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Joint Typhoon Warning Center (JTWC)

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Click on the red text labels below for details about information contained on the warning graphic.

 

 

The Area of Potential Gale Force Winds

The Area of Potential Gale Force Winds is determined by adding the 34-kt wind radii to the 5-year running mean JTWC official forecast track error at each corresponding forecast time.

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Forecast Track

Colored tropical cyclone symbols represent forecast positions (typically at 12, 24, 36, 48, 72, 96 and 120 hours). The line between these positions is the forecast track.

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Wind Radii

For tropical cyclone positions with intensity >= 34 knots, the outermost radii represent the maximum extent of 34-knot winds within each quadrant*.
For tropical cyclone positions with intensity >= 50 knots, the next set of wind radii positioned within the 34-knot radii represents the maximum extent of 50-knot winds within each quadrant*.
For tropical cyclone positions with intensity >= 64 knots, the next set of wind radii positioned within the 50-knot radii represents the maximum extent of 64-knot winds within each quadrant*.

* Note, wind speeds observed throughout a large proportion of each quadrant may be less than the designated threshold value (i.e., wind speeds matching the designated threshold value may be confined to a small geographic area within each indicated radius)

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Time Labels

Labels indicate the time of the current and forecast positions.

Example: 1012Z
10 = day of month (10th)
12 = hour of day (noon)
Z = universal time/Zulu

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Current Postion

The current position is the black tropical cyclone symbol at which the forecast track begins.

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Past Positions

The black tropical cyclone symbols are the current and past positions.  The symbols represent 6-hourly positions.

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