janetjanet998 Posted January 3, 2017 Share Posted January 3, 2017 an endless parade of storms on the way WPC has up to 25 inches of precip in the CA mountains next 7 days first storm to prime the area today... DAY 1 NORTHERN TO CENTRAL CALIFORNIA THE CLOSED LOW OFF THE WASHINGTON/OREGON COAST EXPECTED TO MOVE LITTLE DURING THE UPCOMING DAY 1 TIME PERIOD. A SURGE OF ABOVE AVERAGE PW VALUES---2.0 TO 2.5 STANDARD DEVIATIONS ABOVE THE MEAN---EXPECTED TO PUSH EAST NORTHEASTWARD IN THE WEST SOUTHWEST MID TO UPPER LEVEL FLOW TO THE SOUTH OF THIS CLOSED LOW---INITIATING AN ATMOSPHERIC RIVER EVENT THIS PERIOD FOR NORTHERN TO CENTRAL CALIFORNIA. THIS WILL SUPPORT INCREASING HEAVY PRECIPITATION FOR MOST OF CENTRAL TO NORTHERN CALIFORNIA DAY 1---WITH 1 TO 3 INCH AMOUNTS IN THE NORTHERN TO CENTRAL CALIFORNIA COAST RANGE---WHILE 3 TO 5 INCH LIQUID EQUIVALENTS ARE EXPECTED THROUGH THE SIERRA. VERY HEAVY SNOWS LIKELY IN THE SIERRA WITH 1 TO 3 FOOT AMOUNTS DAY 1 AND ADDITIONAL VERY HEAVY TOTALS LIKELY DAY 2. AYS 2 AND 3... ..CA INTO THE CENTRAL GREAT BASIN/ROCKIES AN EXTREMELY WET ANOMALOUS PATTERN IS BEGINNING TO TAKE SHAPE FOR CA AND SPREADING DOWNSTREAM INTO THE CENTRAL GREAT BASIN AND ROCKIES. AN IMPRESSIVE CLOSED POLAR/ARCTIC UPPER LOW NEAR COASTAL WA/OR WILL SLOWLY PRESS SOUTH AND EAST ON WED BEFORE FLATTENING OR SHEARING-OUT SOME TO REACH THE FOUR CORNERS STATES BY FRI MORNING. MEANWHILE UPSTREAM OVER THE EAST CENTRAL PAC... AN EXTREMELY DYNAMIC CLOSED LOW IS PRESENT WITH A COPIOUS AMOUNT OF MOISTURE AVAILABLE. AS THE FEATURE NEAR WA/OR PRESSES SOUTH ON WED... A PIECE OF UPPER DYNAMICS FROM THIS PAC SYSTEM ADVECTS DOWNSTREAM TOWARD CA. GFS AND ECMWF 850-700MB STANDARDIZED MOISTURE FLUX ANOMALIES WILL REACH 4 TO 5 TIMES ABOVE AVG ON WED WITHIN THIS MOISTURE WRLY FLOW OF PAC AND SUBTROPICAL MOISTURE. THE RESULT WILL BE VERY IMPRESSIVE RAINFALL AND SNOWFALL AMOUNTS FOR CA AND SPREADING DOWNSTREAM INTO THE CENTRAL GREAT BASIN AND FOUR CORNERS REGION. WPC FOLLOWED A BLEND OF THE GFS/ECMWF THROUGHOUT THE FCST FOR QPF... SUGGESTING 2 TO 4 INCHES ALONG COASTAL RANGES FROM SOUTH OF SFO TO SBA AND 3 TO 6 INCHES WITH LOCALLY HIGHER AMOUNTS ALONG THE ENTIRE SIERRA... WHERE MUCH OF THIS WILL BE IN THE FORM OF HEAVY SNOW ACCUMULATIONS. THE MOIST FLOW WILL ADVANCE DOWNSTREAM WITH THE SHORT WAVE DIGGING INTO THE FOUR CORNERS REGION ON THURS AND EXPECT HEAVY QPF FROM THE WASATCH TO THE CO ROCKIES AND SAN JUANS. Link to comment Share on other sites More sharing options...
