Satellite Radar Studies of Extreme Convective Storms ? ? New Fellows Presentation, AGU, San...
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![Page 1: Satellite Radar Studies of Extreme Convective Storms ? ? New Fellows Presentation, AGU, San Francisco, 5 December 2012 Robert A. Houze, Jr. University.](https://reader033.fdocuments.in/reader033/viewer/2022051416/56649ea05503460f94ba2adf/html5/thumbnails/1.jpg)
Satellite Radar Studies of Extreme Convective
Storms
?Himalayas
Andes
Rockies
New Fellows Presentation, AGU, San Francisco, 5 December 2012
Robert A. Houze, Jr.University of Washington
![Page 2: Satellite Radar Studies of Extreme Convective Storms ? ? New Fellows Presentation, AGU, San Francisco, 5 December 2012 Robert A. Houze, Jr. University.](https://reader033.fdocuments.in/reader033/viewer/2022051416/56649ea05503460f94ba2adf/html5/thumbnails/2.jpg)
Radars in Space
TRMM1997-
CloudSat
2006-
![Page 3: Satellite Radar Studies of Extreme Convective Storms ? ? New Fellows Presentation, AGU, San Francisco, 5 December 2012 Robert A. Houze, Jr. University.](https://reader033.fdocuments.in/reader033/viewer/2022051416/56649ea05503460f94ba2adf/html5/thumbnails/3.jpg)
Typical Tropical Convective Cloud Population
TRMM
2 cm wavelength
CloudSat
3 mm wavelength
![Page 4: Satellite Radar Studies of Extreme Convective Storms ? ? New Fellows Presentation, AGU, San Francisco, 5 December 2012 Robert A. Houze, Jr. University.](https://reader033.fdocuments.in/reader033/viewer/2022051416/56649ea05503460f94ba2adf/html5/thumbnails/4.jpg)
JJAS DJF
Locations of the deepest and most intense convective cores seen by TRMM over ~14 years in South Asia and South America warm seasons
Near the large mountain ranges
Romatschke et al. 2010 Romatschke and Houze 2010
![Page 5: Satellite Radar Studies of Extreme Convective Storms ? ? New Fellows Presentation, AGU, San Francisco, 5 December 2012 Robert A. Houze, Jr. University.](https://reader033.fdocuments.in/reader033/viewer/2022051416/56649ea05503460f94ba2adf/html5/thumbnails/5.jpg)
Relationship to Mountain Ranges and Moisture Sources
?
Andes
HimalayasRockies
How similar are the storms in these three regimes?
![Page 6: Satellite Radar Studies of Extreme Convective Storms ? ? New Fellows Presentation, AGU, San Francisco, 5 December 2012 Robert A. Houze, Jr. University.](https://reader033.fdocuments.in/reader033/viewer/2022051416/56649ea05503460f94ba2adf/html5/thumbnails/6.jpg)
The North American Case
![Page 7: Satellite Radar Studies of Extreme Convective Storms ? ? New Fellows Presentation, AGU, San Francisco, 5 December 2012 Robert A. Houze, Jr. University.](https://reader033.fdocuments.in/reader033/viewer/2022051416/56649ea05503460f94ba2adf/html5/thumbnails/7.jpg)
Carlson et al. 1983
moist
Texas
dry,hot
MexicanPlateau
Gulf ofMexico
![Page 8: Satellite Radar Studies of Extreme Convective Storms ? ? New Fellows Presentation, AGU, San Francisco, 5 December 2012 Robert A. Houze, Jr. University.](https://reader033.fdocuments.in/reader033/viewer/2022051416/56649ea05503460f94ba2adf/html5/thumbnails/8.jpg)
Something similar happens to extreme convective cores in the
western region of South Asia
![Page 9: Satellite Radar Studies of Extreme Convective Storms ? ? New Fellows Presentation, AGU, San Francisco, 5 December 2012 Robert A. Houze, Jr. University.](https://reader033.fdocuments.in/reader033/viewer/2022051416/56649ea05503460f94ba2adf/html5/thumbnails/9.jpg)
Sawyer 1947
![Page 10: Satellite Radar Studies of Extreme Convective Storms ? ? New Fellows Presentation, AGU, San Francisco, 5 December 2012 Robert A. Houze, Jr. University.](https://reader033.fdocuments.in/reader033/viewer/2022051416/56649ea05503460f94ba2adf/html5/thumbnails/10.jpg)
