TPXS10 PGTW 111752
A. TROPICAL CYCLONE 24S (IVONE)
B. 11/1730Z
C. 19.48S
D. 77.04E
E. SIX/MET9
F. T2.0/2.5/W0.5/24HRS STT: S0.0/03HRS
G. IR/EIR
H. REMARKS: 63A/PBO PRLY ORGNZD LLCC/ANMTN. LOOSELY DEFINED CLOUD
LINES WITH COLD OVERCAST GREATER THAN 90NM ACROSS YIELD A DT OF
1.5. MET AND PT YIELD 2.0. DBO PT.
I. ADDITIONAL POSITIONS:
11/1228Z 19.52S 77.93E SMOS
11/1253Z 19.75S 77.97E SSMS
11/1346Z 19.82S 77.95E SSMS
SWANSON

TXXS28 KNES 111750
TCSSIO
A. 24S (IVONE)
B. 11/1715Z
C. 19.9S
D. 76.9E
E. THREE/MET-9
F. T1.0/2.0
G. IR/EIR/SWIR
H. REMARKS...CIRCULARLY DEFINED CLOUD LINES LOCATED GREATER THAN 1.25
DEGREES FROM A SMALL COLD OVERCAST YIELDS A DT OF 1.0. THE MET IS 1.5
BASED ON A WEAKENING TREND OVER THE PAST 24 HOURS. THE PT IS 1.0. THE
FT IS BASED ON THE PT DUE TO WARMING CLOUD TOPS AND SINCE A PATTERN
ADJUSTMENT WAS MADE.
I. ADDL POSITIONS
NIL
...COVERDALE

TPXS10 PGTW 112100
A. TROPICAL CYCLONE 24S (IVONE)
B. 11/2030Z
C. 19.86S
D. 75.94E
E. SIX/MET9
F. T2.0/2.5/W0.5/24HRS STT: S0.0/03HRS
G. IR/EIR
H. REMARKS: 63A/PBO PRLY ORGNZD LLCC/ANMTN. LOOSELY DEFINED CLOUD
LINES WITH COLD OVERCAST GREATER THAN 90NM ACROSS YIELD A DT OF
1.5. MET YIELDS 1.5. PT YIELDS 2.0. DBO PT.
I. ADDITIONAL POSITIONS: NONE
SWANSON

TXXS28 KNES 120000
TCSSIO
A. 24S (IVONE)
B. 11/2330Z
C. 20.2S
D. 75.6E
E. FIVE/MET-9
F. T1.0/1.5
G. IR/EIR/SWIR
H. REMARKS...LOOSELY DEFINED LLC LESS THAN 1.25 DEGREES FROM COLD
OVERCAST YIELDS A DT OF 1.5. THE MET IS 1.5. THE PT IS 1.0. THE FT IS
BASED ON THE PT DUE TO PULSING CONVECTION.
I. ADDL POSITIONS
NIL
...GATLING

TPXS10 PGTW 120011
A. TROPICAL CYCLONE 24S (IVONE)
B. 11/2330Z
C. 19.89S
D. 74.94E
E. FOUR/MET9
F. T2.0/2.5/W0.5/24HRS STT: S0.0/03HRS
G. IR/EIR
H. REMARKS: 17A/PBO XPSD LLCC/ANMTN. LOOSELY DEFINED CLOUD LINES
WITH COLD OVERCAST GREATER THAN 90NM ACROSS YIELD A DT OF 1.5. MET
AND PT YIELDS 2.0. DBO PT.
I. ADDITIONAL POSITIONS: NONE
SWANSON

24S IVONE 250312 0000 19.7S 75.5E SHEM 40 997

全球热带气旋监测公报
预报：柳龙生 签发：钱奇峰 2025 年 03 月 12 日 10 时
“伊沃娜”向偏南方向移动
时 间：12日08时（北京时）
海 域：南印度洋
命 名：“伊沃娜”，IVONE
中心位置：南纬19.9度、东经75.5度
强度等级：热带风暴
最大风力：8级（18米/秒，相当于我国的热带风暴级）
中心气压：998百帕
参考位置：毛里求斯路易港偏东方向约1880公里的洋面上
变化过程：过去24小时，“伊沃娜”强度维持不变
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12日08时00分）

TPXS10 PGTW 120303
A. TROPICAL CYCLONE 24S (IVONE)
B. 12/0230Z
C. 19.38S
D. 74.77E
E. SIX/MET9
F. T1.0/2.0/W1.0/24HRS STT: W0.5/03HRS
G. IR/EIR/VIS/MSI
H. REMARKS: 63A/PBO PRLY ORGNZD LLCC/ANMTN. LOOSELY DEFINED CLOUD
LINES WITH COLD OVERCAST GREATER THAN 90NM ACROSS YIELD A DT OF
1.5. MET YIELDS A 2.0. PT AGREES WITH DT. DBO DT.
I. ADDITIONAL POSITIONS:
11/2212Z 19.82S 75.70E SSMS
DESSINO

TPXS10 PGTW 120303
A. TROPICAL CYCLONE 24S (IVONE)
B. 12/0230Z
C. 19.38S
D. 74.77E
E. SIX/MET9
F. T1.5/2.0/W1.0/24HRS STT: W0.5/03HRS
G. IR/EIR/VIS/MSI
H. REMARKS: 63A/PBO PRLY ORGNZD LLCC/ANMTN. LOOSELY DEFINED CLOUD
LINES WITH COLD OVERCAST GREATER THAN 90NM ACROSS YIELD A DT OF
1.5. MET YIELDS A 2.0. PT AGREES WITH DT. DBO DT.
I. ADDITIONAL POSITIONS:
11/2212Z 19.82S 75.70E SSMS
DESSINO

TXXS28 KNES 120544
TCSSIO
A. 24S (IVONE)
B. 12/0515Z
C. 19.6S
D. 74.9E
E. FIVE/MET-9
F. T1.0/1.0
G. IR/EIR/VIS
H. REMARKS...SYSTEM CHARACTERIZED BY LOOSELY-DEFINED CLOUD LINES AND
LLCC >1.25 DEG FM A LARGE COLD OVC RESULTING IN A DT OF 1.5. MET AND
PT=1.0. FT BASED ON MET DUE TO PULSING/IRREG CONVECTION.
I. ADDL POSITIONS
NIL
...KONON

TPXS11 PGTW 120605
A. TROPICAL CYCLONE 24S (JUDE)
B. 12/0530Z
C. 19.50S
D. 74.64E
E. SIX/MET9
F. T1.5/2.0/W1.0/24HRS STT: S0.0/03HRS
G. IR/EIR/VIS/MSI
H. REMARKS: 63A/PBO PRLY ORGNZD LLCC/ANMTN. LLCC LOCATED MORE THAN
75NM OUTSIDE OF COLD OVERCAST GREATER THAN 90NM ACROSS YIELDS A DT
OF 1.5. MET AND PT AGREE. DBO DT.
I. ADDITIONAL POSITIONS:
12/0054Z 19.25S 75.25E MMWI
12/0100Z 19.57S 74.77E SSMS
DESSINO

24S IVONE 250312 0600 19.4S 74.4E SHEM 40 997