Subscribe: Iowa Environmental Mesonet Daily Feature
http://mesonet.agron.iastate.edu/feature_rss.php
Added By: Feedage Forager Feedage Grade A rated
Language: English
Tags:
chart iem  chart  cold  featured  generate chart  iem website  iem  iowa  snow  storm  temperatures  winter storm  winter  year 
Rate this Feed
Rate this feedRate this feedRate this feedRate this feedRate this feed
Rate this feed 1 starRate this feed 2 starRate this feed 3 starRate this feed 4 starRate this feed 5 star

Comments (0)

Feed Details and Statistics Feed Statistics
Preview: Iowa Environmental Mesonet Daily Feature

Iowa Environmental Mesonet Daily Feature



Iowa Environmental Mesonet Daily Feature



Last Build Date: Thu, 18 Jan 2018 08:04:52 -0600

 



Fairbanks Recently Warmer
(image)

The featured chart compares daily high and low temperatures between Des Moines, IA and Fairbanks, Alaska since 1 December 2017. The past four days have seen warmer temperatures there than here. During this time of year, such a difference isn't all that rare, but the perception that Alaska should always be colder than we are! Due to large scale atmospheric flow patterns, having very cold weather in Iowa is often juxtaposed with very warm weather in Alaska. Our weather is in the process of warming up and any thoughts of moving to Alaska for warmer temperatures will diminish!

Generate This Chart on IEM Website




Dips Below Zero
(image)

The past three weeks have seen plenty of bouts with below zero weather. The featured time series is of hourly temperatures from the Ames Airport since late last year. The blue stripe represent the climatology range between the daily high and low temperature. The chart shows seven events during this period with the temperature below zero. The good news for those that don't like this very cold weather is that warmer temperatures are in the immediate near term forecast with highs even well above freezing later this week!

Generate This Chart on IEM Website




Sun Dogs
(image)

If you were outside yesterday afternoon braving the cold conditions, you likely noticed a very bright "Sun Dogs" display. These are the two bright spots horizontally on either side of the sun and are caused by light refraction through vertically oriented / falling ice crystals. These are common during cold and blowing snow situations. The featured image is from the KCRG-TV webcam in Iowa City Monday afternoon showing the right-hand (to our perspective) sun dog.

Generate This Chart on IEM Website




'17-'18 Winter Storm #7
(image)

Our continuing series of fluffy and light producing snow storms continued Sunday evening with most of the state picking up an inch or more. Amounts approaching six inches were reported over far Northeastern Iowa. Strong winds after the snow produced blowing snow and near whiteout conditions over northern Iowa. We are again left with very cold temperatures and dangerous wind chills after the passing snow storm. The official snowfall report for Des Moines was again below three inches, continuing the record stretch for the site to nearly 750 days.




'17-'18 Winter Storm #6
(image)

Our brief respite from cold winter weather ended on Thursday as a winter storm brought rain, freezing rain, sleet and snow to the state. The amount of snow produced was under what was anticipated, but the cold temperatures and dangerous wind chills did materialize for today. The featured map presents a smooth analysis of reports received. There were fewer than normal amount of reports made for this event as generally low totals and cold temperatures likely were discouraging for snowfall reports to be made. More snow and cold is in the forecast as winter rolls on for Iowa.




Flash Freeze
(image)

The term "Flash Freeze" appears to be relevant today as precipitation is falling over top a very strong arctic front. The featured map shows the combination of near surface air temperatures, road surface temperatures, and RADAR. The strong front can be seen with temperatures in the 40s quickly dropping into the 20s along with precipitation happening on both sides of this boundary. This creates a very dangerous situation as wet roads are quickly exposed to temperatures well below freezing. After the freeze, snow will fall and strong winds are expected to create near blizzard conditions. Going to be a tough travel day today.




Winter Storm Warning Counts
(image)

The featured map displays the number of winter storm warning events issued by NWS Offices since 1 October 2017. Please note that these events are not necessarily equal to the number of storms. Anyway, of interest is that places like Honolulu, Hawaii and Jacksonville, Florida have issued more winter storm warnings than local offices here in Iowa except Davenport. Iowa's total of Winter Storm Warnings will increase with the impending storm arriving tonight and into Thursday.

Generate This Chart on IEM Website




Doing Well for January Highs
(image)

High temperatures on Monday were an awesome relief from the bitter cold to start off the new year. Highs were well above freezing and even into the 40s for parts of Iowa. This is doing very well for January as average highs for the month are generally below freezing for the state as shown by the featured map depicting an analysis of NCEI climatology for the month. We'll have two more very nice days before winter returns in full force on Wednesday into Thursday.

Generate This Chart on IEM Website




Coldest Eight Days for Lows
(image)

Temperatures on Sunday were downright balmy with high temperatures above freezing and lows above zero! For places like Ames, this was the first day with a low above zero since 29 December making for eight straight days. The featured chart looks at the coldest stretch of eight days based on average low over that period. The horizontal bars denote the period of days and the color denotes the value for that period. The bottom panel displays a frequency for the individual day of the year participating in this period. So having this happen during early January isn't that exceptional, but one wonders if a colder period of eight days could still happen later this winter season? The frequencies would indicate that chances are still good for that to happen.

