Pues el mapa de CIMSS finalmente era cierto, ya que el último boletín de discusión del CNH confirma que
hay cizalladura del NW afectando a ALEX y que, a pesar de que su organización no ha mejorado demasiado, sí ha bajado la presión en su centro y han aumentado los vientos sostenidos, hasta los 50 KT. De todos modos, contemplan una relajación de la cizalladura para mañana. Aun así
bajan 10 KT la previsión de pico de intensidad de ALEX en este boletín, de 95 a 85 KT, seguramente en respuesta a un ambiente menos bueno de lo previsto en el anterior boletín.
000
WTNT41 KNHC 281445
TCDAT1
TROPICAL STORM ALEX DISCUSSION NUMBER 12
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL AL012010
1000 AM CDT MON JUN 28 2010
ALTHOUGH THE CLOUD PATTERN OF ALEX HAS BECOME A LITTLE DISTORTED
THIS MORNING...THE CYCLONE HAS CONTINUED TO GRADUALLY INTENSIFY. AN
AIR FORCE RESERVE RECONNAISSANCE PLANE FOUND PEAK FLIGHT-LEVEL
WINDS OF 66 KT...SFMR VALUES OF 51 KT...AND A DECREASE IN PRESSURE
TO 989 MB. THUS THE INITIAL INTENSITY IS INCREASED A BIT TO 50 KT.
THE INITIAL MOTION IS 330/5...TO THE RIGHT OF PREVIOUS ESTIMATES. AN
UPPER-LEVEL TROUGH SEEN TO THE NORTH OF THE STORM MAY BE
CONTRIBUTING TO THE MORE POLEWARD MOTION BY CAUSING A WEAKENING OF
THE RIDGE OVER THE GULF COAST. THIS TROUGH IS FORECAST TO LIFT OUT
OF THE AREA IN A DAY OR SO...WHICH SHOULD ALLOW RIDGING TO BUILD
BACK IN SLIGHTLY AND STEER ALEX MORE TOWARD THE NORTHWEST. AFTER
THAT TIME...THE STRENGTH OF A RIDGE OVER THE CENTRAL PLAINS SHOULD
HELP DETERMINE WHETHER THE TROPICAL CYCLONE CONTINUES A
NORTHWESTWARD MOTION OR MAKES MORE OF A TURN TOWARD THE
WEST-NORTHWEST. THE MODEL GUIDANCE IS IN PRETTY GOOD AGREEMENT
THROUGH 48 HOURS...THEN HAS A BIT MORE SPREAD. THERE HAS BEEN A
SUBTLE SHIFT NORTHWARD WITH SOME OF THE 06Z GUIDANCE...AND THE NHC
FORECAST HAS BEEN ADJUSTED IN THAT DIRECTION.
SOME NORTHWESTERLY SHEAR IS CURRENTLY AFFECTING ALEX...ALTHOUGH THIS
HAS NOT PREVENTED THE STORM FROM SLOWLY DEEPENING. THIS SHEAR IS
FORECAST TO ABATE BY TOMORROW AS THE UPPER-LEVEL TROUGH PULLS OUT
OF THE GULF OF MEXICO...WHICH COULD THEN ALLOW FOR MORE SIGNIFICANT
STRENGTHENING. THE STATISTICAL MODELS CONTINUE TO SHOW MORE
INTENSIFICATION OF ALEX THAN THE DYNAMICAL GUIDANCE...WHICH SEEMS
REASONABLE GIVEN THE LIKELY ENVIRONMENTAL CONDITIONS. THE NHC
FORECAST IS CLOSE TO THE STATISTICAL MODELS AND THE PREVIOUS
FORECAST.
FORECAST POSITIONS AND MAX WINDS
INITIAL 28/1500Z 20.3N 91.7W 50 KT
12HR VT 29/0000Z 21.1N 92.1W 55 KT
24HR VT 29/1200Z 22.3N 92.9W 65 KT
36HR VT 30/0000Z 23.5N 94.2W 75 KT
48HR VT 30/1200Z 24.3N 95.5W 85 KT
72HR VT 01/1200Z 25.5N 97.7W 80 KT...INLAND
96HR VT 02/1200Z 26.5N 99.5W 35 KT...INLAND
120HR VT 03/1200Z 27.5N 101.5W 20 KT...DISSIPATING INLAND
$$
FORECASTER BLAKE/BRENNAN