Kwajalein Atoll Forecast
Thursday, September 18, 2025
KWAJALEIN FORECAST DISCUSSION
Low-end shower coverage is expected across the Kwajalein Atoll today and most of tonight before coverage begins to increase late tonight. The Inter-Tropical Convergence Zone (ITCZ) continues to reside near the central RMI, and its convergence will generate isolated showers at times throughout the area. A stray thunderstorm may also be possible in any deep convection that does manage to develop. Winds today will generally be east-northeasterly in the upper single digits with higher gusts near showers. Late tonight, a potent atmospheric wave will begin approaching the area, increasing shower coverage to widely scattered and increasing winds a couple of knots. Active weather is expected tomorrow as this feature makes its way through, with significant shower coverage likely throughout the day. This feature will bring deep moisture throughout the atmospheric column, so widespread, heavy rainfall will be possible. Stronger mid-level winds are also expected to accompany this feature, so significant wind gusts may be possible near any heavy showers that occur and are able to bring these stronger winds down to the surface. However, the increased vertical wind shear that will be associated with these winds will tend to keep the thunderstorm risk limited, along with upper-level conditions not being particularly favorable for lightning. Looking ahead, the ITCZ is likely to bring additional periods of shower activity through the end of the workweek and the beginning of the weekend. By the second half of the weekend, the ITCZ should shift north of the area and become more diffuse, allowing a doldrum-like pattern to take hold with decreased shower activity and very light winds. Shower coverage will be around 10% today and most of tonight, increasing to 20-25% late tonight. Combined seas on the open ocean will be 2-4 feet. SMS
TROPICAL CYCLONE ACTIVITY IN THE USAG-KA WATCH AREA
None.
WARNINGS AND ADVISORIES
None.
TODAY
Thursday, September 18, 2025
Weather Forecast
Partly sunny with stray to isolated showers. A stray thunderstorm cannot be completely ruled out.
87°F
Winds
NE-E at 5-10 knots with higher gusts near showers.
Sea Conditions Forecast
Open Ocean
2-4 ft
Lagoon
1-2 ft
TONIGHT
Thursday, September 18, 2025
Weather Forecast
Partly cloudy with stray to isolated showers increasing to widely scattered late. A stray thunderstorm cannot be completely ruled out.
78°F
Winds
NE-E at 7-12 knots with higher gusts near showers.
Sea Conditions Forecast
Open Ocean
2-4 ft
Lagoon
1-2 ft
TIDES
High of 2.9 ft at 2:54 PM
Low of 0.3 ft at 8:20 PM
High of 3.9 ft at 2:55 AM
Low of -0.3 ft at 9:19 AM
ALMANAC
Temperatures
Yesterday’s high: 81°F
Normal high: 87°F
Yesterday’s low: 77°F
Normal low: 78°F
Rainfall
Yesterday: 0.38”
September total: 3.77”
September deviation: -2.40”
Yearly total: 43.53”
Yearly deviation: -14.44”
Sun
Sunset: 6:48 PM
Sunrise: 6:39 AM
Moon
Moonset: 4:16 PM
Moonrise: 4:17 AM