000 AXNT20 KNHC 200520 TWDAT Tropical Weather Discussion NWS National Hurricane Center Miami FL 120 AM EDT Thu Apr 20 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... As of 20/0300 UTC, the center of Subtropical Depression ONE is near 33.2N 39.3W. The subtropical depression is moving north at 10 knots. The estimated minimum central pressure is 996 mb. The maximum sustained wind speeds are 30 knots with gusts to 40 knots. Scattered moderate convection prevails north of 30N between 30W- 41W. Please read the PUBLIC ADVISORIES about Subtropical Depression ONE under AWIPS/WMO headers MIATCPAT1/WTNT31 KNHC for more details. FORECAST/ADVISORIES about Subtropical Depression ONE are issued under the AWIPS/WMO headers MIATCMAT1/WTNT21 KNHC. ...ITCZ/MONSOON TROUGH... The Monsoon Trough extends across the western Africa coast from 09N14W to 04N17W. The Intertropical Convergence Zone continues from 04N17W to 02N36W to the South American coast near 02S43W. Scattered moderate convection is from 02S-05N between 15W-37W. ...DISCUSSION... GULF OF MEXICO... Broad surface ridging prevails across the Gulf of Mexico. An upper-level low is centered over the western Gulf near 21N92W. Upper-level diffluence to the east of the low is supporting scattered showers over the Yucatan Peninsula and channel mainly south of 23N between 84W-90W. Scatterometer data depicts gentle to moderate easterly winds across the basin. Expect over the next 24 hours for little change over the surface pattern, while in the upper levels the low over the western Gulf will drift east to the south central portion of the basin. CARIBBEAN SEA... Gentle to moderate tradewinds prevail over most of the Caribbean Sea with the exception of the central portion of the basin between 69W-74W where moderate to fresh winds were reported. These winds are also affecting the Windward Passage. A diffluent flow prevails across the western Caribbean supporting scattered showers mainly west of 75W. Scattered moderate convection is observed over portions of Central America in the proximity of a surface trough that extends over the EPAC. Portions of Costa Rica and Panama are affected by this activity as well as their adjacent waters south of 12N between 80W-84W. Expect little change over the next 24 hours. ...HISPANIOLA... Abundant cloudiness and isolated showers are over the island at this time. Expect over the next 24 hours for scattered showers to advect over the island from the east with the tradewind flow. Also, expect scattered moderate convection to form due to local instability. ATLANTIC OCEAN... The Subtropical Depression One is over the central Atlantic. Please refer to the section above for details. A broad surface ridge is over the west Atlantic. A cold front extends from 31N49W to 27N54W to 31N72W with isolated showers. Further east, a 1017 mb surface high is centered near 25N26W. Scatterometer data depicts fresh to strong northerly winds mainly north of 27N between 33W- 57W. Another area of fresh easterly winds prevails across the Bahama Islands south of 24N between 72W-80W. Expect over the next 24 hours for the Subtropical Depression to move N while dissipating. Little change is expected elsewhere. For additional information please visit http://www.hurricanes.gov/marine $$ ERA