on September 27, 2022
Do ice crystals form in running super-cold water?
Earth scienceAsked by: Ellen Belanger At what temperature do ice crystals form? Fig. 1. At temperatures above 0°C, water remains a liquid. Between 0 and about -36°C, water only crystallises into ice if coerced e.g. by making freezing more likely by there being an ice nucleus, such as a dust particle, present in the water. How
on September 27, 2022
Weather station data
Earth scienceAsked by: Ellen Belanger Where can I download weather station data? Where can I find this information? Check out NCEI’s station locator at: https://www.ncdc.noaa.gov/cdo-web/datatools/findstation or the Historical Observing Metadata Repository (HOMR) at NCEI at: https://www.ncdc.noaa.gov/homr/. What data do weather stations collect? weather stations in the United States measure weather conditions many times every day. Each
on September 27, 2022
What factors determine the number of Hadley cells for a planet?
Earth scienceAsked by: Philip Page So the number of cells will be determined by the winds that start either at the equator or the pole and the distance that they can cover before being deflected into completely zonal direction. What are global atmospheric circulation cells made of? The global circulation can be described as the world-wide
on September 27, 2022
Does the snow come from local moisture or transported moisture?
Earth scienceAsked by: Philip Page The moisture comes from nearby water bodies, and then it’s transported to where it’s going to precipitate. It is local and transported moisture. Is there moisture in snow? Liquid equivalent is the amount of measurable moisture if the snow were to have fallen as rain. This is where the infamous “10-to-1”
on September 27, 2022
Why does the earliest sunset time not coincide with the shortest day of the year?
Earth scienceAsked by: Quintin Prestige It changes throughout the year because the earth’s axis is tilted with respect to its orbit around the sun, and the earth’s orbit is an ellipse. The longer-than-average solar day around the solstices causes both earliest sunset and latest sunrise to not fall on the solstice. What is the earliest sunset
on September 27, 2022
What is the difference between w-wind, vertical p-velocity and Omega?
Earth scienceAsked by: Tracey White What is omega vertical velocity? Omega is the vertical velocity in pressure coordinates (so positive omega is negative w). Omega has units of pressure per time. Because much of the operational meteorology uses pressure surfaces, omega is a more common quantity to see. What is omega in wind? Contact Us. T-Omega
on September 27, 2022
Rainfall units conversion from depth to rate/intensity
Earth scienceAsked by: Tracey White In order to have the average rainfall intensity in m/s corresponding to that interval of time, you have to divide the rainfall depth for the number of seconds in the time interval or for mm/s you multiply for 1000/21600. If you want the intensity in m/h you divide for 6 hours.
on September 27, 2022
Why does the moon orbit the earth and not the sun instead?
Earth scienceAsked by: Lynn Logan The force of the gravitational force of earth is more than the sun on moon.So the moon revolves around the earth not the sun. Why does the moon orbit the earth instead of the earth orbiting the moon? Earth is larger than the moon, so Earth pulls on the moon. At
on September 27, 2022
How does the lack of data about the Mesosphere affect our predictive knowledge of the atmosphere?
Earth scienceAsked by: Lynn Logan Why do we know so little about the mesosphere? The mesosphere is difficult to study, so less is known about this layer of the atmosphere than other layers. Weather balloons and other aircraft cannot fly high enough to reach the mesosphere. Satellites orbit above the mesosphere and cannot directly measure the
on September 27, 2022
Publicly available data set with ensemble forecasts and observations?
Earth scienceAsked by: Robby Filippi Why do we use ensemble forecasts? Ensemble forecasting is a method used in or within numerical weather prediction. Instead of making a single forecast of the most likely weather, a set (or ensemble) of forecasts is produced. This set of forecasts aims to give an indication of the range of possible