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19 June summary

19 June summary.

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19 June summary

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  1. 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.

  2. 19:44 - 19:47 UTC fine-line and wind shift 200 m AGL 165 m AGL

  3. UWKA 19:47 19:44

  4. NW SE relative humidity mixing ratio Flt level:165 m q qe

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

  6. 20:03 - 20:06 UTC Level flight: 1895 m MSL ( 880 m AGL) ‘dryline’ wind shift

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

  8. NW SE vertical velocity mixing ratio wind speed wind direction

  9. height AGL (m) 19 June 2000 1500 2 m/s 4 m/s 2 m/s 1000 UWKA flight level (~880 m) 500 0 SE NW wind direction mixing ratio q qe 11 km

  10. 20:21 - 20:25 UTC Level flight: 2700 m MSL ( 1700 m AGL) fine line below ‘dryline’ wind shift

  11. windshift line dryline NW SE 4 km displacement?? (plume on the dry side!) relative humidity mixing ratio buoyant plume! q qe

  12. 21:03 UTC

  13. 21:22 - 21:25 UTC Level flight: 1280 m MSL ( 300 m AGL) ‘dryline’ wind shift

  14. SE NW 1.5 km displacement plume on the dry side mixing ratio relative humidity buoyant plume! qe q

  15. 21:33 - 21:36 UTC Level flight: 1730 m MSL ( 745 m AGL) ‘dryline’ wind shift

  16. UWKA 19:43 19:47 Convection pops up on the moist side, some 10-15 km east of the fine line

  17. height AGL (m) 19 June 2000 1500 1000 UWKA flight level (~745 m) 500 Signal overwhelmed by rainfall at 21:36:40 0 NW SE mixing ratio wind direction 11 km qe q w

  18. height AGL (m) 2000 1000 UWKA flight level (~745 m) 0 Signal overwhelmed by rain drops NW wind direction mixing ratio SE 13.6 km qe q RH w 19 June

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