Alert archive / Hawaii / Flash Flood Warnings in 2021
Flash Flood Warning 23, NWS Honolulu, HI
NWS Honolulu, HI issued this flash flood warning at Mar 10, 2021, 6:26 PM HST for Kauai County, Hawaii. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Mar 10, 2021, 6:26 PM HST (04:26 UTC)
- Expired
- Mar 10, 2021, 9:30 PM HST
- In force
- 3 hr
- Issued by
- NWS Honolulu, HI
- Area
- Storm-based polygon
- Flood severity
- None
County Kauai County, HI
The radar
The South Kauai radar (PHKI), 22 km from the middle of the area, began a volume at 04:27 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, 4.4 hours before the alert went out and 18 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.
- Mixed-layer CAPE
- 858 J/kg
- Mixed-layer CIN
- -3 J/kg
- Mixed-layer LCL
- 769 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- 20 m²/s²
- 0-3 km storm-relative helicity
- 51 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
096
WGHW50 PHFO 110426
FFWHFO
HIC007-110730-
/O.NEW.PHFO.FF.W.0023.210311T0426Z-210311T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Honolulu HI
626 PM HST Wed Mar 10 2021
The National Weather Service in Honolulu has issued a
* Flash Flood Warning for...
The island of Kauai in Kauai County
* Until 930 PM HST.
* At 626 PM HST, radar showed heavy showers and a few embedded
thunderstorms lifting northward over Kauai. Rainfall rates up to 2
to 3 inches per hour with locally higher amounts can be expected.
Saturated grounds and rising water levels in streams are expected
to lead to flash flooding.
HAZARD...Flash flooding caused by heavy rain.
SOURCE...Radar indicated.
IMPACT...Flooding in drainages, streams, rivers, roads,
properties, and other low-lying areas. Public road
closures possible in some areas. Landslides are
possible in steep terrain.
* Some locations that will experience flash flooding include...
Lihue, Kapaa, Kalaheo, Kekaha, Princeville, Kilauea, North Fork
Wailua Trails, Alakai Swamp Trails, Lawai, Omao, Kokee State Park,
Wailua Homesteads, Hanalei, Hanapepe, Wainiha, Na Pali State Park,
Koloa, Haena, Waimea and Wailua.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Stay away from streams, rivers, drainage ditches, and culverts, even
if they are currently dry.
Do not cross fast flowing or rising water in your vehicle, or on
foot. Turn around, don't drown.
Excessive runoff from heavy rainfall will cause flooding of drainage
ditches and streams, streets, highways, properties, and other low
lying spots.
The heavy rains may cause rock and mudslides in steep terrain areas.
&&
This warning may need to be extended beyond 930 PM HST if flooding
persists.
LAT...LON 2225 15940 2222 15933 2216 15930 2215 15928
2205 15932 2196 15932 2195 15934 2193 15934
2190 15938 2186 15944 2188 15962 2194 15968
2198 15978 2206 15980 2207 15980 2216 15974
2224 15958 2222 15952 2225 15949 2224 15943
FLASH FLOOD...RADAR INDICATED
$$
GIBBS2 follow-up statements
146
WGHW70 PHFO 110606
FFSHFO
Flash Flood Statement
National Weather Service Honolulu HI
806 PM HST Wed Mar 10 2021
HIC007-110730-
/O.CON.PHFO.FF.W.0023.000000T0000Z-210311T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Kauai HI-
806 PM HST Wed Mar 10 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 930 PM HST THIS
EVENING FOR THE ISLAND OF KAUAI IN KAUAI COUNTY...
At 806 PM HST, radar indicated moderate to heavy rain over east and
southeast facing slopes of Kauai, from Poipu to Lihue to Anahola.
Rain was falling at a rate of around 1 inch per hour, and area
streams remain elevated.
HAZARD...Flash flooding caused by heavy rain.
SOURCE...Radar indicated.
IMPACT...Flooding in drainages, streams, rivers, roads,
properties, and other low-lying areas. Public road
closures possible in some areas. Landslides are possible
in steep terrain.
Some locations that will experience flash flooding include...