Generate This Chart on IEM Website




Rare Recent Record Low
(image)

Des Moines started off the new year by establishing a new daily record minimum low temperature of -19 degrees. This broke the previous record of -18 set way back in 1887! The featured chart looks at the year that the present day daily record is either set or currently tied. The four sections present the year of the daily record and a simple decade frequency. For the current decade, setting record cold lows and cold highs have been rare. This decade has the lowest totals for both values. There are a number of interesting features of the chart including how the 1930s stand out for record warm highs and lows.

Generate This Chart on IEM Website




Almost 72 Hours Straight below 0
(image)

Seasonally mild temperatures have been a struggle recently with numerous hours having below zero Fahrenheit values. In fact, many locations in the state recently completed a significant stretch of consecutive hours below zero. The featured chart shows the streak for the Des Moines Airport, whose streak of 2 days and 18 hours finished in the top ten longest since 1936 based on unofficial hourly archives maintained by the IEM.

Generate This Chart on IEM Website




About the Decreasing Range
(image)

This week's features have been looking at the yearly range between the warmest high and coldest low. Yesterday's feature showed a downward trend in range, meaning the difference between the warmest high and coldest low was decreasing. Today's featured chart looks more closely at this decrease. The top panel shows the yearly max temperature, the middle panel shows the yearly min, and the bottom panel shows the yearly difference between these two. An overall average is overlain for each series and a trailing 30 year average is presented as well. The trailing 30 year average shows the warmest highs decreasing and coldest lows increasing (both on average), so that would explain the decreasing range.

Generate This Chart on IEM Website




Decreasing Range
(image)

Yesterday's featured map displayed the range between the coldest low and warmest high temperature for 2017 over the CONUS. Today's featured chart shows the long term trend of this temperature range by year for Des Moines. Besides the yearly bars representing the temperature ranges, the chart also has long term and recent averages and the trailing 30 year average (yellow highlighted line). That trailing average is rather interesting as it shows a downward trend in range over the past 30 years or so. 2017 bucked this trend somewhat coming in well above the three averages shown.

Generate This Chart on IEM Website




2017 Temperature Range
(image)

The featured map displays the difference between the warmest and coldest temperature based on hourly high-resolution analysis produced by the Real-Time Mesoscale Analysis (RTMA). The coldest air of the entire year arrived last evening and helped to make this map even more extreme. Most of Iowa is shown in the 110 to 120 degree range. Even more extreme values are found just to our north and west with a few pixels over 140 degrees! There are many interesting features on the map with the moderating effects of the Great Lakes clearly evident and the decreased variability in temperature as you get further away from land.




'17-'18 Winter Storm #5
(image)

The snow producing storm systems have been coming quickly recently. The most recent system dumped an inch or two of fluffy snow over the state with the highest totals confined to west-central Iowa. As with some of the previous snowfalls, the usage of the term "winter storm" is probably generous for how "strong" the snow producing system is. Putting that aside, the snow dumped by these systems do have to be dealt with and do create travel headaches.




'17-'18 Winter Storm #4
(image)

The heaviest snow storm of the season dumped four to eight inches over a stripe of Iowa yesterday. Totals rapidly dropped off to the south of this stripe. Some freezing drizzle was also observed with this storm. Extremely cold air has now invaded the state and will stick around into the new year.




'17-'18 Winter Storm #3
(image)

Our latest snowfall producing storm brought just an inch or two to much of the state. The event came in two waves on Wednesday and Thursday. Given the holiday season, light totals and accumulation over two reporting days, reports were a bit sparse for this map. Regardless the highest totals stretched from Sioux City to southeast to Keokuk. More snow is on the way for today with more significant totals expected.




6th Most Common
(image)

The NWS has the entire state under a Wind Chill Advisory this morning. As measured by the number of unique events by a forecast county/zone, this advisory is the sixth most commonly issued alert by the NWS Des Moines. The featured table presents the relative frequency of an alert as issued by NWS Des Moines against the most common alert, the Severe Thunderstorm Warning. The relative percent indicates in bulk that a severe thunderstorm event is twice as common as a wind chill advisory. The Wind Chill Warning has colder thresholds for alerting than the advisory and appropriately appears at much lower frequencies for the chart.

Generate This Chart on IEM Website




Accum Wind Chill Time
(image)

The coldest air of the season is currently impacting the state with some bitterly cold wind chills prompting the issuance of Wind Chill Advisories. The featured chart looks at the accumulated amount of time that Des Moines has a wind chill temperature at or below the given temperature. This plot only considers cases when the wind was blowing strong enough to be measured. The totals this far for 2017 are well below average, but of course, we are just getting started for the season! Some even colder air is expected later this week.

Generate This Chart on IEM Website




'17-'18 Winter Storm #2
(image)

A light and fluffy snowfall arrived just in time to make for a white Christmas for much of southern Iowa. The featured map displays an IEM analysis of available snowfall reports from the NWS. Two to four inches were common over far southern Iowa with values generally an inch or less over northern Iowa. Very cold air has now settled into the state making for a very Christmas Day. The very cold air looks to stick around until the end of this year.