Alert archive / California / Winter Storm Warnings in 2019
Winter Storm Warning 4, NWS San Diego, CA
NWS San Diego, CA issued this winter storm warning at Feb 16, 2019, 12:30 PM PST for Riverside County, San Bernardino County, San Diego County, California. It took effect at Feb 16, 2019, 8:17 PM PST. It was in force for 30 hr. 4 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Feb 16, 2019, 12:30 PM PST (20:30 UTC)
- In effect from
- Feb 16, 2019, 8:17 PM PST
- Expired
- Feb 18, 2019, 2:39 AM PST
- In force
- 30 hr
- Issued by
- NWS San Diego, CA
Counties Riverside County, CA, San Bernardino County, CA, San Diego County, CA
The radar
The Santa Ana Mts radar (KSOX), 122 km from the middle of the area, began a volume at 20:32 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Feb 17, 5:00 PM PST | SNOW 2 | 1 Ese Palomar Mountain, CA | REPORTED AT BIRCH HILL PALOMAR ELEVATION 5700 FEET, 2 INCHES OF GRAUPEL NOT SNOW. |
| Feb 17, 7:56 PM PST | HEAVY SNOW 6 | Running Springs, CA | |
| Feb 17, 9:00 PM PST | HEAVY SNOW 6 | Big Bear City, CA | STILL SNOWING HEAVILY. 10 INCHES AT THE NEARBY RESORTS. |
| Feb 17, 10:42 PM PST | ICE STORM 1.5 | 3 Ese Palomar Mountain, CA | RIME ICE ACCUMULATING ON TREE LIMBS AND METAL OBJECTS, SOME PLACES 1.5 INCHES THICK. SEVERAL TREE BRANCHES DOWN IN NEIGHBORHOOD. THREE INCHES OF SNOW PELLETS/GRAUPEL TOTAL ON THE GROUND TODAY. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
San Diego, CA (KNKX), launched 12:00Z, 8.5 hours before the alert went out and 145 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
- 38 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 706 m above ground
- 0-6 km bulk shear
- 91 kt
- 0-1 km storm-relative helicity
- -5 m²/s²
- 0-3 km storm-relative helicity
- 133 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
265 WWUS46 KSGX 162030 WSWSGX URGENT - WINTER WEATHER MESSAGE National Weather Service SAN DIEGO CA 1230 PM PST Sat Feb 16 2019 ...WINTER STORM WARNING IN EFFECT FROM 2 PM SUNDAY THROUGH SUNDAY NIGHT... ...PERIODS OF SNOW AND STRONG WINDS IN THE MOUNTAINS INCREASING SUNDAY AFTERNOON AND EVENING... ...WINTER WEATHER ADVISORY CONTINUES THROUGH 2 PM SUNDAY... .A cold low pressure trough will bring periods of snow through Sunday night. The snow will be most widespread and heaviest from Sunday afternoon through Sunday night. Hazardous travel conditions will develop due to falling and blowing snow, along with areas of dense fog. Peak wind gusts to 60 mph are likley along the crests and desert slopes. CAZ058-170600- /O.NEW.KSGX.WS.W.0004.190217T2200Z-190218T1400Z/ /O.EXT.KSGX.WW.Y.0007.000000T0000Z-190217T2200Z/ San Diego County Mountains- Including the cities of Julian and Pine Valley 1230 PM PST Sat Feb 16 2019 ...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL 2 PM PST SUNDAY ABOVE 4000 FEET... ...WINTER STORM WARNING IN EFFECT FROM 2 PM SUNDAY TO 6 AM PST MONDAY ABOVE 4000 FEET... * WHAT...Snow occurring. Plan on difficult travel conditions. Damage to trees and power lines is possible. Total snow accumulations of 4 to 6 inches, with localized amounts up to 12 inches above 4500 feet, are expected. Strong west winds of 25 to 35 mph with gusts to 60 mph. * WHERE...The mountains, mainly above 4,000 feet elevation, but snow accumulating down to around 3,500 feet on Sunday. This may include the heavily traveled Cajon Pass, along I-8 through eastern San Diego County. * WHEN...For the Winter Storm Warning, 2 PM Sunday to 6 AM Monday. For the Winter Weather Advisory, until 2 PM Sunday. * ADDITIONAL DETAILS...Periods of snow and gusty winds through midday Sunday will increase late in the day through the evening with significant snow accumulations expected as low as 4000 feet. Be prepared for snowy or icy mountain roads and chain controls in place. travel will be hazardous at times due to reduced visibility in fog, snow and blowing snow. * The snow and wind will decrease early Monday morning. 