Effects of Synoptic Surveillance on model forecasts for
08 July 2005 1200 UTC
Dennis.
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 | 35 | 56 | 30 | 49 | 102 | 151 | 290 | 435 | 599 | 741
| AVNO | 75 | 151 | 112 | 88 | 22 | 48 | 152 | 263 | 207 | 167
| %IMP | -114% | -170% | -273% | -80% | 78% | 76% | 48% | 40% | 65% | 77%
|
| GFNO | 24 | 56 | 87 | 91 | 33 | 68 | 142 | 279 | 414 | 586
| GFDL | 23 | 46 | 35 | 35 | 19 | 86 | 169 | 256 | 373 | 447
| %IMP | 4% | 18% | 60% | 62% | 42% | -26% | -19% | 8% | 10% | 24%
|
| INTENSITY (kt)
| MODEL | 12 h | 24 h | 36 h | 48 h | 60 h | 72 h | 84 h | 96 h | 108 h | 120 h
|
| AVNN | -56 | -35 | -69 | -71 | -6 | -5 | -5 | -4 | -6 | -7
| AVNO | -55 | -29 | -64 | -69 | -15 | -5 | -5 | -1 | -6 | -8
| %IMP | 2% | 17% | 7% | 3% | -150% | 0% | 0% | 75% | 0% | -14%
|
| GFNO | -3 | 26 | 0 | -24 | 10 | -6 | 0 | -1 | 4 | 0
| GFDL | -16 | 24 | -12 | -29 | 13 | -5 | 1 | -1 | 3 | -2
| %imp | -433% | 8% | und% | -21% | -30% | 17% | und% | 0% | 25% | und%
|
| | ||||||||||
| 08/1845 UTC 22.1N 80.7W just west of Punta Mangles Altos, Cuba, 6.75 h into the forecast | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| MODEL | LAT | LON | TIME | ERROR | LOCATION
|
| AVNN | 22.01 | 80.64 | 6.5 | 11.8 | Cienfuegos, Cienfuegos, Cuba
| AVNO | 22.05 | 80.43 | 8.0 | 28.3 | Cienfuegos, Cienfuegos, Cuba
| %IMP | -400% | -140%
|
| GFNO | 22.08 | 80.57 | 7.0 | 13.6 | Cienfuegos, Cienfuegos, Cuba
| GFDL | 22.08 | 80.91 | 9.0 | 21.7 | Cienfuegos, Cienfuegos, Cuba
| %IMP | -1000% | -60%
|
|
10/1930 UTC 30.4N 87.1W Santa Rosa Island, FL, 55.5 h into the forecast
| MODEL | LAT | LON | TIME | ERROR | LOCATION
|
| AVNN | 30.60 | 87.90 | 60.0 | 79.7 | Mobile, AL
| AVNO | 30.41 | 86.67 | 55.0 | 41.2 | Fort Walton Beach, FL
| %IMP | 89% | 48%
|
| GFNO | 30.36 | 86.74 | 53.0 | 34.8 | Fort Walton Beach, FL
| GFDL | 30.40 | 87.23 | 55.0 | 12.5 | Pensacola, FL
| %IMP | 80% | 64%
| | |||||||||||||
Figure 1. NCEP 850 - 200 hPa mean wind analysis for 08 July 2005 1200 UTC (Hurricane Dennis).
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 08 July 2005 1200 UTC.
Figure 3. Initial condition differences in the 850 - 200 hPa mean wind between the no and all dropwindsonde cases for 08 July 2005 1200 UTC.
