Conditions Supporting Funnel Cloud Development in Alaska

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DOI: 10.4236/acs.2017.72016    402 Downloads   505 Views  


The characteristics and climatology of funnel clouds in Alaska were examined using operational radiosondes, surface meteorological observations, and reanalysis data. Funnel clouds occurred under weak synoptic forcing between May and September between 11 am and 6 pm Alaska Daylight Time with a maximum occurrence in July. They occurred under Convective Available Potential Energy >500 J·kg-1 and strong low-level wind shear. Characteristic atmospheric profiles during funnel cloud events served to develop a retrieval algorithm based on similarity testing. Out of more than 129,000 soundings between 1971 and 2014, 2724, 442, and 744 profiles were similar to the profiles of observed funnel cloud events in the Interior, Alaska West Coast, and Anchorage regions. While the number of reported funnel clouds has increased since 2000, the frequency of synoptic situations favorable for such events has decreased.

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Edwin, S. , Mölders, N. , Friedrich, K. , Schmidt, S. and Thoman, R. (2017) Conditions Supporting Funnel Cloud Development in Alaska. Atmospheric and Climate Sciences, 7, 223-245. doi: 10.4236/acs.2017.72016.


[1] Edwin, S.G. (2016) Climatology and Forcing Mechanism of Funnel Clouds in Alaska. MS Thesis, Department of Atmospheric Sciences, University of Alaska Fairbanks, Fairbanks.
[2] von Storch, H. and Zwiers, F.W. (1999) Statistical Analysis in Climate Research. Cambridge University Press, Cambridge, 484 p.
[3] Shulski, M. and Wendler, G. (2007) The Climate of Alaska. University of Alaska Press, Fairbanks, 216 p.
[4] Mölders, N. and Kramm, G. (2007) Influence of Wildfire Induced Land-Cover Changes on Clouds and Precipitation in Interior Alaska—A Case Study. Atmospheric Research, 84, 142-168.
[5] Lin, Y.-L. (2007) Mesoscale Dynamics. Cambridge University Press, Cambridge.
[6] Houze, R.A. (2014) Cloud Dynamics. Vol. 104, Academic Press, Cambridge.
[7] Department of Commerce (2014) Stormevents.
[8] Bieniek, P.A., Walsh, J.E., Thoman, R.L. and Bhatt, U.S. (2014) Using Climate Divisions to Analyze Variations and Trends in Alaska Temperature and Precipitation. Journal of Climate, 27, 2800-2818.
[9] Kalnay, E., Kanamitsu, M., Kistler, R., Collins, W., Deaven, D., Gandin, L., et al. (1996) The NCEP/NCAR 40-Year Reanalysis Project. Bulletin of the American Meteorological Society, 77, 437-471.<0437:TNYRP>2.0.CO;2
[10] Kistler, R., Collins, W., Saha, S., White, G., Woollen, J., Kalnay, E., et al. (2001) The NCEP-NCAR 50-Year Reanalysis: Monthly Means CD-Rom and Documentation. Bulletin of the American Meteorological Society, 82, 247-267.<0247:TNNYRM>2.3.CO;2
[11] Office of the Federal Coordinator for Meteorological Services and Supporting Research (OFCM) (1997) Federal Meteorological Handbook No. 3: Rawinsonde and Pibal Observations. FCM-H3-1997, Washington DC, 191 p.
[12] Pielke, R.A. (2002) Mesoscale Meteorological Modeling. Academic Press, New York, 676 p.
[13] Mölders, N. (2011) Land-Use and Land-Cover Changes: Impact on Climate and Air Quality. Vol. 44, Springer Science & Business Media, Berlin, 193 p.