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. For road condition information in California...enter 8 0 0 4 2 7 7 6 2 3 if inside california or 9 1 6 4 5 5 7 6 2 3 if outside California. 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 road condition information in California...enter 8 0 0 4 2 7 7 6 2 3 if inside california or 9 1 6 4 5 5 7 6 2 3 if outside California. $$ CAZ055-056-170600- /O.NEW.KSGX.WS.W.0004.190217T2200Z-190218T1100Z/ /O.EXT.KSGX.WW.Y.0007.000000T0000Z-190217T2200Z/ San Bernardino County Mountains-Riverside County Mountains- Including the cities of Crestline, Lake Arrowhead, Big Bear City, Big Bear Lake, Running Springs, Wrightwood, and Idyllwild-Pine Cove 1230 PM PST Sat Feb 16 2019 ...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL 2 PM PST SUNDAY ABOVE 4000 FEET... ...WINTER STORM WARNING IN EFFECT FROM 2 PM SUNDAY TO 3 AM PST MONDAY ABOVE 4000 FEET... * WHAT...Snow occurring. Plan on difficult travel conditions. Damage to trees and power lines is possible. Total snow accumulations of 4 to 6 inches, with localized amounts up to 12 inches, are expected. Strong winds of 25 to 35 mph with gusts to 60 mph are likley. * WHERE...The mountains, mainly above 4,000 feet elevation, but snow accumulating as low as 3,000 feet on Sunday. Freezing conditions and falling snow could result in treacherous road conditions including the heavily traveled Cajon Pass, as well as across higher portions of the high desert on Sunday. * WHEN...For the Winter Storm Warning, 2 PM Sunday to 3 AM Monday. For the Winter Weather Advisory, until 2 PM Sunday. * ADDITIONAL DETAILS...Be prepared for snowy or icy mountain roads and chain controls in place. Prepare for hazardous travel conditions at times due to the icy roads and reduced visibility in fog or blowing snow. 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. For road condition information in California...enter 8 0 0 4 2 7 7 6 2 3 if inside california or 9 1 6 4 5 5 7 6 2 3 if outside California. 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 road condition information in California...enter 8 0 0 4 2 7 7 6 2 3 if inside california or 9 1 6 4 5 5 7 6 2 3 if outside California. $$ 10
5 follow-up statements
948 WWUS46 KSGX 170417 WSWSGX URGENT - WINTER WEATHER MESSAGE National Weather Service SAN DIEGO CA 817 PM PST Sat Feb 16 2019 CAZ058-171400- /O.CAN.KSGX.WW.Y.0007.000000T0000Z-190217T2200Z/ /O.EXT.KSGX.WS.W.0004.190217T0417Z-190218T1400Z/ San Diego County Mountains- Including the cities of Julian and Pine Valley 817 PM PST Sat Feb 16 2019 ...WINTER STORM WARNING NOW IN EFFECT UNTIL 6 AM PST MONDAY... * WHAT...Heavy snow occurring. Plan on difficult travel conditions. Damage to trees and power lines is possible. Total snow accumulations of 1 to 3 inches above 3500 feet, 3 to 6 inches above 4500 feet, with isolated amounts up to 12 inches above 5500 feet. Strong west winds of 25 to 35 mph with gusts to 60 mph. * WHERE...The San Diego Mountains. Light accumulations will be possible down to 3000 feet by Sunday evening, including along I-8 east of San Diego. * WHEN...Until 6 AM Monday. * ADDITIONAL DETAILS...Scattered snow showers through midday Sunday will then increase in coverage and intensity Sunday afternoon through Sunday night. Be prepared for treacherous roads and possible travel restrictions. Fog and blowing snow will make for poor visibility. 