Alert archive / California / Winter Storm Warnings in 2018
Winter Storm Warning 4, NWS Eureka, CA
NWS Eureka, CA issued this winter storm warning at Mar 23, 2018, 3:40 AM PDT for Mendocino County, Trinity County, California. It took effect at Mar 23, 2018, 10:00 AM PDT. It was in force for 5 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Mar 23, 2018, 3:40 AM PDT (10:40 UTC)
- In effect from
- Mar 23, 2018, 10:00 AM PDT
- Expired
- Mar 23, 2018, 2:33 PM PDT
- In force
- 5 hr
- Issued by
- NWS Eureka, CA
Counties Mendocino County, CA, Trinity County, CA
The nearest sounding before it
Medford/Jackson, OR (KMFR), launched 00:00Z, 10.7 hours before the alert went out and 262 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
- 1773 m above ground
- 0-6 km bulk shear
- 68 kt
- 0-1 km storm-relative helicity
- 57 m²/s²
- 0-3 km storm-relative helicity
- 134 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
067 WWUS46 KEKA 231040 WSWEKA URGENT - WINTER WEATHER MESSAGE National Weather Service Eureka CA 340 AM PDT Fri Mar 23 2018 CAZ107-108-111-232100- /O.CAN.KEKA.WS.W.0003.000000T0000Z-180324T0600Z/ /O.NEW.KEKA.WS.W.0004.180323T1700Z-180324T0600Z/ Northern Trinity-Southern Trinity-Northeastern Mendocino Interior- 340 AM PDT Fri Mar 23 2018 ...WINTER STORM WARNING IN EFFECT FROM 10 AM THIS MORNING TO 11 PM PDT THIS EVENING ABOVE 2000 FEET... * WHAT...Heavy snow expected. Plan on difficult travel conditions, including during the evening commute. Total snow accumulations of 2 to 5 inches, with localized amounts up to 15 inches, are expected. * WHERE...Northern Trinity, Southern Trinity and Northeastern Mendocino County Interior. Highways impacted include 299, 3 and 36. * WHEN...Late this morning through this evening. Snowfall rates will increase during the day and peak by this evening. Snow levels will rise to 3000 feet this afternoon. Additional snow is expected on Saturday. * ADDITIONAL DETAILS...Slow down, allow extra time and be prepared for changing conditions. Check the latest forecasts and call 1-800-427-7623 for current road conditions and chain requirements before traveling. Be alert for rock slides in mountainous terrain. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Storm Warning for snow means severe winter weather conditions are expected. If you must travel, keep an extra flashlight, food and water in your vehicle in case of an emergency. If driving, slow down. Allow extra time and be prepared for changing conditions. Check the latest forecasts and call 1-800-427-7623 for current road conditions and chain requirements before traveling. Be alert for rock slides in mountainous terrain. For a detailed view of the hazard area visit: http://www.wrh.noaa.gov/map/?wfo=eka && $$ CAZ102-105-106-232100- /O.CON.KEKA.WS.W.0003.000000T0000Z-180324T0600Z/ Del Norte Interior-Northern Humboldt Interior- Southern Humboldt Interior- 340 AM PDT Fri Mar 23 2018 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 11 PM PDT THIS EVENING ABOVE 2000 FEET... * WHAT...Heavy snow occurring. Plan on difficult travel conditions, including during the evening commute. Additional snow accumulations of 6 to 8 inches, with localized amounts up to 18 inches, are expected. * WHERE...Del Norte Interior, Northern Humboldt Interior and Southern Humboldt County Interior. Highways impacted include 299, 36 and 199. * WHEN...This morning through this evening. Snowfall rates will increase during the day and peak by this evening. Snow levels will rise to 3000 feet this afternoon. Additional snow is expected on Saturday. * ADDITIONAL DETAILS...Slow down, allow extra time and be prepared for changing conditions. Check the latest forecasts and call 1-800-427-7623 for current road conditions and chain requirements before traveling. Be alert for rock slides in mountainous terrain. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Storm Warning for snow means severe winter weather conditions are occurring. If you must travel, keep an extra flashlight, food and water in your vehicle in case of an emergency. If driving, slow down. Allow extra time and be prepared for changing conditions. Check the latest forecasts and call 1-800-427-7623 for current road conditions and chain requirements before traveling. Be alert for rock slides in mountainous terrain. For a detailed view of the hazard area visit: http://www.wrh.noaa.gov/map/?wfo=eka && $$
3 follow-up statements
