1. Atmospheric Gravity Wave Event
LT Brad G Harris

2. Outline
Ships observations.
Other observations
Comparison study

3. Ship Data
Quick Obs:
00-11Z: Visibility at 20km. Sky conditions unchanged.
12Z: Visibility at 20km. Sky conditions unchanged. “Quick squall.
Winds up to 25 knots in last hour”
13Z: Visibility decreased to 4km.

4. NCEP: 2004 FEB 02 12Z Surface Analysis

5. Other Surface Observations

16. Santa Cruz
1100
MBARI Mooring M1
1120
Chowchilla
1200
Fort Ord
1140
Granite Canyon
1130
MBARI Mooring M2
1100
Pt Sur
1130
Pt Piedras Blancas
1145
Paso Robles
1230
Wave Dir
Phase Speed = 16m/s
Wave Length = 24km
Santa Maria
1200

21. GOES-10 IR 1100Z

22. GOES-10 IR 1200Z

23. Comparison Study
Looked at three articles involving comparison studies.

24. Common Features Wave packets or less common singular wave
Jet streak role not fully understood but gravity wave usually exist in exit region
High precipitation rates
Strong low level inversion below neutrally buoyant layer: Inversion not present in this case but do have neutrally buoyant atmosphere.

27. Questions?