Motorists traveling in Iowa should be aware that the mercury might not be the only thing to rise during the sweltering summer heat. Pavement blowups occur when thermal expansion forces the pavement to buckle and shatter. A number of such incidents have been occurring this week.
In a typical year, Iowa DOT maintenance equipment operators spend 2,000 to 4,000 hours making temporary repairs of pavement blowups and another 6,000 hours replacing these pavement sections, costing an average of $400,000 annually. Many of the blowups only result in a small pothole or small chunks of concrete lying around the pavement joints, but they must still be repaired.
Unlike scheduled maintenance, pavement blowups occur spontaneously and motorists receive no advance warning. Once a blowup is reported, it takes time to erect a work zone and notify the public. The Iowa DOT urges motorists to pay special attention to pavement surfaces when driving during afternoons with 90-degree or hotter temperatures. Use caution and reduce your speed when approaching broken pavement areas.
Motorists who witness a pavement blowup are asked to contact the nearest law enforcement agency to ensure traffic is routed around the blowup until work zone signage and repair crews are on the scene.
The National Weather Service has issued a four-day-long “excessive heat advisory” for most of the state and parts of northern Iowa are under an “excessive heat warning.” The Advisory runs through 7-a.m. Saturday, for all but the far west and southwest counties, where a separate Heat Advisory is in effect from Noon today through 8-p.m. That includes Monona, Harrison, Shelby, Pottawattamie, Mills, Montgomery, Fremont and Page Counties. Heat indecies are expected to climb to around 105 degrees or higher this afternoon in those counties, and from 100-to 105 for the rest of the area.
Meterologist Kevin Skow works in the National Weather Service office in Johnston. He says “This is an unusual situation where we’ve had a very persistent high pressure system over us that’s pumping up a lot of heat from the south.” This prolonged period of super-high temperature readings during the day is happening because things cannot cool down overnight and Skow says it’s due to a “very moist” air mass hovering over the state. “It takes more energy for water vapor to cool off and since it’s so moist, the air just simply can’t cool off overnight as much as it could, say, in the springtime when we usually have drier air over us,” Skow says. Smoke from the Colorado wildfires has drifted over Iowa, but experts say it won’t cause health problems.
“The smoke is really high in the atmosphere,” he says. “It’s up at 20,000-30,000 feet and the only effects that Iowans will really see from it (are) generally some hazier skies and some redder sunrises and sunsets.” By eight o’clock this morning (Tuesday), heat index readings across the state indicated it already felt like it was 80 degrees in most locations. On Monday Nebraska’s governor declared a state of emergency in his state due to drought conditions there.
The (podcast) Freese-Notis forecast for Atlantic & the KJAN listening area, and weather data for Atlantic…
Counties: MONONA-HARRISON-SHELBY-POTTAWATTAMIE-MILLS-MONTGOMERY-FREMONT- PAGE-
326 AM CDT TUE JUL 3 2012 HEAT ADVISORY IN EFFECT FROM NOON TODAY TO 8 PM CDT THIS EVENING
THE NATIONAL WEATHER SERVICE IN OMAHA/VALLEY HAS ISSUED A HEAT ADVISORY, WHICH IS IN EFFECT FROM NOON TODAY TO 8 PM CDT THIS EVENING.
HEAT INDICES ARE EXPECTED TO CLIMB TO 105 DEGREES OR ABOVE THIS AFTERNOON. THE COMBINATION OF HEAT AND HUMIDITY WILL BRING AN INCREASED RISK OF HEAT EXHAUSTION OR HEAT STROKE TO THOSE WORKING OR PLAYING OUTDOORS AND FOR THE VERY YOUNG AND ELDERLY.
A HEAT ADVISORY MEANS THAT A PERIOD OF HOT TEMPERATURES IS EXPECTED. THE COMBINATION OF HOT TEMPERATURES AND HIGH HUMIDITY WILL COMBINE TO CREATE A SITUATION IN WHICH HEAT ILLNESSES ARE POSSIBLE. DRINK PLENTY OF FLUIDS…STAY IN AN AIR-CONDITIONED ROOM…STAY OUT OF THE SUN…AND CHECK UP ON RELATIVES AND NEIGHBORS.
321 AM CDT TUE JUL 3 2012
***HEAT ADVISORY IN EFFECT FROM 7 AM THIS MORNING TO 7 AM CDT SATURDAY FOR CASS, ADAIR, ADAMS, AUDUBON, CARROLL, CRAWFORD, GUTHRIE, MADISON, RINGGOLD, TAYLOR & UNION COUNTIES IN THE KJAN LISTENING AREA***
(See http://www.crh.noaa.gov/dmx/) (For Heat Safety tips & information: http://www.crh.noaa.gov/images/dmx/Preparedness/PDFs/HeatWebPDF.pdf)
TODAY…SUNNY…HOT. HIGH IN THE UPPER 90S. SOUTHWEST WIND 10 TO 15 MPH.
TONIGHT…MOSTLY CLEAR. LOW IN THE LOWER 70S. SOUTH WIND 5 TO 10 MPH.
INDEPENDENCE DAY…SUNNY…HOT. HIGH IN THE UPPER 90S. SOUTH WIND 5 TO 10 MPH. HIGHEST HEAT INDEX READINGS 100 TO 104 IN THE AFTERNOON.
WEDNESDAY NIGHT…MOSTLY CLEAR. LOW IN THE MID 70S. SOUTH WIND 5 TO 10 MPH. HIGHEST HEAT INDEX READINGS AROUND 100 THROUGH MIDNIGHT.
THURSDAY…MOSTLY SUNNY. HIGH IN THE UPPER 90S. SOUTH WIND 5 TO 10 MPH. HIGHEST HEAT INDEX READINGS 100 TO 104 IN THE AFTERNOON.
