Automated Data Plotter

This application dynamically generates many types of graphs derived from various IEM data sources. Feel free to use these generated graphics in whatever way you wish.

Reset App IEM Explorer (Simplified)

1 Select a Chart Type

Choose from available chart types:

2 Configure Chart Options

Partition By:

Start plot on given date:

How to Spatially Group Statistics:

Select State (if appropriate):

Select WFO (if appropriate):

Select FEMA Region:

Select Watch/Warning Phenomena Type:

Select Watch/Warning Significance Level:

Image Pixel Size @100 DPI

Image Resolution (DPI) (50 to 500)

Select Output Format:

Plot Description:

This chart shows the time partitioned frequency of having at least one watch/warning/advisory (WWA) issued by the Weather Forecast Office (top plot) and the overall number of WWA issued events (bottom plot). This plot hopefully answers the question of which day/week/month of the year is most common to get a certain WWA type and which week has seen the most WWAs issued. The plot only considers issuance date. When plotting for a state, an event is defined on a per forecast office basis.

Updated 21 Nov 2023: An experimental attempt is now included on the plot to estimate the climatological favored period for the given event type. This algorithm is experimental and attempts to make life choices on if it thinks the climatology is bimodal or not. Feedback welcome!

3 Generated Chart

Based on recent timings, plot generation averages 2 seconds. Please wait while your chart is being generated...

CSV Data Excel Download

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IEM Daily Features using this plot

The IEM Daily Features found on this website often utilize plots found on this application. Here is a listing of features referencing this plot type.

06 Jun 2025: Nearing Season Peak
12 Oct 2023: Weekly SVR Warnings
04 Jan 2022: Wind Advisories by Week
06 May 2020: Severe TStorm Warning Season
25 Sep 2018: Severe Season Winding Down
20 Jan 2017: Dense Fog Advisory Counts
19 Jan 2015: Wind Advisories