Alert archive / Alaska / Storm Warnings in 2020
Storm Warning 196, NWS Anchorage, AK
NWS Anchorage, AK issued this storm warning at Dec 8, 2020, 3:38 PM AKST. It was in force for 59 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 8, 2020, 3:38 PM AKST (00:38 UTC)
- Expired
- Dec 11, 2020, 3:03 AM AKST
- In force
- 59 hr
- Issued by
- NWS Anchorage, AK
The text
As transmitted.
466 FZAK62 PAFC 090038 OFFALU Offshore Waters Forecast National Weather Service Anchorage AK 338 PM AKST Tue Dec 8 2020 Offshore Waters Forecast for the Bering Sea Wind forecasts reflect the predominant speed and direction expected. Sea forecasts represent an average of the highest one-third of the combined wind wave and swell height. PKZ499-091500- 338 PM AKST Tue Dec 8 2020 .SYNOPSIS FOR CENTRAL BERING SEA... A 991 mb low at 57N 161W moves into the Alaska Peninsula at 1001 mb by Wed morning. Its front moves into Southwest Alaska for Wed afternoon. A strong 976 mb low near 49N 171E becomes a 971 mb gale force low complex at 52N 177E by Thu afternoon. Its front pushes across the Aleutians through Thu afternoon. $$ PKZ411-091500- Bering Sea Offshore West of 180 and East of the International Dateline- 338 PM AKST Tue Dec 8 2020 ...STORM WARNING WEDNESDAY AND WEDNESDAY NIGHT... .TONIGHT...SE wind 15 to 30 kt becoming E 25 to 40 kt after midnight. Seas 7 to 12 ft. .WED...E wind 35 to 50 kt. Seas 13 to 21 ft. Snow and rain showers. .WED NIGHT...E wind 35 to 50 kt. Seas 19 to 30 ft. Widespread snow and rain showers. .THU...E wind 40 to 55 kt. Seas 21 to 36 ft. .THU NIGHT...E wind 30 to 45 kt. Seas 17 to 32 ft. .FRI...NE wind 20 to 35 kt. Seas 15 to 23 ft. .SAT...N wind 10 to 20 kt. Seas 8 to 11 ft. .SUN...NW wind 10 to 25 kt. Seas 9 to 12 ft. $$ PKZ412-091500- Bering Sea Offshore 171W to 180 and North of 56N- 338 PM AKST Tue Dec 8 2020 ...STORM WARNING WEDNESDAY NIGHT... .TONIGHT...NE wind up to 15 kt becoming E 10 to 25 kt after midnight. Seas 5 to 8 ft. .WED...E wind 15 to 30 kt increasing to 25 to 40 kt in the afternoon. Seas 7 to 12 ft. .WED NIGHT...E wind 30 to 45 kt increasing to 40 to 55 kt after midnight. Seas 12 to 20 ft building to 15 to 30 ft after midnight. .THU...E wind 40 to 55 kt. Seas 21 to 34 ft. .THU NIGHT...E wind 35 to 50 kt. Seas 15 to 30 ft. .FRI...E wind 15 to 25 kt. Seas 13 to 21 ft. .SAT...NE wind 10 to 25 kt. Seas 8 to 11 ft. .SUN...NW wind 10 to 20 kt. Seas 9 ft. $$ PKZ413-091500- Bering Sea Offshore 171W to 180 and South of 56N- 338 PM AKST Tue Dec 8 2020 ...STORM WARNING WEDNESDAY AND WEDNESDAY NIGHT... .TONIGHT...E wind 10 to 25 kt increasing to 25 to 40 kt after midnight. Seas 6 to 9 ft. .WED...E wind 35 to 50 kt. Seas 11 to 19 ft. Snow and rain. .WED NIGHT...E wind 40 to 55 kt. Seas 15 to 26 ft building to 23 to 33 ft after midnight. Snow and rain. .THU...SE wind 30 to 45 kt. Seas 15 to 30 ft. .THU NIGHT...SE wind 15 to 25 kt. Seas 11 to 18 ft. .FRI...SE wind 10 to 25 kt. Seas 8 to 16 ft. .SAT THROUGH SUN...NW wind 10 to 25 kt. Seas 7 to 11 ft. $$ PKZ414-091500- Bering Sea Offshore East of 171W- 338 PM AKST Tue Dec 8 2020 ...STORM WARNING WEDNESDAY NIGHT... .TONIGHT...N wind 15 to 30 kt. Seas 7 to 12 ft. Freezing spray. .WED...NE wind 10 to 20 kt becoming E 15 to 30 kt in the afternoon. Seas 6 to 9 ft. Freezing spray. .WED NIGHT...E wind 35 to 50 kt. Seas 6 to 11 ft building to 9 to 17 ft after midnight. Freezing spray. .THU...E wind 30 to 45 kt. Seas 12 to 20 ft. .THU NIGHT...SE wind 30 to 45 kt. Seas 11 to 19 ft. .FRI THROUGH SAT...SE wind 15 to 30 kt. Seas 8 to 13 ft. .SUN...NW wind up to 20 kt. Seas 5 to 9 ft. $$
