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| "The frequency storm method can be used to create a balanced, synthetic storm with a known exceedance probability. Automatic adjustments for storm area and series type are based on the exceedance probability. Depth-duration data are usually obtained from publications such as TP-40 (National Weather Service, 1961)." (HEC-HMS User's Manual) The options for defining a frequency storm are shown below:
| | #redirect [[WMS:HEC-HMS_Defining_the_Meteorological_Model#Frequency_Storm]] |
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| [[Image:HMSFrequencyStorm1.jpg|thumb|none|left|500 px|''HMS Meteorological Model'' dialog for the "Frequency Storm" method.]]
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| Follow the following steps (from the HEC-HMS User's Manual) to set up a frequency storm:
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| # Select a storm exceedance probability from the list (Exceedance probability = (1 / Return Period) * 100%). | |
| # Set the series type for the desired output.
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| # Select the maximum intensity duration and the total storm duration.
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| # Enter the precipitation depths corresponding to the selected exceedance probability for the durations between the maximum intensity and storm durations.
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| # Select the percentage of the storm duration that occurs before the peak intensity.
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| # Enter the storm area. This is equal to the total drainage area at the point where the exceedance probability will be inferred for the computed flow.
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| == Related Topics: ==
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| * [[WMS:HEC-HMS Defining the Meteorological Model|Defining the Meteorological Model]]
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| {{Template:WMSMain}}
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| [[Category:HEC-HMS|F]]
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| [[Category:HEC-HMS Dialogs]]
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