CIMMSE TC Wind GroupConference Call

Wednesday, May 8th, 201311:30 AM

Agenda

• Climatology Paper Update• Error Function Update

Climatology Paper Update

• Draft of paper has been completed (WAF)• Overview– Decay once over land– NDFD verification using CRONOS/H*Wind

Analyses– Gust factors as function of location, sustained

wind speed, and wind direction• Will forward copy of draft soon for review– Comments encouraged

8

Error Function Update

• Can create improved Holland Interpolated Wind Field:

Holland_Improved(q, d) = Holland_Interp(q, d) - Normalized Holland Interp Error Function (q, d) * Max Wind

• Likewise, can create improved Modified Rankine Wind Field:

Rankine_Improved(q, d) = Rankine_Interp(q, d) - Normalized Rankine Interp Error Function (q, d) * Max Wind

Summary

• In general, Modified Rankine with error function appears superior to other interpolations– Improvements most dramatic near core of storm– Do not need to code much within TCMWindTool (just add function to

interpolated wind fields)• Will make images and radial plots available online for viewing

– Comments welcome• Focuses this month:

– Climatology paper edits, taking into account comments from the wind team

– TC Boundary Layer Literature Review• Set up focus for modeling studies

TCWindReduction Smart ToolReid Hawkins, SOO

Wilmington, NC

CSTAR Tropic Wind – Element Group

Smart Tool

• WindGustFactor & WindReductionFactorgrids ISC sharable.

• Names and number of edit areas areconfigurable.

• 1st guess reduction percentages areconfigurable.

• Edit areas should be set up prior to event, but could be changed on fly by focal point.

WindReductionFactor Grid

Smart Tool

Examples

Example of Tropical Cyclone Winds afterTCMWind complete.

Example of winds after wind reduction factorshas been applied.

Discussion

Next Conference Call: Wednesday, June 5th, 2013 11 AM