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   Encounter Incidents of Aircrafts with Ash Clouds from the
Miyakejima Eruptions on August +2, ,***
Yoshihiro SAWADA
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World Meteorological Organization, r ¢£st? 6¤gu

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]  p ^248

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VAAC (Anchorage, Darwin, Washington) 

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2+2 



1 VAAC 23'24 53 !4"#67589!:;<=>?/.
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On4M¥25P23 Rossier (,**,), Tupper et*al. (,**.a, ,**.b), Gu#anti et al. (,**.), Onodera (,**.)

CD<E%& / Q2Z0 Gu#anti et al. (,**.) ¦%z{3FGHG IJ 2 ? VAAC < ,. IJ+,E%&KL670 VAA 3 FMN*

Tupper et al. (,**.b) *§R-./0¨P2!S©z{3S©ªT<

TUGV;*^«¬­U®4Z4 V675S©<W¯X-

SIGMET < ARMAD /T'W25*X!S©-53 / 2Z0 

XMY2Z0!S©^«°S© A, B, C, D `± ¨P2z

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teorological Advisory) 3B\)2Z 

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+0  ++ H01 / . *3+0 UTC 'S'T*U%< 1( 
/ %.*U +. :-ῌ, 

 
V +

 !" 1.1 # $%&  C : 1.1 

B/20 +, -./.+01(. (Tupper et al., ,**.
b) *3-* UTC 2
** 

3

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8 . 9  , : 5 3 km 6
;%< => ?@ - A BC
 DC!" #$(Tupper et al., ,**.a) O*%Onodera (,**.)  3

/** (MN

6

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B/20 

*X*

+

A--1

f.TU :wt

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+,Z }~5z\'6[K ;J'Y- S'"'KL. ,** (MN (Tupper
et al., ,**.a, b)

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Z  - [K' (Tupper et al., ,**.a) 6

T*U*  VWX  A" ,1* km 4 --  /.

Y a   \J1 6 - B : 1-1ῌ2** <

6W 3, km P)J1(  + EP3

, +.,  *3  6 .   - G , -1( (Y .a!"EF . A% ?@

+ +** GH: EFI&J 'KL+,-/ UTC 2

 A .TU*3-* UTC, :  B .TU1( Onodera, ,**.

 A : 1.1 '()*

RD.*U 1  +2 

Q *2,. UTC
 A D

Tupper et al. (,**.b)

249



*3-*

*3** UTC 2 3¡].'(Z  J
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A--1 

> T

 E : DC-+* 

5 ++ km ]OY (Tupper

et al., ,**.b) +,^.QS_['("` 6 ^o *, -1( (Tupper et al., ,**.b)
^J1('(. *2/* UTC 2

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2:ῌ':; '.B/o - .

<='>_?

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=>

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6. *3 UTC 2c *2-, UTC

TU}

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de

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6o 

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(Rossier, ,**,). Tupper et al. (,**.b)6 E! *B/20

 G

  1. km+,

-17a ATC Air Tra$c Control, *%E*/NG 3HZ+0 km Y  ¨*%+.

NOAAῌAVHRR®17a TERRAῌMODISO ¯l6«g*UGHj

n.3kY
GMS °m.?n

Y (Tupper et al. ,**.a)
,

GMS o±°m (IR+)

 2 ¦ +2 O

6 \HZ *%  QS'YJ

pq² *2-, UTC ³6

1( Tupper et al. (,**.a, b)  6 G\ *3-, UTC ´> Tµ.Y I.c Onodera (,**.)

6 G *3-, UTC, JK A GLM  + EP1(
 A, B

*3-, UTC

6 r&

a

"!