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. For road condition information in California...enter 8 0 0 4 2 7 7 6 2 3 if inside california or 9 1 6 4 5 5 7 6 2 3 if outside California. $$ CAZ055-056-171400- /O.CAN.KSGX.WW.Y.0007.000000T0000Z-190217T2200Z/ /O.EXT.KSGX.WS.W.0004.190217T0417Z-190218T1100Z/ San Bernardino County Mountains-Riverside County Mountains- Including the cities of Crestline, Lake Arrowhead, Big Bear City, Big Bear Lake, Running Springs, Wrightwood, and Idyllwild-Pine Cove 817 PM PST Sat Feb 16 2019 ...WINTER STORM WARNING NOW IN EFFECT UNTIL 3 AM PST MONDAY... * WHAT...Heavy snow occurring. Plan on difficult travel conditions. Tree branches could fall as well. Total snow accumulations of 5 to 10 inches above 4000 feet, with isolated amounts up to 18 inches above 5000 feet. Strong winds of 25 to 35 mph with gusts to 60 mph. * WHERE...The Riverside and San Bernardino Mountains, heavy accumulations above 4000 feet elevation, with lighter accumulations down to 2500-3000 feet Sunday afternoon and Sunday night. This includes I-15 along Cajon Pass. * WHEN...Until 3 AM Monday. * ADDITIONAL DETAILS...Scattered snow showers through Sunday morning, then increase in coverage and intensity Sunday afternoon through Sunday night. Be prepared for treacherous roads and possible travel restrictions. Fog and blowing snow will make for poor visibility. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Storm Warning for snow means severe winter weather conditions are occurring. If you must travel, keep an extra flashlight, food and water in your vehicle in case of an emergency. For road condition information in California...enter 8 0 0 4 2 7 7 6 2 3 if inside california or 9 1 6 4 5 5 7 6 2 3 if outside California. $$ CAZ057-060-171400- /O.NEW.KSGX.WW.Y.0008.190217T1800Z-190218T1100Z/ Santa Ana Mountains and Foothills-Apple and Lucerne Valleys- Including the cities of Victorville, Hesperia, and Apple Valley 817 PM PST Sat Feb 16 2019 ...WINTER WEATHER ADVISORY IN EFFECT FROM 10 AM SUNDAY TO 3 AM PST MONDAY... * WHAT...Snow expected. Plan on slippery road conditions. Total snow accumulations of up to one inch, with amounts up to 4 inches along the higher slopes and foothills. Gusty west winds of 20 to 30 mph with gusts to 45 mph. * WHERE...Santa Ana Mountains and the High Desert. Snow could affect the Ortega Highway (S.R. 74) and Highway 138 between Cajon Junction and Palmdale. * WHEN...10 AM Sunday to 3 AM Monday. * ADDITIONAL DETAILS...Scattered rain showers Sunday, then mixing with snow in the afternoon. Snow accumulations mainly up to one inch, except higher amounts up to 4 inches along the higher slopes and foothills. Be prepared for slushy and slippery roads. 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 road condition information in California...enter 8 0 0 4 2 7 7 6 2 3 if inside california or 9 1 6 4 5 5 7 6 2 3 if outside California. $$ jmb
763 WWUS46 KSGX 171322 WSWSGX URGENT - WINTER WEATHER MESSAGE National Weather Service SAN DIEGO CA 522 AM PST Sun Feb 17 2019 ...SNOW AND STRONG WINDS IN THE MOUNTAINS AND HIGH DESERT... .A cold low pressure trough will bring periods of snow through early Monday. The snow will be most widespread this afternoon and evening when several inches of snow is likely above 4,000 feet. CAZ058-172200- /O.CON.KSGX.WS.W.0004.000000T0000Z-190218T1400Z/ San Diego County Mountains- Including the cities of Julian and Pine Valley 522 AM PST Sun Feb 17 2019 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 AM PST MONDAY... * WHAT...Heavy snow occurring. Plan on difficult travel conditions. Damage to trees and power lines is possible. Additional snow accumulations of 2 to 4 inches, with localized amounts up to 8 inches, are expected. * WHERE...The San Diego Mountains. Light accumulations will be possible down to 3000 feet by early Monday, including along I-8 east of Alpine. * WHEN...Until 6 AM Monday. * ADDITIONAL DETAILS...Be prepared