Alert archive / Hawaii / Flash Flood Watches in 2020

Flash Flood Watch 3, NWS Honolulu, HI

March 27, 2020Honolulu County, Kauai County, Hawaii

NWS Honolulu, HI issued this flash flood watch at Mar 27, 2020, 3:23 PM HST for Honolulu County, Kauai County, Hawaii. It was in force for 48 hr.

The area

The counties it named.

The facts

Issued: Mar 27, 2020, 3:23 PM HST (01:23 UTC)
Expired: Mar 29, 2020, 2:55 PM HST
In force: 48 hr
Issued by: NWS Honolulu, HI
Flood severity: None

Counties Honolulu County, HI, Kauai County, HI

The radar

The South Kauai radar (PHKI), 76 km from the middle of the area, began a volume at 01:25 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

Lihue, (PHLI), launched 00:00Z, 1.4 hours before the alert went out and 60 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: 264 J/kg
Mixed-layer CIN: -117 J/kg
Mixed-layer LCL: 642 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: -37 m²/s²
0-3 km storm-relative helicity: 11 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.8

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 Mar 27, 10:10 AM HST, 5 hours 13 minutes earlier.

Area forecast discussion, Mar 27, 10:10 AM HST, 5 hours 13 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
Mar 27, 6:50 PM HST	Areal Flood Advisory	HFO	Honolulu	6 hr
Mar 27, 10:59 PM HST	Special Marine Warning	HFO		2 hr
Mar 27, 11:49 PM HST	Flash Flood Warning	HFO	Honolulu	3 hr
Mar 28, 12:01 AM HST	Areal Flood Advisory	HFO	Kauai	3 hr
Mar 28, 12:28 AM HST	Flash Flood Warning	HFO	Kauai	3 hr
Mar 28, 12:36 AM HST	Special Marine Warning	HFO		114 min
Mar 28, 1:00 AM HST	Flash Flood Warning Considerable damage threat	HFO	Kauai	3 hr
Mar 28, 1:31 AM HST	Special Marine Warning	HFO		119 min
Mar 28, 2:23 AM HST	Flash Flood Warning	HFO	Honolulu	3 hr
Mar 28, 2:25 AM HST	Special Marine Warning	HFO		65 min
Mar 28, 2:34 AM HST	Severe Thunderstorm Warning	HFO	Kauai	56 min
Mar 28, 2:57 AM HST	Flash Flood Warning Considerable damage threat	HFO	Kauai	3 hr
Mar 28, 3:21 AM HST	Special Marine Warning	HFO		114 min
Mar 28, 3:28 AM HST	Flash Flood Warning EmergencyCatastrophic damage threat	HFO	Kauai	3 hr
Mar 28, 3:44 AM HST	Flash Flood Warning	HFO	Honolulu	2 hr
Mar 28, 4:53 AM HST	Special Marine Warning	HFO		2 hr
Mar 28, 6:29 AM HST	Flash Flood Warning EmergencyCatastrophic damage threat	HFO	Kauai	6 hr
Mar 28, 6:43 AM HST	Special Marine Warning	HFO		2 hr
Mar 28, 8:34 AM HST	Special Marine Warning	HFO		116 min
Mar 28, 9:13 AM HST	Areal Flood Advisory	HFO	Honolulu	3 hr
Mar 28, 10:21 AM HST	Special Marine Warning	HFO		78 min

Nearby

Flash Flood Watches in Hawaii, 2020 Every flash flood watch in 2020

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.