ST MEETING 17 July, Forecast for 18 July - DOY 199

Dear Trish. ST meetings are getting interesting, now that conditions
turn right and we all want to do
everything. As you'll see from the ST report below, the ClearLAG for
tomorrow (Fri) is called OFF. So ship should go to
near Sagres for participating in CLEARCOLUMN tomorrow . PLEASE SEND US A
MAIL BY 0600Z Fri, WITH YOUR POSITION AT AROUND 1200Z Fri. A close
position SSW (= downwind of Sagres) would be OK. Frank

ST meeting 0717  Thursday

Meteo Outlook

DAY N+1. 
Upper levels: ridge line from E Azores to Iceland moving slowly E
and bringing subsidence over the area; cold low NE of France moving E.
NW and W winds. Low levels: elongated anticyclone extending from S
Azores to N of British Isles, somewhat reinforcing and extending more
eastward over W Europe; low W of France moving slowly E; thermal low
over N Africa. NE and N winds 12-16 Kt over ocean, weak variable over
Portugal and costal areas. MBL-depth around 1100 m over ocean, Madeira
and Canaries, steady. Clear skies expected around Portuguese coast,
Sagres, Cadiz Gulf and NW Africa coast, increasing toward SW to broken
layers of Sc reaching Madeira and N Canaries. Anthropogenic air expected
both in the MBL and FT over NE part of the area, including W coast of
Portugal and Sagres, moving SW toward Canaries; dust is not excluded in
this area since some trajectories come from zones where dust is present
(N Africa and surroundings). Over Tenerife, anthropogenic air expected
below 800 mb, advected from Iberian Peninsula, and clean air above. 
DAY N+2. 
Similar patterns than N+1: the high extends more E affecting W
Europe and favouring the outbreak of polluted air. Stronger winds at
surface 18 Kts over ocean, still weak variable over Portugal.
Anthropogenic air expected both in MBL and FT around SW Portuguese coast
and Sagres moving toward Canaries. Over Tenerife, still anthropogenic
air below 800 mb, perhaps mixed with some dust, and clean above.  
DAY N+3.
All patterns v. similar to day N+2. On day N+4, itīs possible that
a weak trough moving E crosses the ACE-2 area aloft; then a low tends to
form over the Iberian Peninsula, and the anticyclone tends to reinforce
over Azores, and to move somewhat W. Polluted air is still expected over
NE part of ACE-2 area. Cloud pattern and MBL-depth wonīt vary
significatly.

Today Thursday
1. Full LAGRANGIAN 1st and 2nd flight with C130. Balloons behaving as
predicted
Air mass is definitely polluted. MBL decoupled during the day.  Start
3rd flight at 2100Z 
2. CLEARCOLUMN Pelican flight in dust,  in coordination with IZO
3. CLOUDYCOLUMN with Merlin and Dornier  supported by C130 and Pelican
4. HILLCLOUD run last night in slightly polluted conditions

Friday
5. Pelican to make 4th LAGRANGIAN flight
6. 0630Z GONOGO for CLEARCOLUMN over Sagres with C130
7. 0800Z GONOGO for CLOUDYCOLUMN (with C130 in case NOGO for CLEARCOL.)
8. Citation early morning flight and afternoon flight
9. C130 to start 5th LAGRANGIAN flight at 2100Z 

Saturday.
9. CLEARCOLUMN or CLOUDYCOLUMN with C130 (depending on Friday's
decisions)

Sunday
10. Clear LAGRANGIAN near Sagres with C130 and ship. Can be followed by
a full LAGRANGIAN
if conditions are right

Monday
11. Favorable conditions for starting Full LAGRANGIAN possibly till
0900Z.

General
- Jean Louis' presentation scheduled for Friday.