How are JTWC forecasts different than forecasts issued by tropical cyclone warning centers (TCWCs) of other countries?
One difference is the measurement of maximum sustained surface winds. JTWC uses the 1-minute mean wind speed to determine maximum sustained surface winds, as required by the U.S. National Hurricane Operations Plan. Other countries, however, use the 10-minute mean wind speed to determine maximum sustained surface wind speeds. The difference generally means that JTWC will report higher maximum sustained surface wind speeds than non-U.S. TCWCs for the same cyclone. Another difference is that JTWC will issue forecasts out to 120 hours in the North Pacific Ocean as required by U.S. DoD. Back to top Q: Why isn’t minimum central pressure included in the best track data? A: Because central pressure is rarely measured within tropical cyclones in JTWC’s area of responsibility (AOR), central pressure is not included in JTWC best track data or warnings. Back to top Q: My Internet Explorer window is resizing JTWC graphics, which makes the text illegible. How do I correct this? A: This problem occur
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