janetjanet998 Posted January 4, 2017 Author Share Posted January 4, 2017 SFO OVERALL, RAINFALL WILL BE DECREASING NORTH TO SOUTH LATER TODAY AND INTO THE EVENING HOURS. HOWEVER, THE BREAK WILL BE BRIEF AS A WEAK SECONDARY WAVE THEN MOVES ACROSS TONIGHT INTO THURSDAY. MODELS ARE IN FAIRLY POOR AGREEMENT ALTHOUGH THE NAM CONTINUES TO INDICATE THE POTENTIAL FOR ANOTHER ROUND OF MODERATE TO EVEN HEAVY RAINFALL IN THE SANTA LUCIAS. THAT RAINFALL SHOULD BE THROUGH BY MID-AFTERNOON WITH CLEARING CONDITIONS LIKELY BY THURSDAY NIGHT. THIS WILL LEAD TO A SUBSTANTIAL DROP IN TEMPERATURES FOR FRIDAY MORNING WITH MANY LOWS GETTING INTO THE 30S. FREEZING CONDITIONS ARE POSSIBLE OVER PORTIONS OF THE NORTH BAY. FRIDAY WILL ALSO BE THE ONLY DRY DAY FOR THE WEEK. STARTING ON SATURDAY ANOTHER ATMOSPHERIC RIVER SETUP OF MUCH GREATER CONCERN WILL BRING WIDESPREAD RAINFALL TO OUR REGION. MODELS HAVE BEEN HIGHLIGHTING THE WEEKEND INTO MONDAY FOR MULTIPLE DAYS NOW AS AN AREA OF CONCERN. PW VALUES IN EXCESS OF 1.30" ALONG WITH IVT VALUES POSSIBLY ABOVE AN INCREDIBLE 1000 KG/M/S WILL BE ALONG OUR COAST FOR AROUND 48 HOURS. DURING THAT TIME MODERATE TO HEAVY RAIN WILL BLANKET OUR REGION WITH VERY HIGH RAINFALL AMOUNTS LIKELY. EARLY GUIDANCE INDICATES THE POTENTIAL FOR MANY URBAN AREA PICKING UP 2 TO 5 INCHES WITH MUCH HIGHER AMOUNTS LIKELY FOR LOCAL HILLS AND MOUNTAINS. SIMILAR TO LAST NIGHT, GUSTY SOUTH TO SOUTHEAST WINDS CAN ALSO BE EXPECTED. 924 MB SPEEDS ARE FORECAST TO AGAIN BE AROUND 50 KTS. UNLESS THERE IS A MAJOR DEVIATION FROM THE CURRENT SUITE OF MODELS, WE WILL LIKELY HAVE MANY HYDRO ISSUES. IN FACT, "IF THE FORECAST ABOVE IS REALIZED, THE HYDROLOGIC IMPACTS OF SUCH A WEATHER PATTERN ARE EXPECTED TO BE NUMEROUS AND WIDESPREAD THROUGH MANY SECTORS OF THE SERVICE AREA." PLEASE SEE THE DETAILED HYDROLOGIC OUTLOOK (SFOESFMTR) FOR MORE INFORMATION. FINALLY, AFTER THE WEEKEND STORM, THERE ARE SEVERAL MORE SYSTEMS LINED UP GOING THROUGH THE END OF NEXT WEEK AND POTENTIALLY BEYOND. NEEDLESS TO SAY, RAINFALL TOTALS BY THE MIDDLE OF JANUARY ARE GOING TO BE QUITE IMPRESSIVE. Link to comment Share on other sites More sharing options...
Chinook Posted January 4, 2017 Share Posted January 4, 2017 The model web sites don't have a color for 35.99" of rain or liquid equivalent of snow. This is the 12z GFS, 240hr (Pivotalweather.com) Link to comment Share on other sites More sharing options...
