Hawaii County Climate Forecast is April 25, 2021

Hilo

Today: Showers likely, mostly before noon. Partly sunny, with highs close to 83. Calm winds blowing 5 to 9 miles per hour from the east. The probability of precipitation is 70%. New rainfall levels of less than a tenth of an inch possible.

Tonight: Showers likely. Mostly cloudy, with a low of about 63. Calm wind, blowing from west-southwest at about 10 km / h. The probability of precipitation is 60%. New rainfall levels of less than a tenth of an inch possible.

Monday: Showers likely, mostly before noon. Mostly cloudy with a high near 83. Light and changeable wind blowing 5 to 8 miles per hour in the afternoon. The probability of precipitation is 60%. New rainfall levels of less than a tenth of an inch possible.

Kona

Today: A few showers after noon. Mostly sunny with a high near 84. West-northwest winds 5 to 11 mph that become calm in the afternoon. The probability of precipitation is 30%. New rainfall levels of less than a tenth of an inch possible.

Tonight: A few showers. Partly cloudy, with a low of around 63. Calm wind, blowing at around 8 km / h from the east-northeast. The probability of precipitation is 20%.

THE ARTICLE CONTINUES BELOW THE ADVERT

Monday: A few showers, mainly after noon. Mostly sunny with a high near 83. Light and changeable wind blowing 5 to 10 miles per hour from the west. The probability of precipitation is 40%. New rainfall levels of less than a tenth of an inch possible.

Waimea

THE ARTICLE CONTINUES BELOW THE ADVERT

Today: A few showers, especially before noon. Partly sunny, peaking near 76. Breezes, with northeasterly winds of 15 to 21 mph, with gusts of up to 45 mph. The probability of precipitation is 40%. New rainfall levels of less than a tenth of an inch possible.

Tonight: A few showers. Mostly cloudy, with a low point around 52nd breeze, with an east-northeast wind of 7 to 24 km / h, with gusts of up to 34 km / h. The probability of precipitation is 40%. New levels of precipitation between a tenth and a quarter of an inch are possible.

Monday: A few showers. Partly sunny with a high near 75. North-northeast winds 5 to 10 miles per hour that become light and changeable in the afternoon. The probability of precipitation is 50%. New levels of precipitation between a tenth and a quarter of an inch are possible.

Kohala

THE ARTICLE CONTINUES BELOW THE ADVERT

Today: Showers likely, mostly before noon. Mostly cloudy, with a peak near 69. Breeze, with an east-northeast wind of 15 to 35 km / h, with gusts of up to 50 km / h. The probability of precipitation is 60%. New rainfall levels of less than a tenth of an inch possible.

Tonight: Showers likely, mostly before midnight. Mostly cloudy, with a minimum of about 44. Windy, with an easterly wind of 11-25 mph that gets weak. Gusts of wind could reach up to 22 miles per hour. The probability of precipitation is 60%. New rainfall levels of less than a tenth of an inch possible.

Monday: Showers likely, mostly after noon. Mostly cloudy, with a peak near 67. East wind around 10 km / h will be light and variable. The probability of precipitation is 60%. New rainfall levels of less than a tenth of an inch possible.

Southern big island

Today: A few showers before noon. Mostly sunny, with a peak near 84. Windy, with easterly winds of 21 to 42 km / h, which decreases to 15 to 20 km / h in the afternoon. Winds can blow up to 34 miles per hour. The probability of precipitation is 20%.

Tonight: A few showers after midnight. Partly cloudy, with a minimum of about 69. Breezes, with easterly winds of 11 to 25 mph, with gusts of up to 34 mph. The probability of precipitation is 20%.

Monday: single showers. Mostly sunny, with a high near 83. Windy, with easterly winds of 11-25 mph, with gusts of up to 34 mph. The probability of precipitation is 20%.

Feedback

Today: Showers likely, mostly before noon. Mostly cloudy with a high near 80. Northwest winds 7-11 mph turning east-northeast in the afternoon. The probability of precipitation is 70%. New levels of precipitation between a tenth and a quarter of an inch are possible.

Tonight: Showers likely. Mostly cloudy with a low of about 61. East-northeast winds 5 to 11 mph that calm down after midnight. The probability of precipitation is 60%. New levels of precipitation between a tenth and a quarter of an inch are possible.

Monday: Showers likely. Mostly cloudy with a high near 81. Light and changeable wind blowing from the east at 5 to 10 miles per hour in the afternoon. The probability of precipitation is 60%. New levels of precipitation between a tenth and a quarter of an inch are possible.

Waikoloa

Today: Sunny, with a high near 81. Windy, with east-southeast winds of 7-15 miles per hour turning northeast in the morning. Gusts of wind can reach up to 21 km / h.

Tonight: Mostly clear with a low point around 62. East winds 5 to 9 mph, which get weak after midnight.

