Showing posts with label Tornado statistics. Show all posts

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J.I. Belanger, J.A. Curry, C.D. Hoyos, GRL 36 (2009): Variability in tornado frequency associated with U.S. landfalling tropical cyclones

Geophysical Research Letters, 36 (2009) L17805; doi:10.1029/2009GL040013.

Variability in tornado frequency associated with U.S. landfalling tropical cyclones

James I. Belanger, Judith A. Curry, and Carlos D. Hoyos (School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, U.S.A.)

Abstract

A statistical model for tornado frequency from Gulf of Mexico landfalling tropical cyclones (TCs) is developed using TC size, intensity, recurvature, and mid-level specific humidity data. New datasets are assembled for tornado frequency and for TC size at landfall as measured by the radius of outer closed isobar and distance of tornado from the TC center. Owing to systematic undercounting of tornadoes, the model is used to reconstruct the TC tornado climatology back to 1948, and further back to 1920 using a modified model that does not include mid-level specific humidity. Relative to the previous active period for Gulf TC landfalls of 1948–1964, the active period since 1995 has seen a statistically significant increase (95% level) in median TC tornadoes and in the frequency of large TC tornado outbreaks. These changes are linked to an increase in the median size and frequency of large Gulf landfalling TCs.

(Received 9 July 2009; accepted 5 August 2009; published 3 September 2009.)

Belanger, J. I., J. A. Curry, & C. D. Hoyos (2009), Variability in tornado frequency associated with U.S. landfalling tropical cyclones, Geophysical Research Letters, 36, L17805; doi:10.1029/2009GL040013.

Link to abstract: http://www.agu.org/pubs/crossref/2009/2009GL040013.shtml

Written by fatih al-farahat in


NOAA: Annual and Monthly Tornado Statistics

Readers, be sure an update your link to the graph of the annual tornado statistics. NOAA appears to be changing things around, perhaps even for the better.

http://www.spc.noaa.gov/wcm/

But if you do a google search for "tornado statistics," it will still most likely lead you back to the old page which has incomplete tables, especially no titles for the column headings.

Storm Prediction Center WCM Page
Intro | Tornado Graphs & Charts | SPC Watch Frequency Maps | 2008 Map | 2007 Map | SPC AWIPS Products | Data
Warning Coordination Meteorologist's Introduction

Welcome to the WCM Page for the SPC. This page has charts of the latest preliminary severe storm reports, annual summaries, and links to comma-separated-value (csv) data files from the SPC severe weather database back to 1950. As time allows, this page may occasionally serve as a place for preliminary severe weather event assessments.

For additional insight into severe thunderstorms and tornado reports, the SPC and the National Severe Storms Laboratory are collaborating on posting non-operational "feature" content to the U.S. Severe Weather Blog, hosted by NOAA Public Affairs in Norman, Oklahoma.

Greg Carbin
Warning Coordination Meteorologist
NWS/NCEP Storm Prediction Center
Annual Running Totals (Updated Frequently)
Tornado Reports | Hail Reports | Wind Reports
Annual Tornado Running Totals
Plot of the annual running total of tornado reports compared to inflation adjusted values. (Click on graph for a full description.)

Annual Tornado Trends
Actual (adjusted) annual tornado reports compared to prior years. (Click on graph for full resolution version.)

SPC Average Annual Watch Frequency Maps
Tornado Watches
Average number of tornado watches per year (1999-2008). (Click for full-resolution version.)
 Severe Thunderstorm Watches
Average number of severe thunderstorm watches per year (1999-2008). (Click for full-resolution version.)


SPC 2008 Tornado Tracks Map
2008 Tornado Tracks
U.S. map depicting tornado tracks colored by EF-Scale for 2008. (Click on graph for full-resolution version.)


2008 Tornado Graph
Plot of 2008 daily tornado events the annual trend. (Click on graph for full-resolution version.)

SPC 2007 Tornado Tracks Map
2007 Tornado Tracks
U.S. map depicting tornado tracks colored by EF-Scale for 2007. (Click on graph for full-resolution version.)


2007 SPC Tornado Chart
Chart depicting tornado events and total annual trend for 2007. (Click on graph for full-resolution version.)


SPC Tornado and Severe Weather Statistical Products on AWIPS

Monthly Tornado Statistics are maintained in the AWIPS product STAMTS. Use this product to find out how many tornadoes have occured so far this year and how this year compares to past years.

Killer Tornado Statistics are listed in the AWIPS product STATIJ. Use this product for information about killer tornadoes this year and in the past.