Buffalo Bumble Posted January 4, 2017 Share Posted January 4, 2017 I find these "atmospheric river" events quite fascinating. A bit surprised/disappointed there's not more discussion/obs on this. Are there any reliable snowfall observations in the higher elevations near those crazy precip totals? Link to comment Share on other sites More sharing options...
janetjanet998 Posted January 4, 2017 Author Share Posted January 4, 2017 one more wave for the "moderate primer" then a break before the monster this weekend, it was a wet december and reservoirs are rather full just for fun.... 9 day precip totals in the 1997 flood SAC 3.71 Redding 5.29 Blue Canyon 36.34 (22 inches in 72 hours) info on 1997 flood http://www.cnrfc.noaa.gov/storm_summaries/jan1997storms.php Link to comment Share on other sites More sharing options...
janetjanet998 Posted January 4, 2017 Author Share Posted January 4, 2017 1 minute ago, janetjanet998 said: just for fun.... 9 day precip totals in the 1997 flood SAC 3.71 Redding 5.29 Blue Canyon 36.34 (22 inches in 72 hours) 2 day totals ending at noon for this event SAC .26 + .87 = 1.13 Redding .16 + 1.89 = 2.05 Blue Canyon 1.27 + 3.02 = 4.29 Link to comment Share on other sites More sharing options...
janetjanet998 Posted January 4, 2017 Author Share Posted January 4, 2017 237 PM PST WED JAN 4 2017 ...FLOOD WATCH IN EFFECT FROM SATURDAY AFTERNOON THROUGH MONDAY AFTERNOON... THE NATIONAL WEATHER SERVICE IN SACRAMENTO HAS ISSUED A * FLOOD WATCH FOR A PORTION OF NORTHERN CALIFORNIA...INCLUDING THE FOLLOWING BURNEY BASIN .../ EASTERN SHASTA COUNTY... CARQUINEZ STRAIT AND DELTA...CENTRAL SACRAMENTO VALLEY...CLEAR LAKE/SOUTHERN LAKE COUNTY...MOTHERLODE...MOUNTAINS SOUTHWESTERN SHASTA COUNTY TO NORTHERN LAKE COUNTY...NORTHEAST FOOTHILLS/SACRAMENTO VALLEY...NORTHERN SACRAMENTO VALLEY... NORTHERN SAN JOAQUIN VALLEY...SHASTA LAKE AREA / NORTHERN SHASTA COUNTY...SOUTHERN SACRAMENTO VALLEY...WEST SLOPE NORTHERN SIERRA NEVADA AND WESTERN PLUMAS COUNTY/LASSEN PARK. * AN ATMOSPHERIC RIVER WILL LIKELY PRODUCE A PROLONGED PERIOD OF OCCASIONALLY INTENSE RAINFALL WITH SNOW LEVELS ABOVE 7000 TO 8000 FEET LATE SATURDAY THROUGH MONDAY. AMOUNTS NOT SEEN SINCE DECEMBER 2005. * COASTAL RANGE, SHASTA COUNTY MOUNTAINS, AND CENTRAL VALLEY: A TOTAL OF 5 TO 8 INCHES OF ADDITIONAL RAINFALL WILL BE POSSIBLE OVER HIGHER TERRAIN WHILE THE VALLEY IS EXPECTED TO RECEIVE 2 TO 5 INCHES. THE GREATEST VALLEY AMOUNTS MAY BE ACROSS THE SOUTHERN SACRAMENTO AND NORTHERN SAN JOAQUIN VALLEYS. * WEST SLOPE SIERRA NEVADA: A TOTAL OF 8 TO 15 INCHES OF ADDITIONAL RAINFALL WILL BE POSSIBLE. Link to comment Share on other sites More sharing options...
