Download - £ttttflM*≪*K#5 m$momk%;!k mnmm · 2014. 8. 26. · LS^iillO-tt-e^ O^r^b, RliUft: O^ttKi^ 3. ≪£L3H±-
1
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Occurrence of Linearly Ranged Cb-clouds Associated with
Migrating Band-shaped Cirriform-clouds
―A Case Study―
£ * m %.*
Kazufumi Suzuki*
Abstract
In the midsummer, linearly ranged Cb-clouds along the southern coast of Japan were
often observed in the southwestern leading edge of migrating band-shaped cirriform-clouds.
These phenomena (rapidly moving band-shaped cirriform-clouds) are usually related to
subsynoptic-scale upper troughs with a weak cold air mass.
It is difficult to find out such a weak sub-synoptic-scale upper trough from the con-
ventional data only, however, by tracing the band-shaped cirriform-clouds on the satellite
pictures, we can detect such kind of the trough easily.
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Shimamura (1981) ^>^K (1981) Kil^i, fSi^ffi
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1 ―
METEOROLOGICAL SATELLITE CENTER TECHNICAL NOTE No. 11. MARCH 1985
Fie. 1 0600Z AUG 6 1984. IR
Fig. 2 0600Z AUG 4 1984. IR
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Fig. 3 Surface charts. Left and right charts
show 06Z 7 Aug. and 06Z 8 Aug. 1984, res-
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Table 1 SSI (left column) and equivalent
potential temperature of 850 mb (right
column) at Akita (47582), Sendai (47590),
Tateno (47646), Hachijo (47678), Wajima
(47600) and Shionomisaki (47778).
47512 175VO tiHt ・ 7*71 ・ 7400 ≫777≫
7 0017 }}3 33) 1 30) 10 122 4 331 332
7 Ui 33* 1 3≪6 -1 352 5 333 2 3*1 0 J≫≪
≫ ooi 3 J≫7 32≪ 0 3≪7 1 }≪ i 333 T 329
* III 1 JJ7 -2 349 -1 349 0 )≪) 03≪0 -2 352
≫ oar 0J39 2 JJ≪ 0 3≪2 0 3*2 2 JJ7 0 )≪≪
1 121 2 itl0 342 -1 M4 1 3≪≪ -1 )4≪ -2 350
10 0015 113 5 33≪ 1 340 1 311 * 3)2 -1 J<≪
10 121 11 32≪ 3 U9 1 ≫≪ 3 13J 10 326 -1 341
― 3 ―
METEOROLOGICAL SATELLITE CENTER TECHNICAL NOTE No. 11. MARCH 1985
Fig. 4 0600Z AUG 7 1984. IR
Fig. 5 1200Z AL'G 7 1984. IR
xt%ffiM-t>\*~ KMf-i ^ll'J 1985^- 3 n
Fie. 6 OOOOZ AUCi 8 1984. IR
Fig. 7 0600Z AUC. 8 1984. IR
― .) ―
METEOROLOGICAL SATELLITE CENTER TECHNICAL NOTE No. 11. MARCH 1985
Fig. 8 1200Z AUG 8 1984. IR.
Fig. 9 Digital radar echo composite maps.
6 ―
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Table 1 it, &i&&<D SSI (■>^* a-* - c £5gJF
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Fig. 10 upper; 300mb charts. Thin solid lines show isotherms of ―30°C. Solid
lines named C indicate trough axis, lower; 500mb charts. Broken lines show iso-
therms of ―6°C. The stippled areas represent the temperature descent more than
1°C in preceding 12 hours.
― 7 ―
METEOROLOGICAL SATELLITE CENTER TECHNICAL NOTE No. 11. MARCH 1985
Tateno
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Fig. 11 Vertical wind cross sections at Akita, Tateno and Hachijo. Thin solid lines
show isolines of T-Td drawn at intervals of 6°C. The stippled areas show T-Td
less than 6°C. Thick solid lines indicate upper sub-synoptic-scale throughs.
Fig. 12 Vorticity and geopotential height at 500 mb. Positive
vorticities are stippled. The letters "A" and "B" denote the
centers of the temperature descent areas more than 1°C in pre-
ceding 12 hours (reffer to Fig. 10).
- 8 ―
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m m
Shimamura, M., 1981: The Upper-Tropospheric Cold
Lows io the Northwestern Pacific as Revealed in
the GMS Satellite Data, The Geophy. Mag., 39,
119-156.
'NR^gp, i98i: i&&mfrb*&m^mA-t%-k-*m
9, 3z%, 28, 57-60.
iEMffi, ^%, 31, 421-424.
Kttmm, 1984: ffiM.mm-tr*m$mKUtcftm*m~r
zm. %%wiM.mM%, m^^r, 11-26.
9 ―