Alert archive / Hawaii / Blizzard Warnings in 2021
Blizzard Warning 1, NWS Honolulu, HI
NWS Honolulu, HI issued this blizzard warning at Dec 2, 2021, 3:26 PM HST for Hawaii County, Hawaii. It took effect at Dec 3, 2021, 3:46 PM HST. It was in force for 60 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Dec 2, 2021, 3:26 PM HST (01:26 UTC)
- In effect from
- Dec 3, 2021, 3:46 PM HST
- Expired
- Dec 6, 2021, 3:24 AM HST
- In force
- 60 hr
- Issued by
- NWS Honolulu, HI
County Hawaii County, HI
The radar
The South Shore radar (PHWA), 57 km from the middle of the area, began a volume at 01:30 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, 1.4 hours before the alert went out and 56 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
- 492 J/kg
- Mixed-layer CIN
- -32 J/kg
- Mixed-layer LCL
- 941 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 38 m²/s²
- 0-3 km storm-relative helicity
- 76 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
888 WWHW40 PHFO 030126 WSWHFO URGENT - WINTER WEATHER MESSAGE National Weather Service Honolulu HI 326 PM HST Thu Dec 2 2021 ...BLIZZARD WARNING FOR THE BIG ISLAND SUMMITS... HIZ028-031430- /O.UPG.PHFO.WS.A.0004.211204T0400Z-211205T1600Z/ /O.NEW.PHFO.BZ.W.0001.211204T0400Z-211205T1600Z/ Big Island Summits- 326 PM HST Thu Dec 2 2021 ...BLIZZARD WARNING IN EFFECT FROM 6 PM FRIDAY TO 6 AM HST SUNDAY... * WHAT...Blizzard conditions expected. Total snow accumulations of up to 12 inches or more. Winds gusting over 100 mph. * WHERE...Big Island Summits. * WHEN...From 6 PM Friday to 6 AM HST Sunday. * IMPACTS...Travel could be very difficult to impossible. Blowing snow will significantly reduce visibility at times, with periods of zero visibility. See the High Wind Warning that is also in effect. * ADDITIONAL DETAILS...The strong winds will likely cause significant drifting of snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... Travel should be restricted to emergencies only. If you must travel, have a winter survival kit with you. If you get stranded, stay with your vehicle. && $$ Burke
7 follow-up statements
892 WWHW40 PHFO 031311 WSWHFO URGENT - WINTER WEATHER MESSAGE National Weather Service Honolulu HI 311 AM HST Fri Dec 3 2021 ...BLIZZARD WARNING FOR THE BIG ISLAND SUMMITS... HIZ028-040215- /O.CON.PHFO.BZ.W.0001.211204T0400Z-211205T1600Z/ Big Island Summits- 311 AM HST Fri Dec 3 2021 ...BLIZZARD WARNING REMAINS IN EFFECT FROM 6 PM THIS EVENING TO 6 AM HST SUNDAY... * WHAT...Blizzard conditions expected. Total snow accumulations of up to 12 inches or more. Winds gusting over 100 mph. * WHERE...Big Island Summits. * WHEN...From 6 PM this evening to 6 AM HST Sunday. * IMPACTS...Travel could be very difficult to impossible. Blowing snow will significantly reduce visibility at times, with periods of zero visibility. See the High Wind Warning that is also in effect. * ADDITIONAL DETAILS...The strong winds will likely cause significant drifting of snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... Travel should be restricted to emergencies only. If you must travel, have a winter survival kit with you. If you get stranded, stay with your vehicle. && $$
