Effects of Synoptic Surveillance on model forecasts for
12 September 2005 0000 UTC
Ophelia.
Quicktime movie of AVN 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 | 11 | 67 | 103 | 120 | 99 | 199 | 292 | 513 | 721 | 875
| AVNO | 22 | 67 | 76 | 115 | 143 | 240 | 438 | 884 | 1256 | 1420
| %IMP | -100% | 0% | 26% | 4% | -41% | -44% | -50% | -72% | -74% | -62%
|
| GFNO | 33 | 58 | 52 | 48 | 52 | 134 | 197 | 247 | 325 | 416
| GFDL | 29 | 85 | 94 | 82 | 82 | 147 | 233 | 426 | 687 | 905
| %IMP | 12% | -47% | -81% | -78% | -58% | -10% | -18% | -72% | -114% | -118%
| INTENSITY (kt)
| MODEL | 12 h | 24 h | 36 h | 48 h | 60 h | 72 h | 84 h | 96 h | 108 h | 120 h
|
| AVNN | 4 | 11 | 3 | 3 | -16 | -22 | -18 | -16 | -10 | -15
| AVNO | -2 | -2 | 1 | 6 | -12 | -25 | -15 | -10 | 1 | -13
| %IMP | 50% | 82% | 67% | -100% | 25% | -10% | 17% | 37% | 90% | 13%
|
| GFNO | 16 | 8 | 2 | 5 | -9 | -19 | -16 | -11 | 3 | -14
| GFDL | 14 | 3 | 4 | 1 | -17 | -17 | -10 | -6 | -7 | -13
| %IMP | 12% | 62% | -100% | 80% | -89% | 11% | 37% | 46% | -133% | 7%
| | ||||||||||
Figure 1. NCEP 850 - 200 hPa mean wind analysis for 12 September 2005 0000 UTC (Tropical Storm Ophelia).
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 12 September 2005 0000 UTC.
Figure 3. NCEP Global Ensemble Prediction System track forecasts for all cyclones in the Atlantic basin initialized from 10 September 2005 0600 UTC to 11 September 2005 0000 UTC, showing the tracks of Tropical Storm Ophelia.
Figure 4. Ensemble perturbation variance at the nominal sampling time 12 September 2005 0000 UTC from the previous day NCEP ensemble forecast. The green circles represent the dropwindsonde locations.
Figure 5. Variance explained within the verification region (large red circle) for observations taken at the sampling time 12 September 2005 0000 UTC from the Ensemble Transform Kalman Filter run from the previous day NCEP ensemble forecast. The green circles represent the dropwindsonde locations.
Figure 6. Adjoint-Derived Steering Sensitivity Vector for observations taken at the sampling time 12 September 2005 0000 UTC. The green circles represent the dropwindsonde locations.
Figure 7. NOGAPS Singular Vector for observations taken at the sampling time 12 September 2005 0000 UTC. The green circles represent the dropwindsonde locations.
Figure 8. Initial condition differences in the 850 - 200 hPa mean wind between the no and all dropwindsonde cases for 12 September 2005 0000 UTC. The circles represent the dropwindsonde locations.
