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Tropical Depression Ernesto - 35 mph - 1004 mb - W 14 mph


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TROPICAL STORM ERNESTO DISCUSSION NUMBER 33

NWS NATIONAL HURRICANE CENTER MIAMI FL AL052012

1000 AM CDT THU AUG 09 2012

SURFACE OBSERVATIONS AND AIRCRAFT DATA INDICATE THAT THE CENTER OF

ERNESTO IS MOVING ALONG OR VERY NEAR THE COAST OF MEXICO IN THE

VICINITY OF COATZACOALCOS. VISIBLE SATELLITE IMAGES INDICATE THAT

THE CLOUD PATTERN IS STILL VERY WELL ORGANIZED WITH NUMEROUS

CONVECTIVE BANDS. THE SOUTHWEST FLOW FROM THE SOUTHERN HALF OF THE

CIRCULATION IS ENHANCING THE CONVECTION ON THE PACIFIC SIDE OF

MEXICO AND WILL PROBABLY INCREASE THE RAIN IN THE AREA. BASED ON

RECONNAISSANCE DATA...THE INITIAL INTENSITY HAS BEEN LOWERED TO 50

KNOTS. SINCE THE CENTER IS FORECAST TO MOVE INLAND AND A LARGE

PORTION OF THE CIRCULATION IS INTERACTING WITH HIGH TERRAIN...

WEAKENING IS FORECAST. ERNESTO IS LIKELY TO BECOME A REMANT LOW IN

ABOUT A DAY OR TWO...HOWEVER HEAVY RAINFALL WILL CONTINUE TO

PRODUCE THE THREAT OF FLASH FLOODING OVER MUCH OF SOUTHERN MEXICO

FOR THE NEXT FEW DAYS.

THE BEST ESTIMATE OF THE INITIAL MOTION IS 260 DEGREES AT 9 KNOTS.

ERNESTO IS ALREADY TRAPPED SOUTH OF A HIGH PRESSURE AREA...AND THIS

FLOW PATTERN IS NOT EXPECTED TO CHANGE FOR THE NEXT COUPLE OF DAYS.

THE NHC FORECAST CALLS FOR A WEST TO WESTSOUTHWEST TRACK...BRINGING

ERNESTO INLAND OVER MEXICO UNTIL DISSIPATION IS A DAY OR SO.

FORECAST POSITIONS AND MAX WINDS

INIT 09/1500Z 18.2N 94.3W 50 KT 60 MPH

12H 10/0000Z 17.8N 95.5W 35 KT 40 MPH...INLAND

24H 10/1200Z 17.5N 97.5W 30 KT 35 MPH...INLAND

36H 11/0000Z 17.0N 100.0W 25 KT 30 MPH...POST-TROP/REMNT LOW

48H 11/1200Z...DISSIPATED

$$

FORECASTER AVILA

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Terrain in this area of Veracruz is severe very close to the center. It looks like Ernesto dove southward to avoid a head-on collision with Volcan San Martín Tuxtla, peak elevation 5500 feet. He will strike more severe terrain tonight, this time unavoidably. If he survives his encounter, models have suggested potential redevelopment in the Mexican Riviera.

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There's some discussion of verification for Ernesto in the other thread. We should probably move it to here guys.

I saved this one from 18Z on the 4th. The GFS (green line, labeled AVNI) absolutely nailed the track. Maybe the GFS intensity was a bit off, but correctly depicting pulsing convection was never the GFS's strong point.

post-378-0-75459500-1344618466_thumb.png

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