Wisconsin Weather Update for August 9, 2010.

By: HaleStorm , 12:17 PM GMT on August 09, 2010

Good Monday morning!

Wisconsin Forecast Synopsis
A squall line worked its way across Wisconsin overnight, leading to a few severe thunderstorm watches and warnings across western and southern Wisconsin. These storms are still lingering in southeastern Wisconsin this morning, but are no longer severe.

The big weather story this week across the central United States is going to be persistent heat and humidity, thanks to an upper-air jet stream ridge covering much of the country. Heat Advisories stretch from the Gulf of Mexico northward through southern Minnesota, western Iowa, and central Illinois. High temperatures in Wisconsin will probably not make it into the 90s like in many other places, but won't be far off with mid- to upper 80s expected all week and humid dew points near or above 70. Scattered storms are also in the forecast through Wednesday, with the best chance of rain tomorrow night and Wednesday.

NowCast: (Source: National Weather Service)
Southern Wisconsin:
Showers and isolated thunderstorms will continue over southeast and portions of south central Wisconsin through the early morning. Additional rainfall of one tenth to one half inch is likely. The strong thunderstorms have pushed out over Lake Michigan...hence the severe weather threat has ended. The showers and thunderstorms will gradually diminish from west to east from 6 am through 8 am this morning.

Today’s Forecast Grade: B

Wisconsin Forecast:
Today: Morning thundershowers in southeastern Wisconsin, otherwise cloudy this morning with a few breaks of sunshine this afternoon. Very warm and humid with a high of 87. Dew points in the lower 70s. Chance of rain close to 100% in southeastern Wisconsin, only 20% elsewhere in badgerland.

Raw Model Data: (combined numerical output range from three different NOAA weather models)
Appleton: Highs 87-92. Chance of precip 8-39%.
Madison: Highs 84-92. Chance of precip 52-64%.
Waukesha: Highs 83-89. Chance of precip 54-71%.

Tonight: Partly cloudy in the Fox Valley, mostly cloudy with maybe an isolated storm overnight in southern Wisconsin. Muggy with lows near 70. Chance of rain 30% south.

Tomorrow: Mostly cloudy, very warm and even more humid. Maybe a storm in the later afternoon with a better chance of storms tomorrow night. Highs in the upper 80s to near 90. Dew points in the low to mid- 70s. Chance of rain 20% during the day, 40% tomorrow night.

Wednesday: Mostly cloudy, remaining very warm and humid with showers and thunderstorms likely. Highs 85-90. Chance of rain 60%.
Thursday: Partly cloudy. Highs 82-87.
Friday: Partly cloudy. Highs 82-87.

This Weekend’s Outlook:
Conditions: Storms possible on Saturday, dry on Sunday.
High Temperatures: Low to mid- 80s.

Other City Forecasts:
(Today and Tomorrow)

Minneapolis/St. Paul, Minnesota:
Excessive heat warning in effect from noon today to 8 PM CDT this evening...
Conditions: Sunny and hot today, scattered storms tomorrow. Humid.
High Temperatures: Lower 90s today, mid- 80s tomorrow.

Anna, Illinois:
Heat advisory in effect from noon today to 8 PM CDT Thursday...
Conditions: Partly sunny today, isolated storms possible tomorrow. Hot and humid.
High Temperatures: Upper 90s, heat index readings around 105 in the afternoon.

League City and Pearland, Texas:
Conditions: Partly cloudy, maybe an isolated storm each day. Hot and humid.
High Temperatures: Low to mid- 90s.

Hilton Head Island, South Carolina:
Conditions: Partly cloudy today, isolated storms possible tomorrow. Hot and humid.
High Temperatures: Near 90.

Charlotte, North Carolina:
Conditions: Mostly sunny, hot and humid.
High Temperatures: MId- 90s.

Las Vegas, Nevada:
Conditions: Sunny and hot.
High Temperatures: Just over 100. Congrats on finally having a high temperature below 100 yesterday for the first time in 45 days, and a low below 80 for the first time in 30 days!

Davenport, Florida:
Through 8 am...patchy fog will continue mainly over areas away from the coast. Visibilities may occasionally drop to one half mile or less at times. Motorists should slow down...use low beam headlights...and maintain a safe distance between vehicles.
Conditions: Morning fog, then afternoon and evening thunderstorms likely. Hot and humid.
High Temperatures: Lower 90s.

Weather in the News:

Colin dissipates near Bermuda

(Source: National Weather Service)
...A muggy Summer but not record breaking...
Temperatures have been above normal for much of the Summer and we
have certainly seen stretches of muggy days...but we have just
barely come close to the top 5 highest dewpoints. Dewpoints have
been a little higher than recent years which is why it seems more
noticeable...and there have been a few stretches of higher
temperatures as well. However...we have not seen the extreme high
temperatures and high dewpoints that coincide with a major Summer
heat wave. For example during the 1995 heat wave...the high
temperature on July 13 was 103 degrees with a dewpoint of
80...resulting in a heat index of 125.

Below are the top 7 dewpoint records for Milwaukee

date dewpoint temperature
7/30/1999 82 89
7/04/1977 82 93
8/06/1968 81 94
7/13/1995 80 103
9/07/1985 80 95
6/26/1978 78 89
7/24/2005 77 97

The highest dewpoint reached this Summer in Milwaukee has been 75
degrees. The Madison dewpoint has reached 77 degrees. Both of these
occured on July 22. Earlier this week Madison dewpoint reached 75
degrees on Tuesday...and Milwaukee reached 73.

Dewpoint records are not available for Madison.

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About HaleStorm

Atmospheric and Oceanic Sciences degree from UW-Madison: 1998. Former broadcast Meteorologist for NewsRadio 1310 WIBA in Madison. NWS Storm Spotter.

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N9OEQ - Darboy USA
Appleton, WI
Elevation: 735 ft
Temperature: 36.0 °F
Dew Point: 32.8 °F
Humidity: 88%
Wind: 3.1 mph from the NW
Wind Gust: 5.4 mph
Updated: 1:04 AM CST on January 09, 2016

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