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Archive for July, 2011

Jul
18

Heat & Humidity Getting Worse

Posted By · July 18, 2011 at 7:35 am

It’s not the heat… but the high humidity that will make it feel downright miserable outside.

Today, highs hit the low to mid 90s but it will feel up to 105 because of the humidity.  There’s a 30% chance for scattered showers or thunderstorms as we head into the afternoon.  Some storms North of I-70 may be strong to severe with damaging winds being the major threat.  Because the atmosphere is so moist, very heavy rain is possible in individual thunderstorm cells.  An isolated tornado or even large hail cannot be ruled out from any severe storm that pops.

Overnight, we only drop to the mid 70s with a chance for isolated showers and storms.

Tuesday begins the streak of some of the hottest and most humid days of the year.  All of Central Indiana is under an excessive heat watch Tuesday afternoon through Saturday evening.  That’s because during peak heating it will feel like 105 to 115 degrees, each day.

Take a look at the 7 day below… low and mid 90s look to settle in through the weekend.

Take care, drink lots of water, and stay cool inside as much as you can.

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Jul
17

It’s Not the Heat…It’s the Humidity!

Posted By · July 17, 2011 at 8:10 pm

Excessive Heat by Midweek in Central Indiana and much of the country. This heat index forecast for Wednesday courtesy of NOAA/HPC.

There’s no better time to explain that often spoken phrase than now.  With a week’s worth of “excessive heat” in the forecast, I thought you might like to know what goes into the heat index and how a “dry heat” as opposed to a “moist/humid heat” can make all the difference in the world as to how you feel when you step outside!

First – I have have to acknowledge the Heat Index Forecast from the Hydrometeorological Prediction Center (say that 5 times fast!)  Central Indiana is poised for midweek heat indices of 105-110!  It will feel even hotter to our west, though, where portions of the Plains and Upper Midwest will feel like 110-115!

The heat index is derived from a long and drawn-out math equation that combines temperature plus humidity to yield “apparent” temperature, or how your body feels as a result of the heat and humidity.  If you’re bored and would like to compute it for yourself…here you go!

Formula for finding heat index

where:

HI = Heat Index
T = Temperature (° F)
RH = Relative Humidity (%)

What?  Not interested in punching all those numbers into your calculator?  OK – here’s the “easy” way to compute the heat index courtesy of the National Weather Service at this link:

http://www.hpc.ncep.noaa.gov/html/heatindex.shtml

In a nutshell, the higher the temperature and the higher the Relative Humidity or Dew Point (both measure how moist the air is), the higher the heat index.

For example: Let’s say it’s 90 degrees with a dew point of 65.  The heat index = 94.  Look at the difference as dew points get higher:

Temp: 90 + Dew Point: 70 = Heat Index 97
Temp: 90 + Dew Point: 75 = Heat Index 101
Temp: 90 + Dew Point: 80 = Heat Index 107

Anytime the Heat Index exceeds 105, that’s considered the danger zone…and that’s what prompts an excessive heat watch or warning.

I’ve been watching all my friends in Minnesota (that’s where I used to live and work before moving to WTHR) suffer through 80-degree dew points today.  And that air is heading here to Indiana in the next couple days.  So ready or not, prepare to sweat.  And if you need a refresher on hot weather safety, check out this link: http://www.nws.noaa.gov/om/brochures/heatwave.pdf

Stay cool and stay safe!
-Chikage
-Meteorologist Chikage Windler Follow Chikage on TwitterBecome a fan on Facebook

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Jul
17

Heat Builds and Eyes Central Indiana

Posted By · July 17, 2011 at 6:27 am

Highs today will reach the low 90s with partly cloudy skies, and a 20% chance of a pop up shower or thunderstorm this afternoon.  It will feel closer to 100 degrees this afternoon with the humidity.  A Heat Advisory has been issued for the extreme northern section of our viewing area.  Click here to see the advisory area.

Tonight, temps drop to the low 70s with partly cloudy skies.  It will remain warm and muggy.

