Operational Use and Development of a High-Resolution Mesoscale Model in the Colorado
Mountain Region for Wintertime and Other Forecast Applications
The overall objective is to enhance operational forecasting procedures and techniques,
through the use of a high-resolution mesoscale forecast model, for weather that
significantly impacts public activities in the Intermountain West. The emphasis
is on improved forecasting of phenomena related to winter storms, including quantitative
precipitation forecasting (QPF), snow depth, blizzards, blowing snow, and icing
conditions.
Funded by: University Corp. for Atmospheric Research/Cooperative Prog.
For Operational Meteorology, Education and Training.
For more information contact
Israel Jirak
Sensitivity of the North American Monsoon to Soil Moisture and Vegetation,
and its Telecommunication Mechanisms into the U.S.: A Modeling Study
This research focuses on the following goals:
1) Examine positive potential vorticity anomalies generated by monsoon
convection as a telecommunication mechanism between convection over Northern Mexico during
monsoon surges and convection/mesoscale convective systems over the central U.S.
2) Examine the relative influence and dynamics of LLJs and the monsoon boundary later on
the evolution of precipitating systems associated with the North American Monsoon (NAM)
3) Examine the sensitivity of the NAM to soil moisture, SSTs and vegetation. Plans
are to continue regional simulations of the evolution of the NAM for selected years using
RAMS and to perform sensitivity studies with the model.
Funded by: National Oceanic and Atmospheric Adm.
For more information contact
Steve Saleeby
Retrieval of Cloud Nucleating Aerosol Concentrations using
an Ensemble Kalman Filter - A Feasibility Study
It is proposed to implement an ensemble Kalman filter to
examine the feasibility of retrieving cloud condensation nuclei (CCN), giant
CCN (GCCN), and ice forming nuclei (IFN) concentrations in regions where boundary
layer clouds are prevalent. Two models will be used as part of this process.
One is a two-dimensional cloud-resolving model (CRM) which contains mixed phase
microphysics. The second model is a probability density function (PDF)-based
single-column model of the cloudy boundary.
Funded by: National Aeronautics and Space Adm.
For more information contact
Gustavo Carrio
Numerical Simulation and Analysis of Severe Storms and
Mesoscale Convective Systems
This research focuses on the following:
1) Performed a detailed observational analysis of the environment in which
MCSs initiate and develop with a focus on their predictability
2) Examination of the impacts of forward flank downdraft (FFD) and rear flank downdraft
(RFD) cold-pool variability on mesocyclones and near-surface tornado-like vorticity in
simulated supercell tornado-producing stroms
3) Performed airborne Doppler radar analysis of derecho cases observed in the Bow Echo
and MCV Experiment (BAMEX)
4) Examined microphysical influences on supercell storms.
The broader impacts of this research will be on the short range prediction of severe
storms amd MCSs, including tornadoes, rainfall and severe winds.
Funded by: National Science Foundation
For more information contact
Dr. William Cotton
Urban Influences on Clouds, Precipitation and Lightning
The proposed research focuses on the following topics:
1) Modeling the affects of enhanced cloud condensation nuclei and giant cloud
condensation nuclei concentrations on afternoon Convection over St. Louis, MO
2) Case study modeling of urban impacts on organized mesoscale convective systems (MCSs)
passing over St. Louis, MO
3) Idealized modeling of urban impacts on organized MCSs; Participation in the HEAT field
campaign
4) Modeling urban impacts on convection and cloud structures favorable for
lightning over Houston, Texas
Funded by: National Science Foundation
For more information contact
Sue Van Den Heever
Aerosol/Boundary Layer Cloud Interactions-Simulations and
Parameterization Testing
Our Research Focuses on:
1) Large-eddy simulation (LES) of RICO cases for testing the microphysics
model and testing the PDF single-column model and furthering our fundamental understanding of
aerosol cloud interactions in the trade wind regime
2) Further development, calibration and testing fo the CCN, GCCN and IN aerosol source
and transport model
3) Further development of the PDF single-column model interfaced to the Regional
Atmospheric Modeling System (RAMS) microphysics
4) Participation in GEWEX Cloud System Study (GCSS) Working Group #1
Funded by: National Science Foundation
For more information contact
Dr. William Cotton
DoD Center for Geosciences/Atmospheric Research Modeling and
Assimilation in Very Cloudy Conditions
This CG/AR research project has the following goals:
1) Improve boundary layer cloud simulations and aerosol direct and indirect
effects in climate models
2) Improve air quality prediction
3) Commerce and Transportation - Should improve forecasts of hazardous aviation weather
associated with clouds, fog and dust
Funded by: Department of Defense
For more information contact
Dr. William Cotton
Collaborative Research: Inhibition of Snofall by Pollution Aerosols
This NSF project seeks to examine the impact of cloud condensation nuclei (CCN), giant-CCN (GCCN), and ice forming nuclei (IFN) upon the snowpack over Colorado during the winter season. The Regional Atmospheric Modeling System (RAMS) is being utilized to perform high resolution mesoscale simulations (750m grid spacing) focused over the Storm Peak Lab (SPL) observatory at Steamboat Springs, Colorado. Several significant snowfall events during the winter of 2004-2005 are being targeted as cases during which SPL recorded data on aerosol, cloud and ice spectra, as well as snowfall rate and meteorological conditions. Sensitivity studies with varying aerosol concentrations, as well as the verification data from SPL, will help provide a solid understanding of potential pollution impacts on Colorado snowfall.
Funded by: National Science Foundation
For more information contact
Steve Saleeby