The National Weather Service is changing how it measures the depths of Iowa’s waterways, which also means a change in how much water will be needed to prompt the issuing of flood warnings. Senior hydrologist Jeff Zogg says they’re shifting 44 of the 47 river forecast points across the state’s mid-section. “The reason we’re changing the flood stages and the flood categories across central Iowa is to give our flood warnings more meaning,” Zogg says. “We want to be sure that when we issue a river flood warning for a given location, that it actually means that something is going to occur.” The National Weather Service office in Johnston serves 51 counties in central Iowa. He says the changes will impact about 30 rivers and streams across that area.
“Over the years, due to mitigation activities, locations that may have been affected at a given stage are no longer impacted,” Zogg says. “That requires us to raise the flood stage and the flood categories.” Almost all of the changes in river forecasting markers are being moved upward, meaning, a warning won’t be issued now until floodwaters reach a higher point. “Many people have probably become used to us issuing river flood warnings for levels that don’t have much impact,” Zogg says. “Going forward, the flood warnings we do issue will definitely have more impact. They’re keyed in to impacts to life and property in the locations we do flood warnings for, so, they definitely need to pay attention to these flood warnings.” Zogg anticipates the changes will mean a 50-percent reduction in the number of flood warnings the office issues this next year, versus previous years. The National Weather Service is scheduled to release its annual flood forecast for Iowa next Thursday, February 16th. Learn more about the changes at www.weather.gov/dmx.
(Matt Kelley/Radio Iowa)
340 AM CST THU FEB 9 2012
TODAY…MOSTLY CLOUDY. HIGH IN THE LOWER 30S. SOUTHWEST WIND 5 TO 15 MPH.
TONIGHT…PARTLY CLOUDY. LOW 10 TO 15. WEST WIND 5 TO 10 MPH SHIFTING TO THE NORTHWEST 10 TO 15 MPH WITH GUSTS TO AROUND 25 MPH AFTER MIDNIGHT.
FRIDAY…MOSTLY SUNNY. COLDER. HIGH 15 TO 20. NORTH WIND 10 TO 15 MPH WITH GUSTS TO AROUND 25 MPH.
FRIDAY NIGHT…MOSTLY CLEAR. COLDER. LOW ZERO TO 5 BELOW. NORTH WIND 5 TO 10 MPH.
SATURDAY…SUNNY. HIGH AROUND 15. NORTHWEST WIND 5 TO 10 MPH.
SATURDAY NIGHT…MOSTLY CLEAR. LOW ZERO TO 5 BELOW.
SUNDAY…PARTLY SUNNY. HIGH IN THE LOWER 20S.
Here’s the Freese-Notis 4-day forecast for the KJAN listening area, & the weather stats for Atlantic…
335 AM CST WED FEB 8 2012
TODAY…MOSTLY SUNNY. HIGH IN THE MID 20S. WEST WIND NEAR 5 MPH.
TONIGHT…PARTLY CLOUDY. COLDER. LOW 5 TO 10 ABOVE. WEST WIND NEAR 5 MPH.
THURSDAY…MOSTLY SUNNY. HIGH IN THE LOWER 30S. SOUTHWEST WIND 5 TO 10 MPH.
THURSDAY NIGHT…PARTLY CLOUDY. LOW AROUND 10. NORTHWEST WIND 5 TO 15 MPH.
FRIDAY…MOSTLY SUNNY. COLDER. HIGH 15 TO 20. NORTH WIND 10 TO 15 MPH.
FRIDAY NIGHT…PARTLY CLOUDY. COLDER. LOW ZERO TO 5 BELOW.
SATURDAY AND SATURDAY NIGHT…MOSTLY CLEAR. HIGH AROUND 15. LOW NEAR ZERO.
SUNDAY…MOSTLY SUNNY. HIGH IN THE MID 20S.
552 PM CST TUE FEB 7 2012
…ROADS MAY BRIEFLY BECOME ICY THIS EVENING…
LIGHT PRECIPITATION WILL CONTINUE TO PUSH SOUTHEAST ACROSS THE REGION. PRECIPITATION WILL GENERALLY BE A MIX OF DRIZZLE AND LIGHT SNOW. WITH TEMPERATURES FALLING TO NEAR OR BELOW FREEZING THROUGHOUT THE EVENING…WET SURFACES MAY BECOME SLICK AT TIMES…INCLUDING SIDEWALKS AND ROADWAYS…ESPECIALLY ELEVATED SURFACES SUCH AS BRIDGES AND OVERPASSES. MOTORISTS SHOULD USE CAUTION WHILE DRIVING…WITH DETERIORATING DRIVING CONDITIONS AND SLICK ROADS.
