000 AXNT20 KNHC 090002 TWDAT Tropical Weather Discussion NWS National Hurricane Center Miami FL 802 PM EDT Fri Sep 8 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 1800 UTC surface analysis and satellite imagery through 2300 UTC. ...SPECIAL FEATURES... At 09/0000 UTC, the center of Hurricane Irma is near 22.0N 77.2W, or about 275 nm SE of Miami Florida. Irma is moving W, or 280 degrees, at 10 knots. The estimated minimum central pressure is 924 mb. The maximum sustained wind speeds are 135 kt with gusts to 165 kt. Numerous moderate and scattered strong convection is noted within 90 nm of the center of Irma. Scattered moderate and isolated strong convection is found elsewhere in the south semicircle within 210 nm and in the north semicircle within 150 nm. 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 09/0000 UTC, the center of Hurricane Jose is near 16.7N 58.8W, or about 265 nm ESE of the Northern Leeward Islands. Jose is moving WNW, or 285 degrees, at 15 knots. The estimated minimum central pressure is 938 mb. The maximum sustained wind speeds are 130 kt with gusts to 160 kt. Numerous moderate and scattered strong convection was noted within 60 nm of the center of Jose. Scattered moderate to isolated strong was noted elsewhere from 15N to 19N between 55W and 60W. 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 09/0000 UTC, the center of Hurricane Katia is near 20.9N 96.8W, or about 115 nm SE of Tampico Mexico. Katia is moving WSW, or 250 degrees, at 7 knots. The estimated minimum central pressure is 972 mb. The maximum sustained wind speeds are 90 kt with gusts to 110 kt. Numerous moderate and isolated strong convection was noted within 30 nm of the center. A surface trough extending NNW from Katia to the Tamaulipas coast near 25N97W is supporting scattered moderate and isolated strong convection elsewhere from 21N to 26N between 95W and 98W. 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 has an axis extending from 04N42W to 21N41W, moving westward around 20 knots. This wave coincides with moderate troughing in initial model 700 mb wind fields. TPW satellite imagery indicates the wave is embedded in an area of deep layer moisture. Scattered moderate and isolated strong convection is noted from 12N to 14N between 40W and 47W. ...ITCZ/MONSOON TROUGH... The monsoon trough extends from Senegal on the coast of Africa near 11N14W to 09N20W to 10N33W to 08N40W to 09N46W. The ITCZ continues from 09N46W to 08N50W to 09N53W. Aside from the convection associated with the Atlantic tropical wave, Numerous moderate and isolated strong convection is observed from 07N to 11N between 13W and 16W. Scattered moderate and isolated strong convection is seen from 05N to 10N between 18W and 22W and within 30 nm either side of a line from 06N25W to 09N33W. ...DISCUSSION... ...THE GULF OF MEXICO... Please refer to the special features section for more on Hurricane Katia, located over the southwest Gulf. The circulation of Hurricane Irma will be large enough to cause winds over the Gulf of Mexico E of 90W to increase Saturday through Tuesday. Please consult the special features section for more information on Irma. Outside of the influence of Katia, moderate to fresh winds prevail, with seas in the 1-3 ft range over the eastern Gulf and 4-6 ft range over the western Gulf. ...THE CARIBBEAN SEA... Hurricane Irma is passing just north of Cuba. Scattered moderate and isolated strong convection will affect the waters south of Cuba and north of 20N through Sunday night. Fresh to strong winds to the south of Irma will occur over the waters south of Cuba and north of 18N during the same time frame. 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... The center of Hurricane Irma is passing north of central Cuba. Convergent low-level flow into Irma is supporting isolated thunderstorms over the Dominican Republic. 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, an Azores high centered near 43N34W dominates the remainder of the Atlc Ocean. 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 $$ McElroy