 +  A, B, EP

,   6LM.77 ¶' NG 3" 8_·.>s Tt1 " *U "  :

NO *% *Pc  A B

uvhw.¸Y1( x\¹d: yz
LM#º'w» S6 5

Y1¼'"! \F 4 < G

250

9 , ,*** C 2 ¶ +2 V  GMS/ ¦./*+ (IR+) , 
8D·; !"# $%&' (,**-) ¸E ¹º      
!"#

$%&'

()   *2-, UTC  GMS *+,-

 ./*+, 01234

5*+-* UTC%m ,1  n +.0 &op,,}

. : $B 2^3 km, OP7  1d65 7 89 , :; <=*+,>?" +2  ,,** UTC7  @AB +. km ,C ,q3 *3-, UTC{| +3 EBzwlLd"7(,**-)

9 - ef . c! d"n8+^. L&7 »; AB ij A  B, C  D i
j C  D (@¼=L@*Tupper et al. (,**.a)  Fig. / ¸E ¹º 01DE

%m -.  n +.. &op

 FE

 89 , G; @AB +/ km ,CHI/ J KBBLM7  @N  

~E,K-.E5  E/07 7

01OP7 EQ7 01  @R  +.-, UTCS HI  +.-, UTC *+

W ! o7  , , k12 kE 
ij7%%k S13Lh,**.) Y

TUVWX 1

35WX*  * +, 7 Z[ 0W\*]   @N ,*-, UTC *+,



U6Lp

01 +3  *,-, UTC *+, ^_0Tupper et al. (,**.a)  GMS *+ ( . c
89 -  +^. 9 AB, C, D

 - g h4ij A  B, ij C, ij D k,d" +2  +2-* UTC^ _01 3 mῌs

%m -+  n +-3 &

op,q3 ' %m ,3  n+-3 &op,q3 ' 



~



 YXv#rW  VAAC WX GMS *+7

3 B: 9 E@9# 7;*4  W X +- ) N

 VAA + E¡¢¡

 @N PIREP £ ¤5 B£¥E@#  ,¦7 *2.* UTC p, *4 ATC ]<§=74¨ ©L>4Qk 

, : A rstu'vL$B /^2 km, .

mῌs , 1d" +3  +.-* UTC

N ,2 

VAA, SIGMET, ARMAD @*

ARMAD+, SIGMET+ E* (@ij#; ;+ : $B +/ km Hl

4# E

8rs + 8;   a  OP9

1 `aE b (Onodera,7 VAAC  84;   E  Y FHI*+! d"Lef7- : $B 3^++ km,  ,/ mῌs ,7

B/20 WX©1ª? ««p,1¬­@AL®  Yn B-¯Q,C N,C°kE±²³5-´701d" Bw (x ()EC E (*+y4 (Onodera, ,**.) 7W7 @  EDEµµYn 1d"7¡, kE ij77

,***  2  +2 ./012 345

 + ,***  2  +2  VAA, SIGMET, ARMAD 
    ! UTC. Tupper et al. (,**.a), Onodera (,**.), "#$%&'()*+,-251¶ `  ·

252



yz#  * +{ & 

Tupper et al. (,**.a, ,**.b)      SIGMETBC ).=!

 VAA   !" PIREP

#$

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% &' VAA- ()# ATC* +,  -# .)#  /012()# /345678 !  g #$J
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   Gu#anti, M., Casadevall, T. J. and Mayberry, G. C. (,**.)
Reducing encounters of aircraft with volcanic-ash
clouds. In Proceedings of The ,nd International Conference
on Volcanic Ash and Aviation Safety, Session+-Page +1ῌ
,+, OFCM (O$ce of The Federal Coordinator for Meteorological Services and Supporting Research).
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-2,ῌ-3,.
f (,**.) ' ( k¹µr.] , tj¶^xv· ' ! .3! -2-ῌ-21.
Onodera, S. (,**.) Prevention of volcanic ash encountersin the proximity area between active volcanoes and heavy
air tra$c routes. In Proceedings of The ,nd International
Conference on Volcanic Ash and Aviation Safety, Session/-Page ,+ῌ,/, OFCM.
Rossier, R. N. (,**,) Volcanic ash : avoid at all cost. Business & Commercial Aviation, February ,**,, 1*ῌ1/.
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CD-ROM ¼
Tupper, A., Carn, S., Davey, J., Kamada, Y., Potts, R.,
Prata, F. and Tokuno, M. (,**.a) An evaluation of
volcanic cloud detection techniques during recent signiﬁcant eruptions in the western “Ring of Fire”. Remote
Sensing of Environment, 3+, ,1ῌ.0.
Tupper, A., Kamada, Y., Todo, N. and Miller, E. (,**.b)
Aircraft encounters from the +2 August ,*** eruption at
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