Tropical Storm 4S (1991)
Track & history
Storm history
This system formed in the Southern Hemisphere in November 1991 and peaked as a tropical storm with maximum sustained winds of 50 mph (85 km/h) and a minimum pressure of 991 mb. It did not make landfall. The system was tracked for 9 days.
Track data
Download CSVData source: NOAA NCEI IBTrACS v04r01. IBTrACS v04r01 use constraints.
Gahtan, Jennifer; Knapp, Kenneth R.; Schreck, Carl J. III; Diamond, Howard J.; Kossin, James P.; Kruk, Michael C. (2024). International Best Track Archive for Climate Stewardship (IBTrACS) Project, Version 4.01. NOAA National Centers for Environmental Information. Cite the subset used and access date. IBTrACS v04r01 dataset DOI.
| Time UTC | Position | Strength | Wind | Pressure |
|---|---|---|---|---|
| 1991-11-20 06:00 | 8.1°S 73.7°E | TD | 25 mph / 35 km/h | — |
| 1991-11-20 12:00 | 8.4°S 72.9°E | TD | 25 mph / 35 km/h | — |
| 1991-11-20 18:00 | 8.6°S 72.3°E | TD | 25 mph / 35 km/h | — |
| 1991-11-21 00:00 | 8.9°S 71.8°E | TD | 25 mph / 35 km/h | — |
| 1991-11-21 06:00 | 9.3°S 71.2°E | TD | 25 mph / 35 km/h | — |
| 1991-11-21 12:00 | 9.7°S 70.9°E | TD | 25 mph / 35 km/h | 1002 mb |
| 1991-11-21 18:00 | 10.2°S 70.7°E | TD | 30 mph / 45 km/h | 1000 mb |
| 1991-11-22 00:00 | 10.5°S 70.6°E | TD | 30 mph / 45 km/h | 1000 mb |
Show all 36 points
| 1991-11-22 06:00 | 10.9°S 70.6°E | TD | 30 mph / 45 km/h | 997 mb |
| 1991-11-22 12:00 | 11.4°S 70.7°E | TD | 35 mph / 55 km/h | 997 mb |
| 1991-11-22 18:00 | 11.9°S 70.7°E | TS | 40 mph / 65 km/h | 994 mb |
| 1991-11-23 00:00 | 12.5°S 70.8°E | TS | 40 mph / 65 km/h | 991 mb |
| 1991-11-23 06:00 | 13.2°S 71.0°E | TS | 40 mph / 65 km/h | 991 mb |
| 1991-11-23 12:00 | 13.8°S 71.3°E | TS | 45 mph / 75 km/h | 991 mb |
| 1991-11-23 18:00 | 14.4°S 71.7°E | TS | 50 mph / 85 km/h | 993 mb |
| 1991-11-24 00:00 | 15.0°S 71.9°E | TS | 50 mph / 85 km/h | 997 mb |
| 1991-11-24 06:00 | 15.5°S 71.8°E | TS | 50 mph / 85 km/h | 997 mb |
| 1991-11-24 12:00 | 16.0°S 71.4°E | TS | 50 mph / 85 km/h | 997 mb |
| 1991-11-24 18:00 | 16.2°S 70.8°E | TS | 45 mph / 75 km/h | 997 mb |
| 1991-11-25 00:00 | 16.2°S 70.3°E | TS | 45 mph / 75 km/h | 997 mb |
| 1991-11-25 06:00 | 16.2°S 69.7°E | TS | 45 mph / 75 km/h | 997 mb |
| 1991-11-25 12:00 | 16.2°S 69.0°E | TS | 40 mph / 65 km/h | 997 mb |
| 1991-11-25 18:00 | 16.0°S 68.3°E | TD | 35 mph / 55 km/h | 997 mb |
| 1991-11-26 00:00 | 16.0°S 67.7°E | TD | 35 mph / 55 km/h | 1000 mb |
| 1991-11-26 06:00 | 15.8°S 66.9°E | TD | 30 mph / 45 km/h | 1000 mb |
| 1991-11-26 12:00 | 16.3°S 65.9°E | TD | 30 mph / 45 km/h | 1000 mb |
| 1991-11-26 18:00 | 17.2°S 64.5°E | TD | 30 mph / 45 km/h | 1000 mb |
| 1991-11-27 00:00 | 17.2°S 63.3°E | TD | 30 mph / 45 km/h | 1002 mb |
| 1991-11-27 06:00 | 17.2°S 62.2°E | TD | 30 mph / 45 km/h | 1002 mb |
| 1991-11-27 12:00 | 17.2°S 61.2°E | TD | 30 mph / 45 km/h | 1002 mb |
| 1991-11-27 18:00 | 17.0°S 60.0°E | TD | 25 mph / 35 km/h | 1005 mb |
| 1991-11-28 00:00 | 16.8°S 58.3°E | TD | 25 mph / 35 km/h | 1005 mb |
| 1991-11-28 06:00 | 17.0°S 57.2°E | TD | 25 mph / 35 km/h | 1006 mb |
| 1991-11-28 12:00 | 17.3°S 56.4°E | — | — | — |
| 1991-11-28 18:00 | 17.6°S 55.6°E | — | — | — |
| 1991-11-29 00:00 | 17.9°S 54.9°E | — | — | — |
Tropical Storm 4S 1991 FAQ
Did Tropical Storm 4S 1991 make landfall?
No. The best track does not record a landfall for 4S; it stayed over water.
How strong did 4S get in 1991?
4S peaked as a tropical storm with maximum sustained winds of 50 mph (85 km/h) and a minimum central pressure of 991 mb.
When did 4S form and dissipate?
4S was first tracked on Nov 20 1991 and last tracked on Nov 29 1991, about 9 days in all.