Alert archive / California / Winter Storm Warnings in 2017
Winter Storm Warning 7, NWS Eureka, CA
NWS Eureka, CA issued this winter storm warning at Nov 16, 2017, 3:20 PM PST for Del Norte County, Humboldt County, California. It took effect at Nov 16, 2017, 4:00 PM PST. It was in force for 50 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Nov 16, 2017, 3:20 PM PST (23:20 UTC)
- In effect from
- Nov 16, 2017, 4:00 PM PST
- Expired
- Nov 16, 2017, 4:50 PM PST
- In force
- 50 min
- Issued by
- NWS Eureka, CA
Counties Del Norte County, CA, Humboldt County, CA
The radar
The Eureka (Bunker Hill) radar (KBHX), 86 km from the middle of the area, began a volume at 23:20 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, 11.3 hours before the alert went out and 158 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
- 757 m above ground
- 0-6 km bulk shear
- 101 kt
- 0-1 km storm-relative helicity
- 10 m²/s²
- 0-3 km storm-relative helicity
- 248 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
926 WWUS46 KEKA 162320 WSWEKA URGENT - WINTER WEATHER MESSAGE National Weather Service Eureka CA 320 PM PST Thu Nov 16 2017 CAZ102-105-170730- /O.NEW.KEKA.WS.W.0001.171117T0000Z-171117T1200Z/ Del Norte Interior-Northern Humboldt Interior- 320 PM PST Thu Nov 16 2017 ...WINTER STORM WARNING IN EFFECT UNTIL 4 AM FRIDAY... * WHAT...Heavy wet snow expected. Plan on difficult travel conditions. Total wet snow accumulations of up to two inches, with localized amounts up to 8 inches, are expected. * WHERE...Del Norte Interior and Northern Humboldt Interior County. * WHEN...4 PM today to 4 AM Friday. * ADDITIONAL DETAILS...Look for significant reductions in visibility at times. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Storm Warning for wet 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 $$ CAZ107-108-170730- /O.NEW.KEKA.WW.Y.0001.171117T0000Z-171117T1200Z/ Northern Trinity-Southern Trinity- 320 PM PST Thu Nov 16 2017 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL 4 AM FRIDAY... * WHAT...Snow expected. Plan on slippery road conditions, including during the evening commute. Total snow accumulations of up to two inches, with localized amounts up to 5 inches, are expected. * WHERE...Northern Trinity and Southern Trinity County. * WHEN...4 PM today to 4 AM Friday. * ADDITIONAL DETAILS...Look for reduced visibilities at times. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory for snow means periods of snow will cause primarily travel difficulties. Be prepared for snow covered roads and limited visibilities, and use caution while driving. For a detailed view of the hazard area visit: http://www.wrh.noaa.gov/map/?wfo=eka $$
2 follow-up statements
418 WWUS46 KEKA 162355 CCA WSWEKA URGENT - WINTER WEATHER MESSAGE...CORRECTED National Weather Service Eureka CA 355 PM PST Thu Nov 16 2017 CAZ102-105-170730- /O.COR.KEKA.WS.W.0001.171117T0000Z-171117T1200Z/ Del Norte Interior-Northern Humboldt Interior- 355 PM PST Thu Nov 16 2017 ...WINTER STORM WARNING IN EFFECT UNTIL 4 AM FRIDAY FOR ELEVATIONS ABOVE 3500 FEET... * WHAT...Heavy wet snow expected. Plan on difficult travel conditions. Total wet snow accumulations of up to two inches, with localized amounts up to 8 inches, are expected. * WHERE...Del Norte Interior and Northern Humboldt Interior County above 3500 feet. * WHEN...4 PM today to 4 AM Friday. * ADDITIONAL DETAILS...Look for significant reductions in visibility at times. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Storm Warning for wet 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 travailing. 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 $$ CAZ107-108-170730- /O.COR.KEKA.WW.Y.0001.171117T0000Z-171117T1200Z/ Northern Trinity-Southern Trinity- 355 PM PST Thu Nov 16 2017 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL 4 AM FRIDAY FOR ELEVATIONS ABOVE 3500 FEET... * WHAT...Snow expected. Plan on slippery road conditions, including during the evening commute. Total snow accumulations of up to two inches, with localized amounts up to 5 inches, are expected. * WHERE...Trinity County above 3500 feet. * WHEN...4 PM today to 4 AM Friday. * ADDITIONAL DETAILS...Look for reduced visibilities at times. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory for snow means periods of snow will cause primarily travel difficulties. Be prepared for snow covered roads and limited visibilities, and use caution while driving. For a detailed view of the hazard area visit: http://www.wrh.noaa.gov/map/?wfo=eka $$
472 WWUS46 KEKA 170050 WSWEKA URGENT - WINTER WEATHER MESSAGE National Weather Service Eureka CA 450 PM PST Thu Nov 16 2017 CAZ102-105-170900- /O.CAN.KEKA.WS.W.0001.000000T0000Z-171117T1200Z/ /O.EXA.KEKA.WW.Y.0001.000000T0000Z-171117T1200Z/ Del Norte Interior-Northern Humboldt Interior- 450 PM PST Thu Nov 16 2017 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL 4 AM PST FRIDAY ABOVE 3500 FEET... ...WINTER STORM WARNING IS CANCELLED... * WHAT...Snow occurring. Plan on slippery road conditions, including during the evening commute. Additional snow accumulations of 2 to 4 inches, with localized amounts up to 7 inches, are expected. * WHERE...Del Norte Interior and Northern Humboldt Interior County. * WHEN...Until 4 AM Friday. * ADDITIONAL DETAILS...Look for reduced visibilities at times with heavy snow showers. 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 && $$ CAZ107-108-170900- /O.CON.KEKA.WW.Y.0001.000000T0000Z-171117T1200Z/ Northern Trinity-Southern Trinity- 450 PM PST Thu Nov 16 2017 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 4 AM PST FRIDAY ABOVE 3500 FEET... * WHAT...Snow occurring. Plan on slippery road conditions, including during the evening commute. Additional snow accumulations of up to 2 inches, with localized amounts up to 4 inches, are expected. * WHERE...Northern Trinity and Southern Trinity County. * WHEN...Until 4 AM Friday. * ADDITIONAL DETAILS...Look for reduced visibilities at times with heavy snow showers. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory for snow means periods of snow will cause primarily travel difficulties. Be prepared for snow covered roads and limited visibilities, and use caution while driving. For a detailed view of the hazard area visit: http://www.wrh.noaa.gov/map/?wfo=eka && $$
The office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 15, 7:05 PM PST | Gale Warning | EKA | 3 hr | |
| Nov 15, 7:05 PM PST | Small Craft Advisory | EKA | 20 hr | |
| Nov 16, 8:14 AM PST | Small Craft Advisory | EKA | 7 hr | |
| Nov 16, 3:20 PM PST | Winter Weather Advisory | EKA | Del Norte, Humboldt, Trinity | 12 hr |
Nearby
Winter Storm Warnings in California, 2017Every winter storm warning in 2017
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.