Alert archive / Hawaii / Flash Flood Watches in 2011

Flash Flood Watch 14, NWS Honolulu, HI

November 4, 20114 counties in Hawaii

NWS Honolulu, HI issued this flash flood watch at Nov 4, 2011, 4:02 AM HST for 4 counties in Hawaii. It was in force for 52 hr.

The area

The counties it named.

The facts

Issued: Nov 4, 2011, 4:02 AM HST (14:02 UTC)
Expired: Nov 6, 2011, 7:58 AM HST
In force: 52 hr
Issued by: NWS Honolulu, HI
Flood severity: None

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

The radar

The Molokai radar (PHMO), 38 km from the middle of the area, began a volume at 14:03 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, 2.0 hours before the alert went out and 304 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: 1184 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 578 m above ground
0-6 km bulk shear: 2 kt
0-1 km storm-relative helicity: -20 m²/s²
0-3 km storm-relative helicity: -8 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 Nov 4, 3:30 AM HST, 32 minutes earlier.

Area forecast discussion, Nov 4, 3:30 AM HST, 32 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
Nov 3, 5:23 PM HST	Areal Flood Advisory	HFO	Hawaii	90 min
Nov 3, 10:17 PM HST	Areal Flood Advisory	HFO	Honolulu	2 hr
Nov 4, 3:11 AM HST	Areal Flood Advisory	HFO	Hawaii	3 hr
Nov 4, 3:38 AM HST	Areal Flood Advisory	HFO	Kalawao	3 hr
Nov 4, 4:17 AM HST	Flash Flood Warning	HFO	Kalawao	3 hr
Nov 4, 7:14 AM HST	Areal Flood Advisory	HFO	Kalawao	115 min
Nov 4, 7:56 AM HST	Special Marine Warning	HFO		100 min

Nearby

Flash Flood Watches in Hawaii, 2011 Every flash flood watch in 2011

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.