Possible Heat Advisory for Sunday and Monday
Gwinnett is preparing for some of the warmest weather of the season over the next few days, with heat indexes possibly rising to the point where the Weather Service will post an advisory for people to stay indoors.
Today’s high temperature of 92.9 here at my weather station marks the third straight day of above 90 degree temperatures. Fortunately, a front moving into the area from the north has lowered the dewpoint considerably from what we’ve seen in previous days. Today’s mid afternoon dewpoint was six degrees lower than it was at this time yesterday, meaning a heat index of 95 instead of yesterday’s 105, which is the high for the summer.
Sunday and Monday are likely to be warmer than today, and while the effects of the ridge will likely keep rain away, it will weaken, and give us higher humidity and more discomfort. By Thursday, we could see some thundershowers, and this wave of heat could be history by Friday.
While temperatures in the 90s are an expected part of life in Georgia, that isn’t the case for much of the rest of the country, which is also suffering from extreme heat. Here are some temperatures, measured close to 6 PM. The first number is the temperature, while the second is the heat index:
Memphis - 94 (108)
Carroll, Iowa - 97 (119)
Des Moines - 97 (113)
Ainsworth, Nebraska - 104 (101)
Kansas City - 98 (106)
Brookings, SD 97 (112)
St. Louis - 96 (117)
Boise - 89 (85)
Denver - 93 (89)
It’s interesting to note the fact that for the far west, the heat index is lower than the actual temperature. That’s because the relative humidity is in the teens. For example in Denver, the temperature is 93 and the dewpoint is 40, with 16 percent relative humidity.
Meanwhile, as far as tropical weather goes, Franklin seems to be heading into the Eastern Atlantic, and doesn’t appear to be a threat, although there is a chance it could curve west again, and threaten the Carolinas. Tropical Depression Seven has been declared in the Gulf of Mexico, and is likely to develop into tropical storm Gert before it makes landfall in central Mexico sometime Sunday night.
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