Nonetheless, dew formed on some surfaces of my car and frozen dew formed on other surfaces. Further, the temperature never was below the freezing point temperature. Notice that the temperature never was equal to or lower than the dew point temperature at any time overnight. Weather data provided courtesy Brandon Peloquin, Senior Forecaster, National Weather Service Baltimore/Washington Forecast Office, Sterling, Virginia.) Time (UTC) Dew Point Depression = Temperature – Dew Point Temperature. (Note: All temperatures expressed in Fahrenheit degrees. The following data table shows select weather observations at Ronald Reagan Washington National Airport (DCA) on Wednesday, 02 November 2011. Is frost the same as frozen dew? In a word, no! Remember, frost NEVER exists in the liquid phase - frost forms when water vapor (gas) changes phase to ice (solid) in a process called deposition. Voila, frozen dew! Frozen dew occurs only a few times a year, usually during spring and fall. Next, some surfaces (e.g., my automobile windshield) reached a temperature below the freezing point temperature of water substance (0☌, 32☏). This occurs when dew forms and temperatures later drop below freezing.įirst, dew formed when the air temperature reached the dew point temperature and water vapor (gas) in the atmosphere condensed to become dew (liquid). When liquid dew changes into tiny beads of ice. What is frozen dew? The National Weather Service Glossary defines “frozen dew” as follows: I thought the windshield had dew on it, that is, until I turned on the windshield wipers … surprise, the windshield was covered with ice (solid)! In the preceding photo gallery (shown above), you can see frozen water droplets as well as rivulets where liquid water had been flowing down the windshield before freezing solid. In fact, I remember my hand got wet when I opened the car door. There was dew (liquid) on the driver’s side door. I observed frozen dew on the outside of the windshield of my 2007 Honda Civic four-door sedan, at ~8:30 a.m. Photos 7-8 show the image direction is 218.4602 degrees, meaning the tip of the gnomon is pointing southwest rather than true geographic north (0, 360 degrees). Photos 3-4 show the gnomon is inclined at an angle of 31.86 degrees (~32 degrees) Photos 5-6 show the latitude of the sundial is 38 degrees 48 minutes 22.2 seconds. Photos 1-2 of 8 (shown below) verify that the dial plate is horizontal. More simply, the dial face should be aligned so that 12 noon points toward geographic north and the 12 noon hour line is aligned with your local meridian.
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