19 June summary
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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.
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19 June summary. - PowerPoint PPT Presentation
Transcript of 19 June summary
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.
19:44 - 19:47 UTC
165 m AGL
200 m AGL
fine-line and wind shift
19:44
19:47
UWKA
relative humiditymixing
ratio
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)
20:03 - 20:06 UTC
wind shift
‘dryline’
SE NW
relative humidity
mixing ratio
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 directionwind speed
0
500
1000
1500
2000
height AGL (m)
UWKA flight level (~880 m)
wind direction
mixing ratio
e
SE NW
4 m/s2 m/s 2 m/s
11 km
19 June
20:21 - 20:25 UTC
Level flight: 2700 m MSL( 1700 m AGL)
wind shift
fine line below
‘dryline’
relative humidity
mixing ratio
e
SE NW
buoyant plume!
4 km displacement??(plume on the dry side!)
drylinewindshift
line
21:03 UTC
21:22 - 21:25 UTC
Level flight: 1280 m MSL( 300 m AGL)
wind shift
‘dryline’
relative humidity
mixing ratio
e
SENW
buoyant plume!
1.5 km displacementplume on the dry side
21:33 - 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 10-15 km east of the fine line
0
500
1000
1500
2000
height AGL (m)
UWKA flight level (~745 m)
wind direction
mixing ratio
e
11 km
19 June
Signal overwhelmed byrainfall at 21:36:40
w
SENW
0
1000
2000height AGL (m)
UWKA flight level (~745 m)
wind direction
mixing ratio
e
13.6 km
19 June
Signal overwhelmed by rain drops
SENW
w
RH
