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 18 时
“伊沃娜”向偏西方向移动
时 间：11日14时（北京时）
海 域：南印度洋
命 名：“伊沃娜”，IVONE
中心位置：南纬20.4度、东经79.2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2260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2 卫星红外监测图像（北京时间2025年03月11日14时00分）

TPXS10 PGTW 110911
A. TROPICAL CYCLONE 24S (IVONE)
B. 11/0830Z
C. 20.00S
D. 78.92E
E. FOUR/MET9
F. T2.5/2.5/S0.0/24HRS STT: S0.0/03HRS
G. IR/EIR/VIS/MSI
H. REMARKS: 19A/PBO XPSD LLCC/ANMTN. TIGHTLY DEFINED CLOUD LINES
WITH COLD OVERCAST GREATER THAN 90NM ACROSS YIELD A DT OF 2.5. MET
AGREES. PT YIELDS A 2.0. DBO DT.
I. ADDITIONAL POSITIONS:
11/0354Z 20.25S 79.40E MMHS
11/0437Z 20.25S 79.08E MMHS
HUYNH

TXXS28 KNES 111150
TCSSIO
A. 24S (IVONE)
B. 11/1115Z
C. 19.9S
D. 78.8E
E. THREE/MET-9
F. T1.5/2.5
G. IR/EIR/VIS
H. REMARKS...CIRCULARLY DEFINED CLOUD LINES AND A CENTER OVER 1.25
DEGREES TO THE NW OF A VERY SMALL COLD OVERCAST RESULTS IN A DT OF 1.0
USING THE SHEAR PATTERN. THE MET IS 2.0. THE PT IS 1.5. THE FT IS BASED
ON THE PT DUE TO FLUCTUATING CONVECTION.
I. ADDL POSITIONS
NIL
...TURK

TPXS10 PGTW 111152
A. TROPICAL CYCLONE 24S (IVONE)
B. 11/1130Z
C. 19.97S
D. 78.31E
E. FOUR/MET9
F. T2.0/2.5/W0.5/24HRS STT: W0.5/03HRS
G. IR/EIR/VIS/MSI
H. REMARKS: 19A/PBO XPSD LLCC/ANMTN. CIRCULARLY DEFINED CLOUD LINES
WITH COLD OVERCAST GREATER THAN 90NM ACROSS YIELD A DT OF 2.0. MET
YIELDS 2.5. PT YIELDS 2.0. DBO DT.
I. ADDITIONAL POSITIONS: NONE
RAE

24S IVONE 250311 1200 20.1S 78.2E SHEM 45 992

ACE: 2.7325

TPXS10 PGTW 111457
A. TROPICAL CYCLONE 24S (IVONE)
B. 11/1430Z
C. 19.31S
D. 77.28E
E. FOUR/MET9
F. 2.0/2.5/W0.5/24HRS STT: S0.0/03HRS
G. IR/EIR
H. REMARKS: 17A/PBO XPSD LLCC/ANMTN. CIRCULARLY DEFINED CLOUD LINES
WITH COLD OVERCAST GREATER THAN 90NM ACROSS YIELD A DT OF 2.0. MET
YIELDS 1.5. PT YIELDS 2.0. DBO DT.
I. ADDITIONAL POSITIONS: NONE
RAE

1.A REMNANT LOW 13 (IVONE)
2.A POSITION 2025/03/11 AT 1800 UTC:
WITHIN 20 NM RADIUS OF POINT 20.1 S / 76.9 E
MOVEMENT: WEST-NORTH-WEST 11 KT
3.A DVORAK ANALYSIS: 1.5/2.5/W 1.0/6 H
4.A CENTRAL PRESSURE: 1001 HPA
5.A MAX AVERAGE WIND SPEED (10 MN): 45 KT
1.B FORECASTS (WINDS RADII IN KM):
12H: 2025/03/12 06 UTC: 20.4 S / 73.4 E, VENT MAX= 035 KT, REMNANT
LOW
28 KT NE: 0 SE: 555 SW: 405 NW: 0
34 KT NE: 0 SE: 345 SW: 220 NW: 0
24H: 2025/03/12 18 UTC: 21.1 S / 70.9 E, VENT MAX= 035 KT, FILLING UP
28 KT NE: 0 SE: 470 SW: 230 NW: 0
34 KT NE: 0 SE: 285 SW: 0 NW: 0
36H: 2025/03/13 06 UTC: 22.6 S / 68.7 E, VENT MAX= 030 KT, FILLING UP
28 KT NE: 0 SE: 435 SW: 0 NW: 0
48H: 2025/03/13 18 UTC: 25.5 S / 67.6 E, VENT MAX= 035 KT,
DISSIPATING
28 KT NE: 140 SE: 435 SW: 0 NW: 0
34 KT NE: 65 SE: 280 SW: 0 NW: 0
60H: 2025/03/14 06 UTC: 29.2 S / 67.2 E, VENT MAX= 035 KT,
DISSIPATING
28 KT NE: 240 SE: 470 SW: 400 NW: 0
34 KT NE: 130 SE: 280 SW: 0 NW: 0
72H: 2025/03/14 18 UTC: 34.4 S / 69.2 E, VENT MAX= 035 KT,
DISSIPATING
28 KT NE: 425 SE: 405 SW: 215 NW: 0
34 KT NE: 220 SE: 250 SW: 185 NW: 0
2.B LONGER-RANGE OUTLOOK:
NIL

24S IVONE 250311 1800 19.8S 77.0E SHEM 45 990