Tropical Storm Isaac Early Evening Update Aug 21

Tropical Storm Isaac Intermediate Advisory Number 3a
Nws National Hurricane Center Miami Fl
800 Pm Ast Tue Aug 21 2012

Summary Of 800 Pm Ast...0000 Utc...Information
Location...15.5n 54.9w
About 435 Mi...700 Km E Of Guadeloupe
Maximum Sustained Winds...40 Mph...65 Km/H
Present Movement...W Or 275 Degrees At 17 Mph...28 Km/H
Minimum Central Pressure...1006 Mb...29.71 Inches

Watches And Warnings
Changes With This Advisory...


Summary Of Watches And Warnings In Effect...

A Tropical Storm Warning Is In Effect For...
* Martinique
* Dominica
* Guadeloupe And The Surrounding Islands...And St. Martin
* St. Kitts...Nevis...Antigua...Barbuda...Montserrat...And Anguilla
* Saba...St. Eustatius...And St. Maarten

A Tropical Storm Watch Is In Effect For...
* British Virgin Islands
* Puerto Rico...Vieques...Culebra...And The U.S. Virgin Islands

A Tropical Storm Warning Means That Tropical Storm Conditions Are
Expected Somewhere Within The Warning Area Within 36 Hours.

A Tropical Storm Watch Means That Tropical Storm Conditions Are
Possible Within The Watch Area...Generally Within 48 Hours.

Interests Elsewhere In Hispaniola And Cuba Should Monitor The
Progress Of Isaac.

Discussion And 48-Hour Outlook
At 800 Pm Ast...0000 Utc...The Center Of Tropical Storm Isaac Was
Located Near Latitude 15.5 North...Longitude 54.9 West.

Isaac Is Moving Toward The West Near 17 Mph...28 Km/H...And This General Motion Is Expected To Continue For The Next Couple Of Days.

On The Forecast Track...The Center Of Isaac Should Move Through The Leeward Islands Wednesday Evening...And Emerge Over The Eastern Caribbean Sea By Thursday Morning.

Maximum Sustained Winds Are Near 40 Mph...65 Km/H...With Higher
Gusts. Additional Strengthening Is Forecast During The Next 48

Tropical Storm Force Winds Extend Outward Up To 45 Miles...75 Km
To The Northeast Of The Center.

The Estimated Minimum Central Pressure Is 1006 Mb...29.71 Inches.

Hazards Affecting Land
Wind...Tropical Storm Conditions Are Expected To Reach The Warning Area By Wednesday Afternoon...Making Outside Preparations Difficult Or Dangerous. Tropical Storm Conditions Are Possible In The Watch Area By Thursday.

Rainfall...Total Rain Accumulations Of 4 To 8 Inches Are Possible
Over The Northern Windward Islands And The Leeward Islands. Total
Rain Accumulations Of 1 To 3 Inches With Maximum Amounts Of 6
Inches Are Possible Over Puerto Rico And The Virgin Islands.

Storm Surge...A Storm Surge Will Raise Water Levels By As Much As 1 To 3 Feet Above Normal Tide Levels In The Northern Leeward Islands. Near The Coast...The Surge Will Be Accompanied By Dangerous Waves.

Surf...Dangerous Surf And Rip Current Conditions Will Affect The
Windward And Leeward Islands During The Next Couple Of Days.

Next Advisory
Next Complete Advisory...1100 Pm Ast.

Forecaster Pasch

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