Latest on the Remnants of Sandy and Local Effects

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The remnants of Sandy are forecast by the NWS Hydrometeorological Prediction Center to continue to drift northward  across the eastern Great Lakes. Widespread impacts will continue to occur across the Mid-Atlantic, Northeast and Great Lakes. For the latest information, follow:

 

 NWS Hydrometeorological Prediction Center Forecast

HPC Forecast

    While tropical cyclones rarely come as far north and west as northern Illinois and Indiana such as Isaac had in September, tropical cyclones can still have impacts on the local area even when remaining over a thousand miles away.  A tropical system, or its remnants that become "extratropical", can have a massive radius of influence on the weather pattern.  Because of their size and depth, they can alter, shift, or slow a typical jet stream regime, changing the progress of other weather systems.  

   Now that Sandy has moved inland the local area is feeling its effects, despite the center of the low pressure system being hundreds of miles to the east.  The primary impact will be continued northerly winds over and near Lake Michigan thanks to the outer influence of Sandy and its remnants. For more on the large waves being generated on Lake Michigan, see the NWS Great Lakes Portal and the latest Lake Michigan Forecast.  Wind to similar magnitude as seen over the lake will  occur in Lake and Porter Counties, IN.  A Wind Advisory is in effect for these counties until late tonight, and a Lakeshore Flood Warning remains in effect for this area as well as Cook County.  Impacts may be similar to the September 30-October 1, 2011 storm.  A table of the highest wind gusts from around southern Lake Michigan as of 6 am CDT can be found below.

 

Highest winds recorded as of 8 am CDT

Location

Speed (mph/kt)

Harrison Crib

58/50

Burns Harbor

54/47

Michigan City

68/59

St. Joseph, MI

54/47

South Buoy

54/47 (20.3 ft waves)

     Waves at the southern Lake Michigan mid-lake buoy have reached 21.7 ft as of 12 pm CDT, which means this storm now has produced the 2nd highest peak wave height  ever recorded at the southern Lake Michigan mid-lake buoy.  Here is a ranking of the top 5 largest wave producing storms as recorded at the southern Lake Michigan mid-lake buoy.

 

Rank

Storm Date

Peak Wave

1

9/30/2011

22.9 ft

2

10/30/2012

21.7 ft

11/11/1998

20.3 ft

4

10/20/2011

19.2 ft

5

9/23/1989

18.4 ft


* through 12 pm CDT 10/30/2012 

 

 As a result fo the prolonged North winds, the Lake Michigan water levels have risen substantially as well. Lake levels have been running several inches below normal, and have risen to a peak of nearly 10" above normal over the past 24 hours. Here is an image from early this afternoon (Tuesday 30Oct2012) showing the change in Lake Michigan water levels from Calumet Harbor, IL.

Lake Michigan Water Levels

 

     The western flank of a large precipitation shield from the outer edge of Sandy will continue to move westward into northwest Indiana this morning and likely remain in the area through the evening hours. this will result in a good chance for rain showers but they will have to fight drier low level air before reaching the ground.  The westward progress is forecast to slow as the precipitation reaches the Illinois-Indiana border this morning.

Weather Story

 



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