for significant reductions in visibility at times due to fog and snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Storm Warning for snow means severe winter weather conditions are occurring. If you must travel, keep an extra flashlight, food and water in your vehicle in case of an emergency. For road condition information in California...enter 8 0 0 4 2 7 7 6 2 3 if inside california or 9 1 6 4 5 5 7 6 2 3 if outside California. $$ CAZ055-056-172200- /O.CON.KSGX.WS.W.0004.000000T0000Z-190218T1100Z/ San Bernardino County Mountains-Riverside County Mountains- Including the cities of Crestline, Lake Arrowhead, Big Bear City, Big Bear Lake, Running Springs, Wrightwood, and Idyllwild-Pine Cove 522 AM PST Sun Feb 17 2019 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 3 AM PST MONDAY... * WHAT...Heavy snow occurring. Plan on difficult travel conditions. Damage to trees and power lines is possible. Additional snow accumulations of 3 to 6 inches, with localized amounts up to 10 inches, are expected. * WHERE...The Riverside and San Bernardino Mountains, heavy accumulations above 4000 feet elevation, with lighter accumulations down to 2500-3000 feet this evening. This includes I-15 through the Cajon Pass. * WHEN...Until 3 AM Monday. * ADDITIONAL DETAILS...Be prepared for significant reductions in visibility at times due to fog and snow. 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. For road condition information in California...enter 8 0 0 4 2 7 7 6 2 3 if inside california or 9 1 6 4 5 5 7 6 2 3 if outside California. $$ CAZ057-060-172200- /O.CON.KSGX.WW.Y.0008.190217T1800Z-190218T1100Z/ Santa Ana Mountains and Foothills-Apple and Lucerne Valleys- Including the cities of Victorville, Hesperia, and Apple Valley 522 AM PST Sun Feb 17 2019 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 10 AM THIS MORNING TO 3 AM PST MONDAY... * WHAT...Snow expected. Plan on slippery road conditions. Total snow accumulations of up to one inch, with localized amounts up to 2 inches, are expected. * WHERE...Santa Ana Mountains and the High Desert. Snow could affect Highway 138 between Cajon Junction and Palmdale. * WHEN...10 AM today to 3 AM Monday. * ADDITIONAL DETAILS...Be prepared for reduced visibilities at times due to snow and fog. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory for snow means periods of snow will cause primarily travel difficulties. Be prepared for snow covered roads and limited visibilities, and use caution while driving. For road condition information in California...enter 8 0 0 4 2 7 7 6 2 3 if inside california or 9 1 6 4 5 5 7 6 2 3 if outside California. $$
165 WWUS46 KSGX 172134 WSWSGX URGENT - WINTER WEATHER MESSAGE National Weather Service SAN DIEGO CA 134 PM PST Sun Feb 17 2019 ...SNOW AND STRONG WINDS IN THE MOUNTAINS... .A cold low pressure trough will bring periods of snow through early Monday. The snow will be most widespread this evening when heavy snow accumulations are possible above 4000 feet. CAZ058-180600- /O.CON.KSGX.WS.W.0004.000000T0000Z-190218T1400Z/ San Diego County Mountains- Including the cities of Julian and Pine Valley 134 PM PST Sun Feb 17 2019 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 AM PST MONDAY... * WHAT...Heavy snow occurring. Plan on hazardous travel conditions. Damage to trees and power lines is possible due to strong westerly winds with gusts 55 to 65 mph. Snow accumulations of 4 to 10 inches, with localized amounts up to 12 inches, are expected. * WHERE...The San Diego Mountains. Light accumulations will be possible down to 3500 feet by early Monday, including along I- 8 east of Alpine. * WHEN...Until 6 AM Monday. * ADDITIONAL DETAILS...Be prepared for treacherous travel conditions with significant reductions in visibility at times in fog and blowing snow. Portions of Interstate 8 will be impacted with snow and ice. 