![]() Unusually high dew points in the region persisted for a couple days, aided by evaporation from soil and a stable layer of air aloft that prevented moist air in the lowest few thousand feet from mixing with drier air above. The July 1995 heat wave resulted in the deaths of 750 people in Chicago and other cities in the region recorded amazing dew points as well such as Cedar Rapids, Iowa: 84° (heat index 129°) and Oelwein, Iowa 85° (heat index 131°). METARS chart for Appleton, Wisconsin on Jfrom. Here are the METARS for Appleton that day: The air temperature stood at 101° in Appleton at that time leading to a heat index reading of 148°, perhaps the highest such reading ever measured in the United States. But it was during the July heat wave of 1995 that the highest dew point of all was measured in the Upper Midwest: 90° at Appleton, Wisconsin at 5 p.m. on Jas was Milwaukee, Wisconsin’s with an 82° the same day. Chicago, Illinois’s highest dew point was 83° at 8 a.m. Last summer (2010), Newton, Iowa recorded an 88° dew point on July 14th. Highest Dew Point Measurements in the United States Photo courtesy of the Grand Forks, North Dakota National Weather Service Office. Furthermore, the AWOS is surrounded by sugar beets and soy beans “two of the most prodigious transpiring plants”.Ī photograph of the Moorhead Airport Automated Station tat registered the 88° dew point on July 19th. The NWS office in Grand Forks, North Dakota issued this statement explaining how heavy rainfall the morning of the event had saturated the soil and left ponding water near the instrument site. Another site in Minnesota, Madison, also registered an 88° dew point (although this site may not be considered an official reporting station). On July 19th not only did Moorhead record its highest dew point on record but so did Minneapolis with an 82° (and possibly even 84° for a five minute period between 3:21-3:27 pm) on the same day. ![]() Unfortunately the dew point table does not consider dew points above 82°. Two graphics illustrating the affect of humidity on the apparent feel of the temperature: at top is NOAA’s Heat Index chart (% of humidity with air temperature) and below that the effect of dew point with air temperature. One possible factor is that the worst heat waves in the area sometimes occur following heavy rainfalls that have saturated the ground and lowest levels of the atmosphere whereas other more southern places usually reach there highest temperatures during periods of drought, as is the current situation in the Southern Plains. I have not been able to discover just why the dew points in Iowa, Minnesota, and Wisconsin sometimes are higher than anywhere else in the United States during exceptional heat waves versus, say, Missouri or other states that are generally more humid and also endure exceptional summer heat. Although for the most part this is true the other region that occasionally seems to record extraordinary heat and humidity is the Upper Midwest. One might assume that the highest dew points measured in the United States would be those observed during in areas along or near the coast of the Gulf of Mexico during the summer months. The 88° Dew Point Measured at Moorhead, Minnesota on July 19, 2011 Here is a brief summary of record dew point levels from both the U.S.A. This would also be one of the highest dew points ever observed in the United States. Thank you for listening to the weather report from LocalConditions.Just recently the Minnesota State Climate Office issued a statement declaring the 88° dew point temperature measured at Moorhead (on the Red River across from Fargo, North Dakota) between 7pm and 9pm on Jas a new all-time state record for the highest such reading ever observed. Breezy, with a south wind 10 to 15 mph increasing to 15 to 20 mph in the afternoon. Thursday has an expected forecast of Mostly sunny, with a high near 64. The forecast for Today is Sunny, with a high near 64. The moon phase is a Waxing Crescent Moon. Sunrise is at 6:41 AM and Sunset is at 4:28 PM. Wind direction is SouthWest at 14 miles per hour, gusting at 18 mph. The humidity is 45.7 percent with a dew point of 26.6 degrees fahrenheit that is falling since the last report. ![]() The barometric pressure is 30.09 - measured by inch of mercury units - and is steady since its last observation. It is 46 degrees fahrenheit, or 9 degrees celsius and feels like 46 degrees fahrenheit. The current weather report for South Milwaukee WI, as of 5:45 AM CST, has a sky condition of Partly Cloudy with the visibility of 10.00 miles.
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