An upper trough and a shear line at the surface combined to produce heavy showers over the islands, with Oahu and Molokai seeing the most significant events.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS HFO wrote it up.
An upper trough and a shear line at the surface combined to produce heavy showers over the islands, with Oahu and Molokai seeing the most significant events.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Honolulu, HI wrote its last area forecast discussion before the first event at Dec 30, 8:30 PM HST, 5 hours 15 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE HONOLULU HI 830 PM HST SUN DEC 30 2007 .SYNOPSIS...INCREASED SHOWER ACTIVITY CAN BE EXPECTED ACROSS OAHU AND MAUI COUNTY OVERNIGHT AS A WEAK TROUGH LINGERS OVER THE CENTRAL ISLANDS. A WEAK SHEAR LINE IS EXPECTED TO REACH KAUAI TONIGHT AND THEN STALL AND DISSIPATE OVER THE CENTRAL ISLANDS DURING THE MIDDLE OF THE WEEK. LIGHT WINDS ARE EXPECTED TONIGHT BUT WILL GRADUALLY INCREASE FROM A NORTHEAST DIRECTION AS WE ENTER THE NEW YEAR. A TYPICAL TRADE WIND PATTERN OF WINDWARD AND MAUKA SHOWERS IS EXPECTED FOR THE START OF 2008. && .DISCUSSION...THE TAIL END OF A FRONTAL BOUNDARY ASSOCIATED WITH A DEEPENING LOW IN THE GULF OF ALASKA WAS JUST NORTHWEST OF KAUAI THIS EVENING. FORECAST MODELS CONTINUE TO SHOW THIS FEATURE STALLING NORTH OF KAUAI TONIGHT AND MONDAY. IT WILL SLOWLY DISSIPATE AS IT MOVES TOWARD THE CENTRAL ISLAND TUESDAY AND WEDNESDAY. MODERATE NORTHEAST WINDS ARE EXPECTED TO SLOWLY FILTER ACROSS THE ISLAND CHAIN AS THE SHEAR LINE PASSES. A HIGH WILL TAKE UP A POSITION NORTH NORTHWEST OF THE STATE...NORTHEAST WINDS WILL FILTER ACROSS THE ISLANDS AND TYPICAL TRADE WIND WEATHER IS EXPECTED FOR FIRST WEEK OF 2008. AN INTERESTING PATTERN IS SEEN ON RADAR AND SATELLITE IMAGERY. NORTHERLY FLOW AS TAKEN OVER THE ISLAND OF KAUAI THIS EVENING. FURTHER DOWN THE CHAIN...A WEAK CIRCULATION APPEARED TO BE CENTERED BETWEEN OAHU AND MOLOKAI. SHOWERS ARE SEEN MOVING TOWARD THE EAST...NORTH OF MOLOKAI AND OAHU...WHILE SHOWERS ARE SEEN MOVING WESTWARD SOUTH OF THESE ISLANDS. FORECAST MODELS PICKED UP ON THIS FEATURE AND SHOWS THE CIRCULATION WEAKENING TONIGHT AND SHIFTING IT SOUTH ON MONDAY. SHOWERS ASSOCIATED WITH THIS FEATURE WILL CONTINUE TO AFFECT THE CENTRAL ISLANDS TONIGHT. MOUNTAIN SURFACE OBSERVATIONS ON MAUNA KEA ARE REPORTING TEMPERATURES IN THE LOWER TO MID 20S. MOISTURE UP THERE IS PRETTY HIGH WITH RELATIVE HUMIDITIES NEAR SATURATION. ALSO WITH MORE MOISTURE MOVING INTO THAT REGION...THERE COULD BE A POSSIBILITY OF A LIGHT DUSTING OF SNOW AT THE HIGHER ELEVATIONS. WILL SEND OUT AN EVENING UPDATE TO REFLECT CHANGES IN THE GRIDS TO ACCOUNT FOR INCREASED SHOWER ACTIVITY OVER THE CENTRAL ISLANDS AND THE POSSIBILITY OF LIGHT PRECIPITATION ON THE SUMMITS. && .MARINE... A SMALL CRAFT ADVISORY REMAINS UP DUE TO SEAS GENERATED FROM THE STRONG TRADES THIS PAST WEEK. ALSO THE HIGH SURF ADVISORY WAS EXTENDED THROUGH TONIGHT SINCE SEAS ARE STILL HIGH. A COUPLE OF MODERATE SIZE NORTH NORTHWEST SWELLS ARE EXPECTED THIS WEEK WITH THE FIRST ARRIVING TUESDAY AND THE SECOND ON THURSDAY. THIS MAY CAUSE SEAS TO REMAIN AROUND THE 10 FOOT SMALL CRAFT ADVISORY THRESHOLD ESPECIALLY OVER WATERS NORTH OF THE ISLANDS. && .HFO WATCHES/WARNINGS/ADVISORIES... SMALL CRAFT ADVISORY FOR ALL HAWAIIAN WATERS. HIGH SURF ADVISORY FOR EAST FACING SHORES. && ELAU
The national radar mosaic for the moment the first event began.
2 flash flood. Local standard time, as filed.
Flash flooding conditions closed Kamehameha Highway near Waikane for a time.
Heavy showers caused flash flooding in the eastern part of Molokai. Water was running over the bridge at Halawa Valley.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Hawaii in 2007Every state in 2007This day in weather historyWarnings in Hawaii, December 2007
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 67658, 67659.