Past IEM Features tagged: thunder

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Peak Thunder

28 Jun 2017 05:34 AM
The featured chart displays the average number of calendar days each month during which at least one automated thunder report was reported at the Des Moines Airport. Based on the averages, the month of June represents peak thunder for the year. So far, this year's total is a bit below average but a number of forecasted stormy days remain. Of course, there are caveats with a plot like this as automated reporting methods have changed over the years. So a value of eight days in June represents about one out of every four days.

Voting:
Good: 10
Bad: 0

Tags:   thunder  

Rare December Thunder

23 Dec 2016 06:15 AM
After the ongoing snow storm this Friday, a more powerful storm system arrives for Christmas Sunday. Warmer air is expected to flood the state ahead of the storm system and conditions may be favorable for thunderstorms! How far is having thunder in December? The featured chart presents the number of distinct calendar days each month that thunder was reported by the Des Moines Airport weather station. The red bars are the total for 2016 and the blue bars are long term averages. The 0.3 days presented on average for December would equate to having one event every 3 years.

Voting:
Good: 11
Bad: 0

Tags:   thunder  

Thunder by Hour

16 Jul 2015 05:44 AM
A complex of thunderstorms is currently rumbling over the state this Thursday morning. The Des Moines weather station has reported thunder for most of the overnight hours today. The featured chart presents the frequencies of thunder being reported by the Des Moines Airport weather station. The bottom and right side bar charts display a histogram of these reports by week of year and hour respectively. The early morning hours are the favored time for thunder reports as much of Iowa's summertime precipitation is driven by a phenomena called the 'Low Level Jet'. This jet feeds unstable air into Iowa during the overnight hours.

Voting:
Good: 18
Bad: 8
Abstain: 5

Tags:   thunder  

Thunderstorm and Winds

09 Sep 2014 05:05 AM
The Des Moines Airport automated weather station reported a thunderstorm yesterday afternoon along with southeasterly winds. The featured wind rose presents the wind speed and direction during which a thunderstorm is reported within the present weather observation of the site. Thunderstorms are driven by instability in the atmosphere, which is the combination of warm and moist air. Our primary source of that type of air is from the southeast, so it makes sense to see that wind direction dominate the frequency shown in the wind rose. While Iowa gets the warmest air from the southwesterly directions, that air is typically much drier and thus less likely to help promote thunderstorm development. More thunderstorms are expected today.

Voting:
Good: 18
Bad: 10
Abstain: 8

Tags:   asos   thunder