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. For road condition information in California...enter 8 0 0 4 2 7 7 6 2 3 if inside california or 9 1 6 4 5 5 7 6 2 3 if outside California. $$ CAZ055-056-180600- /O.CON.KSGX.WS.W.0004.000000T0000Z-190218T1100Z/ San Bernardino County Mountains-Riverside County Mountains- Including the cities of Crestline, Lake Arrowhead, Big Bear City, Big Bear Lake, Running Springs, Wrightwood, and Idyllwild-Pine Cove 134 PM PST Sun Feb 17 2019 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 3 AM PST MONDAY... * WHAT...Heavy snow occurring. Plan on difficult travel conditions. Damage to trees and power lines is possible due to west winds with gusts 55 to 60 mph. Snow accumulations of 6 to 10 inches, with localized amounts up to 15 inches, are expected. * WHERE...The Riverside and San Bernardino County Mountains. * WHEN...Until 3 AM Monday. * ADDITIONAL DETAILS...Heavy accumulations above 4000 feet elevation, with 3 to 6 inches down to 3000 feet. This includes I-15 through the Cajon Pass. Be prepared for significant reductions in visibility at times due to fog and blowing snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Storm Warning for snow means severe winter weather conditions are occurring. If you must travel, keep an extra flashlight, food and water in your vehicle in case of an emergency. For road condition information in California...enter 8 0 0 4 2 7 7 6 2 3 if inside california or 9 1 6 4 5 5 7 6 2 3 if outside California. $$ CAZ057-060-180600- /O.CON.KSGX.WW.Y.0008.000000T0000Z-190218T1100Z/ Santa Ana Mountains and Foothills-Apple and Lucerne Valleys- Including the cities of Victorville, Hesperia, and Apple Valley 134 PM PST Sun Feb 17 2019 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 3 AM PST MONDAY... * WHAT...Snow occurring. Plan on slippery road conditions. Additional snow accumulations of up to one inch, with localized amounts up to 3 inches, are expected. * WHERE...Santa Ana Mountains and the High Desert. Snow could affect Highway 138 between Cajon Junction and Palmdale. * WHEN...Until 3 AM Monday. * ADDITIONAL DETAILS...Watch for icy patches on roadways, even if no snow is falling as these showers could move through quickly. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory for snow means periods of snow will cause primarily travel difficulties. Be prepared for icy roads and use caution while driving. For road condition information in California...enter 8 0 0 4 2 7 7 6 2 3 if inside california or 9 1 6 4 5 5 7 6 2 3 if outside California. $$ 10
471 WWUS46 KSGX 180551 WSWSGX URGENT - WINTER WEATHER MESSAGE National Weather Service SAN DIEGO CA 951 PM PST Sun Feb 17 2019 ...SNOW AND STRONG WINDS IN THE MOUNTAINS... .A cold low pressure trough will bring periods of snow through early Monday. The snow will be most widespread this evening when heavy snow accumulations are possible above 4000 feet. CAZ058-181400- /O.CON.KSGX.WS.W.0004.000000T0000Z-190218T1400Z/ San Diego County Mountains- Including the cities of Julian and Pine Valley 951 PM PST Sun Feb 17 2019 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 6 AM PST MONDAY... * WHAT...Heavy snow occurring. Plan on hazardous travel conditions. Damage to trees and power lines is possible due to strong westerly winds with gusts 55 to 65 mph. Snow accumulations of 4 to 10 inches, with localized amounts up to 12 inches, are expected. * WHERE...The San Diego Mountains. Light accumulations will be possible down to 3500 feet by early Monday, including along I- 8 east of Alpine. * WHEN...Until 6 AM Monday. * ADDITIONAL DETAILS...Be prepared for treacherous travel conditions with significant reductions in visibility at times in fog and blowing snow. Portions of Interstate 8 will be impacted with snow and ice. