000
AGXX40 KNHC 280453
MIMATS

MARINE WEATHER DISCUSSION
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
130 AM EDT SAT APR 28 2007

MARINE WEATHER DISCUSSION FOR GULF OF MEXICO...CARIBBEAN SEA
AND SOUTHWEST NORTH ATLC S OF 31N W OF 55W.

A STRONG SHORTWAVE IN THE NRN BRANCH IS HEADING ESE OVER THE MO 
VALLEY TONIGHT. A WEAKER SHORTWAVE IN THE SRN BRANCH WAS OVER NE 
MEXICO MOVING E. GENERALLY FLAT MID LEVEL RIDGING COVERED THE 
MARINE AREA S OF 30N. ON THE SURFACE TONIGHT A FAIRLY QUIET 
PATTERN EXISTS WITH HIGH PRES ALONG 30N DOMINATING THE REGION. A 
WEAK COLD FRONT WAS OVER THE NE GULF MOVING SLOWLY E WITH A 1019 
MB HIGH BACK OVER LA FOLLOWING THE FRONT.

LATER DAY 1 MID LEVEL HEIGHTS CONTINUE TO FALL W OF 70W AS THE 
TWO SHORTWAVES CONTINUE EWD. THIS GIVES THE WEAK COLD FRONT JUST 
ENOUGH ENERGY TO KEEP MOVING EWD OFF THE FL E COAST. OTHERWISE 
LITTLE CHANGE. 

FOR DAY 2 A FAIRLY PROGRESSIVE PATTERN WITH THE TWO SHORTWAVES 
MERGING OFF THE SE COAST AND MOVING TO 70W. MID LEVEL RIDGING 
BEGINS TO BUILD OVER THE MID ATLC ALONG 45W AND BACK OVER THE 
SRN PLAINS. ON THE SURFACE DAY 2 THE WEAK COLD FRONT CONTINUES E 
TO NEAR 31N70W CENTRAL BAHAMAS WITH LIGHT WINDS FOLLOWING THE 
FRONT. SW WINDS TO 20 KT CONTINUE E OF THE FRONT N OF 28N. THE 
ATLC RIDGE RECEDES EWD TO THE MID ATLC BUT MAINTAINS MODERATE 
TRADES S OF 23N E OF 60W. CARIB WINDS MOSTLY 15 TO 20 KT E OF 
80W AND GULF WINDS LIGHT.

OUTLOOK PERIOD...

FOR DAY 3 WHILE MOST OF THE ENERGY WITH THE SHORTWAVES LIFTS NE 
OVER THE WRN ATLC..SOME MID LEVEL TROUGHING CONTINUES OFF THE SE 
COAST. A NEW SHORTWAVE EMERGES OUT OF THE SRN ROCKIES IN THE SRN 
BRANCH AND MOVES INTO THE SRN PLAINS. ON THE SURFACE DAY 3 THE 
OLD COLD FRONT DISSIPATES NEAR 70W WITH MOSTLY WEAK GRADIENT 
BETWEEN 60W AND 90W WITH LIGHT WINDS. RETURN SE WINDS INCREASE W 
OF 90W AS PRES FALLS OVER THE PLAINS. ELSEWHERE REMAINS ABOUT 
THE SAME. 

FOR DAY 4 MID LEVEL PATTERN PROGRESS EWD WITH THE PLAINS 
SHORTWAVE MOVING TO 95W. WEAK MID LEVEL TROUGHING CONTINUES OFF 
THE SE COAST BUT DRIFTS TO 73W. ON THE SURFACE DAY 4..THE FIRST 
OF MAY..HIGH PRES DOMINATES THE AREA WITH THE RIDGE AXIS ALONG 
30N WWD OVER THE N GULF COAST. SE WINDS OF 15 KT CONTINUE W OF 
90W. ELY TRADES S OF 22N MOSTLY MODERATE 15 TO 20 KT. 

FOR DAY 5 THE SHORTWAVE IN THE SRN BRANCH STALLS NEAR 
95W..CAUGHT BY A STRENGTHENING RIDGE IN THE NRN BRANCH OVER THE 
CENTRAL AND NRN PLAINS. WEAK MID LEVEL TROUGHING OFF THE SE 
COAST DRIFTS E TO 65W AND WEAKENS FURTHER. ON THE SURFACE DAY 5 
LITTLE CHANGE WITH THE ATLC RIDGE HOLDING ALONG 30N AND WIND 
PATTERNS REMAINING ABOUT THE SAME. 

WARNINGS...
ATLANTIC...
NONE.

CARIBBEAN...
NONE.

GULF OF MEXICO...
NONE.

FORECASTER RRG