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

Cecil, Daniel J.; Quinlan, Kevin R.; Mach, Douglas M.
March 2010
Monthly Weather Review;Mar2010, Vol. 138 Issue 3, p765
Academic Journal
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 dB Z 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.


Related Articles

  • From the Editor. Wolf, Richard I. // Air Power History;Winter2015, Vol. 62 Issue 4, p3 

    An introduction to the journal is presented in which the editor discusses topics featured in the issue including the life of Deputy Director of the National Aeronautics and Space Administrator Hugh L. Dryden, development of the ferret aircraft, and aerial reconnaissance.

  • IN ORBIT.  // Aviation Week & Space Technology;6/15/2009, Vol. 170 Issue 24, p34 

    This section offers news briefs on the aviation industry. Researchers studying the wet chemistry on Mars have discovered a link between the blobs on the legs of the Marsh Phoenix lander and images of ravines and gullies above the planet. The U.S. National Aeronautics and Space Administration is...

  • In Orbit.  // Aviation Week & Space Technology;8/13/2007, Vol. 167 Issue 7, p6 

    This section offers news briefs on aviation and space technology. NASA will fund concept studies of experiments on the Moon designed to test Einstein's General Theory of Relativity. Europe's Jules Automated Transfer Vehicle arrived at Kourou, French Guiana after a two-week voyage from Rotterdam...

  • Observations of Seven African Easterly Waves in the East Atlantic during 2006. Zawislak, Jonathan; Zipser, Edward J. // Journal of the Atmospheric Sciences;Jan2010, Vol. 67 Issue 1, p26 

    The African Monsoon Multidisciplinary Analyses (AMMA) experiment and its downstream NASA extension, NAMMA, provide an unprecedented detailed look at the vertical structure of consecutive African easterly waves. During August and September 2006, seven easterly waves passed through the NAMMA...

  • Validation of Satellite-Based Objective Overshooting Cloud-Top Detection Methods Using CloudSat Cloud Profiling Radar Observations. Bedka, Kristopher M.; Dworak, Richard; Brunner, Jason; Feltz, Wayne // Journal of Applied Meteorology & Climatology;Oct2012, Vol. 51 Issue 10, p1811 

    Two satellite infrared-based overshooting convective cloud-top (OT) detection methods have recently been described in the literature: 1) the 11- μm infrared window channel texture (IRW texture) method, which uses IRW channel brightness temperature (BT) spatial gradients and thresholds, and 2)...

  • Convective transport of very-short-lived bromocarbons to the stratosphere. Q. Liang; Atlas, E.; Blake, D.; Dorf, M.; Pfeilsticker, K.; Schauffler, S. // Atmospheric Chemistry & Physics Discussions;2014, Vol. 14 Issue 1, p651 

    We use the NASA GEOS Chemistry Climate Model (GEOSCCM) to quantify the contribution of two most important brominated very short-lived substances (VSLS), bromoform (CHBr3) and dibromomethane (CH2Br2), to stratospheric bromine and its sensitivity to convection strength. Model simulations suggest...

  • Simulation and Interpretation of the Genesis of Tropical Storm Gert (2005) as Part of the NASA Tropical Cloud Systems and Processes Experiment. Braun, Scott A.; Montgomery, Michael T.; Mallen, Kevin J.; Reasor, Paul D. // Journal of the Atmospheric Sciences;Apr2010, Vol. 67 Issue 4, p999 

    Several hypotheses have been put forward for the mechanisms of generation of surface circulation associated with tropical cyclones. This paper examines high-resolution simulations of Tropical Storm Gert (2005), which formed in the Gulf of Mexico during NASA’s Tropical Cloud Systems and...

  • NASA ION THRUSTER sets endurance record.  // Machine Design;9/19/2013, Vol. 85 Issue 12, p14 

    The article reports that the U.S. National Aeronautics and Space Administration's (NASA) Evolutionary Xenon Test thruster (NEXT) completed 5.5 years in a vacuum chamber at the Glenn Research Center in Cleveland. The thruster works by using electricity to ionize xenon, then accelerating the ions...

  • Electron demagnetization and collisionless magnetic reconnection in βe<1 plasmas. Scudder, J. D.; Mozer, F. S. // Physics of Plasmas;Sep2005, Vol. 12 Issue 9, p092903 

    Abrupt, intense electric field enhancements (EFEs) with E>100 mV/m surveyed over 3 years of NASA's Polar spacecraft data are used to illustrate the occurrence and locales of nonguiding center demagnetization of thermal electrons in strongly inhomogeneous electric fields. A lower bound E*(a) on...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics