155 PM CDT THU JUN 11 2015 TORNADO WATCH 285 IS IN EFFECT UNTIL 900 PM CDT FOR THE FOLLOWING LOCATIONS IAC001-003-029-039-053-071-121-129-137-145-159-173-175-120200- /O.NEW.KWNS.TO.A.0285.150611T1855Z-150612T0200Z/ IA . IOWA COUNTIES INCLUDED ARE ADAIR ADAMS CASS CLARKE DECATUR FREMONT MADISON MILLS MONTGOMERY PAGE RINGGOLD TAYLOR UNION
* PRIMARY THREATS INCLUDE…
A FEW TORNADOES POSSIBLE; SCATTERED LARGE HAIL AND ISOLATED VERY LARGE HAIL EVENTS TO 2 INCHES IN DIAMETER POSSIBLE; SCATTERED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE
SUMMARY…SUPERCELL THUNDERSTORMS ARE EXPECTED TO FORM OVER SOUTHEAST NEB AND TRACK EASTWARD ACROSS THE WATCH AREA THIS AFTERNOON. LARGE HAIL AND DAMAGING WINDS ARE THE MAIN THREATS. HOWEVER…AN ISOLATED STORM OR TWO COULD PRODUCE TORNADOES. THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 65 STATUTE MILES EAST AND WEST OF A LINE FROM 70 MILES NORTHEAST OF SHENANDOAH IOWA TO 25 MILES WEST SOUTHWEST OF FALLS CITY NEBRASKA.
REMEMBER…A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE WARNINGS.
DALLAS-CASS-ADAIR-MADISON-ADAMS-UNION-TAYLOR-RINGGOLD COUNTIES…A FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH LATE TONIGHT.
* WIDESPREAD THUNDERSTORMS WILL BE CAPABLE OF PRODUCING HEAVY RAIN TODAY INTO TONIGHT…WITH TOTAL RAINFALL AMOUNTS RANGING FROM 2 TO 4 INCHES AND LOCALLY HIGHER AMOUNTS CERTAINLY POSSIBLE.
* RAINFALL RATES AS HIGH AS TWO INCHES PER HOUR AT TIMES MAY LEAD
TO FLASH FLOODING AND RISES IN AREA RIVERS. PORTIONS OF THE DES
MOINES AND RACCOON RIVER BASINS AND TRIBUTARIES MAY BE IMPACTED
LATER IN THE WEEK.
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.
1156 AM CDT THU JUN 11 2015
FLASH FLOOD WATCH IN EFFECT UNTIL 9 PM CDT THIS EVENING.
HEAVY RAINFALL PRODUCED BY THUNDERSTORMS THIS AFTERNOON INTO
EARLY EVENING WILL BRING THE RISK OF FLASH FLOODING…ESPECIALLY
IF STORMS TRACK OVER AREAS THAT RECEIVED HEAVY RAINFALL
OVERNIGHT INTO THIS MORNING.
AREA STREAMS…CREEKS…AND RIVERS MAY REACH OR EXCEED BANKFULL.
FLOODING MAY OCCUR IN LOW WATER SPOTS PRONE TO
FLOODING…CREATING POTENTIALLY DANGEROUS DRIVING CONDITIONS.
1213 PM CDT THU JUN 11 2015
The National Weather Service in Omaha has issued a flood warning for the Nodaway River At Clarinda, affecting Page County. The warning is in effect from this evening to Friday evening…or until the warning is cancelled.
* At 11:00 AM Thursday the stage was 16.3 feet…or 6.7 feet below
* Flood stage is 23.0 feet.
* Minor flooding is forecast.
* Forecast…rise above flood stage by this evening and continue to
rise to near 23.5 feet by after midnight tomorrow the river will
fall below flood stage by early tomorrow.
* Impact…at 24.0 feet…Additional lowlands, some farmlands, and
county roads flood.
1124 AM CDT THU JUN 11 2015
…FLASH FLOOD WATCH IS CANCELLED…
THE FLASH FLOOD WATCH FOR A PORTION OF SOUTHWEST IOWA HAS BEEN
CANCELLED. A NEW FLASH FLOOD WATCH WILL BE ISSUED FOR THIS
AFTERNOON…DUE TO THE THREAT OF HEAVY RAINFALL WITH THUNDERSTORMS THAT ARE EXPECTED TO DEVELOP LATER.
1013 AM CDT THU JUN 11 2015
MONONA-HARRISON-SHELBY-POTTAWATTAMIE COUNTIES…FLASH FLOOD WATCH IS CANCELLED.
