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本帖最后由 ygsj24 于 2025-10-5 18:00 编辑
WTIO31 PGTW 050900
MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
SUBJ/TROPICAL CYCLONE 02A (SHAKHTI) WARNING NR 010//
RMKS/
1. TROPICAL CYCLONE 02A (SHAKHTI) WARNING NR 010
01 ACTIVE TROPICAL CYCLONE IN NORTHIO
MAX SUSTAINED WINDS BASED ON ONE-MINUTE AVERAGE
WIND RADII VALID OVER OPEN WATER ONLY
---
WARNING POSITION:
050600Z --- NEAR 20.5N 61.4E
MOVEMENT PAST SIX HOURS - 245 DEGREES AT 05 KTS
POSITION ACCURATE TO WITHIN 060 NM
POSITION BASED ON CENTER LOCATED BY SATELLITE
PRESENT WIND DISTRIBUTION:
MAX SUSTAINED WINDS - 065 KT, GUSTS 080 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 064 KT WINDS - 020 NM NORTHEAST QUADRANT
020 NM SOUTHEAST QUADRANT
020 NM SOUTHWEST QUADRANT
020 NM NORTHWEST QUADRANT
RADIUS OF 050 KT WINDS - 035 NM NORTHEAST QUADRANT
035 NM SOUTHEAST QUADRANT
035 NM SOUTHWEST QUADRANT
035 NM NORTHWEST QUADRANT
RADIUS OF 034 KT WINDS - 060 NM NORTHEAST QUADRANT
080 NM SOUTHEAST QUADRANT
070 NM SOUTHWEST QUADRANT
060 NM NORTHWEST QUADRANT
REPEAT POSIT: 20.5N 61.4E
---
FORECASTS:
12 HRS, VALID AT:
051800Z --- 20.1N 60.7E
MAX SUSTAINED WINDS - 055 KT, GUSTS 070 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 050 KT WINDS - 020 NM NORTHEAST QUADRANT
020 NM SOUTHEAST QUADRANT
020 NM SOUTHWEST QUADRANT
020 NM NORTHWEST QUADRANT
RADIUS OF 034 KT WINDS - 050 NM NORTHEAST QUADRANT
060 NM SOUTHEAST QUADRANT
050 NM SOUTHWEST QUADRANT
040 NM NORTHWEST QUADRANT
VECTOR TO 24 HR POSIT: 225 DEG/ 03 KTS
---
24 HRS, VALID AT:
060600Z --- 19.7N 60.3E
MAX SUSTAINED WINDS - 045 KT, GUSTS 055 KT
WIND RADII VALID OVER OPEN WATER ONLY
RADIUS OF 034 KT WINDS - 030 NM NORTHEAST QUADRANT
040 NM SOUTHEAST QUADRANT
030 NM SOUTHWEST QUADRANT
020 NM NORTHWEST QUADRANT
VECTOR TO 36 HR POSIT: 125 DEG/ 02 KTS
---
36 HRS, VALID AT:
061800Z --- 19.5N 60.6E
MAX SUSTAINED WINDS - 035 KT, GUSTS 045 KT
WIND RADII VALID OVER OPEN WATER ONLY
DISSIPATING AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER
RADIUS OF 034 KT WINDS - 040 NM NORTHEAST QUADRANT
070 NM SOUTHEAST QUADRANT
050 NM SOUTHWEST QUADRANT
040 NM NORTHWEST QUADRANT
VECTOR TO 48 HR POSIT: 100 DEG/ 03 KTS
---
EXTENDED OUTLOOK:
48 HRS, VALID AT:
070600Z --- 19.4N 61.2E
MAX SUSTAINED WINDS - 030 KT, GUSTS 040 KT
WIND RADII VALID OVER OPEN WATER ONLY
DISSIPATED AS A SIGNIFICANT TROPICAL CYCLONE OVER WATER
---
REMARKS:
050900Z POSITION NEAR 20.4N 61.2E.