5 follow-up statements
431 FZAK62 PAFC 091247 OFFALU Offshore Waters Forecast National Weather Service Anchorage AK 347 AM AKST Wed Dec 9 2020 Offshore Waters Forecast for the Bering Sea Wind forecasts reflect the predominant speed and direction expected. Sea forecasts represent an average of the highest one-third of the combined wind wave and swell height. PKZ499-100200- 347 AM AKST Wed Dec 9 2020 .SYNOPSIS FOR CENTRAL BERING SEA... High pressure over the Central/Eastern Bering through tomorrow night. A 970 mb storm force low at 49N 172E today moves to 50N 176E on Thursday. Its front pushes across the Bering through Thursday night. $$ PKZ411-100200- Bering Sea Offshore West of 180 and East of the International Dateline- 347 AM AKST Wed Dec 9 2020 ...STORM WARNING THROUGH THURSDAY... .TODAY...E wind 35 to 50 kt. Seas 14 to 22 ft. Widespread snow and rain showers. .TONIGHT...E wind 35 to 50 kt. Seas 20 to 32 ft. Widespread snow and rain showers. .THU...E wind 40 to 55 kt. Seas 21 to 36 ft. Snow showers and rain showers. .THU NIGHT...E wind 35 to 50 kt. Seas 17 to 32 ft. .FRI...E wind 15 to 30 kt. Seas 13 to 21 ft. .SAT THROUGH SUN...N wind 10 to 25 kt. Seas 9 to 14 ft. $$ PKZ412-100200- Bering Sea Offshore 171W to 180 and North of 56N- 347 AM AKST Wed Dec 9 2020 ...STORM WARNING TONIGHT AND THURSDAY... .TODAY...E wind 15 to 30 kt increasing to 25 to 40 kt in the afternoon. Seas 7 to 12 ft. .TONIGHT...E wind 30 to 45 kt increasing to 40 to 55 kt after midnight. Seas 12 to 20 ft building to 16 to 31 ft after midnight. .THU...E wind 45 to 55 kt diminishing to 35 to 50 kt in the afternoon. Seas 22 to 34 ft. Snow. .THU NIGHT...E wind 35 to 50 kt. Seas 16 to 31 ft. .FRI THROUGH SUN...NE wind 10 to 25 kt. Seas 10 to 18 ft. $$ PKZ413-100200- Bering Sea Offshore 171W to 180 and South of 56N- 347 AM AKST Wed Dec 9 2020 ...STORM WARNING THROUGH TONIGHT... .TODAY...E wind 35 to 50 kt. Seas 11 to 19 ft. Snow and rain. .TONIGHT...E wind 50 kt becoming 40 to 55 kt after midnight. Seas 16 to 31 ft. Snow and rain. .THU...SE wind 30 to 45 kt diminishing to 10 to 25 kt in the afternoon. Seas 14 to 29 ft. Rain and snow. .THU NIGHT...SE wind 10 to 25 kt. Seas 12 to 18 ft. .FRI...E wind 10 to 25 kt. Seas 8 to 16 ft. .SAT THROUGH SUN...NW wind up to 20 kt. Seas 7 to 12 ft. $$ PKZ414-100200- Bering Sea Offshore East of 171W- 347 AM AKST Wed Dec 9 2020 ...STORM WARNING TONIGHT... .TODAY...NE wind 10 to 20 kt becoming E 15 to 30 kt in the afternoon. Seas 5 to 8 ft. Freezing spray. .TONIGHT...E wind 35 to 50 kt. Seas 7 to 12 ft building to 10 to 18 ft after midnight. Freezing spray. .THU...E wind 30 to 45 kt. Seas 12 to 20 ft. Freezing spray. Snow and rain. .THU NIGHT...SE wind 30 to 45 kt. Seas 12 to 20 ft. .FRI THROUGH SAT...NE wind 20 to 35 kt. Seas 8 to 16 ft. .SUN...N wind 10 to 25 kt. Seas 6 to 11 ft. $$
