Severe Weather Tracker IAD (2024)

• Removed air quality tracking.

• Rebuilt tracker interface and added significant amounts of color.

• The date of every tracked event will now also be stored in the tracker, and if possible, the dates will link to additional information/archives. For example, if a MRGL risk is issued, it and its date will be added, and its date will link to the event's SPC archive.

• For the SPC forecast level statistics, separate slides have been added for explicitly tornado, damaging wind, and large hail forecasts. These forecasts are different from the general risk level and are recorded by percent chance (5%, 15%, etc.). 'SIG' risk areas are also tracked. However, these slides may be confusing for those who are unfamiliar with SPC forecasts. Try to familiarize yourself by checking out the Storm Prediction Center's website at spc.noaa.gov.

• Significant (EF2+ tornadoes, >75 MPH wind gusts, >2 in. hail) severe weather reports are now tracked separately.

• PDS watches/warnings are now tracked separately.

• Added several graphs to show statistic changes over time in all tracked items.

What Stayed the Same?

• SPC forecast levels are still tracked.

• NWS severe weather watches/warnings are still tracked.

• Fire risk levels are still tracked.

• Excessive heat and heat alerts are still tracked.

• Severe weather reports are still tracked.

• General thunderstorm days are still tracked.