05OCT25. TROPICAL CYCLONE 02A (SHAKHTI), LOCATED APPROXIMATELY
146 NM EAST OF MASIRAH ISLAND, HAS TRACKED WEST-SOUTHWESTWARD AT
05 KNOTS OVER THE PAST SIX HOURS. MINIMUM CENTRAL PRESSURE AT 050600Z
IS 984 MB. MAXIMUM SIGNIFICANT WAVE HEIGHT AT 050600Z IS 18 FEET. NEXT
WARNINGS AT 051500Z, 052100Z, 060300Z AND 060900Z.//
NNNN
- WDIO31 PGTW 050900
- MSGID/GENADMIN/JOINT TYPHOON WRNCEN PEARL HARBOR HI//
- SUBJ/PROGNOSTIC REASONING FOR TROPICAL CYCLONE 02A (SHAKHTI) WARNING
- NR 010//
- RMKS/
- 1. FOR METEOROLOGISTS.
- 2. 6 HOUR SUMMARY AND ANALYSIS.
- SUMMARY:
- INITIAL POSITION: 20.5N 61.4E
- INITIAL INTENSITY: 65 KTS
- GEOGRAPHIC REFERENCE: 146 NM EAST OF MASIRAH ISLAND
- MOVEMENT PAST 6 HOURS: WEST-SOUTHWESTWARD AT 05 KTS
- SIGNIFICANT WAVE HEIGHT: 18 FEET
- SATELLITE ANALYSIS, INITIAL POSITION AND INTENSITY DISCUSSION:
- ANIMATED MULTISPECTRAL SATELLITE IMAGERY (MSI) DEPICTS PERSISTENT
- DEEP CONVECTION OFFSET TO THE SOUTH OF THE COMPACT LOW-LEVEL
- CIRCULATION CENTER (LLCC). THE POLEWARD OUTFLOW HAS WEAKENED,
- INDICATIVE OF THE EASTERLY DRY AIR ENTRAINMENT AND THE EAST-
- NORTHEASTERLY SHEAR. A 050216Z WSFM MICROWAVE IMAGE REVEALS THAT
- TROPICAL CYCLONE (TC) 02A HAS RETAINED ITS MICROWAVE EYE, DESPITE THE
- MARGINALLY UNFAVORABLE ENVIRONMENT AND OBFUSCATION OF THE LLCC BY THE
- CENTRAL DENSE OVERCAST. ANALYSIS INDICATES THAT THE ENVIRONMENT IS
- CHARACTERIZED BY MODERATE TO HIGH (20-25 KTS) VERTICAL WIND SHEAR,
- DRY AIR, AND UPWELLING ASSOCIATED WITH THE STORM'S STAGNATION. THE
- INITIAL
- POSITION IS PLACED WITH MEDIUM CONFIDENCE BASED ON EXTRAPOLATION
- FROM THE AFOREMENTIONED 050216Z WSFM MICROWAVE IMAGE AND A 050436Z
- METOP-B ASCAT PARTIAL PASS REVEALING THE LLCC. THE INITIAL
- INTENSITY OF 65 KTS IS ASSESSED WITH MEDIUM CONFIDENCE BASED ON THE
- 050436Z METOP-B ASCAT PARTIAL PASS, CORROBORATED BY THE OBJECTIVE
- INTENSITY AIDS AND AGENCY DVORAK FIXES LISTED BELOW.
- INITIAL WIND RADII BASIS: OBJECTIVE BEST TRACK AND THE 050436Z METOP-
- B ASCAT IMAGE.