Monday: A few showers after noon. Mostly sunny with a high near 81. Light and changeable wind blowing from west-northwest 5 to 8 miles per hour. The probability of precipitation is 40%. New rainfall levels of less than a tenth of an inch possible.

Summary

The moderate to locally breezy trade wind weather will continue today while a high pressure ridge lingers north of the state. Clouds and passing showers will favor windward and mountainous areas. The winds will be weak and variable on Monday as a cold front approaches the islands from the northwest. Lighter, widespread winds will allow local land and sea breezes to develop by Wednesday. The cold front is forecast to stall and dissolve near Kauai during this time. A new high pressure system penetrating the region will gradually increase the trade winds from Thursday.

discussion

A high pressure system north of the state will keep moderate to locally breezy trade winds in the forecast for another day. Passing clouds and showers, which are shown on satellite and radar images, tend to favor the windward and mountainous slopes of all islands. An upper low south of the islands and cold temperatures at high altitude will keep these temporary showers on the forecast for another day.
A weakening cold front approaching the islands from the northwest on Monday will break through the high pressure ridge north of the state, causing wind speeds to weaken. Lighter winds are forecast Monday through Wednesday as this weak frontal trough grinds to a halt near Kauai. Showers will linger along this dissolving headband. These lighter, large-scale winds will allow local land and sea breezes to develop over each island. The weather patterns will shift with converging ocean breezes and island heating cloudy building clouds during the day and some showers over the island mountains and inland. The upper low in the south of the islands is pulled northeast from Monday night to Tuesday, causing a slight increase in shower activity during this period.
There remains some uncertainty as to where this frontal shower band will end up in the forecast for next week. Long-haul models continue to show significant run-to-run differences in the final position of this dissolving frontal hollow. However, both the American and European global models show that during the Tuesday and Wednesday periods, prefrontal shower bands are developing over the smaller islands from Kauai to Maui. The amount of precipitation along the frontal or prefrontal shower strip remains modest in all of our forecasting aids.
A migratory high drifting across the Central Pacific Basin from west to east will cause the trade winds to gradually return to the region starting Thursday. Short showers and clouds will favor the windward and mountain slopes of each island until the next weekend.

aviation

The high pressures in the north of the state will hold moderate to stormy trade winds in place today before subsiding tonight as a front approaches from the west. Clouds and showers favor slopes and coasts facing upwind, with a few showers lee from time to time. Occasional MVFR cigs / Vsbys are possible during showers over windward locations, otherwise prevailing VFR conditions are expected.
AIRMET Sierra is in effect to darken the mountains on windward sections of Oahu, Molokai, Maui, and the Big Island. This morning the conditions should improve here.
AIRMET TANGO remains in force for low turbulence over and in the wind direction of the terrain of all islands. This AIRMET will probably last all day. AIRMET Tango is also in effect for moderate upper turbulence between FL270 and FL450. This AIRMET will probably also last all day.

marine

The surface high pressure far northeast of Oahu creates a sufficiently narrow pressure gradient back to the islands to maintain moderate to locally strong trade winds today. A recent ASCAT satellite pass observed winds at the Small Craft Advisory (SCA) level over the Kaiwi Channel and Maui’s leeward waters. As a result, the SCA has expanded in area and time to include these waters through this afternoon along with the windier waters around Maui County and south of the Big Island through Monday morning. Trade will weaken and turn south on Monday in response to an approaching front from the northwest of the island chain. The surface ridge northeast of the state will move further east of the islands on Tuesday and Wednesday, with the debilitating front disintegrating and stalling near the western islands. This leads to gentle and variable midweek breezes. The high pressure north of the state on Thursday will restore trade, which will pick up to moderate to new magnitudes again on Friday.
Surfing along all of the Hawaiian coasts will be well below the high surf recommendation thresholds for the next few days. The north-facing bank surf will remain very low through Monday, with only a small background north swell. The next noticeable west-northwest swell will arrive Monday night and Tuesday and this will reach the maximum surf in the moderate range. This swell will shift to the northwest on Wednesday and then to the north-northwest on Thursday. When that swell subsides, another potentially larger northwest swell in the late week along the double-digit north and west exposures can peak weekend surfing. Multi short-term and long-term south-southwest swell energy along the south coast will also support the near to slightly below average south coast surf today. The surf on the eastern coast will also stay around the spring season average through Monday, but will subside by the middle of the week as the trade winds weaken over and upstream of the state.

HFO clocks / warnings / notices Ad

Small Craft Advisory until Monday 6:00 AM HST for Maalaea Bay, Pailolo Channel, Alenuihaha Channel, Big Island Leeward Waters, Big Island Southeast Waters.
Small Craft Advisory until 6:00 p.m. HST tonight for Kaiwi Channel, Maui County Leeward Waters.

Data courtesy of NOAA.gov

Comments are closed.