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Downburst
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=== Wet microbursts === [[File:Downburst 1.jpg|thumb|A wet microburst]] Wet microbursts are downbursts accompanied by significant precipitation at the surface.<ref name="fuj85">* [[Ted Fujita|Fujita, T.T.]] (1985). "The Downburst, microburst and macroburst". SMRP Research Paper 210, 122 pp.</ref> These downbursts rely more on the drag of precipitation for downward acceleration of [[Air parcel|parcels]] as well as the negative [[buoyancy]] which tend to drive "dry" microbursts. As a result, higher [[mixing ratio]]s are necessary for these downbursts to form (hence the name "wet" microbursts). Melting of ice, particularly [[hail]], appears to play an important role in downburst formation (Wakimoto and Bringi, 1988),{{Full citation needed|date=April 2025}} especially in the lowest {{convert|1|km|abbr=on|sigfig=1}} above surface level.<ref>Proctor, 1989</ref>{{Full citation needed|date=April 2025}} These factors, among others, make [[Weather forecasting|forecasting]] wet microbursts difficult. {| class="wikitable" |- ! '''Characteristic''' ! '''Dry Microburst''' ! '''Wet Microburst''' |- | '''Location of highest probability within the United States''' | [[Midwestern United States|Midwest]] / [[Western United States|West]] | [[Southeastern United States|Southeast]] |- | '''Precipitation''' | Little or none | Moderate or heavy |- | '''Cloud bases''' | As high as 500 hPa (mb) | As high as 850 hPa (mb) |- | '''Features below cloud base''' | [[Virga]] | [[Precipitation shaft]] |- | '''Primary catalyst''' | Evaporative cooling | Precipitation loading and evaporative cooling |- | '''Environment below cloud base''' | Deep dry layer/low relative humidity/dry adiabatic lapse rate | Shallow dry layer/high relative humidity/moist adiabatic lapse rate |- |}
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