This is probably why...
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
200 PM EDT SAT JUL 18 2009
FOR THE NORTH ATLANTIC...CARIBBEAN SEA AND THE GULF OF MEXICO...
1. A TROPICAL WAVE LOCATED NEAR THE LESSER ANTILLES IS PRODUCING NUMEROUS SHOWERS AND THUNDERSTORMS AS IT INTERACTS WITH AN UPPER-LEVEL TROUGH. WHILE RAINFALL ASSOCIATED WITH THE WAVE MAY BE LOCALLY HEAVY AT TIMES...UPPER-LEVEL WINDS ARE NOT CURRENTLY CONDUCIVE FOR SIGNIFICANT DEVELOPMENT OF THE SYSTEM AS IT MOVES WEST-NORTHWESTWARD AT AROUND 15 MPH. THERE IS A LOW CHANCE...LESS THAN 30 PERCENT...OF THIS SYSTEM BECOMING A TROPICAL CYCLONE DURING THE NEXT 48 HOURS.
2. A TROPICAL WAVE LOCATED ABOUT 1000 MILES EAST OF THE WINDWARD ISLANDS CONTINUES TO PRODUCE DISORGANIZED SHOWER ACTIVITY. ANY DEVELOPMENT OF THIS SYSTEM WILL BE SLOW TO OCCUR AS IT MOVES WESTWARD AT AROUND 20 MPH. THERE IS A LOW CHANCE...LESS THAN 30 PERCENT...OF THIS SYSTEM BECOMING A TROPICAL CYCLONE DURING THE NEXT 48 HOURS.
ELSEWHERE...TROPICAL CYCLONE FORMATION IS NOT EXPECTED DURING THE NEXT 48 HOURS.
And So It Goes.... it's summertime...