NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA

819 PM CDT THU MAY 30 2013

THE NATIONAL WEATHER SERVICE IN OMAHA HAS ISSUED A SEVERE THUNDERSTORM WARNING FOR…NORTHERN MILLS COUNTY IN SOUTHWEST IOWA…SOUTHEASTERN POTTAWATTAMIE COUNTY IN SOUTHWEST IOWA… UNTIL 900 PM CDT

* AT 818 PM CDT…A SEVERE THUNDERSTORM WAS LOCATED NEAR GLENWOOD…OR 18 MILES SOUTHEAST OF OMAHA…MOVING NORTHEAST AT 30 MPH. HAZARD…HALF DOLLAR SIZE HAIL. SOURCE…RADAR INDICATED. IMPACT…DAMAGE TO VEHICLES AND CROPS IS EXPECTED.

* LOCATIONS IMPACTED INCLUDE…GLENWOOD…TREYNOR…CARSON…PACIFIC JUNCTION…MACEDONIA…SILVER CITY AND HENDERSON.

PRECAUTIONARY/PREPAREDNESS ACTIONS…

FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A BUILDING.

NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA

803 PM CDT THU MAY 30 2013

THE NATIONAL WEATHER SERVICE IN OMAHA HAS ISSUED A SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN MILLS COUNTY UNTIL 830 PM CDT.  AT 800 PM CDT…A SEVERE THUNDERSTORM WAS LOCATED 19 MILES SOUTH OF OMAHA…MOVING NORTHEAST AT 15 MPH.

HAZARD…GOLF BALL SIZE HAIL.

SOURCE…RADAR INDICATED. AT 7:58 PM…2 INCH HAIL WAS REPORTED IN MANLEY, NE.

IMPACT…PEOPLE AND ANIMALS OUTDOORS WILL BE INJURED. EXPECT DAMAGE TO ROOFS…SIDING…WINDOWS…VEHICLES AND CROPS. LOCATIONS IMPACTED INCLUDE…BELLEVUE…OFFUTT AFB…PLATTSMOUTH…LOUISVILLE AND CEDAR CREEK.

PRECAUTIONARY/PREPAREDNESS ACTIONS…

PREPARE IMMEDIATELY FOR LARGE HAIL AND DEADLY CLOUD TO GROUND LIGHTNING. SEEK SHELTER INSIDE A WELL-BUILT STRUCTURE. STAY AWAY FROM WINDOWS.

ONAWA, Iowa (AP) — Stormy weather caused significant problems in the western Iowa city of Onawa, blowing down trees and damaging buildings. Onawa Mayor Bob Skelton told the Sioux City Journal that strong winds damaged many trees. Awnings also were ripped off, windows broken, a stoplight was knocked down and three street lights were damaged.

A wind gust also caused the front of a car dealership to collapse, sending concrete blocks onto two late-model vehicles. Knoepfler Chevrolet sales associate Garry Ellison says the gust lasted about 15 seconds. No one was injured in the dealership.

Police say most damage was confined to a nine-block area in the northwest part of town. National Weather Service meteorologist Dave Fobert says damage apparently was caused by a thunderstorm and not a tornado.

AREA COUNTIES: AUDUBON-GUTHRIE-DALLAS-CASS-ADAIR- MADISON-ADAMS-UNION-TAYLOR- 

1:08 PM CDT THU MAY 30 2013
 
 …FLASH FLOOD WATCH IS CANCELLED…
 
 THE FLASH FLOOD WATCH FOR PORTIONS OF CENTRAL IOWA…NORTH
 CENTRAL IOWA…SOUTH CENTRAL IOWA…SOUTHWEST IOWA AND WEST
 CENTRAL IOWA HAS BEEN CANCELLED. ADDITIONAL LIGHT SHOWERS OR
 THUNDERSTORMS ARE POSSBILE ACROSS THE AREA…HOWEVER THE THREAT OF
 HEAVY RAINFALL LEADING TO FLASH FLOODING HAS ENDED.

