Severe thunderstorm profile options pane

Analyze exposure data for severe thunderstorm hazards.

You access the severe thunderstorm profile options pane when creating a new hazard analysis or from the Object Management > Hazard Template section in the Administration Console.

This pane includes parameters specific to the Hazard Analysis template, and elements common to all objects. To include this hazard in the template, select the Severe Thunderstorm check box.

Return values Description Flag values
Risk
100-Year Loss Level Represents the loss amount likely to be equaled or exceeded 1 % or the time, or in one year out of 100. If the 100-year loss level is 20-25%, there is a 1 percent chance in any given year that the losses are likely to exceed 20-25% of the total value. To flag certain conditions, enter low and high loss level percentages.
250-Year Loss Level Represents the loss amount likely to be equaled or exceeded 0.4 % of the time, or in one year out of 250. If the 250-year loss is 20-25%, there is a 0.4 percent chance in any given year that the losses are likely to exceed 20-25% of the total value. To flag certain conditions, enter low and high loss level percentages.
Average Annual Loss Refers to the loss you can expect to occur per year, on average, over a period of many years. Significant events will not happen every year; therefore, it is important to note that Average Annual Loss is a long-term expected loss. To flag certain conditions, enter low and high loss level percentages.
Relative Risk
Relative Risk by County The ranking of a location's risk score with respect to other locations within the same county, expressed as a percentile. To flag certain conditions, enter low and high risk score percentages.
Relative Risk by State The ranking of a location's risk score with respect to other locations within the same state, expressed as a percentile. To flag certain conditions, enter low and high risk score percentages.
Other Information
Tornado
The frequency of tornado occurrence. Analysis results highlight the locations that experienced the exposure levels that match your selection. For example, if you select Very High and High, results include the locations in your exposure view that experienced very high or high exposure to tornadoes based on the number of events per year at each location. If you leave this box blank, no locations will be highlighted.
  • Very High: Frequency > 0.065
  • High: 0.04 < Frequency <= 0.065
  • Moderate: 0.02 < Frequency <= 0.04
  • Low: 0.007 < Frequency <= 0.02
  • Very Low: Frequency <= 0.007
 To flag certain tornado conditions, enable one or more selections in the selection list.
Hail Storm The frequency of hail storm occurrence. Analysis results highlight the locations that experienced the exposure levels that match your selection. For example, if you select Low and Very Low, the results include the locations in your exposure view that experienced low or very low exposure to hail storms based on the number of events per year at each location. If you leave this box blank, no locations will be highlighted.
  • Very High: Frequency > 1.5
  • High: 1 < Frequency <= 1.5
  • Moderate: 0.6 < Frequency <= 1
  • Low: 0.2 < Frequency <= 0.6
  • Very Low: Frequency <= 0.2
 To flag certain hail storm conditions, enable one or more selections in the selection list.
Wind Storm The frequency of straight-line wind storm occurrences. Analysis results highlight the locations that experienced the exposure levels that match your selection. For example, if you select Moderate, the results include the locations in your exposure view that experienced moderate exposure to straight-line wind storms based on the number of events per year at each location. If you leave this box blank, no locations will be highlighted.
  • Very High: Frequency > 2.7
  • High: 1.5 < Frequency <= 2.7
  • Moderate: 0.75 < Frequency <= 1.5
  • Low: 0.25 < Frequency <= 0.75
  • Very Low: Frequency <= 0.25
 To flag certain wind storm conditions, enable one or more selections in the selection list.
Nearest Historical Tornado The name, date, time and intensity of the most severe historical tornado that has occurred near a given location.
Nearest Historical Hail Storm The name, date, time and intensity of the most severe historical hail storm that has occurred near a given location.
Nearest Historical straight-line Wind Storm The name, date, time and intensity of the most severe historical straight-line wind storm that has occurred near a given location.
Note: The values in the user interface are rounded to two decimal places. In the database, however, the values are stored to five decimal places. Therefore, a rounding error may cause a discrepancy in the flagged results, which are based on the values stored in the database. For example, if you choose to flag Distance to the Nearest Fault values between 1.00 and 60.00, a value of 0.99987 would not be flagged, nor would a value of 60.00123, even though the user interface would display these as 1.00 and 60.00.