Alert archive / California / Winter Storm Watches in 2021
Winter Storm Watch 9, NWS Eureka, CA
NWS Eureka, CA issued this winter storm watch at Dec 23, 2021, 2:10 AM PST for 5 counties in California. It took effect at Dec 24, 2021, 10:00 AM PST. It was in force for .
The area
The counties it named.
The facts
- Issued
- Dec 23, 2021, 2:10 AM PST (10:10 UTC)
- In effect from
- Dec 24, 2021, 10:00 AM PST
- Expired
- Dec 23, 2021, 1:17 PM PST
- In force
- Issued by
- NWS Eureka, CA
Counties Del Norte County, CA, Humboldt County, CA, Lake County, CA, Mendocino County, CA, Trinity County, CA
The radar
The Eureka (Bunker Hill) radar (KBHX), 75 km from the middle of the area, began a volume at 10:13 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 00:00Z, 10.2 hours before the alert went out and 233 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
- 1027 m above ground
- 0-6 km bulk shear
- 83 kt
- 0-1 km storm-relative helicity
- 231 m²/s²
- 0-3 km storm-relative helicity
- 416 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
135 WWUS46 KEKA 231010 WSWEKA URGENT - WINTER WEATHER MESSAGE National Weather Service Eureka CA 210 AM PST Thu Dec 23 2021 ...HEAVY MOUNTAIN SNOW DURING THE CHRISTMAS HOLIDAY... .A series of cold upper level storm systems will aid in lowering snow levels to as low as 2000 feet by Saturday afternoon, and then as low as 1000 to 2000 feet Sunday night. Periods of heavy showers spreading across the cold airmass will favor significant mountain snowfall beginning Friday afternoon and lasting through Monday morning. Travel across mountain roadways and highway passes will subsequently be difficult if not impossible. CAZ107-231815- /O.NEW.KEKA.WS.A.0009.211224T1800Z-211227T1800Z/ /O.CON.KEKA.WS.W.0009.000000T0000Z-211223T1800Z/ Northern Trinity- 210 AM PST Thu Dec 23 2021 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 10 AM PST THIS MORNING ABOVE 4000 FEET... ...WINTER STORM WATCH IN EFFECT FROM FRIDAY MORNING THROUGH MONDAY MORNING ABOVE 2000 FEET... * WHAT...For the Winter Storm Warning above 4000 feet, heavy snow. Additional snow accumulations of up to 6 inches. Winds gusting as high as 40 mph. For the Winter Storm Watch above 2000 feet, heavy snow possible. Total snow accumulations of 7 to 24 inches possible. * WHERE...Northern Trinity County. * WHEN...For the Winter Storm Warning, until 10 AM PST this morning. For the Winter Storm Watch, from Friday morning through Monday morning. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact the morning or evening commute. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. Monitor the latest forecasts for updates on this situation. The latest road conditions for the state of California can be obtained by calling 1-800-GAS-ROAD. && $$ CAZ102-105-106-108-110-111-114-231815- /O.NEW.KEKA.WS.A.0009.211224T1800Z-211227T1800Z/ Del Norte Interior-Northern Humboldt Interior- Southern Humboldt Interior-Southern Trinity- Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake- 210 AM PST Thu Dec 23 2021 ...WINTER STORM WATCH IN EFFECT FROM FRIDAY MORNING THROUGH MONDAY MORNING ABOVE 2000 FEET... * WHAT...Heavy snow possible above 2000 feet. Total snow accumulations of 7 to 24 inches possible. * WHERE...Portions of northwest California. * WHEN...From Friday morning through Monday morning. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact the morning or evening commute. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the latest forecasts for updates on this situation. && $$
2 follow-up statements