janetjanet998 Posted January 4, 2017 Author Share Posted January 4, 2017 SAC DISCUSSION (TONIGHT THROUGH MONDAY) A PACIFIC FRONTAL SYSTEM CONTINUES OVER NORTHWEST CALIFORNIA THIS AFTERNOON AND EVENING WITH PRECIPITATION GENERALLY SOUTHWARD OF THE SUTTER BUTTES. THE FRONT HAS STAGNATED TODAY WITH MUCH OF OUR FORECAST AREA WITHIN THE WARM SECTOR AHEAD OF THE FRONT WITH SNOW LEVELS ABOVE 5000 TO 6000 FEET OVER THE SIERRA. SHOWERS SHOULD BE DIMINISHING OVER THE VALLEY TONIGHT AND LINGER OVER THE SIERRA INTO THURSDAY. UPPER LEVEL RIDGING AND NORTHERLY FLOW SHOULD BRING AN END OF PRECIPITATION OVER NORCAL ON THURSDAY NIGHT AND FRIDAY. A COOL AIRMASS OVER THE REGION WILL KEEP DAYTIME HIGHS FROM WARMING MUCH FRIDAY. THE NEXT WAVE WITH ATMOSPHERIC RIVER MOISTURE BREAKS DOWN THE TRANSITORY RIDGE QUICKLY LATE FRIDAY EVENING. AN UPPER LOW SITS OUT OVER THE EASTERN PACIFIC WITH WEST-SOUTHWEST FLOW OVER REGION THAT IS FORECAST TO BRING VERY SIGNIFICANT RAINFALL TO THE AREA SATURDAY THROUGH MONDAY. MODELS HAVE THE INTEGRATED WATER TRANSPORT CENTERED OVER THE NORTHERN AND CENTRAL SIERRA, SO A PLETHORA OF RAINFALL COULD FALL OVER THE SIERRA, POSSIBLY 10 TO 15 INCHES OVER THE SIERRA AND 3 TO 5 INCHES IN THE VALLEY. WITH THESE NUMBERS IN THE SIERRA/FOOTHILLS, MODELS SHOW RETURN RAINFALL INTERVALS OF EVERY 5 TO 10 YEARS NORTHWARD OF I-80 AND 10 TO 25 YEAR RETURNS SOUTHWARD. THIS ADDITIONAL RAIN ON TOP OF ALREADY SATURATED SOIL WILL LIKELY CAUSE SOME RIVER, STREAM, CREEK AND STREET FLOODING. NON-REGULATED RIVERS (NON-DAMMED) LIKE THE COSUMNES RIVER, THE AMERICAN RIVER ABOVE FOLSOM DAM,AND OTHER SIERRA RIVERS SOUTH OF I-80 HAVE NOT SEEN POTENTIAL FLOODING OF THIS NATURE SINCE DECEMBER 2005. THIS THREE DAY EXPECTED SIERRA RAINFALL AMOUNTS ARE APPROXIMATELY TWICE THE JANUARY MONTHLY AVERAGE. JCLAPP .EXTENDED DISCUSSION (MONDAY NIGHT THROUGH WEDNESDAY) A BRIEF BREAK IN THE RAIN MON NITE INTO TUE MORNING AS THE WET WEEKEND STORM AND ITS ASSOCIATED TPW PLUME MOVE THROUGH NORCAL. BY TUE AFTERNOON AND EVENING, ANOTHER LAND-FALLING TPW PLUME HITS NORCAL AS ANOTHER SURGE OF ENERGY AND AN UPPER TROF ROTATE EWD AROUND THE UPPER LOW OVER THE NERN PAC. THE GEFS ENSEMBLE MEAN FROM 1/4/17 00Z SUGGESTS THIS PLUME WON'T BE QUITE AS MOIST AS THE WEEKEND PLUME, ALTHOUGH THE DAY OPERATIONAL RUN IS RELATIVELY SIMILAR TO ITS PREDECESSOR. Link to comment Share on other sites More sharing options...
