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

Start Year of Plot:

Select Outlook Type:

Select Outlook Threshold:

Select Day:

View by WFO, State or Zone?

Select WFO:

Select FEMA Region:

Select State:

Select County/Zone:

Select Spatial Overlap Threshold:
Warning: overlap percentage adds 10s of seconds to plot generation

Image Pixel Size @100 DPI

Image Resolution (DPI) (50 to 500)

Select Output Format:

Plot Description:

This chart displays the period each year between the first and last SPC/WPC outlook type for a given NWS forecast office, state or county. The dates presented are the commonly considered date of outlook being valid for. Technically, the outlooks end at 12 UTC of the following day.

If you select the "View by Contiguous US" option, there is no spatial overlay check possible at this time.

An option exists to threshold the amount of spatial overlap between the outlook geometry and the NWS forecast office or state. This is useful for the situation of avoiding sliver touches or overlaps that aren't of perhaps significance. There is an "engulfs" option, that requires a 99% overlap. A 100% overlap is difficult for certain situations and this may generally be difficult for offices that have marine zones.

Autoplot 200 is similar, but generates spatial heatmaps.

3 Generated Chart

Based on recent timings, plot generation averages 4 seconds. Please wait while your chart is being generated...

CSV Data Excel Download

If you notice plotting issues with the image above, please contact us and provide the URL address currently shown by your web browser.

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.

16 Apr 2024: Hatched Tornado Risk
08 Feb 2024: Marginal Risk