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    Intense Convection Observed by NASA ER-2 in Hurricane Emily (2005)

    Source: Monthly Weather Review:;2009:;volume( 138 ):;issue: 003::page 765
    Author:
    Cecil, Daniel J.
    ,
    Quinlan, Kevin R.
    ,
    Mach, Douglas M.
    DOI: 10.1175/2009MWR3063.1
    Publisher: American Meteorological Society
    Abstract: On 17 July, intense convection in the eyewall of Hurricane Emily (2005) was observed by the high-altitude (?20 km) NASA ER-2 aircraft. Analysis of this convection is undertaken using downward-looking radar, passive microwave radiometer, electric field mills, and Geostationary Operational Environmental Satellite-11 (GOES-11) rapid-scan infrared imagery. Radar data show convection reaching more than 17 km, with reflectivity more than 40 dBZ and estimated updraft speeds greater than 20 m s?1 at ?14-km altitude. All of the passive microwave frequencies (10, 19, 37, and 85 GHz) experienced scattering by large ice particles. Large electric fields with dozens of lightning flashes were recorded. Because of safety concerns arising from difficulties with the first two transects, the flight plan was modified to avoid passing above the eyewall again. These observations occurred 8?10 h after Emily?s peak 929-hPa intensity, with central pressures from reconnaissance aircraft having risen to 943 hPa immediately before the flight and 946 hPa immediately afterward (no such measurements available during the flight). Rapid-scan infrared imagery reveals that a period of episodic bursts of strong, deep convection was beginning just as the ER-2 arrived. The first leg across the eye coincided with a rapidly growing new cell along the flight track in the western eyewall. This strong convection may have been characteristic of Emily for the ?24 h leading up to landfall in the Yucatan, but it does not appear to be a continuation of convective trends from the previous rapid intensification or peak intensity periods.
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      Intense Convection Observed by NASA ER-2 in Hurricane Emily (2005)

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    contributor authorCecil, Daniel J.
    contributor authorQuinlan, Kevin R.
    contributor authorMach, Douglas M.
    date accessioned2017-06-09T16:32:23Z
    date available2017-06-09T16:32:23Z
    date copyright2010/03/01
    date issued2009
    identifier issn0027-0644
    identifier otherams-69638.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4211329
    description abstractOn 17 July, intense convection in the eyewall of Hurricane Emily (2005) was observed by the high-altitude (?20 km) NASA ER-2 aircraft. Analysis of this convection is undertaken using downward-looking radar, passive microwave radiometer, electric field mills, and Geostationary Operational Environmental Satellite-11 (GOES-11) rapid-scan infrared imagery. Radar data show convection reaching more than 17 km, with reflectivity more than 40 dBZ and estimated updraft speeds greater than 20 m s?1 at ?14-km altitude. All of the passive microwave frequencies (10, 19, 37, and 85 GHz) experienced scattering by large ice particles. Large electric fields with dozens of lightning flashes were recorded. Because of safety concerns arising from difficulties with the first two transects, the flight plan was modified to avoid passing above the eyewall again. These observations occurred 8?10 h after Emily?s peak 929-hPa intensity, with central pressures from reconnaissance aircraft having risen to 943 hPa immediately before the flight and 946 hPa immediately afterward (no such measurements available during the flight). Rapid-scan infrared imagery reveals that a period of episodic bursts of strong, deep convection was beginning just as the ER-2 arrived. The first leg across the eye coincided with a rapidly growing new cell along the flight track in the western eyewall. This strong convection may have been characteristic of Emily for the ?24 h leading up to landfall in the Yucatan, but it does not appear to be a continuation of convective trends from the previous rapid intensification or peak intensity periods.
    publisherAmerican Meteorological Society
    titleIntense Convection Observed by NASA ER-2 in Hurricane Emily (2005)
    typeJournal Paper
    journal volume138
    journal issue3
    journal titleMonthly Weather Review
    identifier doi10.1175/2009MWR3063.1
    journal fristpage765
    journal lastpage780
    treeMonthly Weather Review:;2009:;volume( 138 ):;issue: 003
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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