janetjanet998 Posted January 5, 2017 Author Share Posted January 5, 2017 .CA AND PACIFIC NORTHWEST THE NEXT SURGE OF MOISTURE AND INCREASED SYNOPTIC SUPPORT WILL MOVE INTO THE WEST COAST SATURDAY INTO SATURDAY NIGHT. THIS IS SETTING UP TO BE AN IMPRESSIVE EVENT...WITH BOTH INTEGRATED MOISTURE TRANSPORT AND PRECIPITABLE WATER VALUES APPROACHING CLIMATOLOGICAL RECORD VALUES ACROSS CALIFORNIA BY LATER SATURDAY. LOW LEVEL WIND FIELDS ALSO WILL APPROACH AND/OR EXCEED THE 99TH PERCENTILE WITH THIS SYSTEM HELPING ENHANCE UPSLOPE PRECIPITATION EFFICIENCY. THUS EXPECT TO SEE IMPRESSIVE QPF AMOUNTS WITH THIS SYSTEM...WHICH WILL EXTEND BEYOND THE DAY 3 PERIOD AS WELL. THIS RAINFALL COMBINED WITH THE HEAVY ANTECEDENT RAINFALL WILL LIKELY RESULT IN INCREASED HYDROLOGICAL CONCERNS...ESPECIALLY AS SNOW LEVELS RISE. HAVE THUS INTRODUCED A BROAD MARGINAL RISK ACROSS CA ON DAY 3...WITH ONE SLIGHT RISK ALONG THE COASTAL RANGES...AND ANOTHER ALONG THE WEST FACING SLOPES OF THE SIERRAS. WPC QPF WAS GENERALLY DERIVED FROM A BLEND OF THE GFS/NAM/ECMWF/UKMET FOR THIS SYSTEM. GOOD AGREEMENT FOR 1-3" ALONG THE COASTAL AREAS OF CENTRAL/NORTHERN CA...AND 3-5" (LOCALLY HIGHER) ACROSS THE SIERRAS THROUGH 12Z SUNDAY. AS MENTIONED ABOVE ADDITIONAL PRECIPITATION IS LIKELY AFTER 12Z. Link to comment Share on other sites More sharing options...
janetjanet998 Posted January 5, 2017 Author Share Posted January 5, 2017 3 day totals ending for this event..it will likely be dry the next 36 hours SAC .26 + .87 + .25 = 1.38 Redding .16 + 1.89 +0 = 2.05 Blue Canyon 1.27 + 3.02 + 1.47 = 5.76 Link to comment Share on other sites More sharing options...
janetjanet998 Posted January 7, 2017 Author Share Posted January 7, 2017 All systems still go vanguard rain starting tonight..main wave saturday night into Sunday then a couple of slightly weaker but decent systems next week Link to comment Share on other sites More sharing options...
snownut Posted January 7, 2017 Share Posted January 7, 2017 15 hours ago, janetjanet998 said: All systems still go vanguard rain starting tonight..main wave saturday night into Sunday then a couple of slightly weaker but decent systems next week janetjanet998.... do you live in the west ? can't tell from your signature. Thanks for posting this week. Pretty amazing event for sure! I live in Central Oregon so colder here and most of the storms since early December have been frozen. I have had 15 snows of 1/2" or more in the past 31 days and 51-1/2" of snow total .. snowing today and next Tuesday could be another decent snow?? Happy Winter and Cheers to a reduced west coast fire season this summer !! Link to comment Share on other sites More sharing options...
janetjanet998 Posted January 7, 2017 Author Share Posted January 7, 2017 57 minutes ago, snownut said: janetjanet998.... do you live in the west ? can't tell from your signature. Thanks for posting this week. Pretty amazing event for sure! I live in Central Oregon so colder here and most of the storms since early December have been frozen. I have had 15 snows of 1/2" or more in the past 31 days and 51-1/2" of snow total .. snowing today and next Tuesday could be another decent snow?? Happy Winter and Cheers to a reduced west coast fire season this summer !! No, I'm in dry and cold IL 12z NAM has 850MB winds of 80 kts at 18z sunday, GFS 70 kts Link to comment Share on other sites More sharing options...
janetjanet998 Posted January 7, 2017 Author Share Posted January 7, 2017 On January 5, 2017 at 1:05 PM, janetjanet998 said: 3 day totals ending for this event..it will likely be dry the next 36 hours SAC .26 + .87 + .25 = 1.38 Redding .16 + 1.89 +0 = 2.05 Blue Canyon 1.27 + 3.02 + 1.47 = 5.76 part 1 of round 2 as of noon saturday(last 24 hours of precip)...a brief break in the valley before the huge event tonight..still getting rates up to .25/in per hour in the hills even after this lull SAC .91 Redding .79 Blue Canyon .50 Link to comment Share on other sites More sharing options...
