June 2009 Archives
4:22 PM Wed, Jun 24, 2009 | Permalink
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There may be some much-needed relief from this unusual heat wave soon.
First of all let me explain the unusual part. If you've lived in St. Louis for any length of time you know that sccessive days of 90+ temperatures is nothing unusual here in the Summer. But normally these heat waves take place in July and August. The longest successive 90+ heat wave is 28 days long! (it ended on July 30, 1936).
So when will...
9:06 PM Mon, Jun 22, 2009 | Permalink
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Heat Index = -42.379 + 2.04901523T + 10.14333127R - 0.22475541TR -
6.83783x10-3T2- 5.481717x10-2R2 + 1.22874x10-3T2R + 8.5282x10-
4TR2 - 1.99x10-6T2R2
where T = ambient dry bulb temperature (°F)
R = relative humidity (integer percentage).
Well that explains it!
Uhh....not really.
Actually, that is a version of the equation behind our heat index ca...
4:41 PM Sat, Jun 20, 2009 | Permalink
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The Urban Heat Island Effect is why urban areas are warmer than rural areas. It's the altered landscape of a city that helps keep the temperature warmer than the rural areas.
For example, asphalt parking lots, roads, and concrete buildings can retain more heat than rural areas with shade and vegetation. In fact, the EPA estimates that these urban surfaces can be 50 to 90 degrees hotter than the air temperature!
All the concre...
4:04 PM Thu, Jun 04, 2009 | Permalink
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Although it has been soggy in the past week or so, we're 0.24" below normal for precipitation on the year so far. But I checked the climate database and since May 25th we've had 6 of 10 days recording .10" or more at St. Louis Lambert International Airport. And from May 25th to June 3rd there was 3.98" of rain at St. Louis Lambert. That's more than the monthly normal rainfall from the whole month of June and we had it come down in a...
4:27 PM Mon, Jun 01, 2009 | Permalink
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Hard to believe we didn't have any 90 degree temperatures in May, but on Monday, June 1st we hit 92 which is the hottest of the year...so far. What's interesting is that while we should be near 90 again Tuesday, the bottom then falls out.
Highs may not reach 70 on Wednesday and we could be near record lows by Thursday morning!
What's happening?
It's a combination of a cold front passing Wednesday morning and the...
