19 June summary So far quite incomplete. One hypothesis is that a windshift line approaches the ‘dryline’ from the west (the dry side) around 20:20 UTC, and by 21:30 coincides with it, perhaps moving over the dryline, triggering deep convection on the east side. Data need to be analysed carefully to validate this - I doubt it is true. In any event, for some time the dryline and windshift line seem to be separate, straddled by times when they are coincident. And deep convection does pop up some 10 km east of the dryline.

19: :47 UTC 165 m AGL 200 m AGL fine-line and wind shift

19:44 19:47 UWKA

relative humidity mixing ratio  ee SE NW Flt level:165 m

Sudden moisture jump, gradual wind shift SE NW Flt level:165 m

Level flight: 1895 m MSL ( 880 m AGL) 20: :06 UTC wind shift ‘dryline’

SE NW relative humidity mixing ratio  ee Q: why does RH lag by ~4 sec? Compared to Mrlaf, it seems to be damped. Theta-e should use the more accurate value

SE NW vertical velocity mixing ratio wind direction wind speed

height AGL (m) UWKA flight level (~880 m) wind direction mixing ratio  ee SE NW 4 m/s2 m/s 11 km 19 June

20: :25 UTC Level flight: 2700 m MSL ( 1700 m AGL) wind shift fine line below ‘dryline’

relative humidity mixing ratio  ee SE NW buoyant plume! 4 km displacement?? (plume on the dry side!) dryline windshift line

21:03 UTC

21: :25 UTC Level flight: 1280 m MSL ( 300 m AGL) wind shift ‘dryline’

relative humidity mixing ratio  ee SE NW buoyant plume! 1.5 km displacement plume on the dry side

21: :36 UTC Level flight: 1730 m MSL ( 745 m AGL) wind shift ‘dryline’

19:47 19:43 UWKA Convection pops up on the moist side, some km east of the fine line

height AGL (m) UWKA flight level (~745 m) wind direction mixing ratio  ee 11 km 19 June Signal overwhelmed by rainfall at 21:36:40 w SENW

height AGL (m) UWKA flight level (~745 m) wind direction mixing ratio ee 13.6 km 19 June Signal overwhelmed by rain drops SENW  w RH