It is somewhat independant of the cloud cover forecast in that there can be isolated clouds in a transparent air mass, and poor transparency can occurĪbove average transparency is necessary for good observation of low contrast objects like galaxies and nebulae. It's calculated from the total amount of water vapor in theĪir. The total transparency of the atmosphere from ground to space. Here 'transparency' means just what astronomers mean The line, labeled Transparency, forecasts the transparency of the air. It's always wise to click on a colored block for the hour you want to observe and see if your location is close to a cloud edge.ĬMC's text page explaining this forecast is Is 76% and the mostly-cloudy accuracy is 89%. When the forecast is predicting more than 36 hours into the future, the mostly-clear accuracy Mostly-clear forecasts (cloud75%) have been When the forecast is clear, the sky may still be hazy, if the transparency forecast is poor.Īccuracy averaged over North America for a 30 day period: when the forecast is predicting less than 12 hours into the future,
This forecast may miss low cloud and afternoon thunderstorms. Lighter shades of blue are increasing cloudiness and white is overcast. The colors are picked from what color the sky is likely to be, with
The line, labeled Cloud Cover forecasts total cloud cover. (Local time for Elk Grove is -7.0 hours from GMT.) A digit 1 on top of a 3 means 13:00 or 1pm. The two numbers at the top of a column is the time. The colors of the blocks are the colors from CMC's forecast maps for that hour. Summary: In the rows labeled "sky conditions", find a column of blue blocks. Summarizes CMC's forecast images just for Elk GroveĪnd the surroundings out to about 10 miles. So, I (Attilla Danko) wrote a script to generate the images like the one above It can be a chore to find the one map that tells you if you can observe tonight. CMC's numerical weather forecasts are unique because they are specifically designed for astronomers.īut they have 1180 forecast maps. The data comes from a forecast model developed by Allan Rahill of theĬanadian Meteorological Centre. It's a prediction of when Elk Grove, CA, will have good weather for astronomical observing. At a glance, it shows when it will be cloudy or clear for the If you see storm-related damage along the city’s creeks or public roadways that has not yet been addressed, please contact the Public Works Hotline at (916) 687-3005.Used for public star parties by the Sacramento Valley Astronomical Association (SVAS). There are currently no reports of serious injuries from traffic collisions or property damage from flooding. Sunday’s rainfall is being considered a record-breaking 250-year event. The Police Department connected with homeless individuals throughout the community and offered to assist with relocating them to a safe place.Officers closed flooded roads proactively where necessary to avoid incidents. The Police Department opened a Department Operations Center to monitor traffic cameras and report flooding on major intersections.The majority of the calls were storm-related. The 9-1-1 Communications Center answered nearly 70% more emergency and non-emergency calls than an average Sunday.All storm-related road closures have been lifted and roads have re-opened.As the system continued to work, most roadways saw the waters recede, but Elk Grove creeks and waterways continue to run high today. While most of the City’s drainage systems worked as they were designed to, the sheer amount of rainfall meant that most systems were operating at capacity. Public Works crews worked non-stop responding to calls for service, monitoring the drainage system, cleaning out clogged storm drains and relieving localized flooding.The Public Works Hotline fielded more than 550 calls for localized flooding.Many City staff have been working around the clock to care for the community during this weekend’s severe weather.
Elk Grove rain gauges recorded 5.12 inches of rainfall over a 24-hour period. It looks like the worst is over, but this weekend’s storm brought wind, lots of rain, and some localized flooding to Elk Grove and the entire Sacramento region.
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