000 AXNT20 KNHC 091157 TWDAT Tropical Weather Discussion NWS National Hurricane Center Miami FL 757 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 0600 UTC surface analysis and satellite imagery through 1015 UTC. ...SPECIAL FEATURES... At 09/1200 UTC, the center of Hurricane Irma is near 22.6N 79.6W, moving WNW, or 275 degrees, at 10 knots. The estimated minimum central pressure is 937 mb. The maximum sustained wind speeds are 110 kt with gusts to 135 kt. Numerous strong convection is noted within 60 nm of the center of Irma. Scattered moderate to isolated strong convection is elsewhere from 17N-27N between 74W-83W. 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 09/1200 UTC, the center of Hurricane Jose is near 17.8N 60.7W, moving NW, or 305 degrees, at 11 knots. The estimated minimum central pressure is 944 mb. The maximum sustained wind speeds are 125 kt with gusts to 150 kt. Numerous strong convection is noted within 45 nm of the center of Jose. Scattered moderate convection is elsewhere from 16N-21N between 56W-63W. 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 09/1200 UTC, the center of Tropical Depression Katia is near 20.1N 97.7W, moving WSW, or 255 degrees, at 2 knots. The estimated minimum central pressure is 1004 mb. The maximum sustained wind speeds are 25 kt with gusts to 30 kt. Isolated moderate convection is within 45 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 15N44W to 10N49W to 05N49W, 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-14N between 40W-47W, and from 07N-09N between 49W-51W. ...ITCZ/MONSOON TROUGH... The monsoon trough extends from the W coast of Africa near 12N16W to 10N20W to 11N30W to 10N40W to 08N48W. The ITCZ continues from 08N51W to 11N57W. Aside from the convection associated with the Atlantic tropical wave, Numerous strong convection is along the coast of W Africa from 09N-13N between 16W-19W. Scattered moderate convection is elsewhere from 06N-14N between 15W-24W. ...DISCUSSION... ...THE GULF OF MEXICO... T.S. Katia has stalled at the foot of the Sierra Madre Mountains, Mexico. Please refer to the special features section above. Moreover, the 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, scattered moderate convection is off the coast of NE Mexico from 24N-26N between 95W-98W. 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 have reached of 63W. 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 continues over W Haiti. 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 T.S.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 1031 mb Azores high is centered near 43N32W 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