474 WWHW40 PHFO 040146 WSWHFO URGENT - WINTER WEATHER MESSAGE National Weather Service Honolulu HI 346 PM HST Fri Dec 3 2021 ...BLIZZARD WARNING FOR THE BIG ISLAND SUMMITS... HIZ028-041500- /O.EXT.PHFO.BZ.W.0001.211204T0146Z-211205T1600Z/ Big Island Summits- 346 PM HST Fri Dec 3 2021 ...BLIZZARD WARNING NOW IN EFFECT UNTIL 6 AM HST SUNDAY... * WHAT...Blizzard conditions expected. Total snow accumulations of up to 12 inches or more. Winds gusting over 100 mph. * WHERE...Big Island Summits. * WHEN...Until 6 AM HST Sunday. * IMPACTS...Travel could be very difficult to impossible. Blowing snow will significantly reduce visibility at times, with periods of zero visibility. See the High Wind Warning that is also in effect. * ADDITIONAL DETAILS...The strong winds will likely cause significant drifting of snow. PRECAUTIONARY/PREPAREDNESS ACTIONS... Travel should be restricted to emergencies only. If you must travel, have a winter survival kit with you. If you get stranded, stay with your vehicle. && $$
526 WWHW40 PHFO 041343 WSWHFO URGENT - WINTER WEATHER MESSAGE National Weather Service Honolulu HI 343 AM HST Sat Dec 4 2021 ...BLIZZARD WARNING FOR THE BIG ISLAND SUMMITS... HIZ028-050245- /O.CON.PHFO.BZ.W.0001.000000T0000Z-211205T1600Z/ Big Island Summits- 343 AM HST Sat Dec 4 2021 ...BLIZZARD WARNING REMAINS IN EFFECT UNTIL 6 AM HST SUNDAY... * WHAT...Blizzard conditions expected. Total snow accumulations of up to 12 inches or more. Winds gusting over 100 mph. * WHERE...Big Island Summits. * WHEN...Until 6 AM HST Sunday. * IMPACTS...Travel could be very difficult to impossible. Blowing snow will significantly reduce visibility at times, with periods of zero visibility. See the High Wind Warning that is also in effect. PRECAUTIONARY/PREPAREDNESS ACTIONS... Travel should be restricted to emergencies only. If you must travel, have a winter survival kit with you. If you get stranded, stay with your vehicle. && $$
163 WWHW40 PHFO 050125 WSWHFO URGENT - WINTER WEATHER MESSAGE National Weather Service Honolulu HI 325 PM HST Sat Dec 4 2021 ...BLIZZARD WARNING FOR THE BIG ISLAND SUMMITS... HIZ028-051430- /O.CON.PHFO.BZ.W.0001.000000T0000Z-211205T1600Z/ Big Island Summits- 325 PM HST Sat Dec 4 2021 ...BLIZZARD WARNING REMAINS IN EFFECT UNTIL 6 AM HST SUNDAY... * WHAT...Blizzard conditions. Additional snow accumulations of up to 8 inches. Winds gusting as high as 125 mph. * WHERE...Big Island Summits. * WHEN...Until 6 AM HST Sunday. * IMPACTS...Travel could be very difficult. Blowing snow will significantly reduce visibility at times, with periods of zero visibility. PRECAUTIONARY/PREPAREDNESS ACTIONS... Travel should be restricted to emergencies only. If you must travel, have a winter survival kit with you. If you get stranded, stay with your vehicle. && $$ Birchard
108 WWHW40 PHFO 051332 WSWHFO URGENT - WINTER WEATHER MESSAGE National Weather Service Honolulu HI 332 AM HST Sun Dec 5 2021 ...BLIZZARD WARNING FOR THE BIG ISLAND SUMMITS... HIZ028-060245- /O.EXT.PHFO.BZ.W.0001.000000T0000Z-211206T1600Z/ Big Island Summits- 332 AM HST Sun Dec 5 2021 ...BLIZZARD WARNING NOW IN EFFECT UNTIL 6 AM HST MONDAY... * WHAT...Blizzard conditions. Additional snow accumulations of up to 8 inches. Winds gusting as high as 125 mph. * WHERE...Big Island Summits. * WHEN...Until 6 AM HST Monday. * IMPACTS...Travel could be very difficult. Blowing snow will significantly reduce visibility at times, with periods of zero visibility. PRECAUTIONARY/PREPAREDNESS ACTIONS... Travel should be restricted to emergencies only. If you must travel, have a winter survival kit with you. If you get stranded, stay with your vehicle. && $$ Gibbs