Monday, temps will soar into the low 90s again with feels like temps of 95 to 105 degrees.  There’s a 20% chance for an isolated thunderstorm.  Some storms may be strong to severe most likely containing damaging winds.

Starting Tuesday, all of Central Indiana is under an Excessive Heat Watch.  This means temps in the 90s combined with high humidity will make it feel like 100 to 110 from late morning to early evening each day through Friday.  Watches and warnings will be updated here throughout the day.  The best chance for rain also comes Tuesday, but it’s only a 30% chance.

This is dangerous heat.  It may seem like a silly reminder, but drink lots of water to stay hydrated, and stay in air conditioning when you can.

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Jul
16

What is an Excessive Heat Watch, Anyway?

Posted By · July 16, 2011 at 9:29 pm

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!
-Chikage
Meteorologist Chikage Windler Follow Chikage on TwitterBecome a fan on Facebook

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Jul
16

Streak of 90s Begins

Posted By · July 16, 2011 at 5:38 am

Brace yourself for the heat.

Yes… I know it’s summer, but the average temp this time of year is in the mid 80s, and we’re looking at seven days of temps at or above 90 degrees.  The heat will be dangerous with heat indices pushing close to 110 again!

Highs today will reach about 90 degrees with a 20% chance of an isolated shower or thunderstorm.

Overnight, temps only drop to the low 70s… and the humidity increases as we head into Sunday.  Sunday, highs will hit the low 90s, but it will feel closer to 100 degrees.  Once again, there’s a 20% chance of an isolated shower or thunderstorm.

Check out the 7 day for the hot temps headed our way.  Starting Monday, and lasting through Friday, it will feel like 100 to 110 degrees.

Our best shot at a little rain comes Tuesday.  So far this month we’ve only picked up .11″ of rain.  That’s 2.05″ below the monthly average.  However, keep in mind for the year, Indy is still 7.41″ above average for rainfall.

Stay cool!

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Jul
15

Weekend Preview

Posted By · July 15, 2011 at 6:59 am

Highs today will reach the mid 80s with partly cloudy skies.  All and all… one of the best days in the forecast if you like lower humidity!

Overnight, temps drop to the upper 60s under partly cloudy skies.

Saturday and Sunday, there’s a slight chance for an isolated shower or thunderstorm as temps climb close to 90 degrees.  The days won’t be a washout, but we’ll see some hit or miss activity!

Next week, the story will be the heat.  Check out the 7 day forecast below.  Temps will heat back up into the low to mid 90s.  Heat Advisories and Excessive Heat Warnings will be likely.  The humidity will also increase, and temps in the 90s will feel anywhere from 95 to 110. 

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Jul
14

Another Pleasant Day… Another Heat Wave Building

Posted By · July 14, 2011 at 6:29 am

Highs today will reach the low to mid 80s with mostly sunny skies.

Overnight, we remain dry and lows drop to the the to mid 60s.

Friday, highs hit the upper 80s… and by Saturday we may see temps in the low 90s.  There’s a very slight chance for rain early Saturday morning.

There’s not much to talk about… as we stay dry for much of the forecast.  But, get ready to feel the heat again.  Starting next Monday temps remain in the 90s, and we could possibly hit the mid 90s by Wednesday.

If you’re hoping for rain, the chances don’t look good.  So far this month we’ve picked up .11″ of rain, that’s more than an inch and a half below average for the month.

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Jul
13

Relief is Here!

Posted By · July 13, 2011 at 5:37 am

Highs today will reach the low 80s with partly cloudy skies and the chance for an isolated shower or thunderstorm through midday.  The good news?  The temps are lower… and humidity is down too.  This is the first time since July first that temps have been below average!  The average temp is in the mid 80s this time of year!

Overnight, temps drop to the low 60s and we remain dry under partly cloudy skies.

Thursday, temps remain nice and comfortable in the low 80s.

Friday we warm into the mid to upper 80s with a slight chance for an isolated shower or thunderstorm.

By the weekend, we’re back in the 90s! 

No significant rain is headed our way as of the 7 day forecast.  Stay tuned… we’ll keep you posted!  I know your lawns and gardens are thirsty!

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