[14] Fujita, T.T. (1981) Tornadoes and Downbursts in the Context of Generalized Planetary Scales. Journal of Atmospheric Sciences, 38, 1511-1534.<1511:TADITC>2.0.CO;2
[15] Carbone, R.E. (1982) A Severe Frontal Rainband. Part I: Stormwide Hydrodynamic Structure. Journal of Atmospheric Science, 39, 258-279.<0258:ASFRPI>2.0.CO;2
[16] Mueller, C.K. and Carbone, R.E. (1987) Dynamics of a Thunderstorm Outflow. Journal of Atmospheric Sciences, 44, 1879-1898.<1879:DOATO>2.0.CO;2
[17] Wakimoto, R.M. and Wilson, J.W. (1989) Non-Supercell Tornadoes. Monthly Weather Review, 117, 1113-1140.<1113:NST>2.0.CO;2
[18] Weckwerth, T.M. and Wakimoto, R.M. (1992) The Initiation and Organization of Convective Cells Atop a Cold-Air Outflow Boundary. Monthly Weather Review, 120, 2169-2187.<2169:TIAOOC>2.0.CO;2
[19] Wilson, J.W., Foote, G.B., Crook, N.A., Frankhauser, J.C., Wade, C.G., Tuttle, J.D., et al. (1992) The Role of the Boundary-Layer Convergence Zones and Horizontal Rolls in the Initiation of Thunderstorms: A Case Study. Monthly Weather Review, 120, 1785-1815.<1785:TROBLC>2.0.CO;2
[20] Kingsmill, D.E. (1995) Convection Initiation Associated with a Sea-Breeze Front, a Gust Front, and Their Collision. Monthly Weather Review, 123, 2913-2933.<2913:CIAWAS>2.0.CO;2
[21] Arnott, N.R., Richardson, Y.P., Wurman, J.M. and Rasmussen, E.M. (2006) Relationship between a Weakening Cold Front, Misocyclones, and Cloud Development on 10 June 2002 during IHOP. Monthly Weather Review, 134, 311-335.
[22] Friedrich, K., Kingsmill, D.E. and Young, C.R. (2005) Misocyclone Characteristics Along Florida Gust Fronts during CAPE. Monthly Weather Review, 133, 3345-3367.
[23] Murphey, H.V., Wakimoto, R.M., Flamant, C. and Kingsmill, D.E. (2006) Dryline on 19 June 2002 during IHOP. Part I: Airborne Doppler and LEANDREII Analyses of the Thin Line Structure and Convection Initiation. Monthly Weather Review, 134, 406-430.
[24] Mölders, N. and Kramm, G. (2014) Lectures in Meteorology. Springer, Heidelberg, 591 p.
[25] Lee, B.D. and Wilhelmson, R.B. (1997) The Numerical Simulation of Non-Supercell Tornadogenesis. Part I: Initiation and Evolution of Pretornadic Misocyclone Circulation along a Dry Outflow Boundary. Journal of Atmospheric Science, 54, 32-60.<0032:TNSONS>2.0.CO;2
[26] Lee, B.D. and Wilhelmson, R.B. (1997) The Numerical Simulation of Non-Supercell Tornadogenesis. Part II: Evolution of a Family of Tornadoes along a Weak Outflow Boundary. Journal of Atmospheric Science, 54, 2387-2415.<2387:TNSONT>2.0.CO;2
[27] Bluestein, H.B. (1985) An Observational Study of a Mesoscale Area of Convection under Weak Synoptic-Scale Forcing. Monthly Weather Review, 113, 520-539.<0520:AOSOAM>2.0.CO;2
[28] Kondo, H. (1990) A Numerical Experiment on the Interaction between Sea Breeze and Valley Wind to Generate the So-Called “Extended Sea Breeze". Journal of the Meteorological Society of Japan, 68, 435-446.
[29] Kurita, H., Ueda, H. and Mitsumoto, S. (1990) Combination of Local Wind Systems under Light Gradient Wind Conditions and Its Contribution to Long-Range Transport of Air Pollutants. Journal of Applied Meteorology, 29, 331-348.<0331:COLWSU>2.0.CO;2
[30] US Census (2017).

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