284 WWUS46 KEKA 231534 WSWEKA URGENT - WINTER WEATHER MESSAGE National Weather Service Eureka CA 834 AM PDT Fri Mar 23 2018 CAZ102-105-106-231645- /O.CAN.KEKA.WS.W.0003.000000T0000Z-180324T0600Z/ Del Norte Interior-Northern Humboldt Interior- Southern Humboldt Interior- 834 AM PDT Fri Mar 23 2018 ...WINTER STORM WARNING IS CANCELLED... $$ CAZ111-231645- /O.CAN.KEKA.WS.W.0004.180323T1700Z-180324T0600Z/ Northeastern Mendocino Interior- 834 AM PDT Fri Mar 23 2018 ...WINTER STORM WARNING IS CANCELLED... $$ CAZ107-108-232345- /O.CON.KEKA.WS.W.0004.180323T1700Z-180324T0600Z/ Northern Trinity-Southern Trinity- 834 AM PDT Fri Mar 23 2018 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 11 PM PDT THIS EVENING ABOVE 2000 FEET... * WHAT...Heavy snow expected. Plan on difficult travel conditions, including during the evening commute. Total snow accumulations of 2 to 5 inches, with localized amounts up to 12 inches, are expected. * WHERE...Trinity County. Highways impacted include Hwy 299, 3, and 36. * WHEN...10 AM to 11 PM today. * ADDITIONAL DETAILS...Slow down, allow extra time and be prepared for changing conditions. Check the latest forecasts and call 1-800-427-7623 for current road conditions and chain requirements before traveling. Be alert for rock slides in mountainous terrain. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Storm Warning for snow means severe winter weather conditions are expected. If you must travel, keep an extra flashlight, food and water in your vehicle in case of an emergency. If driving, slow down. Allow extra time and be prepared for changing conditions. Check the latest forecasts and call 1-800-427-7623 for current road conditions and chain requirements before travelling. Be alert for rock slides in mountainous terrain. For a detailed view of the hazard area visit: http://www.wrh.noaa.gov/map/?wfo=eka && $$
697 WWUS46 KEKA 231751 WSWEKA URGENT - WINTER WEATHER MESSAGE National Weather Service Eureka CA 1051 AM PDT Fri Mar 23 2018 CAZ107-108-240200- /O.CON.KEKA.WS.W.0004.000000T0000Z-180324T0600Z/ Northern Trinity-Southern Trinity- 1051 AM PDT Fri Mar 23 2018 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 11 PM PDT THIS EVENING ABOVE 2000 FEET... * WHAT...Heavy snow expected. Plan on difficult travel conditions, including during the evening commute. Total snow accumulations near 5 inches, with localized amounts up to 12 inches, are expected. * WHERE...Trinity County. Highways impacted include Hwy 299, 3, and 36. * WHEN...10 AM to 11 PM today. * ADDITIONAL DETAILS...Slow down, allow extra time and be prepared for changing conditions. Check the latest forecasts and call 1-800-427-7623 for current road conditions and chain requirements before traveling. Be alert for rock slides in mountainous terrain. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Storm Warning for snow means severe winter weather conditions are occurring. If you must travel, keep an extra flashlight, food and water in your vehicle in case of an emergency. If driving, slow down. Allow extra time and be prepared for changing conditions. Check the latest forecasts and call 1-800-427-7623 for current road conditions and chain requirements before travelling. Be alert for rock slides in mountainous terrain. For a detailed view of the hazard area visit: http://www.wrh.noaa.gov/map/?wfo=eka && $$ CAZ102-105-106-240200- /O.NEW.KEKA.WW.Y.0010.180324T0000Z-180324T0900Z/ Del Norte Interior-Northern Humboldt Interior- Southern Humboldt Interior- 1051 AM PDT Fri Mar 23 2018 ...WINTER WEATHER ADVISORY IN EFFECT FROM 5 PM THIS AFTERNOON TO 2 AM PDT SATURDAY ABOVE 2500 FEET... * WHAT...Snow expected. Plan on slippery road conditions, including during the evening commute. Total snow accumulations of 2 to 4 inches, with localized amounts up to 7 inches, are expected. * WHERE...Del Norte Interior, Northern Humboldt Interior and Southern Humboldt County Interior. Highways impacted include Hwy 299, 199, and 36. * WHEN...5 PM today to 2 AM Saturday. * ADDITIONAL DETAILS...Slow down, allow extra time and be prepared for changing conditions. Check the latest forecasts and call 1-800-427-7623 for current road conditions and chain requirements before traveling. Be alert for rock slides in mountainous terrain. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory for snow means periods of snow will cause primarily travel difficulties. Be prepared for snow covered roads and limited visibilities, and use caution while driving. For a detailed view of the hazard area visit: http://www.wrh.noaa.gov/map/?wfo=eka && $$
