Welcome to the revised and updated severe weather database page! On this page you will find an assortment of statistical and other relavent data for the coverage region we serve. Just below in the first table, we illustrate the current and most recent tornadoes by state within our region, and the number of tornado related deaths each year. Down further, we show any strong and/or violent killer tornadoes which have occurred, and the circumstances for each. Next, we illustrate all severe weather "extremes" which occurred in our region (tornadoes, large hail, and damaging winds (Derecho events)). Finally, we look at trends into the future. It's comprehensive and informative information.

STATE 2015 2014 2013 2012 DTH 2015 DTH 2014 DTH 2013 DTH 2012
WISCONSIN 07 22 17 37 00 00 00 00
MINNESOTA 11 24 37 16 00 000 000 003
IOWA 20 65 16 65 00 00 00 00
ILLINOIS 52 46 33 52 00 00 00 00
INDIANA 09 29 21 51 00 00 00 00
MICHIGAN 05 09 06 05 00 00 00 00
TOTALS 104 195 130 226 000 000 000 000

Note: Tornado deaths in the table above are noted by "DTH".



The following information will describe how to interprete the table just above. 

Fatalities by state: This is the total number of tornado related fatalities by state.
Fatalities by county: This is the total number of tornado related fatalities by county.
Fatalities by circumstance: This is the number of fatalities based on circumstances shown

A = In a Tornado watch area.
B = In a Severe Thunderstorm watch area.
C = Close to a watch area {15 minutes or 25 miles}.
D = No watch was valid.
F/EF = Original Fujita and Enhanced Fujita tornado intensity scale rating.
H = Inside a house.
M = Inside a mobile home.
O = Engaged in outdoor activity.
P = Inside a permanent building, or similar structure.
V = Inside a vehicle.
? = Unknown circumstance.
WS = A Severe Thunderstorm watch, {Number}.
WT = A Tornado watch, {Number}.

All tornado related fatalities will be entered on the table (above) once they are confirmed by the National
Weather Service offices. 

Violent (Killer) Tornadoes across the region

The overall trend for major tornadoes across our coverage region appears to be in a steadily declining state. This is largely due to less frequent clashes between warm moist Gulf air streaming north, and cooler drier Canadian air streaming southward. The overall positioning of the primary jet stream either further north or south of our region too, has resulted in fewer favorable major tornado producing patterns getting into our coverage region. Tornado related fatalities remains about the same, though may have notched up a tad in recent years. Figure 1 shows the number of violent (killer) tornadoes which have been reported in the coverage region from 1950 to 2010, and the respective trend. Violent tornadoes are considered F3 to F5 on the Fujita tornado scale (or EF3 to EF5 on the enhanced Fujita scale).

FIG. 1

Even fewer violent tornadoes have occurred across the coverage region since 2000 all the way to 2012. While considerable debate continues, it is currently believed that due to "El-Nino" and/or "La-Nina" influences during this period, have driven the jet stream further north across Canada during the peak severe weather season. As a result, overall trends in severe weather across our region have been markedly lower. The following table illustrates the downward trend in violent killer tornadoes across our coverage region from 2000-2012.

FIG. 2 2000

FIG. 3 2001

FIG. 4 2002

FIG. 5 2003

FIG. 6 2004

FIG. 7 2005

FIG. 8 2006

FIG. 9 2007

FIG. 10 2008

FIG. 11 2009

FIG. 12 2010

FIG. 13 2011

FIG. 14 2012

FIG. 15 Composite

As with tornadoes, other forms of severe weather "extremes" would include very large diameter hail (=> 2 inches in diameter), and extremely damaging winds (Derecho events). While lightning is a serious hazard, and has already caused numerous deaths, it does not really fit into the severe weather category. Extremes with large hail and Derecho events are fairly rare across our coverage region, although they have occurred. In the table below, these wind and hail events are summed up with composite graphics which span the period from 2000 to 2012. Again, these composites illustrate only the extremes of both hazards.

FIG. 15 Hail Composite

FIG. 16 Derecho Composite