Chinook Posted January 7, 2017 Share Posted January 7, 2017 Just saw this: populated areas of Oregon expecting 0.25" to 0.75" of ice. That could do real damage to Portland's trees and get a lot of people in traffic accidents. Link to comment Share on other sites More sharing options...
Sophisticated Skeptic Posted January 8, 2017 Share Posted January 8, 2017 wow...people in Cali don't even post here? this storm is historic. Major flooding in spots already. Link to comment Share on other sites More sharing options...
snownut Posted January 8, 2017 Share Posted January 8, 2017 Historic winter continues here in Central OR.. I have had 59" of snow at my house in the past 34 days. Today was to be in the 30's with rain and freezing rain. So far inversion is holding and mix of sleet and snow with temperature of 12 degrees at 12 noon.. after another night in the single digits last night. Potential for a big snowstorm again on Tuesday and Wednesday. Doubt I will see the ground again for a long time and snow pile long into the spring months. Some photos. Parking lot at my office this morning ... sea of snow piles ... picture of my back yard yesterday ... we had 6 more inches after I took that photo ! Link to comment Share on other sites More sharing options...
Sophisticated Skeptic Posted January 8, 2017 Share Posted January 8, 2017 1 gauge has already hit a record high , with 3 more days of heavy rain expected. Willow Brook at PennGrove http://water.weather.gov/ahps2/hydrograph.php?gage=pfsc1&wfo=mtr Link to comment Share on other sites More sharing options...
Sophisticated Skeptic Posted January 8, 2017 Share Posted January 8, 2017 I guess Area 51 is lucky their further south. Quote Nevada : At least five roads in Washoe County are in an evacuation zone as officials fear a retention pond could soon spill over. geez...and I thought we could finally get the truth. Link to comment Share on other sites More sharing options...
janetjanet998 Posted January 8, 2017 Author Share Posted January 8, 2017 8 station rainfall index, which is an average of 8 gauges in northern Ca starting OCT 1ST is 184% of Normal for the date, it's even ahead of the record 1982-83 El-Nino pace(but its going to be hard to get that insane pace in Feb and March in that year) http://cdec.water.ca.gov/cgi-progs/products/PLOT_ESI.pdf Link to comment Share on other sites More sharing options...
Sophisticated Skeptic Posted January 8, 2017 Share Posted January 8, 2017 Nevada's got issues.. Looks like their about to close Route 80 in spots as well.....ohh boy. Link to comment Share on other sites More sharing options...
Sophisticated Skeptic Posted January 10, 2017 Share Posted January 10, 2017 impressive Link to comment Share on other sites More sharing options...
Chinook Posted January 10, 2017 Share Posted January 10, 2017 20 inches of precipitation in the last 7 days - that section of the northern Sierra might expect another 7-8" in the next week! Just think, that could be 200" of snow. Link to comment Share on other sites More sharing options...
janetjanet998 Posted January 10, 2017 Author Share Posted January 10, 2017 8 station index now at 41.9 inches over 200% of normal and a record for this time of year(average is 50 inches oct-oct and record is 88.5 in 1982-3) in 1982-83 on Feb 1st the index was about 41 good news is that look like a 5-6 day break or so after this system http://cdec.water.ca.gov/cgi-progs/products/PLOT_ESI.pdf Link to comment Share on other sites More sharing options...
janetjanet998 Posted January 14, 2017 Author Share Posted January 14, 2017 next waves start tuesday 46.2 inches on the 8 station index now up around 15 inches since Jan 1st https://cdec.water.ca.gov/cgi-progs/products/PLOT_ESI.pdf Link to comment Share on other sites More sharing options...
