526  
FLUS73 KOAX 192153  
AWUOAX  
 
AREA WEATHER UPDATE  
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE  
453 PM CDT WED APR 19 2017  
 
IAZ043-055-056-069-079-080-090-091-NEZ034-044-045-050>053-065>068-  
078-088>093-200000-  
MONONA-HARRISON-SHELBY-POTTAWATTAMIE-MILLS-MONTGOMERY-FREMONT-  
PAGE-BURT-DODGE-WASHINGTON-BUTLER-SAUNDERS-DOUGLAS-SARPY-SEWARD-  
LANCASTER-CASS-OTOE-SALINE-JEFFERSON-GAGE-JOHNSON-NEMAHA-PAWNEE-  
RICHARDSON-  
INCLUDING THE CITIES OF ONAWA, MAPLETON, MISSOURI VALLEY,  
WOODBINE, LOGAN, DUNLAP, HARLAN, COUNCIL BLUFFS, GLENWOOD,  
RED OAK, SIDNEY, HAMBURG, TABOR, FARRAGUT, CLARINDA, SHENANDOAH,  
TEKAMAH, OAKLAND, LYONS, DECATUR, FREMONT, BLAIR, DAVID CITY,  
WAHOO, ASHLAND, YUTAN, OMAHA, BELLEVUE, PAPILLION, LA VISTA,  
SEWARD, MILFORD, LINCOLN, PLATTSMOUTH, NEBRASKA CITY, CRETE,  
WILBER, FAIRBURY, BEATRICE, TECUMSEH, STERLING, AUBURN,  
PAWNEE CITY, TABLE ROCK, AND FALLS CITY  
453 PM CDT WED APR 19 2017  
 
...WARNING DECISION UPDATE FOR EASTERN NEBRASKA AND SOUTHWEST  
IOWA...  
 
CONVECTION HAS BEGUN TO DEVELOP ALONG SURFACE BOUNDARY THAT  
EXTENDS FROM WAHOO SOUTHWESTWARD TO SOUTHWEST OF SEWARD. THIS  
ACTIVITY WILL CONTINUE TO DEVELOP AND BECOME SEVERE QUICKLY.  
GREATEST THREAT WILL BE VERY LARGE HAIL AND AN ISOLATED TORNADO.  
GREATEST CONCERN FOR TORNADO DEVELOPMENT IS ALONG SURFACE WARM  
FRONT THAT EXTENDS FROM EAST-WEST ACROSS DOUGLAS COUNTY TO  
NORTHERN POTTAWATTAMIE COUNTY. SURFACE ANALYSIS INDICATES A  
SURFACE LOW WEST OF THE VALLEY NWS OFFICE. THIS LOW WILL MOST  
LIKLY CONTINUE MOVING EAST NORTHEAST ALONG THE WARM FRONT. THIS  
AREA ALSO HAS THE GREATEST EFFECTIVE BULK SHEAR AROUND 60 KT...AND  
EFFECTIVE HELICITY OVER 30. ANY STORM THAT DEVELOPS IN THIS  
FAVORABLE SHEAR ENVIRONMENT ALONG THE WARM FRONT HAS A HIGH  
PROBABILITY OF BECOMING TORNADIC DURING THE NEXT COUPLE OF HOURS.  
 

 
 
CLICK HERE TO GO TO PREVIOUS BULLETINS.

The Nexlab NE Page
The Nexlab IA Page Main Text Page