027  
FLUS44 KOUN 210905  
HWOOUN  
 
HAZARDOUS WEATHER OUTLOOK  
NATIONAL WEATHER SERVICE NORMAN OK  
405 AM CDT SAT OCT 21 2017  
 
OKZ004>048-050>052-TXZ083>090-220915-  
HARPER-WOODS-ALFALFA-GRANT-KAY-ELLIS-WOODWARD-MAJOR-GARFIELD-  
NOBLE-ROGER MILLS-DEWEY-CUSTER-BLAINE-KINGFISHER-LOGAN-PAYNE-  
BECKHAM-WASHITA-CADDO-CANADIAN-OKLAHOMA-LINCOLN-GRADY-MCCLAIN-  
CLEVELAND-POTTAWATOMIE-SEMINOLE-HUGHES-HARMON-GREER-KIOWA-JACKSON-  
TILLMAN-COMANCHE-STEPHENS-GARVIN-MURRAY-PONTOTOC-COAL-COTTON-  
JEFFERSON-CARTER-JOHNSTON-ATOKA-LOVE-MARSHALL-BRYAN-HARDEMAN-  
FOARD-WILBARGER-WICHITA-KNOX-BAYLOR-ARCHER-CLAY-  
405 AM CDT SAT OCT 21 2017  
 
THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHERN...  
WESTERN...CENTRAL...AND SOUTHERN OKLAHOMA...AND WESTERN NORTH  
TEXAS.  
   
DAY ONE...TODAY AND TONIGHT
 
 
   
THUNDERSTORMS
 
 
THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS  
OF NORTH CENTRAL, CENTRAL, AND SOUTHERN OKLAHOMA, AND WESTERN  
NORTH TEXAS. A SLIGHT AND MARGINAL RISK COVER MUCH OF THE REST OF  
THE AREA.  
 
LOCATION...  
THE ENHANCED RISK IS NEAR AND SOUTHEAST OF A LINE FROM MEDFORD  
AND FAIRVIEW, TO CLINTON AND ALTUS OKLAHOMA, TO CROWELL AND  
SEYMOUR TEXAS. THIS INCLUDES PLACES LIKE PONCA CITY, ENID, LAWTON,  
OKLAHOMA CITY METRO, ADA, AND ARDMORE OKLAHOMA, AND WICHITA FALLS  
TEXAS. THE SLIGHT AND MARGINAL RISKS ARE WEST OF THE ENHANCED  
RISK AND SOUTHEAST OF A LINE FROM BUFFALO TO ARNETT OKLAHOMA.  
 
IMPACTS...  
DAMAGING WIND GUSTS TO AROUND 80 MPH AND LARGE HAIL UP TO THE SIZE  
OF TENNIS BALLS ARE THE PRIMARY CONCERNS. THERE IS A LOW POTENTIAL  
FOR TORNADOES ACROSS PORTIONS OF CENTRAL AND SOUTHERN OKLAHOMA,  
AND WESTERN NORTH TEXAS.  
 
TIMING...  
THE MOST LIKELY TIME FOR SEVERE STORMS WILL BE FROM 3 PM TO 2 AM.  
THE MOST LIKELY TIME FOR A TORNADO, IF A TORNADO OCCURS, WILL BE  
FROM 3 PM TO 9 PM.  
 
DISCUSSION...  
A STRONG UPPER SYSTEM AND A COLD FRONT ARE EXPECTED TO AFFECT THE  
REGION TODAY AND TONIGHT. STORMS ARE EXPECTED TO INITIALLY DEVELOP  
NEAR THE COLD FRONT THIS AFTERNOON FROM PARTS OF NORTHERN INTO  
WESTERN OKLAHOMA. THUNDERSTORMS WILL THEN CONTINUE TO DEVELOP AS  
THE COLD FRONT MOVES ACROSS THE AREA THIS EVENING AND OVERNIGHT.  
THESE STORMS ARE EXPECTED TO FORM INTO ONE OR MORE LINES FAIRLY  
RAPIDLY. INITIALLY LARGE HAIL UP TO THE SIZE OF GOLF BALLS AND  
STRONG WIND GUSTS TO 70 MPH WILL BE THE MAIN CONCERNS BUT AS THE  
STORMS DEVELOP INTO LINES, DAMAGING WINDS WILL BECOME A GREATER  
CONCERN WITH WIND GUSTS TO AROUND 80 MPH POSSIBLE.  
 
OTHER MORE DISCRETE STORMS COULD DEVELOP IN PARTS OF SOUTHWEST  
OKLAHOMA AND WESTERN NORTH TEXAS LATER THIS AFTERNOON NEAR A  
SURFACE LOW, THE FRONT, AND DRYLINE. LARGE HAIL UP TO THE SIZE OF  
TENNIS BALLS AND WIND GUSTS TO 70 MPH WILL BE THE MAIN CONCERNS  
WITH THESE STORMS. HOWEVER, THERE WILL ALSO BE A LOW POTENTIAL FOR  
A TORNADO OR TWO WITH THESE STORMS. EVENTUALLY, THESE STORMS ARE  
EXPECTED TO MERGE INTO LINE SEGMENTS AS WELL, WITH THE DAMAGING  
WIND POTENTIAL BECOMING A GREATER CONCERN. THE TORNADO POTENTIAL  
IS EXPECTED TO DECREASE LATER THIS EVENING.  
 
THE POTENTIAL FOR SEVERE STORMS WILL DECREASE OVERNIGHT BUT  
THUNDERSTORMS WILL REMAIN POSSIBLE THROUGH EARLY SUNDAY.  
   
SPOTTER AND EMERGENCY MANAGEMENT STATEMENT
 
 
STORM SPOTTER GROUPS AND EMERGENCY MANAGEMENT PERSONNEL ACROSS THE  
RISK AREAS SHOULD PREPARE FOR SEVERE WEATHER OPERATIONS LATE THIS  
AFTERNOON AND TONIGHT.  
   
DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY
 
 
   
THUNDERSTORMS
 
 
A FEW THUNDERSTORMS MAY LINGER IN PARTS OF SOUTHEAST OKLAHOMA  
SUNDAY MORNING BEFORE EXITING THE AREA.  
   
COLD/FROST
 
 
PATCHY FROST AND NEAR FREEZING TEMPERATURES MAY BE POSSIBLE ACROSS  
PORTIONS OF OKLAHOMA LATE NEXT WEEK.  
 
GET GRAPHICS AND MORE DETAILS AT WEATHER.GOV/NORMAN...AND FOLLOW  
OUR WEATHER FORECAST OFFICE ON TWITTER AND FACEBOOK.  
 

 
 
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