251 WWUS46 KEKA 231430 WSWEKA URGENT - WINTER WEATHER MESSAGE National Weather Service Eureka CA 630 AM PST Thu Dec 23 2021 ...HEAVY MOUNTAIN SNOW EXPECTED DURING THE CHRISTMAS HOLIDAY... .A series of cold upper level storm systems will aid in lowering snow levels to as low as 2000 feet by Saturday afternoon, and then as low as 1000 to 2000 feet Sunday night. Periods of heavy showers spreading across the cold airmass will favor significant mountain snowfall beginning Friday afternoon and lasting through Monday morning. Travel across mountain roadways and highway passes will subsequently be difficult if not impossible. CAZ107-232230- /O.CAN.KEKA.WS.W.0009.000000T0000Z-211223T1800Z/ /O.CON.KEKA.WS.A.0009.211224T1800Z-211227T1800Z/ Northern Trinity- 630 AM PST Thu Dec 23 2021 ...WINTER STORM WATCH REMAINS IN EFFECT FROM FRIDAY MORNING THROUGH MONDAY MORNING ABOVE 2000 FEET... * WHAT...Heavy snow possible above 2000 feet. Total snow accumulations of 7 to 24 inches possible. * WHERE...Northern Trinity County. * WHEN...From Friday morning through Monday morning. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact the morning or evening commute. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the latest forecasts for updates on this situation. && $$ CAZ102-105-106-108-110-111-114-232230- /O.CON.KEKA.WS.A.0009.211224T1800Z-211227T1800Z/ Del Norte Interior-Northern Humboldt Interior- Southern Humboldt Interior-Southern Trinity- Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake- 630 AM PST Thu Dec 23 2021 ...WINTER STORM WATCH REMAINS IN EFFECT FROM FRIDAY MORNING THROUGH MONDAY MORNING ABOVE 2000 FEET... * WHAT...Heavy snow possible above 2000 feet. Total snow accumulations of 7 to 24 inches possible. * WHERE...Portions of northwest California. * WHEN...From Friday morning through Monday morning. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact the morning or evening commute. PRECAUTIONARY/PREPAREDNESS ACTIONS... Monitor the latest forecasts for updates on this situation. && $$
423 WWUS46 KEKA 232117 WSWEKA URGENT - WINTER WEATHER MESSAGE National Weather Service Eureka CA 117 PM PST Thu Dec 23 2021 ...HEAVY MOUNTAIN SNOW EXPECTED DURING THE CHRISTMAS HOLIDAY... .A series of cold upper level storm systems will aid in lowering snow levels to as low as 2000 feet by Saturday afternoon, and then as low as 1000 to 2000 feet Sunday night. Periods of heavy showers spreading across the cold airmass will favor significant mountain snowfall beginning Friday afternoon and lasting through Monday morning. Travel across mountain roadways and highway passes will subsequently be difficult if not impossible. CAZ102-105>108-110-111-114-240530- /O.UPG.KEKA.WS.A.0009.211224T1800Z-211227T1800Z/ /O.NEW.KEKA.WS.W.0010.211224T1800Z-211227T1800Z/ Del Norte Interior-Northern Humboldt Interior- Southern Humboldt Interior-Northern Trinity-Southern Trinity- Northwestern Mendocino Interior-Northeastern Mendocino Interior- Northern Lake- 117 PM PST Thu Dec 23 2021 ...WINTER STORM WARNING IN EFFECT FROM 10 AM FRIDAY TO 10 AM PST MONDAY ABOVE 2000 FEET... * WHAT...Heavy snow expected above 2000 feet. Total snow accumulations of 1 to 54 inches. * WHERE...Portions of northwest California. * WHEN...From 10 AM Friday to 10 AM PST Monday. * IMPACTS...Travel could be very difficult to impossible. The hazardous conditions could impact the morning or evening commute. PRECAUTIONARY/PREPAREDNESS ACTIONS... If you must travel, keep an extra flashlight, food, and water in your vehicle in case of an emergency. The latest road conditions for the state of California can be obtained by calling 1-800-GAS-ROAD. && $$
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 23, 3:11 AM PST | Small Craft Advisory | EKA | 98 min | |
| Dec 23, 1:17 PM PST | Winter Storm Warning | EKA | Del Norte, Humboldt, Lake, Mendocino, Trinity | 4 days |
| Dec 23, 3:03 PM PST | Small Craft Advisory | EKA | 5 days |
Nearby
Winter Storm Watches in California, 2021Every winter storm 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.