HEAVY RAIN LINGERING IN SOUTHWEST IOWA BUT EXITING ELSEWHERE. PROLONGED PERIODS OF HEAVY RAINFALL ASSOCIATED WITH THUNDERSTORMS MOVING ACROSS SOUTHWESTERN IOWA MAY LEAD TO FLASH FLOODING THROUGH MIDDAY. ELSEWHERE…THE THREAT OF HEAVY RAINFALL HAS DIMINISHED THROUGH MIDDAY.
A FLASH FLOOD WATCH REMAINS IN EFFECT UNTIL 1-P.M. TODAY FOR MONTGOMERY, FREMONT AND PAGE COUNTIES, AND UNTIL LATE TONIGHT FOR CASS, ADAIR, ADAMS, AUDUBON, GUTHRIE, MADISON, SAC, CRAWFORD, CARROLL, RINGGOLD, TAYLOR AND UNION COUNTIES in the KJAN listening area.
936 AM CDT THU JUN 11 2015
THE NATIONAL WEATHER SERVICE IN OMAHA HAS ISSUED AN URBAN AND SMALL STREAM FLOOD ADVISORY FOR…PAGE COUNTY and FREMONT COUNTY IN SOUTHWESTERN IOWA UNTIL 1230 PM CDT
* AT 934 AM CDT…DOPPLER RADAR INDICATED HEAVY RAIN DUE TO
THUNDERSTORMS MOVING THROUGH THE AREA. THIS IS IN AN AREA THAT
RECEIVED VERY HEAVY RAINFALL YESTERDAY EVENING. THIS MAY CAUSE
URBAN AND SMALL STREAM FLOODING IN THE ADVISORY AREA.
* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE…
BLANCHARD…HEPBURN AND PIERCE RECREATION AREA.
EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE PONDING OF WATER IN URBAN AREAS…HIGHWAYS…STREETS AND UNDERPASSES AS WELL AS OTHER POOR DRAINAGE AREAS AND LOW LYING SPOTS. DO NOT ATTEMPT TO TRAVEL ACROSS FLOODED ROADS. FIND ALTERNATE ROUTES.
EXCESSIVE RUNOFF FROM HEAVY RAINFALL MAY CAUSE FLOODING OF SMALL CREEKS AND STREAMS…AS WELL AS FARM AND COUNTRY ROADS. DO NOT ATTEMPT TO TRAVEL ACROSS FLOODED ROADS. FIND ALTERNATE ROUTES.
The National Weather Service in Valley, NE., has issued a FLOOD WARNING for the West Nishnabotna River at Hancock, affecting Pottawattamie County, and the West Nish at Randolph, affecting Fremont County. A FLOOD WARNING is also in effect for the East Nishnabotna River, at Red Oak.
For the East Nishnabotna River At Red Oak: the warning is in effect from this evening to late Saturday night…or until the warning is cancelled.
* At 9:00 AM Thursday the stage was 8.7 feet…or 9.3 feet below flood stage.* Flood stage is 18.0 feet.* Moderate flooding is forecast.
* Forecast…rise above flood stage by tonight and continue to rise to near 23.2 feet by tomorrow evening the river will fall below flood stage by late Saturday morning.
* Impact…at 23.0 feet…Flooding begins east of the intersection of Highway 34 and G Avenue.
Flood Warning for The West Nishnabotna River At Hancock from this evening to Friday evening…or until the warning is cancelled.
* At 9:00 AM Thursday the stage was 4.2 feet…or 9.8 feet below flood stage.
* Flood stage is 14.0 feet.* Minor flooding is forecast.
* Forecast…rise above flood stage by tonight and continue to rise
to near 15.7 feet by after midnight tomorrow the river will fall
below flood stage by early tomorrow.
* Impact…at 16.0 feet…The approach to the gage floods from the left bank.
For the West Nishnabotna River At Randolph: from late tonight to Saturday afternoon…or until the warning is cancelled.
* At 9:00 AM Thursday the stage was 10.4 feet…or 8.6 feet below flood stage.
* Flood stage is 19.0 feet.* Minor flooding is forecast.
* Forecast…rise above flood stage by early tomorrow and continue to rise to near 20.6 feet by early tomorrow afternoon the river will fall below flood stage by late tomorrow evening.
* Impact…at 22.0 feet…County Road L-68 located 5 miles south of Randolph begins to flood.
…FLASH FLOOD WATCH NOW IN EFFECT UNTIL 1 PM CDT THIS AFTERNOON…