FONT11 KNHC 202031 
PWSAT1 
 
TROPICAL STORM ARLENE WIND SPEED PROBABILITIES NUMBER 6 
NWS NATIONAL HURRICANE CENTER MIAMI FL AL012017 
2100 UTC THU APR 20 2017 
 
AT 2100Z THE CENTER OF TROPICAL STORM ARLENE WAS LOCATED NEAR 
LATITUDE 37.7 NORTH...LONGITUDE 42.0 WEST WITH MAXIMUM SUSTAINED 
WINDS NEAR 40 KTS...45 MPH...75 KM/H. 
 
Z INDICATES COORDINATED UNIVERSAL TIME (GREENWICH) 
 ATLANTIC STANDARD TIME (AST)...SUBTRACT 4 HOURS FROM Z TIME 
 EASTERN DAYLIGHT TIME (EDT)...SUBTRACT 4 HOURS FROM Z TIME 
 CENTRAL DAYLIGHT TIME (CDT)...SUBTRACT 5 HOURS FROM Z TIME 
 
WIND SPEED PROBABILITY TABLE FOR SPECIFIC LOCATIONS 
 
CHANCES OF SUSTAINED (1-MINUTE AVERAGE) WIND SPEEDS OF AT LEAST 
 ...34 KT (39 MPH... 63 KM/H)... 
 ...50 KT (58 MPH... 93 KM/H)... 
 ...64 KT (74 MPH...119 KM/H)... 
FOR LOCATIONS AND TIME PERIODS DURING THE NEXT 5 DAYS 
 
PROBABILITIES FOR LOCATIONS ARE GIVEN AS OP(CP) WHERE 
 OP IS THE PROBABILITY OF THE EVENT BEGINNING DURING 
 AN INDIVIDUAL TIME PERIOD (ONSET PROBABILITY) 
 (CP) IS THE PROBABILITY OF THE EVENT OCCURRING BETWEEN 
 18Z THU AND THE FORECAST HOUR (CUMULATIVE PROBABILITY) 
 
PROBABILITIES ARE GIVEN IN PERCENT 
X INDICATES PROBABILITIES LESS THAN 1 PERCENT 
PROBABILITIES FOR 34 KT AND 50 KT ARE SHOWN AT A GIVEN LOCATION WHEN 
THE 5-DAY CUMULATIVE PROBABILITY IS AT LEAST 3 PERCENT. 
PROBABILITIES FOR 64 KT ARE SHOWN WHEN THE 5-DAY CUMULATIVE 
PROBABILITY IS AT LEAST 1 PERCENT. 
 
 
 - - - - WIND SPEED PROBABILITIES FOR SELECTED LOCATIONS - - - - 
 
 FROM FROM FROM FROM FROM FROM FROM 
 TIME 18Z THU 06Z FRI 18Z FRI 06Z SAT 18Z SAT 18Z SUN 18Z MON 
PERIODS TO TO TO TO TO TO TO 
 06Z FRI 18Z FRI 06Z SAT 18Z SAT 18Z SUN 18Z MON 18Z TUE 
 
FORECAST HOUR (12) (24) (36) (48) (72) (96) (120) 
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
LOCATION KT