Alert archive / Hawaii / Flash Flood Watches in 2007

Flash Flood Watch 9, NWS Honolulu, HI

December 31, 2007Hawaii County, Kalawao County, Hawaii

NWS Honolulu, HI issued this flash flood watch at Dec 31, 2007, 4:57 AM HST for Hawaii County, Kalawao County, Hawaii. It was in force for 13 hr.

The area

The counties it named.

The facts

Issued
Dec 31, 2007, 4:57 AM HST (14:57 UTC)
Expired
Dec 31, 2007, 6:00 PM HST
In force
13 hr
Issued by
NWS Honolulu, HI
Flood severity
None

Counties Hawaii County, HI, Kalawao County, HI

The nearest sounding before it

Hilo, (PITO), launched 12:00Z, 3.0 hours before the alert went out and 150 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Hilo, at 12:00Z on 2007-12-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 235 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Hilo, at 12:00Z on 2007-12-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -2 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
235 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
718 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
-2 m²/s²
0-3 km storm-relative helicity
3 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood watch went out, 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 this flash flood watch went out at Dec 31, 4:30 AM HST, 27 minutes earlier.

Area forecast discussion, Dec 31, 4:30 AM HST, 27 minutes before
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The office that day

Everything else NWS Honolulu, HI issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Dec 30, 11:46 PM HSTFlash Flood WarningHFOHonolulu3 hr
Dec 31, 12:16 AM HSTFlash Flood WarningHFOKalawao3 hr
Dec 31, 8:23 AM HSTFlash Flood WarningHFOKalawao3 hr
Dec 31, 11:23 AM HSTFlash Flood WarningHFOKalawao2 hr

Nearby

Flash Flood Watches in Hawaii, 2007Every flash flood watch in 2007

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.