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Storm Warning for snow means severe winter weather conditions are occurring. If you must travel, keep an extra flashlight, food and water in your vehicle in case of an emergency. For road condition information in California...enter 8 0 0 4 2 7 7 6 2 3 if inside california or 9 1 6 4 5 5 7 6 2 3 if outside California. $$ CAZ055-056-181100- /O.CON.KSGX.WS.W.0004.000000T0000Z-190218T1100Z/ San Bernardino County Mountains-Riverside County Mountains- Including the cities of Crestline, Lake Arrowhead, Big Bear City, Big Bear Lake, Running Springs, Wrightwood, and Idyllwild-Pine Cove 951 PM PST Sun Feb 17 2019 ...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 3 AM PST MONDAY... * WHAT...Heavy snow occurring. Plan on difficult travel conditions. Damage to trees and power lines is possible due to west winds with gusts 55 to 60 mph. Total snow accumulations of 6 to 12 inches, with localized amounts up to 18 inches, are expected. * WHERE...The Riverside and San Bernardino County Mountains. * WHEN...Until 3 AM Monday. * ADDITIONAL DETAILS...Heavy accumulations above 4000 feet elevation, with 3 to 6 inches down to 3000 feet. This includes I- 15 through the Cajon Pass. Be prepared for significant reductions in visibility at times due to fog and blowing snow. 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. For road condition information in California...enter 8 0 0 4 2 7 7 6 2 3 if inside california or 9 1 6 4 5 5 7 6 2 3 if outside California. $$ CAZ057-060-181100- /O.CON.KSGX.WW.Y.0008.000000T0000Z-190218T1100Z/ Santa Ana Mountains and Foothills-Apple and Lucerne Valleys- Including the cities of Victorville, Hesperia, and Apple Valley 951 PM PST Sun Feb 17 2019 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 3 AM PST MONDAY... * WHAT...Snow occurring. Plan on slippery road conditions. Additional snow accumulations of up to one inch, with localized amounts up to 3 inches, are expected. * WHERE...Santa Ana Mountains and the High Desert. Snow could affect Highway 138 between Cajon Junction and Palmdale. * WHEN...Until 3 AM Monday. * ADDITIONAL DETAILS...Watch for icy patches on roadways, even if no snow is falling as these showers could move through quickly. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory for snow means periods of snow will cause primarily travel difficulties. Be prepared for snow covered roads and limited visibilities, and use caution while driving. For road condition information in California...enter 8 0 0 4 2 7 7 6 2 3 if inside california or 9 1 6 4 5 5 7 6 2 3 if outside California. $$ jmb
780 WWUS46 KSGX 181039 WSWSGX URGENT - WINTER WEATHER MESSAGE National Weather Service San Diego CA 239 AM PST Mon Feb 18 2019 CAZ058-181400- /O.CAN.KSGX.WS.W.0004.000000T0000Z-190218T1400Z/ /O.NEW.KSGX.WS.W.0005.190218T1100Z-190218T1400Z/ San Diego County Mountains- Including the cities of Julian and Pine Valley 239 AM PST Mon Feb 18 2019 ...WINTER STORM WARNING IN EFFECT UNTIL 6 AM PST EARLY THIS MORNING... The National Weather Service in San Diego has issued a Winter Storm Warning...which is in effect until 6 AM PST early this morning. * WHAT...Heavy snow occurring. Plan on hazardous travel conditions. Local additional snowfall of 1 to 2 inches, mainly from Julian southward. Total snowfall of 4 to 10 inches, mainly above 4000 feet. * WHERE...The San Diego Mountains above 4000 feet. Light accumulations will be possible down to 3500 feet. * WHEN...Until 6 AM Today. * ADDITIONAL DETAILS...Be prepared for difficult travel conditions. The Sunrise Highway and portions of Interstate 8 will be impacted with snow and ice. 