000 AXNT20 KNHC 090611 TWDAT Tropical Weather Discussion NWS National Hurricane Center Miami FL 211 AM EDT Sat Sep 9 2017 Tropical Weather Discussion for North America, Central America Gulf of Mexico, Caribbean Sea, northern sections of South America, and Atlantic Ocean to the African coast from the Equator to 32N. The following information is based on satellite imagery, weather observations, radar and meteorological analysis. Based on 0000 UTC surface analysis and satellite imagery through 0515 UTC. ...SPECIAL FEATURES... At 09/0600 UTC, the center of Hurricane Irma is near 22.3N 78.2W, or about 239 nm SSE of Miami Florida. Irma is moving W, or 280 degrees, at 11 knots. The estimated minimum central pressure is 930 mb. The maximum sustained wind speeds are 140 kt with gusts to 170 kt. Numerous strong convection is noted within 90 nm of the center of Irma. Scattered moderate to isolated strong convection is elsewhere from 18N-26N between 74W-82W. Please read the latest NHC Intermediate Public Advisory under AWIPS/WMO headers MIATCPAT1/WTNT31 KNHC and, the Forecast/ Advisory under AWIPS/WMO headers MIATCMAT1/WTNT21 KNHC for more details. At 09/0600 UTC, the center of Hurricane Jose is near 17.2N 59.6W, or about 208 nm ESE of the Northern Leeward Islands. Jose is moving WNW, or 290 degrees, at 12 knots. The estimated minimum central pressure is 940 mb. The maximum sustained wind speeds are 130 kt with gusts to 160 kt. Numerous strong convection is noted within 60 nm of the center of Jose. Scattered moderate convection is elsewhere from 16N-20N between 55W-61W. Please read the latest NHC Intermediate Public Advisory under AWIPS/WMO headers MIATCPAT2/WTNT32 KNHC and, the Forecast/Advisory under AWIPS/WMO headers MIATCMAT2/WTNT22 KNHC for more details. At 09/0600 UTC, the center of Tropical Storm Katia is near 20.3N 97.4W, or about 117 nm SSE of Tampico Mexico. Katia is moving SW, or 220 degrees, at 6 knots. The estimated minimum central pressure is 998 mb. The maximum sustained wind speeds are 40 kt with gusts to 50 kt. Katia is making landfall N of Tecolutla Mexico. Isolated moderate convection is within 90 nm of the center. Please read the latest NHC Intermediate Public Advisory issued under AWIPS/WMO headers MIATCPAT3/WTNT33 KNHC and Forecast/Advisories issued under AWIPS/WMO headers MIATCMAT3/WTNT23 KNHC for more details. ...TROPICAL WAVES... A tropical wave extends from 16N42W to a 1011 mb low near 09N46W to 05N47W, moving west at 20 knots. This wave coincides with moderate troughing in 700 mb wind fields. SSMI TPW satellite imagery indicates the wave is embedded in an area of deep layer moisture. Widely scattered moderate convection is from 12N-15N between 42W-46W, and from 07N-11N between 47W-50W. ...ITCZ/MONSOON TROUGH... The monsoon trough extends from the W coast of Africa near 12N16W to 10N30W to 09N40W to 08N49W. The ITCZ continues from 08N49W to 09N54W. Aside from the convection associated with the Atlantic tropical wave, Numerous strong convection is along the coast of W Africa from 07N-13N between 14W-17W. Scattered moderate convection is from 05N-10N between 20W-22W. ...DISCUSSION... ...THE GULF OF MEXICO... T.S. Katia is making landfall S of Tampico Mexico. Please refer to the special features section above. Moreover, the first outer feeder bands of Hurricane Irma are over S Florida and the Straits of Florida. Please consult the special features section for more information on Irma. Elsewhere, isolated moderate convection is off the coast of S Texas from 24N-26N between 92W- 97W. 10-15 kt NE surface flow is over the remainder of the Gulf of Mexico. ...THE CARIBBEAN SEA... Hurricane Irma is just north of Cuba moving W. Scattered moderate to strong convection are over central Cuba and the waters south of Cuba to 18N to include Jamaica. Elsewhere, Hurricane Jose is approaching the northern Leeward Islands. The outer feeder bands are now W of 60W. Outside of the influence of Irma, a light to moderate wind regime will prevail over most of the Caribbean as the pressure gradient to the south of Irma and Jose remains weak. Seas are generally in the 4-5 ft range over the eastern Caribbean, and 1-3 ft over the western Caribbean. ...HISPANIOLA... Convection from Hurricane Irma is now W of the island. Conditions will improve slowly during the next couple of days as ridging between Irma and Jose builds over the island. Isolated thunderstorms can still be expected over the higher terrain of the island during daytime heating as the atmosphere will remain moist enough to support deep convection. ...THE ATLANTIC OCEAN... Please see the special features section above for information concerning Hurricanes Irma and Jose. Besides Hurricanes Irma and Jose, gentle to moderate winds and seas in the 5-7 ft range prevail. Seas over the southwest north Atlantic waters are in the 9-13 foot range as a result of swell generated by Hurricane Irma. Otherwise, a 1033 mb Azores high is centered near 43N34W with ridging extending to the W Atlantic. Moderate to fresh trades are evident in satellite derived wind data between the monsoon trough/ITCZ and 25N between 20W and 50W. For additional information please visit http://www.hurricanes.gov/marine $$ Formosa