IOWA COUNTIES: SHELBY-POTTAWATTAMIE-MILLS-MONTGOMERY-FREMONT-PAGE- 

1:02- PM CDT THU MAY 30 2013
 
 …FLASH FLOOD WATCH IS CANCELLED…
 
 THE FLASH FLOOD WATCH FOR PORTIONS OF SOUTHWEST IOWA AND
 SOUTHEAST NEBRASKA HAS BEEN CANCELLED. HEAVY RAIN IS NO LONGER
 EXPECTED ACROSS SOUTHWEST IOWA AND MUCH OF SOUTHEAST NEBRASKA
 THIS AFTERNOON.

WIDESPREAD THUNDERSTORMS ARE POSSIBLE THIS AFTERNOON INTO EARLY
 EVENING. IN ADDITION TO HEAVY RAINFALL…LARGE HAIL…DAMAGING
 WINDS AND ISOLATED TORNADOES ARE POSSIBLE. THE TORNADO THREAT WILL
 BE MAINLY OVER SOUTHEASTERN IOWA ALONG AND SOUTH OF INTERSTATE
 80 AND EAST OF INTERSTATE 35.
 
 A FLASH FLOOD WATCH IS IN EFFECT FOR THE AREA THROUGH TODAY

SHELBY-POTTAWATTAMIE-MILLS-MONTGOMERY-FREMONT-PAGE-CASS-OTOE-GAGE-
 JOHNSON-NEMAHA-PAWNEE-RICHARDSON-
 1154 AM CDT THU MAY 30 2013
 
 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHWEST IOWA
 AND SOUTHEAST NEBRASKA.
 
 .DAY ONE…THIS AFTERNOON AND TONIGHT
 
  A FLASH FLOOD WATCH CONTINUES INTO THIS EVENING FOR SOUTHEAST
 NEBRASKA AND SOUTHWEST IOWA.
 
 WITH INCREASING SUNSHINE THIS AFTERNOON…INSTABILITY WILL
 CONTINUE TO INCREASE ACROSS THE AREA. A PIECE OF UPPER LEVEL
 ENERGY WILL MOVE NORTHEAST ACROSS THE AREA LATER THIS AFTERNOON
 AND PROVIDE THE DYNAMICS NEEDED TO PRODUCE THUNDERSTORMS…A FEW
 OF WHICH COULD BE SEVERE.

 …FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 7 PM CDT THIS EVENING…

SHOWERS AND THUNDERSTORMS WITH ADDITIONAL RAIN FALLING ON ALREADY SATURATED GROUND WILL RESULT IN POTENTIAL FLASH FLOODING.  

* SEVERAL RIVERS AND STREAMS ACROSS SOUTHEAST NEBRASKA AND SOUTHWEST IOWA ARE ALREADY ABOVE OR NEAR FLOOD STAGE AND ANY ADDITIONAL RAINFALL WILL COMPOUND FLOODING PROBLEMS. 
 
PRECAUTIONARY/PREPAREDNESS ACTIONS…
 
A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION. YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION SHOULD FLASH FLOOD WARNINGS BE ISSUED.

FLOOD STATEMENT
 NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
 1101 AM CDT THU MAY 30 2013
 
 …THE FLOOD WARNING IS CANCELLED FOR THE FOLLOWING RIVER…
 
   WEST NISHNABOTNA RIVER AT RANDOLPH AFFECTING FREMONT COUNTY.
 
   EAST NISHNABOTNA RIVER AT RED OAK AFFECTING MONTGOMERY COUNTY.

An upper level low pressure system will push a fairly strong disturbance across Iowa today. This will lead to periods of strong to severe storms across the state…especially during the afternoon and evening hours. Some storms will also produce heavy rain which may lead to additional flooding. Monitor forecasts for the latest updates on this storm system. (NWS/Des Moines)