372 WWUS46 KEKA 232133 WSWEKA URGENT - WINTER WEATHER MESSAGE National Weather Service Eureka CA 233 PM PDT Fri Mar 23 2018 CAZ107-108-240545- /O.CAN.KEKA.WS.W.0004.000000T0000Z-180324T0600Z/ /O.NEW.KEKA.WS.A.0005.180324T1800Z-180325T1200Z/ /O.EXB.KEKA.WW.Y.0010.180324T0000Z-180324T1200Z/ Northern Trinity-Southern Trinity- 233 PM PDT Fri Mar 23 2018 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL 5 AM PDT SATURDAY ABOVE 2000 FEET... ...WINTER STORM WATCH IN EFFECT FROM SATURDAY MORNING THROUGH LATE SATURDAY NIGHT ABOVE 2000 FEET... * WHAT...Snow expected above 2000 feet. Plan on slippery road conditions. Above 2000 feet, total snow accumulations of 2 to 4 inches during Friday night, with localized amounts up to 8 inches, are expected. Additional snow accumulations from 5 to 8 inches will be possible during Saturday. * WHERE...Trinity County. Highways impacted include Hwy 299, 36, and 3. * WHEN...For the Winter Weather Advisory, 5 PM today to 5 AM Saturday. For the Winter Storm Watch, from Saturday morning through late Saturday night. * ADDITIONAL DETAILS...Slow down, allow extra time and be prepared for changing conditions. Check the latest forecasts and call 1-800-427-7623 for current road conditions and chain requirements before traveling. Be alert for rock slides in mountainous terrain. Slow down, allow extra time and be prepared for changing conditions. Check the latest forecasts and call 1- 800-427-7623 for current road conditions and chain requirements before traveling. Be alert for rock slides in mountainous terrain. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory for snow means periods of snow will cause primarily travel difficulties. Be prepared for snow covered roads and limited visibilities, and use caution while driving. A Winter Storm Watch means there is potential for significant snow, sleet or ice accumulations that may impact travel. Continue to monitor the latest forecasts. For a detailed view of the hazard area visit: http://www.wrh.noaa.gov/map/?wfo=eka && $$ CAZ102-105-106-240545- /O.NEW.KEKA.WS.A.0005.180324T1800Z-180325T1200Z/ /O.EXT.KEKA.WW.Y.0010.180324T0000Z-180324T1200Z/ Del Norte Interior-Northern Humboldt Interior- Southern Humboldt Interior- 233 PM PDT Fri Mar 23 2018 ...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL 5 AM PDT SATURDAY ABOVE 2000 FEET... ...WINTER STORM WATCH IN EFFECT FROM SATURDAY MORNING THROUGH LATE SATURDAY NIGHT ABOVE 2000 FEET... * WHAT...Snow expected above 2000 feet. Plan on slippery road conditions. Above 2000 feet, total snow accumulations of 2 to 4 inches during Friday night, with localized amounts up to 8 inches, are expected. Additional snow accumulations from 5 to 8 inches will be possible during Saturday. * WHERE...Del Norte Interior, Northern Humboldt Interior and Southern Humboldt County Interior. Highways impacted include Hwy 199, 299, 36, and 96. * WHEN...For the Winter Weather Advisory, 5 PM today to 5 AM Saturday. For the Winter Storm Watch, from Saturday morning through late Saturday night. * ADDITIONAL DETAILS...Slow down, allow extra time and be prepared for changing conditions. Check the latest forecasts and call 1-800-427-7623 for current road conditions and chain requirements before traveling. Be alert for rock slides in mountainous terrain. Slow down, allow extra time and be prepared for changing conditions. Check the latest forecasts and call 1- 800-427-7623 for current road conditions and chain requirements before traveling. Be alert for rock slides in mountainous terrain. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory for snow means periods of snow will cause primarily travel difficulties. Be prepared for snow covered roads and limited visibilities, and use caution while driving. A Winter Storm Watch means there is potential for significant snow, sleet or ice accumulations that may impact travel. Continue to monitor the latest forecasts. For a detailed view of the hazard area visit: http://www.wrh.noaa.gov/map/?wfo=eka && $$ CAZ110-111-240545- /O.NEW.KEKA.WS.A.0005.180324T1800Z-180325T1200Z/ Northwestern Mendocino Interior-Northeastern Mendocino Interior- 233 PM PDT Fri Mar 23 2018 ...WINTER STORM WATCH IN EFFECT FROM SATURDAY MORNING THROUGH LATE SATURDAY NIGHT ABOVE 2000 FEET... * WHAT...Heavy snow possible. Plan on difficult travel conditions. Total snow accumulations of 5 to 8 inches possible during Saturday. * WHERE...Northwestern Mendocino Interior and Northeastern Mendocino County Interior. * WHEN...From Saturday morning through late Saturday night. * ADDITIONAL DETAILS...Slow down, allow extra time and be prepared for changing conditions. Check the latest forecasts and call 1-800-427-7623 for current road conditions and chain requirements before traveling. Be alert for rock slides in mountainous terrain. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Storm Watch means there is potential for significant snow, sleet or ice accumulations that may impact travel. Continue to monitor the latest forecasts. && $$
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 23, 5:39 AM PDT | Special Weather Statement | EKA | Del Norte | 36 min |
| Mar 23, 10:51 AM PDT | Winter Weather Advisory | EKA | Del Norte, Humboldt, Trinity | 18 hr |
| Mar 23, 2:33 PM PDT | Winter Storm Watch | EKA | Del Norte, Humboldt, Mendocino, Trinity | 13 hr |
Nearby
Winter Storm Warnings in California, 2018Every winter storm warning in 2018
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.