The National Weather Service in Des Moines has released its Fall newsletter, containing a variety of weather data and information, including a forecast for cooler than normal temperatures for much of November and December, and  drier than normal conditions for southern and southwest Iowa. There’s also some interesting information about this Summer’s “Heat Burst” events in southwest Iowa. You can read all about it in “The Weather Whisper,” at http://www.crh.noaa.gov/images/dmx/DMXNewsletter/2011NewsletterWinter.pdf

DES MOINES, Iowa (AP) – Authorities say snow totals ranging from 2 to 6 inches have been reported in central Iowa. A National Weather Service winter weather advisory says up to 7 inches is expected in some areas before the storms leave the area by midmorning Wednesday. Service meteorologist Darren Snively says that roads will be slick, so people will have to remember how to drive safely in winter conditions. No weather-related road closures have been reported, although several highways in the north-south middle third of the state were covered with snow or a slushy mixture, and some power outages were reported.

The National Weather Service has dropped portions of the KJAN listening area out of the Winter Weather Advisory it issued Tuesday. The Advisory remains in effect until 9-a.m., otherwise removed, for: Adair, Adams, Guthrie, Dallas, Madison, Union, Taylor and Ringgold Counties.

* TIMING…SNOW IS EXPECTED THROUGH THE MORNING HOURS…MIXED AT TIMES WITH RAIN. EXPECT THE HIGHEST SNOWFALL RATES AND ACCUMULATION FROM THROUGH 6 AM CST…BEFORE TAPERING OFF BY MID MORNING WEDNESDAY MORNING.

* STORM TOTAL SNOW ACCUMULATIONS…A BAND OF 3 TO 5 INCHES OF HEAVY WET SNOW IS EXPECTED…WITH LOCALLY HIGHER AMOUNTS POSSIBLE IN SOME LOCATIONS…UP TO 6 INCHES. THE HEAVIEST SNOW IS EXPECTED FROM NEAR CRESTON TO NEAR DES MOINES TO NEAR  MARSHALLTOWN IN THE EAST.

* WINDS/VISIBILITY…STRONG NORTH TO NORTHEAST WINDS OF 15 TO 25  MPH WITH HIGHER GUSTS OVER 30 MPH MAY LEAD TO VISIBILITY RESTRICTIONS AT TIMES…MAINLY WHILE SNOW IS FALLING  OVERNIGHT.

* IMPACTS…ROADS WILL BECOME SNOW COVERED AND SLICK IN SPOTS AND WILL LEAD TO HAZARDOUS DRIVING CONDITIONS. PARTICULAR CAUTION SHOULD BE EXERCISED WITH THIS BEING THE FIRST SNOW OF THE SEASON. THE MORNING COMMUTE MAY BE IMPACTED BY THE  SNOWFALL.

Let it Snow…….on November 2nd!?!

Humidifiers have been running almost non-stop for weeks as one of Iowa’s driest Octobers in more than 20 years is now over. State climatologist Harry Hillaker says the month that just ended saw very little rainfall, though it wasn’t a record-breaker. “The driest one is in a class all by itself, way back in October of 1952,” Hillaker says. “Most of the state had no rain what-so-ever and the statewide average was just 2/100ths of an inch for the month. That’s our driest calendar month of any month for the year, not just for October.”

Here in Atlantic, we received just .21” of rain during the month. The normal average is 2.54-inches. While official State numbers are still being tabulated, this October saw a statewide average between three-quarters of an inch and eight-tenths of an inch of rain, which will rank it around the 10th driest Iowa October on record. It was the driest October since 1988 when we only averaged two-thirds of an inch of rain statewide. Hillaker say the just-ended month was also warmer than usual.

“The month is going to average out about three-degrees warmer than normal,” he says. “We actually got off to a rather cold start. We had an unusually cold September and the first couple of days in October were well below normal as well. A little bit of cold weather was mixed in, especially the last week or two, but most days were above normal.” As for the month ahead, November may follow suit, at least as far as warmth.

“November, historically when we’re in a La Nina weather pattern as we are right now, has quite strong odds of being warmer than normal and just a teeny tendency to be on the dry side of normal as well,” Hillaker says. Based on the forecast though, he says Iowa may see rain showers as soon as tomorrow (Wednesday) with an even-larger storm front possibly moving over the state this weekend.

The average high for October in Atlantic, was 68.5-degrees, which was slightly warmer than the normal average of 65.7. The average low was 35.9, which was slightly cooler than the normal average of 38.1.

