chapter5

chapter5 - This can happen numerous times, yielding...

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Rain- > 0.5mm in size, under that is called drizzle. Majority of rain begins as snow crystals which melt as they fall into the air above freezing Virga- Occurs when rain falls into unsaturated air and evaporates before reaching the ground Snow- Precipitation in form of snowflakes Size, shape and amount of snowflakes dependent on temperature where they form. Low temperatures means low moisture context, which leads to pwdery snowflakes At temps > -5 C, the flakes join into larger clumps, which are good for snowballs but bad for backs Sleet- occurs when snow falls into a layer of air that is above freezing, it melts, then it falls into a thick layer that's below freezing and refreezes into ice pellets. Freezing Rain- snow falls into >32F layer, melts, falls into a shallow layer of below freezing air, and it freezes upon contact with objects. -The rain has become supercooled What is Hail? Produced only in cumulonimbus clouds with strong updrafts and lots of supercooled water Occurs when ice pellets are captured in an updraft then back through supercooled water, gain in size
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Unformatted text preview: This can happen numerous times, yielding softball-sized hailstones Rime- Occurs when supercooled cloud droplets deposit on objects whose temperatures are below freezing. Precipitation Measurement- rain gauge collecting funnel brings rain into tube 1/10 th it's size-Standard, tipping bucket or weighing gauge Weather radar-Algorithms to calculate storm totals Snowfall measurement inaccurate at best-Lots of drifting and compaction Cloud Seeding encourage growth of ice crystals by dropping dry ice or silver iodide into cloud with supercooled water-Primarily for rainfall enhancement-Used in vail and Beaver Creek ski areas-Fog/Cloud dispersal seeding causes ice crystal formation, which then settle out, leaving openings-Hail suppression extensive seeding leads to millions of ice crystals which compete for the supercooled water drops Frost prevention to save crops-Water sprinklers, orchard heaters, air mixing techniques...
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chapter5 - This can happen numerous times, yielding...

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