date | name | report | remarks |
2020-01-18 |
HALO-0118 |
|
- Transfer from EDMO to LEST
|
2020-01-19 |
HALO-0119 |
report |
- Transfer from LEST to TBPB
|
2020-01-22 |
HALO-0122 |
report |
- Basic pattern of circles, spur towards NTAS removed in favour of calibration maneuvers.
- Square pattern for BACCARDI calibration at FL410 (above Cirrus), with return leg at FL310 (below Cirrus).
- Very moist and deep trade-wind layer, convection extending to 4 km associated with a Fish pattern in the SW-edge of the circle.
- Descending Cirrus (9-13.5km) coming from West and South of the circle.
- Away from the southwest edge of the track the air was almost entirely cloud free.
|
2020-01-24 |
HALO-0124 |
report |
- Circle pattern, in the end excursion towards NTAS.
- Deeper convection in the SE circle, spreading cold pools and stratiform clouds.
|
2020-01-26 |
HALO-0126 |
report |
- Super curtain with Twin Otter and ATR after takeoff.
- Four coordinated straight legs over Meteor.
- Cirrus clouds in 14-17 km present for almost full flight.
|
2020-01-28 |
HALO-0128 |
report |
- Rather long excursion towards NTAS with radar calibration maneuver.
- Sugar cloud patterns within the circle.
|
2020-01-30 |
HALO-0130 |
report |
- Short flight duration of about 3 hours and 48 minutes.
- Joint race track pattern with ATR.
- GPM satellite underpass.
- Straight leg above saharan dust layer.
|
2020-01-31 |
HALO-0131 |
report |
- Persistent shallow dust layer, more intense towards the south, accompanied there by shallow cumuli.
- 1st set of circles: Fading flower.
- 2nd set of circles: Malnourished spine of a fish.
- Excursion: Partly successful with the 10deg bank (or 540deg heading) manoeuvre.
- The Flo-manoeuvre (wiggle) failed as the radar stopped right before it.
|
2020-02-02 |
HALO-0202 |
report |
- Flying seven standard circle patterns (six circles with dropsondes).
- Flying the novel clover pattern as excursion. Convection and clouds were organized as flowers moving mostly eastwards with a slight component to the North.
- Essentially, we tracked three to four flowers.
|
2020-02-05 |
HALO-0205 |
report |
- Two standard 3.5 circle patterns. In between an excursion leg to NTAS and a leg with satellite (Terra/MISR ) overpass.
- At the beginning mostly flower pattern. Changed to gravel/sugar later on.
- Higher cloud fraction than on previous days.
- Well developed clouds with showers in some of them.
|
2020-02-07 |
HALO-0207 |
report |
- Two standard circle patterns with an excursion to NTAS plus radar calibration manoveur.
- 1st set of circles dominated by flower pattern with stratiform layers at ~2km.
- Many large cold pools with remnants of stratiform clouds in the middle.
- 2nd set of circles dominated by sugar/gravel pattern.
|
2020-02-09 |
HALO-0209 |
report |
- Two standard circle sets with an excursion to NTAS.
- Radar calibration maneuver (20-deg-wiggles and 10-deg-circle) at NTAS.
- Flyovers over the Ron Brown towards and backwards from NTAS.
- At the 1st Ron Brown flyover a dropsonde was launched.
- Mostly shallow sugar clouds during the flight.
- Two cold pools entered the circle during the 2nd circle set.
|
2020-02-11 |
HALO-0211 |
report |
- Standard circle pattern with 5 complete circles.
- GPM-satellite overpass on the way back from NTAS (20:27 UTC).
- Radar-calibration maneuver around NTAS (20-deg-wiggles and 10-deg-circle).
- An additional sonde was launched near NTAS after the calibration maneuver.
- Western circle area was dominated by convection with strong precipitation signals and stratocumulus on top.
- Rest of circle mostly occupied by small sugar cumuli.
- The excursion legs were characterized by larger flower-like cloud clusters growing on a sugar cloud field.
|
2020-02-13 |
HALO-0213 |
report |
- Two standard circle sets (each 3 circles) with excursion to NTAS in between.
- Radar calibration maneuver (20deg wiggle) flown at NTAS location.
- At the beginning of the flight the circle area was dominated by a flower cloud pattern with stratiform layers at ~2km.
- During the flight the flower pattern collapsed slowly into a fish pattern.
- During the whole flight precipitating cells were observed.
- On the way to NTAS a few cold pools were observed with shallow sugar-type convection.
|
2020-02-15 |
HALO-0215 |
report |
- First two circles near Barbados. Excursion to NTAS. Third circle at NTAS location.Last three circles again near Barbados.
- Fewer dropsondes launched than usual because of the availibility at this stage of the campaign.
- **Only one dropsonde during circle 5!**
- Thick and persistent altostratus layer (top at ~9km) covering the area from Barbados to NTAS.
- Beneath the altostratus layer shallow clouds and stratiform layers were present.
- Flight went above and below the altostratus layer.
- **See flight-report for more information.**
|
2020-02-18 |
HALO-0218 |
|
- Transfer from TBPB to EDMO
|