A case observed by TRMM
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TRMM PR Observations WRF Simulation
Medina et al. 2010
![Page 12: Satellite Radar Studies of Extreme Convective Storms ? ? New Fellows Presentation, AGU, San Francisco, 5 December 2012 Robert A. Houze, Jr. University.](https://reader033.fdocuments.in/reader033/viewer/2022051416/56649ea05503460f94ba2adf/html5/thumbnails/12.jpg)
Consistent with Sawyer 1947
Consistent with Sawyer
1947
Backward trajectories (HYSPLIT/NCEP)
2.5 km
1.0 km
Medina et al. 2010
Consistent with Sawyer 1947
![Page 13: Satellite Radar Studies of Extreme Convective Storms ? ? New Fellows Presentation, AGU, San Francisco, 5 December 2012 Robert A. Houze, Jr. University.](https://reader033.fdocuments.in/reader033/viewer/2022051416/56649ea05503460f94ba2adf/html5/thumbnails/13.jpg)
WRF Model Simulation
Mixing ratio CAPE
Medina et al. 2010
Surface wind
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Medina et al. 2010
WRF Simulation
Cloud just after convection formed in the model
Triggering is over foothills—consistent with satellite data
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A similarregime occurs near the Andes
![Page 16: Satellite Radar Studies of Extreme Convective Storms ? ? New Fellows Presentation, AGU, San Francisco, 5 December 2012 Robert A. Houze, Jr. University.](https://reader033.fdocuments.in/reader033/viewer/2022051416/56649ea05503460f94ba2adf/html5/thumbnails/16.jpg)
Convective Regimes in South AmericaIdentified by TRMM
Romatschke and Houze 2010
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Example of triggering over
the Sierra Cordóba range
Rasmussen & Houze 2011
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What the storm looked
like on the TRMM radar
Rasmussen and Houze 2011
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Vertical air motions
Low-level winds
COMPOSITEof average
conditions for storms with
intense convection
seen by the TRMM radar
downup
moistunstable
Rasmussen and Houze 2011
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Recap
SIMILARITIES
• Channeling of moisture
• Downwind capping
• Explosive triggeringDIFFERENCES
• Capping may be downslope from a plateau or response to flow over a ridge
• Triggering may be meteorological or orographic
?Himalayas
Andes
Rockies
LARGE MOUNTAIN RANGES NEAR WARM MOIST ZONES
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• Pakistan flood cases• Convection in the Madden-
Julian Oscillation• Storm systems over land and
ocean• Other…
Similar studies
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The future
?Himalayas
Andes
Rockies
This research was supported by NASA grants NNX10AH70G, NNX10AM28G,
and NSF grant AGS1144105
TRMM
GPM
Next generation:
Radars need to be in the same orbit!
CloudSat EarthCare
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End
?Himalayas
Andes
Rockies
This research was supported by NASA grants NNX10AH70G, NNX10AM28G,
and NSF grant AGS1144105
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End
?Himalayas
Andes
Rockies
This research was supported by NASA grants NNX10AH70G, NNX10AM28G,
and NSF grant AGS1144105
![Page 25: Satellite Radar Studies of Extreme Convective Storms ? ? New Fellows Presentation, AGU, San Francisco, 5 December 2012 Robert A. Houze, Jr. University.](https://reader033.fdocuments.in/reader033/viewer/2022051416/56649ea05503460f94ba2adf/html5/thumbnails/25.jpg)
Global Pattern of Deep Convection seen by TRMM
Zipser et al. 2006
Maximum height of TRMM’s most intense radar echoes