Experimental Ice Impact Index 

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 National Weather Service

 St. Louis Missouri

 

 

The Ice Impact Index categorizes damage potential through the use of: (1) researched weather parameters and utility impacts and (2) the combination of forecast parameters including radial ice accumulation, wind and temperatures. The Ice Impact Index is an Experimental Product with coordination with National Weather Service Offices in Missouri, Oklahoma, Arkansas, Texas and Tennessee. As an experimental product, there may be times it is not available. Additional information on the Ice Impact Index can be found in the Presentations and Paper sections of this webpage.  If you have questions, comments or feedback on this test product, please contact the National Weather Service at the contact infomation listed at the bottom of the page. Please let us know what you think of the index by filling out the survey which can be found here: Survey

 

Index

Utility Damage and Impact Description

1

Some local utility interruptions possible...typically lasting a few hours.

2

Scattered utility interruptions possible...typically lasting less than 12 hours.

3

Numerous utility interruptions possible...lasting up to 5 days.  Damage to some main feeder lines possible.

4

Prolonged and widespread utility interruptions. Damage to many main feeder lines possible. Utility outages lasting up to 10 days possible.

5

Catastrophic damage to exposed utility systems possible. Outages lasting several weeks possible in some areas.

  

Day

Ice Accumulation

Maximum Wind Speed (mph)

Ice Impact Index 

Day 1

Day 2

 

 

 

Day 3

 

 

 

For information on possible winter storms in the Day 4 - 7 time frame, please consult the Hazardous Weather Outlook:

 http://forecast.weather.gov/product.php?site=lsx&product=HWO&issuedby=lsx

Additional weather forecast information can also be found on the office home page.

http://weather.gov/stlouis

 

Total Ice Accumulation Forecast

 

 

       

Forecast Info

 Forecast Discussion       

 Hazardous Weather Outlook      

Presentations

 Utility Ice Index Informational Presentation  Sidney K. Sperry 

Paper

Paper that outlines the experiment: http://products.weather.gov/PDD/SPIA_pdd.pdf 
Utility Ice Index Paper Gary D. McManus, S.F. Piltz, S. Sperry, R.A. McPherson, A.D. Gartside, D. McClain, T.Meyer, C.Fetsch and M.A. Shafer

 

 


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