Predicting Seasonal Tornado Activity

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1 Predicting Seasonal Tornado Activity James B. Elsner Department of Geography, Florida State University Tallahassee, FL, USA January 11, 2016 AMS Annual Meeting New Orleans, LA Tyler Fricker, Holly M. Widen, Thomas H. Jagger, Victor Mesev

2 Motivation Climate models do not predict tornadoes Models can be used to predict necessary conditions But necessary does not imply sufficient Needed are evidence-based analysis and models Establish a baseline level of skill then a forecast model Outline: Spatial model (county level) Space-time model (grid level)

3 Climate effects on tornadoes vary spatially Annual Number of Tornadoes [ ] El Nino Neutral La Nina Kansas Tennessee

4 Reliability of tornado records vary over time Systematic Tabulation of Tornado Data Tornado Watch and Warning Program Tornado Spotter Network Fujita Scale Discovery of Microbursts Doppler Radar Mobile Radar Enhanced Fujita Scale Year

5 Annual number of tornado reports (Kansas) 200 Number of EF0+ Tornadoes Year

6 Cheyenne Rawlins Decatur Norton Phillips Smith Jewell Republic Washington Marshall Brown Nemaha Doniphan Sherman Thomas Cloud Atchison Sheridan Graham Rooks Osborne Mitchell Clay Pottawatomie Jackson Riley Jefferson Leavenworth Ottawa Wyandott Wallace Logan Lincoln Gove Shawnee Trego Ellis Geary Russell Wabaunsee Dickinson Douglas Johnson Saline Ellsworth Morris Greeley Osage Wichita Scott Lane Ness Rush Franklin Miami Barton Lyon Rice McPherson Marion Chase Pawnee Coffey Anderson Linn Hamilton Kearny Finney Hodgeman Stafford Harvey Edwards Reno GreenwoodWoodson Allen Gray Bourbon Ford Butler Stanton Grant Haskell Pratt Sedgwick Kiowa Kingman Wilson Neosho Crawford Elk Morton Stevens Seward Meade Clark Comanche Barber Harper Sumner Cowley Chautauqua MontgomeryLabette Cherokee Population Density [persons per square km]

7 Number of EF0+ Tornadoes ( )

8 Number of EF0+ Tornado Days ( )

9 Observed Poisson 30 Number of Counties Number of Tornadoes

10 The number of tornado reports in each cell (T s ) is assumed to follow a negative binomial distribution with mean (µ s ) T s µ s, r s NegBin(µ s, r s ) µ s = A s exp(ν s ) ν s = β 0 + β 1 lpd s + β 2 (t t 0 ) + β 3 lpd s (t t 0 ) + u s + v t r s = A s n where NegBin(µ s, r s ) indicates that the conditional tornado counts (T s µ s, r s ) are described by a negative binomial distribution with mean µ s and size r s, lpd s represents the base two logarithm of the population density during 2012 for each county, and t 0 is the base year set to 1991 (middle year of the record).

11 The spatially correlated random effects u s follows an intrinsic Besag formulation with a sum-to-zero constraint. u i {u j,j i, τ} N 1 1 u j, τ, m i m i where N is the normal distribution with mean 1/m i i j u j and variance 1/m i 1/τ where m i is the number of neighbors of cell i and τ is the precision; i j indicates cells i and j are neighbors. Neighboring cells are determined by contiguity (queen s rule). The annual uncorrelated random effect, v t, is modeled as a sequence of normally distributed random variables, with mean zero and variance 1/τ. i j

12 Number of EF0+ Tornadoes ( )

13 Expected Annual Per County Tornado (EF0+) Rate

14 Tornado (EF0+) Occurrence Rate [% Difference from Statewide Avg]

15 Oklahoma km Number of EF0+ Tornadoes ( )

16 0 100 km Expected Annual Tornado (EF0+) Rate

17 A space-time model

18 44 N 42 N 40 N 38 N 36 N 34 N 32 N N 42 N 40 N 38 N 36 N 34 N 32 N W 90 W 85 W 100 W 90 W 85 W Number of Tornadoes

19 A B 44 N 44 N 42 N 42 N 40 N 40 N 38 N 38 N 36 N 36 N 34 N 34 N 32 N 32 N 100 W 95 W 90 W 85 W 100 W 95 W 90 W 85 W ENSO Effect on Tornadoes [% Change in Rate/S.D. Increase in ENSO Index] Signficance Level

20 Annual Tennessee Tornado Fatalities by ENSO Phase [ ] El Nino Neutral La Nina 10 1

21 Other predictors PNA Global wind oscillation NAO

22 Government efforts toward seasonal prediction of severe weather in the United States Last March scientists held a workshop in D.C. to assess the feasibility of developing severe weather outlooks on sub-seasonal & seasonal timescales. Two notable recommendations were made: 1. Experimental seasonal weather outlook will be issued sometime this spring, and 2. Research activities for improving outlooks should be supported.

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