Weather Alert in Hawaii
Flash Flood Warning issued February 21 at 10:51AM HST until February 21 at 12:45PM HST by NWS Honolulu HI
AREAS AFFECTED: Oahu in Honolulu, HI
DESCRIPTION: At 1051 AM HST, radar and automated rain gauges indicate heavy rain falling over the Koolau Mountains and Windward Oahu. Rain rates have decreased to around 1 to 2 inches per hour and most area streams have leveled off or are slowly receding. The heaviest rain currently lies along an axis from Ahuimanu to Turtle Bay. HAZARD...Heavy rain producing life threatening flash flooding. SOURCE...Radar and automated gauges. IMPACT...Significant and life threatening flooding in drainages, streams, rivers, roads, properties, and other low lying areas. Multiple public road closures expected, as well as landslides in steep terrain. Some locations that will experience flash flooding include... Honolulu, Waipio, Waiahole, Waikane, Kahaluu, Ahuimanu, Pearl City, Aiea, Halawa, Mililani, Kaaawa, Moanalua, Salt Lake, Waikele, Wahiawa, Punaluu, Waipahu, Kalihi, Kaneohe and Wheeler Field.
INSTRUCTION: Stay away from streams, rivers, drainage ditches, and culverts, even if they are currently dry. The heavy rains may cause rock and mudslides in steep terrain areas.
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Weather Topic: What are Nimbostratus Clouds?
Home - Education - Cloud Types - Nimbostratus Clouds
Next Topic: Precipitation
A nimbostratus cloud is similar to a stratus cloud in its formless,
smooth appearance. However, a nimbostratus cloud is darker than a stratus cloud,
because it is thicker.
Unlike a stratus cloud, a nimbostratus cloud typically brings with it the threat
of moderate to heavy precipitation. In some cases, the precipitation may evaporate
before reaching the ground, a phenomenon known as virga.
Next Topic: Precipitation
Weather Topic: What is Rain?
Home - Education - Precipitation - Rain
Next Topic: Shelf Clouds
Precipitation in the form of water droplets is called rain.
Rain generally has a tendency to fall with less intensity over a greater period
of time, and when rainfall is more severe it is usually less sustained.
Rain is the most common form of precipitation and happens with greater frequency
depending on the season and regional influences. Cities have been shown to have
an observable effect on rainfall, due to an effect called the urban heat island.
Compared to upwind, monthly rainfall between twenty and forty miles downwind of
cities is 30% greater.
Next Topic: Shelf Clouds
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