- CURRENT STEERING MECHANISM: COMPETING STEERING ENVIRONMENT BETWEEN
- A SUBTROPICAL RIDGE (STR) POSITIONED OVER SAUDI ARABIA AND AN STR
- POSITIONED OVER THE EASTERN ARABIAN SEA
- AGENCY DVORAK AND AUTOMATED FIXES:
- PGTW: T4.0 - 65 KTS
- KNES: T4.5 - 77 KTS
- DEMS: T3.5 - 55 KTS
- CIMSS ADT: 57 KTS AT 050630Z
- CIMSS AIDT: 68 KTS AT 050630Z
- CIMSS D-PRINT: 57 KTS AT 050630Z
- FORECASTER ASSESSMENT OF CURRENT ENVIRONMENT: MARGINALLY
- UNFAVORABLE
- VWS: 20-25 KTS
- SST: 27-28 CELSIUS
- OUTFLOW: MODERATE EQUATORWARD
- OTHER FACTORS: DRY AIR ENTRAINMENT AND UPWELLING
- ANALYSIS CONFIDENCE:
- INITIAL POSITION: MEDIUM
- INITIAL INTENSITY: MEDIUM
- INITIAL WIND RADII: MEDIUM
- 3. FORECAST REASONING.
- SIGNIFICANT FORECAST CHANGES: THERE ARE NO SIGNIFICANT CHANGES TO
- THE FORECAST FROM THE PREVIOUS WARNING.
- FORECAST DISCUSSION: TC 02A WILL CONTINUE ITS SLOW SOUTHWESTWARD
- TRACK FOR THE NEXT 24 HOURS AS IT REMAINS UNDER THE INFLUENCE OF
- THE SOUTHEASTERN PERIPHERY OF THE PRIMARY STEERING RIDGE OVER SAUDI
- ARABIA. AROUND TAU 24, 02A WILL TAKE AN EAST-SOUTHEASTWARD CURVE AS
- A DEEP-LAYER TROUGH BREAKS DOWN THE STR POSITIONED OVER THE EASTERN
- ARABIAN SEA. THE STR WILL EXTEND SOUTHWEST AND WEST, CAUSING 02A TO
- BRIEFLY STALL BEFORE RECURVING OVER THE NOW-DOMINANT STEERING
- RIDGE. 02A WILL TRACK EAST-SOUTHEASTWARD ALONG THE NORTHWESTERN
- PERIPHERY OF THE STR UNTIL THE END OF THE FORECAST PERIOD. 02A IS
- FORECAST TO STEADILY WEAKEN FROM HERE ON OUT DUE TO THE SIGNIFICANT
- DRY AIR ENTRAINMENT AND INCREASING WIND SHEAR. AS A RESULT OF THE
- STORM'S SLOW TRACK MOTION, COOLER WATER UPWELLING HAS ALSO HINDERED
- DEVELOPMENT AND WILL LIKELY HASTEN DISSIPATION. DISSIPATION IS
- FORECAST NO LATER THAN TAU 48.
- MODEL DISCUSSION: DETERMINISTIC TRACK MODELS ARE IN DECENT
- AGREEMENT ON A SOUTHWESTWARD TRACK THROUGH TAU 24 BUT HAVE VARYING
- TRACK SPEEDS. THOUGH MOST MODELS AGREE ON A SOUTHEASTWARD CURVE
- BEGINNING AFTER TAU 24, THE TRACK SPEED DIFFERENCES GREATLY IMPACT
- THE LOCATION AT WHICH 02A WILL TURN, LENDING UNCERTAINTY TO THE
- JTWC TRACK FORECAST. OUTLIERS INCLUDE NAVGEM -- WHICH TRACKS 02A
- SOUTHWEST UNTIL TAU 48 BEFORE RECURVING, AND GFS -- WHICH IS THE
- ONLY MODEL PREDICTING A NORTHEASTERN CURVE. THE JTWC TRACK FORECAST
- IS PLACED SLIGHTLY EAST OF THE MULTI-MODEL CONSENSUS WITH MEDIUM
- CONFIDENCE. INTENSITY GUIDANCE IS IN STRONG AGREEMENT THROUGH
- TAU 48, WITH ALL MODELS PREDICTING A CONSISTENT WEAKENING TREND
- BEGINNING IMMINENTLY WITH DISSIPATION FORECAST WITHIN 48 HOURS. AS
- A RESULT, THE JTWC INTENSITY FORECAST IS PLACED WITH HIGH
- CONFIDENCE.
- FORECAST CONFIDENCE:
- TRACK 00-72 HR: MEDIUM
- INTENSITY 00-72 HR: HIGH//
- NNNN
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