THURSDAY NIGHT THROUGH SATURDAY NIGHT…PARTLY CLOUDY. LOW IN THE MID 70S. HIGH IN THE UPPER 90S.
COUNTIES: EMMET-KOSSUTH-WINNEBAGO-WORTH-PALO ALTO-HANCOCK-CERRO GORDO- POCAHONTAS-HUMBOLDT-WRIGHT-FRANKLIN-BUTLER-BREMER-SAC-CALHOUN- WEBSTER-HAMILTON-HARDIN-GRUNDY-BLACK HAWK-CRAWFORD-CARROLL-GREENE- BOONE-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-
HEAT ADVISORY IN EFFECT FROM 7 AM TUESDAY TO 7 AM CDT SATURDAY... THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A HEAT ADVISORY…WHICH IS IN EFFECT FROM 7 AM TUESDAY TO 7 AM CDT SATURDAY. *
A PROLONGED PERIOD OF HOT AND HUMID CONDITIONS ARE EXPECTED ACROSS THE AREA TUESDAY THROUGH FRIDAY NIGHT. HEAT INDICES OF 100 TO 105 ARE EXPECTED EACH AFTERNOON…AS MAX TEMPERATURES CLIMB INTO THE MID TO UPPER 90S…COMBINED WITH DEWPOINTS IN THE UPPER 60S TO AROUND 70. HEAT INDICES WILL REMAIN AROUND 80 DEGREES OR HIGHER AT NIGHT.
DUE TO RECENT DRY CONDITIONS IN SOME AREAS ACROSS CENTRAL IOWA…THIS PROLONGED PERIOD OF HOT WEATHER COULD LEAD TO AN INCREASED CONCERN FOR SMALL GRASSLAND FIRES.
A HEAT ADVISORY MEANS THAT A PERIOD OF HOT TEMPERATURES IS EXPECTED. THE COMBINATION OF HOT TEMPERATURES AND HIGH HUMIDITY WILL COMBINE TO CREATE A SITUATION IN WHICH HEAT ILLNESSES ARE POSSIBLE. DRINK PLENTY OF FLUIDS…STAY IN AN AIR-CONDITIONED ROOM…STAY OUT OF THE SUN…AND CHECK UP ON RELATIVES AND NEIGHBORS. TAKE EXTRA PRECAUTIONS IF YOU WORK OR SPEND TIME OUTSIDE. KNOW THE SIGNS AND SYMPTOMS OF HEAT EXHAUSTION AND HEAT STROKE. ANYONE OVERCOME BY HEAT SHOULD BE MOVED TO A COOL AND SHADED LOCATION. HEAT STROKE IS AN EMERGENCY…CALL 9 1 1.
DES MOINES, Iowa (AP) — Smoke from wildfires raging in Colorado has drifted into Iowa, making for redder skies at dawn and dusk but causing no health problems. The Des Moines Register says the smoke will likely remain over the state until the fires are out. The National Weather Service says the smoke is high in the atmosphere, so residents likely won’t see too many effects. Meteorologist Kevin Skow says winds, which generally flow from west to east across the U.S., has pushed the smoke over Iowa. He says the sky is hazier, and sunrises and sunsets will be redder than normal. Meteorologists haven’t notices any dust or other particles that could settle on the state and aren’t aware of any health risks. Environmental officials say Iowa’s air quality is good.
Iowans shouldn’t expect any relief from the extreme heat this week. National Weather Service meteorologist Miles Schumacher says it’ll be hotter than usual for the first week of July. “It’s going to remain hot all week with mid 90s (for highs) and temperatures staying in the 70s throughout the night,” Schumacher said. A heat advisory covering northwest Iowa runs from noon today until 7 p.m. on Friday. An additional heat advisory is posted for northeast Iowa from noon until 10 p.m. today only.
“One thing we don’t have that a lot of times we have is the extremely high humidity,” Schumacher said. He credits the mostly dry conditions over the past few months for the lack of humidity. The best chance for rain and slightly cooler conditions won’t arrive until late next weekend. “It’s looking like…Sunday and Monday we’ll see some cooler air and temperatures getting back to normal in the middle 80s for highs. It’s looks like we do have a chance for some much needed rainfall by Sunday and Monday,” Schumacher said.
There’s an up side to all of the hot and steamy weather — far fewer tornadoes. Jeff Johnson, the warning coordination meteorologist for National Weather Service office in Johnston, says June is usually one of the worst months for twisters in Iowa. That wasn’t the case this year. “We really are below normal,” Johnson says. “We haven’t had any so far in the state. That’s unofficial. There could be one out there I’m not aware of but very few tornadoes in June which is our peak month, climatologically speaking. June is when we account for a large percentage of our tornadoes. May and June account for about 70% of our annual total.”
He says Iowa’s seen very few tornadoes in 2012, so far. “Our service area in Des Moines, which is 51 central Iowa counties, I think we’ve had a total of four tornadoes this year, which is really small,” he says. “We had the EF2 that hit Creston on April 14th and that’s been our most significant event but otherwise, very few tornadoes in Iowa this year.” During 2011, Iowa recorded 50 tornadoes which caused 16 injuries and no deaths. Over the past three decades, Iowa has averaged 47 twisters per year.
Yesterday’s High in Atlantic was 94. Our low for the 24-period ending at 7-a.m. today will be 70. Overnight, we were in the upper 70′s. Rainfall last month amounted to 3.95-inches, or about 2-tenths of an inch below normal. Normal rainfall for the month is 4.16″. The average High in June was 85.3-degrees, which was nearly 3-degrees warmer than normal . The Average Low last month was 61.1-degrees, which was also 3-degrees above normal.
Here’s the (podcast) Freese-Notis forecast for Atlantic, and the KJAN listening area…