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. For road condition information in California...enter 8 0 0 4 2 7 7 6 2 3 if inside california or 9 1 6 4 5 5 7 6 2 3 if outside California. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Storm Warning for heavy snow means severe winter weather conditions are expected or occurring. Significant amounts of snow are forecast that will make travel dangerous. Only travel in an emergency. If you must travel...keep an extra flashlight... food...and water in your vehicle in case of an emergency. && $$ CAZ055-056-181145- /O.CAN.KSGX.WS.W.0004.000000T0000Z-190218T1100Z/ San Bernardino County Mountains-Riverside County Mountains- 239 AM PST Mon Feb 18 2019 ...WINTER STORM WARNING IS CANCELLED... The National Weather Service in San Diego has cancelled the Winter Storm Warning. A few snow showers will continue until around sunrise with additional snow accumulations of 1 inch or less. $$ CAZ057-060-181145- /O.CAN.KSGX.WW.Y.0008.000000T0000Z-190218T1100Z/ Santa Ana Mountains and Foothills-Apple and Lucerne Valleys- 239 AM PST Mon Feb 18 2019 ...WINTER WEATHER ADVISORY IS CANCELLED... The National Weather Service in San Diego has cancelled the Winter Weather Advisory. A few additional snow showers will continue across the Apple and Lucerne Valleys until around sunrise with snow accumulation of 1 inch or less. $$ 17
What forecasters said that day
The local office's own words before this winter storm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS San Diego, CA wrote its last area forecast discussion before this winter storm warning went out at Feb 16, 8:35 AM PST, 3 hours 55 minutes earlier.
Area forecast discussion, Feb 16, 8:35 AM PST, 3 hours 55 minutes before
Area Forecast Discussion
National Weather Service San Diego CA
835 AM PST Sat Feb 16 2019
.SYNOPSIS...
A weak low pressure trough may generate a few showers over and west
of the mountains through this evening. A stronger, colder storm
system on Sunday will bring a period of widespread showers over the
coast and valleys, with snow in the mountains down to 3000 feet.
Monday through Wednesday will be dry and quite cold. Another cold
winter storm will bring a chance for more widespread and heavier
precipitation Thursday into Friday.
&&
.DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...
At 8 AM PST...Skies were mostly clear over O.C and the Riverside
County portion of the I.E., while partly cloudy conditions prevailed
over western San Diego County and extreme SW San Bernardino County.
Heavier cloud cover was backed up against the coastal foothills and
mtn slopes. Some weak low-level instability was noted on the 12Z
Miramar sounding with a low PW of 0.47 inch. Of perhaps more
interest are the winds...Something we don't see too often are winds
exceeding 150 KTS on our sounding. This morning peak is west at 164
KTS at 40K FT. Closer to the sfc...moderate onshore pressure
gradients were supporting gusty westerly winds near the passes and on
the desert slope areas. Peak gusts were 45-50 MPH in these areas.
Expect more cumulus to form during the day with heating of the sfc,
otherwise just a few light showers are possible in the mts. No
forecast changes.
From previous discussion...
A long wave trough will deepen over the West as shortwaves drive
progressively colder air into the Southwest through Monday. A
shortwave that brought rain and mountain snow last night is moving
east this morning. A precip summary is headlined on our webpage.
The second wave is weaker, but still has enough moisture for
isolated showers today and tonight. The precip will primarily fall
over the mountains and foothills, but a few showers west of the
mountains can't be ruled out.
