Oppressive Heat & Humidity Return
July 02, 2012 10:37 AM
A Heat Advisory has been issued by the National Weather Service in effect from Monday afternoon through Friday evening in advance of some very dangerous heat and humidity.
(Heat Advisory in effect through Friday 7pm CST)Air temperatures are forecasted this week to be in the 90's and 100's. With dew point temperatures reaching into the upper 60's and 70's that makes for a dangerous heat index. A Heat Advisory was issued from Monday through Friday as the Heat Index is forecasted to raise well into the triple digits.Even with Hot temperatures into the 90's and 100's, humidity will make temperatures feel even warmer and make the heat more dangerous for your health. For more on Heat Index click HERE As always, use common sense when it comes to your exposure to the heat. Elderly and infants are more sensitive to heat and it can effect them much more than a normal healthy adult. It is also important to keep an eye on your animals; make sure they have plenty of fresh clean water and access to shade.Heat related illnesses can come on very quickly in extreme weather. Pay attention to your body and look for the warning signs of heat related illnesses. If you find yourself or someone else suffering from heat related illness move to a cool/dark room and seek medical attention.Temperatures will stay very warm and humid for an extended period of time due to the fact that the jet stream has retreated well into Canada and surface high pressure has set up just south of our area. The jet stream, which acts like a road for storm systems will continue to bring storm systems north of our area keeping our area mostly dry for the next 7 days. Surface high pressure also allows air temperatures to warm significantly and spread farther north. Southerly winds will funnel warm, moist air directly over Eastern South Dakota. The combination of dry weather, hot air and moisture creates the perfect scenario for very high heat index values directly over our area.With high pressure in place, only isolated showers have been able to form. These isolated showers only provide rainfall to very localized areas and will generally be light. The hot weather and lack of rain in some areas is really starting to cause problems in some areas, especially in Sioux Falls. It has been since June 13th since Sioux Falls has had a quarter of an inch or more of rain. While Sioux Falls currently is not seeing drought conditions, drought conditions are developing and they are developing fast. With no substantial rain in the forecast for at least the next 7 days and temperatures forecasted to be near the triple digits it will not be surprising to see abnormally dry conditions to develop in the southeast soon.
With Fourth of July this week, fireworks will pose a major threat to dry areas so much so that many towns are calling off firework shows all together. More on that HERE
Have a very safe and cool Fourth of July!