OUGrad05 Posted January 14, 2017 Share Posted January 14, 2017 29 minutes ago, janetjanet998 said: next waves start tuesday 46.2 inches on the 8 station index now up around 15 inches since Jan 1st https://cdec.water.ca.gov/cgi-progs/products/PLOT_ESI.pdf California desperately needs the moisture, hopefully this helps replenish some of their water supplies via rain and eventually snow melt. Link to comment Share on other sites More sharing options...
yoda Posted January 17, 2017 Share Posted January 17, 2017 Talk about ice URGENT - WINTER WEATHER MESSAGE NATIONAL WEATHER SERVICE PORTLAND OR 453 AM PST TUE JAN 17 2017 ...MAJOR ICE STORM LIKELY TODAY THROUGH WEDNESDAY FOR THE HOOD RIVER AND WIND RIVER VALLEYS...THE COLUMBIA RIVER GORGE...AS WELL AS MANY VALLEYS WITHIN THE GIFFORD PINCHOT NATIONAL FOREST... ...FREEZING RAIN EXPECTED TUESDAY FOR THE GREATER PORTLAND AND VANCOUVER METRO AREA...NEARBY VALLEYS IN THE COAST RANGE AND CASCADES...AND THE CENTRAL AND SOUTH WILLAMETTE VALLEY... .TEMPERATURES ARE EXPECTED TO REMAIN AT OR BELOW FREEZING UNDER VALLEY INVERSIONS TONIGHT AND TUESDAY MORNING. MEANWHILE...A VERY MOIST PACIFIC FRONTAL SYSTEM WILL SPREAD RAIN ACROSS THE REGION THIS MORNING...INCREASING THIS AFTERNOON AND EVENING. THERE WILL LIKELY BE SEVERAL HOURS OF RAIN BEFORE WARM AIR ALOFT CAN WORK ITS WAY DOWN TO THE VALLEY FLOORS...LEADING TO THE POTENTIAL OF SEVERAL HOURS OF FREEZING RAIN. AREAS IN AND NEAR THE COLUMBIA GORGE WILL BE HARDEST HIT...AS THEY WILL BE THE LAST TO CLIMB ABOVE FREEZING. ORZ014>016-WAZ045-046-180100- /O.CON.KPQR.IS.W.0002.170117T1400Z-170119T0200Z/ UPPER HOOD RIVER VALLEY-WESTERN COLUMBIA RIVER GORGE- CENTRAL COLUMBIA RIVER GORGE- INCLUDING THE CITIES OF...ODELL...CORBETT...HOOD RIVER...CARSON... UNDERWOOD 453 AM PST TUE JAN 17 2017 ...ICE STORM WARNING REMAINS IN EFFECT UNTIL 6 PM WEDNESDAY BELOW 2500 FEET FOR UPPER HOOD RIVER VALLEY AND THE COLUMBIA GORGE... AN ICE STORM WARNING BELOW 2500 FEET FOR FREEZING RAIN AND SLEET REMAINS IN EFFECT UNTIL 6 PM PST WEDNESDAY. * TIMING...OCCASIONAL LIGHT PRECIPITATION TODAY. LATER TODAY AND TONIGHT...PRECIPITATION WILL INCREASE AND BECOME HEAVY AT TIMES. * ICE ACCUMULATION...GENERALLY LESS THAN A TENTH OF AN INCH OF ACCUMULATION THROUGH EARLY THIS AFTERNOON. BUT AS PRECIPITATION INCREASES LATER TODAY AND TONIGHT...EXPECT MAJOR ICE ACCUMULATIONS. GENERALLY...ICE ACCUMULATIONS OF A HALF INCH TO ONE INCH WILL BE FAIRLY WIDESPREAD. SOME LOCATIONS MAY EXCEED ONE AND A HALF OF INCHES OF ICE FROM THIS STORM. * IMPACTS...THIS IS EXPECTED TO BE YET ANOTHER MAJOR ICE STORM FOR THE WESTERN AND CENTRAL COLUMBIA GORGE AND SURROUNDING VALLEYS. HEAVY ICE ACCUMULATION WILL LIKELY BRING DOWN SOME LARGE BRANCHES AND POWER LINES. POWER OUTAGES MAY LAST MULTIPLE DAYS DEPENDING ON HOW WIDESPREAD THESE IMPACTS ARE. THIS EVENT WILL ONLY ADD TO THE EXISTING HEAVY SNOW AND ICE LOADING ON ROOFTOPS...WHICH MAY CAUSE SOME ROOFTOPS TO FAIL. Link to comment Share on other sites More sharing options...
