tag:blogger.com,1999:blog-7478606652950905956.post624540908053061663..comments2024-03-28T10:16:44.231-07:00Comments on Cliff Mass Weather Blog: Amazing Murk, Very Wet on the Cascade Slopes, and an Unusual Atmospheric RiverCliff Mass Weather Bloghttp://www.blogger.com/profile/13948649423540350788noreply@blogger.comBlogger8125tag:blogger.com,1999:blog-7478606652950905956.post-72603039005911626022020-02-08T08:35:19.229-08:002020-02-08T08:35:19.229-08:00I would like to read your analysis on the low leve...I would like to read your analysis on the low level wind shear we had last night. Flights landing in Seattle experienced the feeling of riding on ocean waves except in the air.Kristenhttps://www.blogger.com/profile/08668290040974361555noreply@blogger.comtag:blogger.com,1999:blog-7478606652950905956.post-53924923385518541702020-02-08T08:17:30.732-08:002020-02-08T08:17:30.732-08:00I remember the sandbags well as my wife and I freq...I remember the sandbags well as my wife and I frequently cycled the Green River trail. I think you are correct that the dam did not come close to failing, so that was a major overstatement. There was considerable concern that leakage from the dam and the need to reduce dam levels could cause flooding.<br /><br />https://www.yumpu.com/en/document/read/38434307/howard-hanson-dam-interim-risk-reduction-final-seattle-districtMAC in Bellinghamhttps://www.blogger.com/profile/00951163853106956325noreply@blogger.comtag:blogger.com,1999:blog-7478606652950905956.post-64851888166470919762020-02-07T23:28:17.327-08:002020-02-07T23:28:17.327-08:00On 2/5, I measured 0.00" of evapotranspiratio...On 2/5, I measured 0.00" of evapotranspiration at my location in NW Bellingham. Daily evapotranspiration (measured in inches and most easily understood as negative rainfall) is equal to the sum of the amount of water vapor released to the atmosphere by a particular type of vegetation during the metabolic process of transpiration and the amount of liquid water (dew) evaporated into the atmosphere from the surface of that particular type of vegetation over the course of of a 24-hour period. Evapotranspiration is a parameter which is calculated/estimated rather than measured, the equation for which includes variables for temperature, humidity, solar irradiance and wind speed in addition to a constant which is determined experimentally and corresponds to a particular type of vegetation cover. All of the terms of the equation are directly related to evapotranspiration except humidity in that lower temperature, irradiance and wind speeds tend to inhibit evapotranspiration while lower humidity tends to promote evapotranspiration. Thus, a cool/cold, rainy/humid, cloudy/overcast day with calm winds is the prime candidate for especially low evapotranspiration values and 2/5 was just such a day. The temperature range that day was 34F-39F, the relative humidity ranged from 96%-97% (the dew point ranged from 33F-39F), the maximum solar irradiance value was 62 W/m^2 (for reference, 62 W/m^2 was the lowest irradiance value I had measured in at least 25 days and on 2/3, I measured a maximum irradiance value of 566 W/m^2 - nearly an order of magnitude greater then the 2/5 max value). Finally, the maximum wind speed on 2/5 was just 5MPH from the NW and I measured 0.68" of precipitation to boot. This was truly a cold, nasty day and a textbook example of a day during which the weather conditions were ideally suited to minimize evapotranspiration.Friendhttps://www.blogger.com/profile/16113544345441368032noreply@blogger.comtag:blogger.com,1999:blog-7478606652950905956.post-25088762957733727382020-02-07T17:40:25.262-08:002020-02-07T17:40:25.262-08:00Cliff,
I am ready for a dry Sunday! Especially ...Cliff, <br /><br />I am ready for a dry Sunday! Especially so after all the rainy, colder conditions. No raincoats, wind in our hair and smiles on our faces. Let's do it!<br /> Sharonhttps://www.blogger.com/profile/01122154083786146743noreply@blogger.comtag:blogger.com,1999:blog-7478606652950905956.post-2669286816611455012020-02-07T12:47:37.095-08:002020-02-07T12:47:37.095-08:00Cliff, are we seeing a higher incidence of mudslid...Cliff, are we seeing a higher incidence of mudslides due to the wet weather in WA. I dont remember seeing so many in such a short amount of time but im interested to know whether there is mudlside occurence data over time anywhere? This article peaked the thought: https://www.nrk.no/chasing-climate-change-1.14859595GGhttps://www.blogger.com/profile/02678283756644303957noreply@blogger.comtag:blogger.com,1999:blog-7478606652950905956.post-84749000393158971002020-02-07T10:56:00.208-08:002020-02-07T10:56:00.208-08:00"almost took out the Howard Hanson Dam."..."almost took out the Howard Hanson Dam." A bit of hyperbole for effect I hope. <br /><br />I moved many tons of sand bags that year to protect my work site in the Kent valley for the event that never occurred. High flow rates on the Green River for many months, yes. Levies temporarily raised as a precautionary measure, yes. The reservoir drawn down to allow repairs to be effected safely, yes. The dam almost being "taken out", no. Anything approaching the Oroville Dam event, no.<br /><br />Please leave the hyperbole for other, less reputable news sources.Dion Ghttps://www.blogger.com/profile/05413543353353174264noreply@blogger.comtag:blogger.com,1999:blog-7478606652950905956.post-28481002883577664722020-02-07T10:17:56.071-08:002020-02-07T10:17:56.071-08:0010 day RFC verification also shows it well - inclu...10 day RFC verification also shows it well - including Wallowas/Clearwater region:<br /><br />https://www.nwrfc.noaa.gov/weather/verif_fcst.cgi?date=20200207<br /><br />Verification shows more fell than forecast. <br /><br />Also check out the Grande Ronde response:<br />https://www.nwrfc.noaa.gov/river/station/flowplot/flowplot.cgi?tryo3<br />https://www.nwrfc.noaa.gov/river/station/flowplot/flowplot.cgi?lgno3<br /><br />2 days ago, the Grande Ronde at Troy was 2.5 kcfs - now just passing 30 kcfs. Robhttps://www.blogger.com/profile/16102125894383180278noreply@blogger.comtag:blogger.com,1999:blog-7478606652950905956.post-52550249144212325702020-02-06T22:45:24.552-08:002020-02-06T22:45:24.552-08:00This atmospheric river is also evident in SE Washi...This atmospheric river is also evident in SE Washington as a NW flow moving upslope in the Palouse and Blue Mountains.Unusually heavy precip in those areas with many local rivers at or near flood stage.Johnhttps://www.blogger.com/profile/03855312259314603071noreply@blogger.com