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

How to summarize the data?

Select WFO:

Select State:

Select UGC Zone/County:

Select FEMA Region:

Total by Selected Phenomena/Significance or Combo

Select Watch/Warning Phenomena Type:

Select Watch/Warning Significance Level:

Color Ramp:

Reverse Colormap?

Image Pixel Size @100 DPI

Image Resolution (DPI) (50 to 500)

Select Output Format:

Plot Description:

This chart displays the monthly number of distinct NWS Office issued watch / warning / advisory product. For example, a single watch for a dozen counties would only count 1 in this chart. These values are based on unofficial archives maintained by the IEM.

The chart summarizes by the month of issuance, so long fuse products like Flood Warnings that cover multiple months in time would only appear once for the month of issuance.

If you select the state wide or FEMA option, the totaling is a bit different. A single watch issued by multiple WFOs would potentially count as more than one event in this listing. Sorry, tough issue to get around. In the case of warnings and advisories, the totals should be good.

Autoplot 243 allows for more direct plotting of daily record totals. Autoplot 245 produces a similar plot to this one, but with Local Storm Report (LSR) totals. Autoplot 109 produces maps in a similiar manner to this plot.

3 Generated Chart

Based on recent timings, plot generation averages 3 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.

29 May 2025: 1 May Tornado Warning
15 Aug 2024: Severe Warnings for Omaha
29 Apr 2024: Record Warning Count
17 Jan 2023: Tornado Warnings in January
15 Dec 2022: Another wild December
23 Dec 2021: December Tornado Warnings
13 Oct 2021: Monthly Warning Counts
23 Apr 2021: Quiet April
14 Aug 2019: Monthly Dense Fog Advisories
27 Dec 2018: December SVR Warnings
22 Oct 2018: October Tornado Warnings
01 Mar 2017: February Tornado Warnings
29 Nov 2016: November Tornado Warnings Again