Alert archive / Hawaii / Flash Flood Watches in 2016

Flash Flood Watch 8, NWS Honolulu, HI

September 13, 2016Hawaii County, Honolulu County, Kalawao County, Hawaii

NWS Honolulu, HI issued this flash flood watch at Sep 13, 2016, 3:22 AM HST for Hawaii County, Honolulu County, Kalawao County, Hawaii. It took effect at Sep 13, 2016, 4:00 AM HST. It was in force for 3 days.

The area

The counties it named.

The facts

Issued: Sep 13, 2016, 3:22 AM HST (13:22 UTC)
In effect from: Sep 13, 2016, 4:00 AM HST
Expired: Sep 16, 2016, 3:49 PM HST
In force: 3 days
Issued by: NWS Honolulu, HI
Flood severity: None

Counties Hawaii County, HI, Honolulu County, HI, Kalawao County, HI

The radar

The Molokai radar (PHMO), 57 km from the middle of the area, began a volume at 13:23 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Hilo, (PITO), launched 12:00Z, 1.4 hours before the alert went out and 221 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 156 J/kg
Mixed-layer CIN: -149 J/kg
Mixed-layer LCL: 1014 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 7 m²/s²
0-3 km storm-relative helicity: 24 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

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 Sep 12, 8:00 PM HST, 7 hours 22 minutes earlier.

Area forecast discussion, Sep 12, 8:00 PM HST, 7 hours 22 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 12, 6:16 PM HST	Areal Flood Advisory	HFO	Kalawao	3 hr
Sep 12, 6:23 PM HST	Flash Flood Warning	HFO	Kalawao	5 hr
Sep 13, 8:53 AM HST	Areal Flood Advisory	HFO	Kalawao	6 hr
Sep 13, 12:44 PM HST	Areal Flood Advisory	HFO	Honolulu	3 hr
Sep 13, 1:14 PM HST	Flash Flood Warning	HFO	Kalawao	3 hr

Nearby

Flash Flood Watches in Hawaii, 2016 Every flash flood watch in 2016

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; radar from the NEXRAD Level II archive.