Tropical Depression Seven may form today
Posted by: JeffMasters, 9:34 AM EDT on September 07, 2007 |
An area of disturbed weather
(99L) that formed along an old frontal boundary has grown much better organized over the past six hours, thanks to an decrease in wind shear. Strong upper level winds from the southwest are still creating about
15-20 knots of wind shear over 99L, but
satellite loops of 99L show that a more organized circulation has formed, with heavy thunderstorm activity starting to build north of the center. The GFS-based SHIPS model is predicting wind shear will fall to 5 knots on Saturday over 99L, and this should allow the storm to organize into a tropical storm by Saturday. The storm may have time to intensify into a Category 1 hurricane before it makes landfall Sunday night in South Carolina or North Carolina, as predicted by the latest run of the GFDL model. However, the SHIPS intensity model and the HWRF models are calling for a tropical storm and tropical depression, respectively, at landfall. My best guess is that this will be a 60-65 mph tropical storm at landfall, but there is a very high amount of uncertainty with this forecast. The storm is then expected to track northward and then northeastward along the coast, bringing heavy rains and high winds to the mid-Atlantic and New England areas on Monday and Tuesday.
The Models the Night Before... finally lot's of similar tracks lining up.
-------------------------------------------------------
SURF SWELL PERIOD WIND WND/DIR
(ft) (ft) (sec) (kts) (deg)
------- -------- ----- ------ --------
9/8 8am 2-5 ESE 109 5.5 8.3 12-16 ENE 77
9/8 2pm 3-6 ESE 113 6.1 8.2 14-19 ENE 71
9/9 8am 3-7 ESE 119 7.9 7.5 16-21 ESE 116
9/9 2pm 2-5 ESE 120 7.0 7.1 13-18 SE 145
9/10 8am 1-3 SSE 157 4.9 6.8 10-14 W 266
9/10 2pm 1-3 S 175 4.0 6.3 7-9 WSW 244
9/11 8am 1-2 SW 216 4.2 5.2 14-19 WSW 249
9/11 2pm 1-2 SW 213 3.5 5.1 12-17 SW 220
9/12 8am 1-2 SSW 207 3.6 5.1 9-13 WSW 242
9/12 2pm 1-2 SSW 205 3.7 5.0 13-18 SW 219
9/13 8am 1-2 SSW 206 3.6 4.8 7-9 WSW 251
9/13 2pm 0-1 SSW 202 3.1 4.7 5-7 SSW 198
9/14 8am 1-2 ESE 106 2.8 8.5 8-11 SSE 158
9/14 2pm 0-1 SSE 168 3.7 4.2 13-17 S 176