522 WWHW40 PHFO 060139 WSWHFO URGENT - WINTER WEATHER MESSAGE National Weather Service Honolulu HI 339 PM HST Sun Dec 5 2021 ...BLIZZARD WARNING FOR THE BIG ISLAND SUMMITS... HIZ028-061445- /O.CON.PHFO.BZ.W.0001.000000T0000Z-211206T1600Z/ Big Island Summits- 339 PM HST Sun Dec 5 2021 ...BLIZZARD WARNING REMAINS IN EFFECT UNTIL 6 AM HST MONDAY... * WHAT...Blizzard conditions. Additional snow accumulations of 4 to 6 inches. Winds gusting as high as 80 mph. * WHERE...Big Island Summits. * WHEN...Until 6 AM HST Monday. * IMPACTS...Travel will be dangerous, and the road to the summit remains closed. Blowing snow will significantly reduce visibility at times, with periods of zero visibility. PRECAUTIONARY/PREPAREDNESS ACTIONS... Travel should be restricted to emergencies only. If you must travel, have a winter survival kit with you. If you get stranded, stay with your vehicle. && $$ Wroe
045 WWHW40 PHFO 061324 WSWHFO URGENT - WINTER WEATHER MESSAGE National Weather Service Honolulu HI 324 AM HST Mon Dec 6 2021 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL 6 PM HST THIS EVENING FOR THE BIG ISLAND SUMMITS ABOVE 12000 FEET ELEVATION... HIZ028-070230- /O.CAN.PHFO.BZ.W.0001.000000T0000Z-211206T1600Z/ /O.NEW.PHFO.WW.Y.0013.211206T1324Z-211207T0400Z/ Big Island Summits- 324 AM HST Mon Dec 6 2021 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL 6 PM HST THIS EVENING... ...BLIZZARD WARNING IS CANCELLED... * WHAT...Snow. Additional snow accumulations of up to 4 inches are forecast. * WHERE...Mauna Kea and Mauna Loa summits above 12,000 feet elevation. * WHEN...Until 6 PM HST this evening. * IMPACTS...Plan on slippery road conditions. Blowing snow will significantly reduce visibility at times, with periods of zero visibility. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Winter Weather Advisory means that periods of snow, sleet, or freezing rain will cause travel difficulties. Be prepared for slippery roads and limited visibilities and use caution while driving. && $$ RCB
The office that day
Everything else NWS Honolulu, HI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 2, 3:04 PM HST | Flood Watch | HFO | Hawaii, Honolulu, Kauai, Kalawao | 5 days |
| Dec 2, 3:24 PM HST | Areal Flood Advisory | HFO | Kauai | 3 hr |
| Dec 2, 3:26 PM HST | High Wind Warning | HFO | Hawaii, Kalawao | 3 days |
| Dec 2, 3:26 PM HST | Wind Advisory | HFO | Kauai, Kalawao | 44 hr |
| Dec 2, 3:32 PM HST | Gale Warning | HFO | 30 hr | |
| Dec 2, 3:32 PM HST | Small Craft Advisory | HFO | 14 days | |
| Dec 2, 4:02 PM HST | Areal Flood Advisory | HFO | Hawaii | 3 hr |
| Dec 3, 5:16 AM HST | Areal Flood Advisory | HFO | Kalawao | 3 hr |
| Dec 3, 9:08 AM HST | High Surf Warning | HFO | Hawaii, Honolulu, Kauai, Kalawao | 66 hr |
| Dec 3, 9:08 AM HST | High Surf Advisory | HFO | Hawaii, Honolulu, Kauai, Kalawao | 66 hr |
| Dec 3, 1:32 PM HST | Areal Flood Advisory | HFO | Kalawao | 3 hr |
Nearby
Blizzard Warnings in Hawaii, 2021Every blizzard 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.