Abstract
The interactions between an Appalachian cold-air damming event and the near passage of Tropical Storm Kyle (2002) along the coastal Carolinas are assessed by using a numerical weather prediction model. As the storm moved along the coastline, it began extra-tropical transition, bringing heavy rains to both the coastal region and inland towards the Piedmont of North Carolina. Our goal is to quantify the effects of both interacting weather systems on heavy precipitation to improve the dynamical understanding of such effects, as well as precipitation forecasts in the study region. A series of sensitivity tests were performed to isolate and quantify the effects of both systems on the total accumulated precipitation. It was found that (a) for this type of along-coast track, the pre-existing cold-air damming played only a minor role on the total accumulated precipitation, (b) the outer circulation of Kyle weakened the cold-air damming due to a redirection of the mean flow away from the east side of the Appalachian Mountains, and (c) the combination of Kyle with a shortwave mid- to upper-level trough and a surface coastal front were responsible for the heavy precipitation experienced in the study area through the advection of moisture, vorticity, and the forcing of upward motion.
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Abbreviations
- ADR:
-
Appalachian Damming Region
- B03:
-
Bailey et al. (2003)
- CAD:
-
Cold-air damming
- CF:
-
Coastal front
- CPC:
-
Climate Prediction Center
- CTL:
-
Control case
- dBZ:
-
Reflectivity
- DC:
-
District of Columbia
- ERA-I:
-
ERA-Interim global reanalysis dataset
- ET:
-
Extra-tropical transition
- FLAT:
-
No-mountain case
- GA:
-
Georgia
- NARR:
-
North American Regional Reanalysis
- NC:
-
North Carolina
- NE:
-
Northeast
- NHC:
-
National Hurricane Center
- NS:
-
No-storm case
- PVA:
-
Positive vorticity advection
- SB09:
-
Srock and Bosart (2009)
- SC:
-
South Carolina
- SE:
-
Southeast
- SLP:
-
Sea level pressure
- SST:
-
Sea surface temperature
- TC:
-
Tropical Cyclone
- TN:
-
Tennessee
- VA:
-
Virginia
- VORTMAX:
-
Vorticity maximum
- WRF-ARW:
-
Weather Research and Forecast Model – Advanced Research WRF
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Acknowledgments
The authors would like to acknowledge Barrett Smith and Jonathan Blaes at the National Weather Service office in Raleigh, NC, for their insights and ideas on the topic presented in this paper. The comments from three anonymous reviewers are highly appreciated, which helped improving the quality of the paper. We are also grateful to Dr. John Hemphill’s review of the manuscript. This research was supported by the National Science Foundation Awards AGS-1265783, HRD-1036563, CNS-1126543, and CNS-1429464.
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Garcia-Rivera, J.M., Lin, YL. & Rastigejev, Y. Tropical Storm Kyle (2002) and cold-air damming: their interactions and impacts on heavy rainfall in the Carolinas. Meteorol Atmos Phys 128, 347–372 (2016). https://doi.org/10.1007/s00703-015-0421-1
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DOI: https://doi.org/10.1007/s00703-015-0421-1