What is an Excessive Heat Watch, Anyway?

The Excessive Heat Watch for Central Indiana goes into effect Tuesday PM and continues through Friday PM

If you’ve been following the forecast, you’ve probably heard about the heat wave heading this way.  But unlike the last time was had high heat and humidity, this time, the National Weather Service has posted an Excessive Heat Watch for us days in advance.

What it means to you is that the combination of heat and humidity will create dangerous conditions this upcoming week.  Excessive Heat Watches are issued when the following conditions are expected: Highs in the 90s or hotter, dew points in the mid 70s or higher, and heat indices of 105 or more.  And unfortunately, that’s what Central Indiana will likely be seeing as early as Tuesday and continuing through the end of the week.

Tomorrow and Monday, it will still be hot, but not quite hot enough to prompt a heat warning.  Highs in the low 90s plus dew points in the 70s may give us heat indices in the upper 90s to around 100.

Check out the heat index chart and you’ll see that heat index values of 105 or higher are in the “Danger” zone.  You’ll want to take it easy this week!

Today’s high of 89 wasn’t quite enough to add to our growing list of 90-degree highs.  We’re at 13 so far this year.  Tomorrow through Saturday should add another 7, which would put us above the average of 18 days/year.  Hot stuff?  Yes.  Hottest ever?  Not by a long shot.  Back in 1936, several days in July hit 106!  That’s the hottest on record for Indianapolis.  No signs of that kind of heat anytime soon, thank you very much!!

Stay cool and take care!
Meteorologist Chikage Windler Follow Chikage on TwitterBecome a fan on Facebook