Dry and windy conditions and little chance of precipitation have prompted officials in Cass County to issue a Burn Ban, which will remain in effect until further notice. The ban was instituted at 3-p.m. today (Friday, Oct. 7th), by Cass County Emergency Management Coordinator Mike Kennon, after he submitted a request which was approved by the State Fire Marshal’s Office. The ban means opening burning is prohibited until the Fire Marshal deems conditions in the county are such that open burning no longer constitutes a danger to life or property.

Burn bans are already in place in several northwestern and Central Iowa Counties. Cass County is the first in southwest and western Iowa to institute the ban. Just before the ban went into effect, a field fire was reported northwest of Atlantic this (Friday) afternoon. No buildings were in danger from the flames. Crews from Atlantic, Marne and Elk Horn were working the scene just before 3-p.m.

Average High temp for the month: 73.6 degrees.  Average Low: 43.8.  Rainfall: 1.08 inches.  Date with the most precipitation recorded at the KJAN studios: Sept. 18th, @ .37″. Warmest day: Sept. 1st, 91-degrees.  The lowest temperature was 29, set on Sept. 30th.

The average High for the month was 84.5-degrees. The hottest day was on the 23rd, when we topped out at 97, during a “heat burst” late in the evening. The average Low was 59.9-degrees. The coolest reading was 50-degrees, on the 24th. Normals for Atlantic: High – 84.2; Low – 59.7.

Rainfall for the month amounted to 6.9-inches. The greatest amount of rainfall occurred on thr 15th (3″).  Normal average rainfall in August, is 3.88″.

If you noticed it became unusually, and suddenly hot Tuesday evening here in Atlantic, and in the surrounding area, you weren’t imagining things. The National Weather Service in Des Moines says a rare phenomenon known as a “Heat Burst” affected portions of southwest Iowa. A Heat Burst is characterized by a sudden rise in temperature, a drop in humidity, and strong winds that can approach or exceed severe levels. They are associated with high-based decaying thunderstorms with a substantial dry layer between the base of the storm.

As rain from the thunderstorm falls into the underlying dry air, it cools the air immediately around it, which becomes denser than the surrounding air, and begins to sink. As this air sinks, it dries and compresses, resulting in the hot and dry readings recorded with heat bursts.

Here in Atlantic, at the KJAN studios…the official National Weather Service reporting station…our temperatures from 1-to 6-pm were generally in the mid-80’s. The high here at the station reached 97-degrees.

According to the Automated Weather Observation System located at the airport, just before 7-p.m., the winds began to increase from 15- to 30-miles per hour. By 7:15, were gusting upwards of 40-miles per hour, and the temperature jumped from 88-degrees at 6:55-p.m., to 99-degrees at 7:15. The temp maxed out at 102-degrees, 10-minutes later, and by 7:35 had dropped to 91. The air cooled to the mid 80’s by 8-p.m.

The phenomenon also brought some damaging winds to part of the listening area. Officials with the Weather Service say a Heat Burst-related wind event caused a tree to fall on a power line in Bridgewater, at around 6:50-p.m. At 7:05, a tree was observed down on a power line one-mile south of Brayton. Other tree limbs also fell, as winds of up to 40-miles per hour occurred. The temperature in that area also spiked, from 76- to 96-degrees in just a few minutes. There was also a sharp drop in the humidity. And, a 60-mile per hour gust of wind was recorded in Fontanelle at 7:44-p.m., by an automated system.

COUNCIL BLUFFS, Iowa (AP) – Heavy rain has flooded some streets and basements in far western Iowa and eastern Nebraska. Standing water blocked streets early Monday morning in Council Bluffs and across the Missouri River in Omaha, Neb. Council Bluffs officials asked residents in the Playland Park neighborhood on the west side of the city to remain in their homes until the rain runoff had dropped to safe levels. No evacuations were ordered. The American Red Cross says it was opening a shelter at Community of Christ Church on the east side of the city so people have a place to stay.

In Omaha, some streets just north of downtown were closed, and golfball-sized hail was observed.  Two- to three-inch diameter hail which fell at around 3:45-a.m. ,broke out several automobile windows in the Bellevue, NE.,   No injuries or deaths have been reported.

The National Weather Service in Valley, NE, reports 2.79-inches of rain had fallen near Glenwood, with three separate waves of hail ranging from pea to quarter-sized having fallen, as well. In Carter Lake, 3.31-inches of rain had fallen by 5-a.m., and anywhere from two-to three-inches of rain had fallen in the Omaha/Council Bluffs metro area.