Alert archive / Hawaii / Wind Advisories in 2021
Wind Advisory 15, NWS Honolulu, HI
NWS Honolulu, HI issued this wind advisory at Jul 31, 2021, 8:30 PM HST for Hawaii County, Kalawao County, Hawaii. It took effect at Aug 1, 2021, 6:00 AM HST. It was in force for 11 hr.
The area
The counties it named.
The facts
- Issued
- Jul 31, 2021, 8:30 PM HST (06:30 UTC)
- In effect from
- Aug 1, 2021, 6:00 AM HST
- Expired
- Aug 1, 2021, 5:21 PM HST
- In force
- 11 hr
- Issued by
- NWS Honolulu, HI
Counties Hawaii County, HI, Kalawao County, HI
The radar
The Kamuela/Kohala Apt radar (PHKM), 57 km from the middle of the area, began a volume at 06:34 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 00:00Z, 6.5 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.
- Mixed-layer CAPE
- 7 J/kg
- Mixed-layer CIN
- -14 J/kg
- Mixed-layer LCL
- 1160 m above ground
- 0-6 km bulk shear
- 3 kt
- 0-1 km storm-relative helicity
- -4 m²/s²
- 0-3 km storm-relative helicity
- -67 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
827 WWHW70 PHFO 010630 NPWHFO URGENT - WEATHER MESSAGE National Weather Service Honolulu HI 830 PM HST Sat Jul 31 2021 ...WIND ADVISORY FOR PORTIONS OF THE BIG ISLAND MAUI AND LANAI DURING THE DAY ON SUNDAY... .Strong and gusty trade winds will build during the day on Sunday. Winds will ease slightly Sunday night and Monday. HIZ015-018-026-027-042-043-045-046-051-052-011930- /O.NEW.PHFO.WI.Y.0015.210801T1600Z-210802T0400Z/ Lanai Mauka-Maui Leeward West-Kohala-Big Island Interior- Lanai Windward-Lanai Leeward-Maui Central Valley North- Maui Central Valley South-Big Island South-Big Island Southeast- Including the cities of Lanai City, Lahaina, Kaanapali, Kawaihae, Waikoloa, Waikii, Puuanahulu, Bradshaw Field, Saddle Road Above 5000 feet, Shipwreck Beach, Kaumalapau Harbor, Kahului, Maalaea, Ocean View, South Point, and Pahala 830 PM HST Sat Jul 31 2021 ...WIND ADVISORY IN EFFECT FROM 6 AM TO 6 PM HST SUNDAY... * WHAT...Northeast winds 15 to 30 mph with localized gusts over 50 mph expected. * WHERE...Portions of Lanai, Maui, and the Big Island. * WHEN...From 6 AM to 6 PM HST Sunday. * IMPACTS...Winds this strong can tear off shingles, knock down tree branches, blow away tents and awnings and make it difficult to steer, especially for drivers of high profile vehicles. PRECAUTIONARY/PREPAREDNESS ACTIONS... Watch out for falling tree branches when walking or driving. Make sure tents and awnings are secure or take them down. Be prepared for power outages. && $$ Wroe
2 follow-up statements
750 WWHW70 PHFO 011320 NPWHFO URGENT - WEATHER MESSAGE National Weather Service Honolulu HI 320 AM HST Sun Aug 1 2021 ...WIND ADVISORY FOR PORTIONS OF THE BIG ISLAND MAUI AND LANAI... .Strong and gusty trade winds will build during the day. Winds will ease slightly Sunday night and Monday. HIZ015-018-026-027-042-043-045-046-051-052-020230- /O.CON.PHFO.WI.Y.0015.210801T1600Z-210802T0400Z/ Lanai Mauka-Maui Leeward West-Kohala-Big Island Interior- Lanai Windward-Lanai Leeward-Maui Central Valley North- Maui Central Valley South-Big Island South-Big Island Southeast- Including the cities of Lanai City, Lahaina, Kaanapali, Kawaihae, Waikoloa, Waikii, Puuanahulu, Bradshaw Field, Saddle Road Above 5000 feet, Shipwreck Beach, Kaumalapau Harbor, Kahului, Maalaea, Ocean View, South Point, and Pahala 320 AM HST Sun Aug 1 2021 ...WIND ADVISORY REMAINS IN EFFECT UNTIL 6 PM HST THIS EVENING... * WHAT...Northeast winds 15 to 30 mph with localized gusts over 50 mph expected. * WHERE...Portions of Lanai, Maui, and the Big Island. * WHEN...From 6 AM to 6 PM HST Sunday. * IMPACTS...Winds this strong can tear off shingles, knock down tree branches, blow away tents and awnings and make it difficult to steer, especially for drivers of high profile vehicles. PRECAUTIONARY/PREPAREDNESS ACTIONS... Watch out for falling tree branches when walking or driving. Make sure tents and awnings are secure or take them down. Be prepared for power outages. && $$ Wroe
621 WWHW70 PHFO 020321 NPWHFO URGENT - WEATHER MESSAGE National Weather Service Honolulu HI 521 PM HST Sun Aug 1 2021 ...WIND ADVISORY IS CANCELLED... HIZ015-018-026-027-042-043-045-046-051-052-020430- /O.CAN.PHFO.WI.Y.0015.000000T0000Z-210802T0400Z/ Lanai Mauka-Maui Leeward West-Kohala-Big Island Interior- Lanai Windward-Lanai Leeward-Maui Central Valley North- Maui Central Valley South-Big Island South-Big Island Southeast- Including the cities of Lanai City, Lahaina, Kaanapali, Kawaihae, Waikoloa, Waikii, Puuanahulu, Bradshaw Field, Saddle Road Above 5000 feet, Shipwreck Beach, Kaumalapau Harbor, Kahului, Maalaea, Ocean View, South Point, and Pahala 521 PM HST Sun Aug 1 2021 ...WIND ADVISORY IS CANCELLED... The strong trade winds have begun to diminish across the area. Thus the Wind Advisory has been cancelled. $$ Burke
The office that day
Everything else NWS Honolulu, HI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 31, 8:30 PM HST | Gale Warning | HFO | 21 hr |
Nearby
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.