Lihue, Kapaa, Kalaheo, Kekaha, Princeville, Kilauea, North Fork
Wailua Trails, Alakai Swamp Trails, Lawai, Omao, Kokee State Park,
Wailua Homesteads, Hanalei, Hanapepe, Wainiha, Na Pali State Park,
Koloa, Haena, Waimea and Wailua.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Stay away from streams, rivers, drainage ditches, and culverts, even
if they are currently dry.
Do not cross fast flowing or rising water in your vehicle, or on
foot. Turn around, don't drown.
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
The heavy rains may cause rock and mudslides in steep terrain areas.
&&
This warning may need to be extended beyond 930 PM HST if flooding
persists.
LAT...LON 2225 15940 2222 15933 2216 15930 2215 15928
2205 15932 2196 15932 2195 15934 2193 15934
2190 15938 2186 15944 2188 15962 2194 15968
2198 15978 2206 15980 2207 15980 2216 15974
2224 15958 2222 15952 2225 15949 2224 15943
FLASH FLOOD...RADAR INDICATED
$$
JELSEMA442
WGHW70 PHFO 110721
FFSHFO
Flash Flood Statement
National Weather Service Honolulu HI
921 PM HST Wed Mar 10 2021
HIC007-110731-
/O.EXP.PHFO.FF.W.0023.000000T0000Z-210311T0730Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Kauai HI-
921 PM HST Wed Mar 10 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 930 PM HST THIS EVENING FOR
THE ISLAND OF KAUAI IN KAUAI COUNTY...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
A Flash Flood Watch remains in effect until 600 PM HST Friday.
LAT...LON 2225 15940 2222 15933 2216 15930 2215 15928
2205 15932 2196 15932 2195 15934 2193 15934
2190 15938 2186 15944 2188 15962 2194 15968
2198 15978 2206 15980 2207 15980 2216 15974
2224 15958 2222 15952 2225 15949 2224 15943
$$
JELSEMAThe office that day
Everything else NWS Honolulu, HI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 10, 2:36 PM HST | Flash Flood Warning | HFO | Honolulu | 97 min |
| Mar 10, 3:00 PM HST | Special Marine Warning | HFO | 2 hr | |
| Mar 10, 3:11 PM HST | Small Craft Advisory | HFO | 13 hr | |
| Mar 10, 3:45 PM HST | Areal Flood Advisory | HFO | Kalawao | 3 hr |
| Mar 10, 4:13 PM HST | Areal Flood Advisory | HFO | Honolulu | 2 hr |
| Mar 10, 4:30 PM HST | Areal Flood Advisory | HFO | Hawaii | 2 hr |
| Mar 10, 4:36 PM HST | Special Weather Statement | HFO | Kauai | 24 min |
| Mar 10, 4:37 PM HST | Special Marine Warning | HFO | 113 min | |
| Mar 10, 4:58 PM HST | Areal Flood Advisory | HFO | Honolulu | 3 hr |
| Mar 10, 6:22 PM HST | Flash Flood Warning | HFO | Honolulu | 5 hr |
| Mar 10, 6:34 PM HST | Special Marine Warning | HFO | 25 min | |
| Mar 10, 8:05 PM HST | Special Marine Warning | HFO | 46 min | |
| Mar 10, 8:12 PM HST | Special Marine Warning | HFO | 2 hr | |
| Mar 10, 9:18 PM HST | Special Marine Warning | HFO | 76 min | |
| Mar 10, 9:27 PM HST | Areal Flood Advisory | HFO | Honolulu | 86 min |
| Mar 10, 11:04 PM HST | Special Marine Warning | HFO | 116 min | |
| Mar 11, 2:23 AM HST | Areal Flood Advisory | HFO | Honolulu | 7 hr |
| Mar 11, 2:39 AM HST | Special Marine Warning | HFO | 2 hr | |
| Mar 11, 3:21 AM HST | Areal Flood Advisory | HFO | Kauai | 9 hr |
| Mar 11, 3:47 AM HST | Special Weather Statement | HFO | Kauai | 43 min |
| Mar 11, 1:39 PM HST | Areal Flood Advisory | HFO | Honolulu | 43 min |
Nearby
Flash Flood Warnings in Hawaii, 2021Every flash flood warning in 2021
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.