Transcript Document 7471158

A Study of Landfalling Tropical
Storms
Alan F. Srock, Lance F. Bosart, and
John Molinari
University at Albany (SUNY)
Albany, NY 12222
NROW V – November 4, 2003
contact: [email protected]
Objectives
- Effects and Impacts of
- Fronts
- Orography
- Speed of Movement
- Vortex Evolution and Interaction
- Improve Precipitation Forecast
Data Sources
- NCEP/NCAR 6-hourly Global Reanalysis
- Unified Precipitation Dataset (UPD)
- Archived Surface Maps from DIFAX
(NMC/NCEP)
- Surface data from various datasets
available at NCAR/UCAR
Selection of Cases
- 70 Atlantic tropical cyclones made
landfall in the United States between
1972 and 1998
- 15 were selected for further study
- TS Chris (1988) and TS Marco (1990)
were chosen for this presentation
http://fermi.jhuapl.edu/states/us/big_us_color.gif
Overview of TS Chris
- 26-30 August 1988
- Short lifetime as a tropical storm
- Only named tropical cyclone in area
- East Coast track, east of Appalachians
- Re-intensification over the Northeast
Summary - TS Chris
- Lack of other nearby tropical cyclones
- Massive slow-moving trough over
Great Lakes
- Undergoes extratropical transition after
interaction with low-level system
- Secondary precip maximum over NE
US
Overview of TS Marco
- 9-13 October 1990
- Short lifetime as a tropical storm
- Other tropical cyclones in proximity
- East Coast track, east of Appalachians
- Cyclone does not reach the Northeast
Summary - TS Marco
- Moisture remnants from Klaus
- First trough may have caused
northward precipitation bulge
- Two trough interactions occurred, but
no extratropical transition with either
- Blocked from northward propagation
by Lili
Comparison &
Conclusions
- C: No other TCs in the vicinity
- M: Environment affected by earlier TC
- C: Single trough picked up low-level
cyclone, transitioning and moving NE
- M: Two troughs had opportunities to
transition Marco, although neither did
Future Work
- Look into effects of synoptically forced
front with Chris and coastal front
associated with Marco
- Examine other effects of multiple
cyclone centers in the Marco/Lili case
- Look into new datasets, including
NARR
References
- Climate Diagnostics Center (CDC) Daily Composite Plots.
Available at http://www.cdc.noaa.gov/Composites/Day/.
- Kalnay, E., et al., 1996: The NCEP/NCAR 40-Year
Reanalysis Project. Bulletin of the AMS, 77, 437-471.
- Morales, Ronald F. Jr., 1992: Evolution of a Long-Lived
Vortex of Tropical Storm Origin. Master's Thesis at
SUNY-Albany, 145 pp.
- Sheets, R. C., 1990: The National Hurricane Center –
Past, Present, and Future. Monthly Weather Review, 5,
185-232.