“Kona” Low Rainy Week Ahead for Hawaii
Hawaii is facing a multi-day rainfall threat this week, bringing both hope for drought relief and concerns about flash flooding. Meteorologists are closely monitoring a weather pattern known as a Kona low, which typically brings low pressure and tropical rain to the Hawaiian Islands. This occurrence is marked by south-to-southwest winds, different from the usual east-northeast trade winds.
The term “Kona” in Hawaiian refers to leeward, indicating winds with a southerly component. A recent storm in the Aleutian Islands led to the development of low pressure west of Hawaii, pulling in tropical Pacific moisture. While the rainfall may alleviate drought conditions, it also poses a risk of flash flooding.
The greatest concerns for flash flooding and power outages lie in the westernmost islands—Oahu, Kauai, and Niihau—and the southern half of the Big Island until Thursday. Rainfall amounts could reach 2-3 inches in parts of the western islands, with higher amounts in the south- and southeast-facing slopes of Kauai and Oahu due to the southerly flow.
US Meteorologist explained that the enhanced moisture will intensify shower and thunderstorm activity, leading to localized flooding, mudslides, and debris flows, especially in areas affected by recent wildfires.
Flood watches have been issued statewide, anticipating heavy rainfall through Thursday afternoon. The Big Island’s southern slopes may experience 1-2 inches of rainfall through the weekend, posing risks of stream overflow, road closures, and urban flooding.
While the wet conditions are expected to persist through the week, rain and thunderstorms may linger in the western islands on Saturday. Although some areas are reopening for tourism, those affected by the Lahaina wildfire in Maui County are still grappling with rebuilding efforts.
Drought conditions across Hawaii vary from moderate to extreme levels, according to the U.S. Drought Monitor. Forecasters anticipate that this week’s rainfall may offer slight improvements to the drought but might not completely alleviate the dry conditions. Boaters and mariners are advised to exercise caution offshore, especially north and west of Oahu and Kauai.
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