TABLE 2 

 Varlftb^es \i8«d fdr the input to the screening-regression technique 



(Travelers) 



Variable 



Unit 



Description 



9 



deg 



Latitude 



X 



dag 



Longitude 



^a 



°F 



Air temperature 



Ts 



°F 



Sea-surfoce temperature 



Hour 



- 



Derived from hour: OOZ =0; 12Z = 1 



sfn (6"V fi»nth) 



- 



Derived from month; Jan. = 1j Feb. = 2; etc. 



cos (6"V month) 



- 



Derived from month: Jan. = 1j Feb. = 2; etc. 



Ts 



°F 



Monthly mean sea-surface temperature 



X sin (6"V month) 



- 



- 



X cos (6"^ IT month) 



- 



- 



e sin (6"''ir month) 



- 



- ■ 



cos (6"'jr month) 



- 



- 



0\ 



- 



- 



Ta - Ts 



°F 



- 



(Ta - ^sf 



rF)2 



- 



'''7-10 



°F 



Mean virtual temperature of the 700-1000-mb layer: 

 17.10= 1-8 [0.029197 (Z700 - Ziooo) - 255.'tl 



'j's - T7-IO 



°F 



- 



(Ts - T7.10)' 



(•F)2 



- 



^12 ^1000 



12-1 ft hr-1 



12-hr 1000-mb height change 



6122700 



12-'' ft hr-l 



12-hr 700-mb height change 



^12 '''7-10 



12-1 'F hr-1 



12-hr 700-IOOO-mb mean virtual temperature change: 

 5l2 T7.10 = 0.5255^6 (&12 Z700 - ^12^1 000) 



^1000 



.sec-1 



1000-mb geostrophic relative vorticity*t: 

 ^1000 = 9^"'' 'Cf Zipoo 



?700 



sec-1 



700-mb geostrophic relative vorticity*!: 

 ?700 = 9*-'' ^ Z700 



*f = Coriol is parameter ■ 2n sin 0. 



tAII space derivatives are computed by centered f inite-di f ference approximations over 2 

 grid intervals. 