Between 5:50- and 6:00pm, there were reports of 2 vehicle spinning off I-80 in Cass County. No injuries.
COUNTIES: STORY-MARSHALL-TAMA-AUDUBON-GUTHRIE-DALLAS-POLK-JASPER-POWESHIEK- CASS-ADAIR-MADISON-WARREN-MARION-MAHASKA-ADAMS-UNION-CLARKE-LUCAS-MONROE-WAPELLO-TAYLOR-RINGGOLD-DECATUR-WAYNE-APPANOOSE-DAVIS-
341 PM CST TUE FEB 7 2012
…ROADS MAY BRIEFLY BECOME ICY THIS EVENING…
AIR TEMPERATURES WERE HOVERING AROUND THE FREEZING MARK LATE THIS AFTERNOON…BUT ROAD SURFACE TEMPERATURES REMAINED ABOVE FREEZING FROM HIGHWAY 20 TO THE MISSOURI BORDER THANKS TO SEASONAL DAYTIME HEATING…CLOUDS AND MOISTURE. THESE CONDITIONS…WITH JUST WET ROADS AND MAINLY DRIZZLE…SHOULD PERSIST INTO THE EVENING COMMUTE. HOWEVER SHORTLY AFTER THAT TIME…FROM 600 PM UNTIL LATER THIS EVENING WHEN THE DRIZZLE AND FREEZING DRIZZLE END…SCATTERED SLICK SPOTS MAY DEVELOP. MOTORISTS PLANNING TRAVEL LATER THIS EVENING SHOULD BE PREPARED FOR THE POTENTIAL OF SEVERAL HOURS WITH DETERIORATING DRIVING CONDITIONS AND SLICK ROADS.
Here is the forecast for the KJAN listening area, and the weather stats for Atlantic…
356 AM CST TUE FEB 7 2012
TODAY…CLOUDY. PATCHY FOG THROUGH MID MORNING. PATCHY FREEZING DRIZZLE IN THE MORNING. SCATTERED FLURRIES THROUGH THE DAY. NO ICE ACCUMULATION. HIGH IN THE UPPER 20S. TEMPERATURE STEADY OR SLOWLY FALLING IN THE AFTERNOON. NORTHEAST WIND 10 TO 15 MPH WITH GUSTS TO AROUND 25 MPH.
TONIGHT…MOSTLY CLOUDY. LOW 5 TO 10 ABOVE. NORTH WIND 5 TO 10 MPH.
WEDNESDAY…MOSTLY SUNNY. HIGH IN THE LOWER 20S. NORTHWEST WIND 5 TO 10 MPH.
WEDNESDAY NIGHT…MOSTLY CLEAR. LOW ZERO TO 5 ABOVE. WEST WIND 5 TO 10 MPH.
THURSDAY…SUNNY. HIGH AROUND 30. SOUTHWEST WIND 5 TO 15 MPH.
THURSDAY NIGHT AND FRIDAY…PARTLY CLOUDY. LOW AROUND 10. HIGH IN THE LOWER 20S.
FRIDAY NIGHT…MOSTLY CLEAR. LOW 5 TO 10 ABOVE.
1005 AM CST MON FEB 6 2012
…DENSE FOG ADVISORY IN EFFECT UNTIL NOON CST TODAY for all of Southwest/Western IA……FREEZING FOG ADVISORY HAS EXPIRED…
THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A DENSE FOG
ADVISORY…WHICH IS IN EFFECT UNTIL NOON CST TODAY.
* VISIBILITY…VISIBILITIES WILL CONTINUE TO BE A QUARTER MILE OR
LESS IN MANY AREAS THIS MORNING. CONDITIONS SHOULD RAPIDLY
IMPROVE OVER NON SNOW COVERED AREAS OF NORTHERN IOWA NORTH OF
HIGHWAY 30 BY NOONTIME. HOWEVER FOG WITH VISIBILITIES OF LESS
THAN A MILE SHOULD PERSIST OVER THE SNOW PACK FARTHER SOUTH.
* IMPACTS…LOW VISIBILITIES WILL CREATE HAZARDOUS TRAVEL
CONDITIONS THIS MORNING.
A DENSE FOG ADVISORY MEANS VISIBILITIES WILL FREQUENTLY BE
REDUCED TO LESS THAN ONE QUARTER MILE. IF DRIVING…SLOW DOWN…
USE YOUR HEADLIGHTS…AND LEAVE PLENTY OF DISTANCE AHEAD OF YOU.