Tropical Storm Allison formed in the western Gulf of Mexico on June 5, 2001. The storm system then moved inland over Texas and Louisiana slowly meandering eastward. Allison moved into the Atlantic near the North Carolina - Virginia Coast and continued to spread precipitation to the Northeast. After fourteen days of drenching rains, flooding, and wind damage, Allison became the most costly tropical system to affect the Unitied States to date.
 Full Size Next Generation Auto Estimator Scale represents 0 to 20 inches |
 Full Size Rain Gauge Observations Scale represents 0 to 20 inches |
 Full Size Operational Auto Estimator Scale represents 0 to 20 inches |
Infrared Loop - June 5. |
Visible Loop - June 5. |