAY MORNING THROUGH LATE MONDAY NIGHT... The Flood Watch is now in effect for * A portion of northwest California, including the following areas, Northern Humboldt Interior, Southern Humboldt Interior, and Southern Trinity. * From Monday morning through late Monday night * An additional 1 to 3 inches of rain is expected through Monday night across coastal and valley locations. 3 to 5 inches expected across southwest facing mountains and ridges, much of which will fall on Monday. Heavy rain combined with saturated soil and melting snow across the mountains will contribute toward possible flooding. * Low lying areas, creeks, streams, culverts, and portions of urban areas may experience flooding due to heavy rainfall. 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. && $$ CAZ101-102-104-010200- /O.CON.KEKA.FA.A.0003.210131T1800Z-210202T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Coastal Del Norte-Del Norte Interior-Southwestern Humboldt- 953 AM PST Sun Jan 31 2021 ...FLOOD WATCH REMAINS IN EFFECT THROUGH LATE MONDAY NIGHT... The Flood Watch continues for * A portion of northwest California, including the following areas, Coastal Del Norte, Del Norte Interior, and Southwestern Humboldt. * Through late Monday night * 3 to 4 inches of rain is expected through Monday night across coastal and valley locations. 5 to 7 inches expected across southwest facing mountains and ridges. Heavy rain combined with saturated soil (and melting snow across the mountains) will contribute toward possible flooding. * Low lying areas, creeks, streams, culverts, and portions of urban areas may experience flooding due to heavy rainfall. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flood Watch means there is a potential for flooding based on current forecasts. You should monitor later forecasts and be alert for possible flood warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. && $$
224 WGUS66 KEKA 010210 FFAEKA Flood Watch National Weather Service Eureka CA 610 PM PST Sun Jan 31 2021 CAZ101-102-104>106-108-011415- /O.CON.KEKA.FA.A.0003.000000T0000Z-210202T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Coastal Del Norte-Del Norte Interior-Southwestern Humboldt-Northern Humboldt Interior-Southern Humboldt Interior-Southern Trinity- 610 PM PST Sun Jan 31 2021 ...FLOOD WATCH REMAINS IN EFFECT THROUGH LATE MONDAY NIGHT... The Flood Watch continues for * A portion of northwest California, including the following areas, Coastal Del Norte, Del Norte Interior, Northern Humboldt Interior, Southern Humboldt Interior, Southern Trinity and Southwestern Humboldt. * Through late Monday night * A total of 2 to 4 inches of rain is expected through Monday night across coastal locations. Total of 4 to 6 inches expected across southwest facing mountains and ridges. Heavy rain combined with saturated soil (and melting snow across the mountains) will contribute toward possible flooding. * Low lying areas, creeks, streams, culverts, and portions of urban areas may experience flooding due to heavy rainfall. 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. && $$ CB
328 WGUS66 KEKA 011316 FFAEKA URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Eureka CA 516 AM PST Mon Feb 1 2021 CAZ101-102-104>106-108-012130- /O.CAN.KEKA.FA.A.0003.000000T0000Z-210202T1200Z/ /O.NEW.KEKA.FA.A.0004.210201T1800Z-210202T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Coastal Del Norte-Del Norte Interior-Southwestern Humboldt- Northern Humboldt Interior-Southern Humboldt Interior- Southern Trinity- 516 AM PST Mon Feb 1 2021 ...FLOOD WATCH IN EFFECT FROM 10 AM PST THIS MORNING THROUGH LATE TONIGHT... The National Weather Service in Eureka has issued a * Flood Watch for a portion of northwest California, including the following areas, Coastal Del Norte, Del Norte Interior, Northern Humboldt Interior, Southern Humboldt Interior, Southern Trinity, and Southwestern Humboldt. * From 10 AM PST this morning through late tonight * A total of 2 to 4 inches of additional rain is expected through Monday night across the area. Heavy rain combined with saturated soil (and melting snow across the mountains) will contribute toward possible flooding. * Low lying areas, creeks, streams, culverts, and portions of urban areas may experience flooding due to heavy rainfall. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flood Watch means there is a potential for flooding based on current forecasts. You should monitor later forecasts and be alert for possible flood warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. && $$
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 31, 8:43 AM PST | Small Craft Advisory | EKA | 52 hr |
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.