yoda Posted January 17, 2017 Share Posted January 17, 2017 URGENT - WINTER WEATHER MESSAGE NATIONAL WEATHER SERVICE PORTLAND OR 453 AM PST TUE JAN 17 2017 ...MAJOR ICE STORM LIKELY TODAY THROUGH WEDNESDAY FOR THE HOOD RIVER AND WIND RIVER VALLEYS...THE COLUMBIA RIVER GORGE...AS WELL AS MANY VALLEYS WITHIN THE GIFFORD PINCHOT NATIONAL FOREST... ...FREEZING RAIN EXPECTED TUESDAY FOR THE GREATER PORTLAND AND VANCOUVER METRO AREA...NEARBY VALLEYS IN THE COAST RANGE AND CASCADES...AND THE CENTRAL AND SOUTH WILLAMETTE VALLEY... .TEMPERATURES ARE EXPECTED TO REMAIN AT OR BELOW FREEZING UNDER VALLEY INVERSIONS TONIGHT AND TUESDAY MORNING. MEANWHILE...A VERY MOIST PACIFIC FRONTAL SYSTEM WILL SPREAD RAIN ACROSS THE REGION THIS MORNING...INCREASING THIS AFTERNOON AND EVENING. THERE WILL LIKELY BE SEVERAL HOURS OF RAIN BEFORE WARM AIR ALOFT CAN WORK ITS WAY DOWN TO THE VALLEY FLOORS...LEADING TO THE POTENTIAL OF SEVERAL HOURS OF FREEZING RAIN. AREAS IN AND NEAR THE COLUMBIA GORGE WILL BE HARDEST HIT...AS THEY WILL BE THE LAST TO CLIMB ABOVE FREEZING. WAZ019-180100- /O.CON.KPQR.IS.W.0002.170117T1400Z-170119T0200Z/ SOUTH WASHINGTON CASCADES- 453 AM PST TUE JAN 17 2017 ...ICE STORM WARNING REMAINS IN EFFECT UNTIL 6 PM WEDNESDAY BELOW 3000 FEET IN THE SOUTH WASHINGTON CASCADES... AN ICE STORM WARNING BELOW 3000 FEET FOR FREEZING RAIN AND SLEET REMAINS IN EFFECT UNTIL 6 PM PST WEDNESDAY. * TIMING...OCCASIONAL LIGHT PRECIPITATION TODAY. BUT LATER TODAY AND TONIGHT...PRECIPITATION WILL INCREASE AND BECOME HEAVY AT TIMES. * ICE ACCUMULATION...GENERALLY LESS THAN A TENTH OF AN INCH OF ACCUMULATION THROUGH EARLY THIS AFTERNOON. BUT AS PRECIPITATION INCREASES LATER TODAY AND TONIGHT...EXPECT MAJOR ICE ACCUMULATIONS. GENERALLY...ICE ACCUMULATIONS OF A HALF INCH TO ONE INCH WILL BE FAIRLY WIDESPREAD. SOME LOCATIONS COULD GET AS MUCH AS 2 INCHES OF ICE FROM THIS STORM. * IMPACTS...HEAVY ICE ACCUMULATION WILL LIKELY BRING DOWN SOME LARGE BRANCHES AND POWER LINES. POWER OUTAGES MAY LAST MULTIPLE DAYS DEPENDING ON HOW WIDESPREAD THESE IMPACTS ARE. THIS EVENT WILL ONLY ADD TO THE EXISTING HEAVY SNOW AND ICE LOADING ON ROOFTOPS...WHICH MAY CAUSE SOME ROOFTOPS TO FAIL. Link to comment Share on other sites More sharing options...
janetjanet998 Posted February 4, 2017 Author Share Posted February 4, 2017 I edited the title to take out January as it continues to be wet snowpack very deep after a week lull very wet pattern again the 8 station Northern CA rainfall is double normal for this time of year and still running well ahead of the record year 1982-83 http://cdec.water.ca.gov/cgi-progs/products/PLOT_ESI.pdf Link to comment Share on other sites More sharing options...
andyhb Posted February 4, 2017 Share Posted February 4, 2017 Up to ~8" depth here from this latest storm. Link to comment Share on other sites More sharing options...
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