Effects of Synoptic Surveillance on model forecasts for
13 September 2003 1800 UTC
Isabel.
Quicktime movie of GFS DLM wind model
forecast
Quicktime movie of DLM wind data
increment
| TRACK (km) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| MODEL | 12 h | 24 h | 36 h | 48 h | 60 h | 72 h | 84 h | 96 h | 108 h | 120 h
|
| AVNN | 52. | 55. | 56. | 100. | 195. | 279. | 420. | 438. | 500. | 484.
| AVNO | 24. | 32. | 46. | 46. | 67. | 92. | 146. | 91. | 59. | 155.
| %IMP | 54% | 42% | 18% | 54% | 66% | 67% | 65% | 79% | 88% | 68%
|
| GFNO | 76. | 126. | 141. | 100. | 83. | 74. | 104. | 87. | 122. | 256.
| GFDL | 84. | 101. | 103. | 83. | 50. | 59. | 53. | 92. | 172. | 314.
| %IMP | -11% | 20% | 27% | 17% | 40% | 20% | 49% | -6% | -41% | -23%
| INTENSITY (kt)
| MODEL | 12 h | 24 h | 36 h | 48 h | 60 h | 72 h | 84 h | 96 h | 108 h | 120 h
|
| AVNN | -93. | -88. | -78. | -62. | -49. | -30. | -30. | -24. | -25. | -9.
| AVNO | -86. | -76. | -64. | -46. | -29. | -24. | -17. | -10. | -14. | -8.
| %IMP | 8% | 14% | 18% | 26% | 41% | 20% | 43% | 58% | 44% | 11%
|
| GFNO | -28. | -38. | -26. | -16. | -4. | -3. | -1. | 0. | 1. | 2.
| GFDL | -26. | -45. | -26. | -15. | -5. | -1. | -5. | -2. | -1. | 5.
| %IMP | 7% | -18% | 0% | 6% | -25% | 67% | -300% | und% | 0% | -150%
|
| SHNO |
| SHIP |
| %IMP
|
| DSNO |
| DSHP |
| %IMP
| | ||||||||||
| 18/1700 UTC 34.9N 76.2W Drum Inlet, NC 119 h into the forecast | ||||||||||||||||||||||||||||||||||||
| MODEL | LAT | LON | TIME | ERROR | LOCATION
|
| AVNN | No landfall forecast
| AVAL | No landfall forecast
| %IMP |
|
| GFNO | No landfall forecast
| GFAL | 35.84 | 73.24 | 118.00 | 287.8 | Well offshore Cape Hatteras, NC
| %IMP
| | ||||||||||||||
Figure 1. NCEP 850 - 200 hPa mean wind analysis for 13 September 2003 1800 UTC (Hurricane Isabel).
Figure 2. Track forecasts for the no dropwindsonde (NO or NN) and the all dropwindsonde (AL) runs for the AVN and GFDL models initialized on 13 September 2003 1800 UTC.
Figure 3. Initial condition differences in the 850 - 200 hPa mean wind between the no and all dropwindsonde cases for 13 September 2003 1800 UTC.