On Sunday a stronger shortwave will bring rain and mountain snow
from midday through the evening. Ingredients are coming together
to make this a moderate to high impact winter storm. Sunday will
be a cold, windy day in all areas. Strong PVA aloft and surface
forcing along and ahead of the cold front will interact with a
modest moisture surge from the west (PW of 0.65") to generate
showers and mountains snow squalls at times. 700mb temps fall to
-11C, and 850 mb temps fall to -2C which will lower snow levels
to between 3,000 and 3,500 feet. Snow accumulations in the
mountains above 4,000 feet will range from 4-8" with as much as
12" at the higher elevations. The highest amounts are mostly
likely in Riverside and San Diego Counties where strong westerly
onshore flow will maximize the orographic potential. The Winter
Weather Advisory may need to be upgraded to a Winter Storm Warning
Sunday.
The storm clears the area Sunday night. Monday and Tuesday will
be dry with cool days and cold nights. Overnight lows will fall
below freezing in the inland valleys and low lying coastal areas.
Frost or Freeze products may be needed.
Clouds increase Wednesday ahead of another strong shortwave in the
cold northerly flow aloft. This systems lacks the deep moisture, but
it's another very cold system that will wring out convective showers
Thursday. Snow levels will once again be very low.
Friday through Sunday: A pattern change may be forthcoming as the
00Z GFS and ECMWF show a transition from a high amplitude
ridge/trough wave pattern to more zonal westerly flow over the
weekend. If this were to materialize we would see temperatures
moderating back to near normal for the last days of February.
&&
.AVIATION...
161015Z...Coast/Valleys...FEW low clouds with variable bases 3000-
5000 ft MSL through this afternoon. Moderate confidence in cigs
returning to KSAN/KCRQ after 17/01Z with bases near 3000 FT and tops
to 6000 FT. Periods of BKN cigs possible at KONT/KSBD, mainly after
17/06Z. Areas of -SHRA possible in the valleys after 17/04Z. Strong
WNW SFC winds through 03Z, with gusts to 25 kts possible at the
terminals.
Mountains/Deserts...SCT-BKN cigs through the period in the
mountains, remaining mostly clear in the deserts. Higher terrain
will be obscured at times with vis locally down to 3-5 mi. Areas of
-SHRA after 17/04Z, most likely for San Diego County mountains.
Strong W winds with SFC gusts 30-45 kt near ridges and desert slopes
this evening into early Sunday. MOD UDDFS and areas of LLWS likely
over and east of the mountains through Sunday.
&&
.MARINE...
Gusty WNW winds will continue through Monday morning, with peak
gusts around 30 kt, or locally even approaching gale force this
evening and Sunday evening. A combination of steep wind waves and a
mix of westerly swells will result in choppy seas. A Small Craft
Advisory is in effect through 10 AM Monday. Winds and waves will
lower through the day Monday.
&&
.BEACHES...
A new west-northwest swell of around 10-12 FT/8-9 sec from 290
degrees will generate elevated surf through Sunday, mainly in
southern San Diego County where sets of around 8 FT are possible. A
Beach Hazards Statement remains in effect for elevated surf and
strong rip currents through Sunday afternoon.
&&
.SKYWARN...
Skywarn activation may be needed on Sunday afternoon for snow and
impacts in the mts.
&&
.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Winter Weather Advisory until 2 AM PST Monday for Riverside
County Mountains-San Bernardino County Mountains-San Diego
County Mountains.
Beach Hazards Statement through Sunday afternoon for Orange
County Coastal Areas-San Diego County Coastal Areas.
PZ...Small Craft Advisory until 10 AM PST Monday for Coastal Waters
from San Mateo Point to the Mexican Border and out to 30 nm-
Waters from San Mateo point to the Mexican Border Extending
30 to 60 nm out including San Clemente Island.
&&
PUBLIC...10/Moede
AVIATION/MARINE/BEACHES...RodriguezThe office that day
Everything else NWS San Diego, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 16, 1:26 PM PST | Gale Warning | SGX | 37 hr |
Nearby
Winter Storm Warnings in California, 2019Every winter storm warning in 2019
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.