TXXS28 KNES 101753
TCSSIO
A. 24S (IVONE)
B. 10/1715Z
C. 19.8S
D. 81.3E
E. THREE/MET-9
F. T2.5/3.5
G. IR/EIR/SWIR
H. REMARKS...CIRCULARLY DEFINED CLOUD LINES LOCATED LESS THAN 75NM FROM
A LARGE COLD OVERCAST YIELDS A DT OF 2.0. THE MET AND PT ARE 2.5 BASED
ON A SLOW WEAKENING TREND OVER THE PAST 24 HOURS. THE FT IS BASED ON
THE MET DUE TO UNCERTAINTY IN THE EXACT LLCC POSITION.
I. ADDL POSITIONS
NIL
...COVERDALE

TPXS10 PGTW 102107
A. TROPICAL CYCLONE 24S (IVONE)
B. 10/2030Z
C. 20.40S
D. 80.70E
E. SIX/MET9
F. T2.5/2.5/W0.5/24HRS STT: S0.0/03HRS
G. IR/EIR
H. REMARKS: 63A/PBO PRLY ORGNZD LLCC/ANMTN. DENSE OVERCAST SHEARED
30NM FROM LLCC YIELDS A DT OF 2.5. MET YIELDS 3.0. PT YIELDS 2.5.
DBO DT.
I. ADDITIONAL POSITIONS: NONE
SWANSON

TPXS10 PGTW 102352
A. TROPICAL CYCLONE 24S (IVONE)
B. 10/2330Z
C. 20.17S
D. 80.03E
E. SIX/MET9
F. T2.5/2.5/W0.5/24HRS STT: S0.0/03HRS
G. IR/EIR
H. REMARKS: 63A/PBO PRLY ORGNZD LLCC/ANMTN. DENSE OVERCAST SHEARED
45NM FROM LLCC YIELDS A DT OF 2.0. MET YIELDS 3.0. PT YIELDS 2.5.
DBO PT.
I. ADDITIONAL POSITIONS:
10/1927Z 20.08S 80.87E ATMS
SWANSON

TXXS28 KNES 110003
TCSSIO
A. 24S (IVONE)
B. 10/2330Z
C. 20.2S
D. 80.4E
E. FIVE/MET-9
F. T2.5/3.0
G. IR/EIR/SWIR/PRXY
H. REMARKS...CIRCULARLY DEFINED LLCC LESS THAN 1.25 DEGREES FROM
COLD OVERCAST YIELDS A DT OF 2.0. THE MET IS 2.5 BASED ON A 24HR SLOW
WEAKENING TREND. THE PT IS 2.5. THE FT IS BASED ON THE MET DUE TO
PULSING CONVECTION.
I. ADDL POSITIONS
NIL
...GATLING

24S IVONE 250311 0000 20.2S 79.9E SHEM 45 998

24S IVONE 250311 0000 20.2S 79.9E SHEM 45 998

全球热带气旋监测公报
预报：柳龙生 签发：钱奇峰 2025 年 03 月 11 日 10 时
“伊沃娜”向偏西方向移动
时 间：11日08时（北京时）
海 域：南印度洋
命 名：“伊沃娜”，IVONE
中心位置：南纬20.1度、东经80.5度
强度等级：热带风暴
最大风力：8级（20米/秒，相当于我国的热带风暴级）
中心气压：995百帕
参考位置：毛里求斯路易港偏东方向约2400公里的洋面上
变化过程：过去24小时，“伊沃娜”由9级减弱到8级
预报结论：“伊沃娜”将以每小时20-25公里的速度向偏西方向移动，强度变化不大。

图1 卫星红外监测图像（北京时间2025年03月11日08时00分）

TPXS10 PGTW 110307
A. TROPICAL CYCLONE 24S (IVONE)
B. 11/0230Z
C. 20.03S
D. 79.62E
E. SIX/MET9
F. T2.5/3.0/W0.5/24HRS STT: S0.0/03HRS
G. IR/EIR/VIS/MSI
H. REMARKS: 49A/PBO PTLY XPSD LLCC/ANMTN. TIGHTLY DEFINED CLOUD
LINES WITH COLD OVERCAST GREATER THAN 90NM ACROSS YIELD A DT OF
2.5. MET YIELDS A 3.0. PT AGREES WITH DT. DBO DT.
I. ADDITIONAL POSITIONS:
10/2226Z 19.68S 80.87E SSMS
HUYNH

TPXS10 PGTW 110605
A. TROPICAL CYCLONE 24S (IVONE)
B. 11/0530Z
C. 19.95S
D. 79.21E
E. SIX/MET9
F. T2.5/3.0/W0.5/24HRS STT: S0.0/03HRS
G. IR/EIR/VIS/MSI
H. REMARKS: 49A/PBO PTLY XPSD LLCC/ANMTN. TIGHTLY DEFINED CLOUD
LINES WITH COLD OVERCAST GREATER THAN 90NM ACROSS YIELD A DT OF
2.5. MET AND PT AGREE. DBO DT.
I. ADDITIONAL POSITIONS:
11/0021Z 20.02S 79.93E SSMS
11/0113Z 20.07S 80.13E SSMS
HUYNH

TXXS28 KNES 110559
TCSSIO
A. 24S (IVONE)
B. 11/0530Z
C. 20.0S
D. 78.9E
E. THREE/HIMAWARI-9
F. T2.0/2.5
G. IR/EIR/VIS
H. REMARKS...SYSTEM CHARACTERIZED BY CIRCULARLY-DEFINED CLOUD LINES AND
LLCC >1.25 DEG FM A LARGE COLD OVC RESULTING IN A DT OF 1.5. POLEWARD
OUTFLOW CHANNEL GOOD. MET=2.5 AND PT=2.0. FT BASED ON PT DUE TO
PULSING/IRREG CONVECTION.
I. ADDL POSITIONS
NIL
...KONON

24S IVONE 250311 0600 20.3S 79.1E SHEM 45 998