493 FZAK62 PAFC 100041 OFFALU Offshore Waters Forecast National Weather Service Anchorage AK 341 PM AKST Wed Dec 9 2020 Offshore Waters Forecast for the Bering Sea Wind forecasts reflect the predominant speed and direction expected. Sea forecasts represent an average of the highest one-third of the combined wind wave and swell height. PKZ499-101500- 341 PM AKST Wed Dec 9 2020 .SYNOPSIS FOR CENTRAL BERING SEA... A 971 mb low at 50N 174E moves to 52N 178E Thu afternoon then shifts to 56N 174E at 981 mb Fri afternoon. Its front sweeps over the Aleutians and Bering to stall in the Eastern Aleutians for Thu afternoon. A strong North Pacific low moves along the front to 51N 161W at 964 mb by Fri afternoon. $$ PKZ411-101500- Bering Sea Offshore West of 180 and East of the International Dateline- 341 PM AKST Wed Dec 9 2020 ...STORM WARNING THROUGH THURSDAY NIGHT... .TONIGHT...E wind 40 to 55 kt. Gusts to 70 kt. Seas 21 to 34 ft. Widespread snow and rain showers. .THU...E wind 40 to 55 kt. Gusts to 70 kt. Seas 22 to 37 ft. Widespread snow and rain showers. .THU NIGHT...E wind 35 to 50 kt with gusts to 65 kt diminishing to 25 to 40 kt after midnight. Seas 17 to 32 ft. .FRI...E wind 15 to 30 kt. Seas 13 to 21 ft. .FRI NIGHT...E wind 10 to 25 kt. Seas 9 to 17 ft. .SAT THROUGH MON...NE wind up to 20 kt. Seas 9 to 14 ft. $$ PKZ412-101500- Bering Sea Offshore 171W to 180 and North of 56N- 341 PM AKST Wed Dec 9 2020 ...STORM WARNING THROUGH THURSDAY NIGHT... .TONIGHT...E wind 35 to 50 kt increasing to 45 to 60 kt after midnight. Gusts to 75 kt. Seas 13 to 21 ft building to 17 to 32 ft after midnight. .THU...E wind 45 to 60 kt. Gusts to 75 kt. Seas 23 to 35 ft. Snow and widespread rain showers. .THU NIGHT...E wind 40 to 55 kt with gusts to 65 kt becoming SE 30 to 45 kt after midnight. Seas 17 to 32 ft. Snow. .FRI...E wind 20 to 30 kt. Seas 11 to 19 ft. .FRI NIGHT...E wind 15 to 25 kt. Seas 10 to 15 ft. .SAT THROUGH MON...N wind 10 to 25 kt. Seas 10 to 16 ft. $$ PKZ413-101500- Bering Sea Offshore 171W to 180 and South of 56N- 341 PM AKST Wed Dec 9 2020 ...STORM WARNING TONIGHT... .TONIGHT...E wind 45 to 60 kt. Gusts to 75 kt. Seas 17 to 32 ft. Snow and rain. .THU...SE wind 30 to 45 kt diminishing to 10 to 25 kt in the afternoon. Seas 14 to 29 ft. Rain. .THU NIGHT...SE wind 10 to 25 kt. Seas 12 to 18 ft. .FRI...SE wind 10 to 25 kt. Seas 9 to 16 ft. .FRI NIGHT...E wind up to 20 kt. Seas 7 to 12 ft. .SAT THROUGH MON...N wind up to 20 kt. Seas 8 to 13 ft. $$ PKZ414-101500- Bering Sea Offshore East of 171W- 341 PM AKST Wed Dec 9 2020 ...STORM WARNING THROUGH THURSDAY... .TONIGHT...E wind 35 to 50 kt. Gusts to 65 kt S of the Pribilofs late. Seas 7 to 12 ft building to 10 to 18 ft after midnight. Freezing spray. .THU...E wind 35 to 50 kt. with gusts to 65 kt W of 168W. Seas 12 to 20 ft. Freezing spray. .THU NIGHT...E wind 30 to 45 kt becoming SE 20 to 35 kt after midnight. Seas 12 to 20 ft. Rain and snow. .FRI...E wind 15 to 30 kt. Seas 8 to 13 ft. .FRI NIGHT...NE wind 20 to 35 kt. Seas 9 to 14 ft. .SAT THROUGH SUN...N wind 20 to 35 kt. Seas 8 to 13 ft. .MON...NW wind up to 20 kt. Seas 5 to 10 ft. $$
351 FZAK62 PAFC 101216 OFFALU Offshore Waters Forecast National Weather Service Anchorage AK 316 AM AKST Thu Dec 10 2020 Offshore Waters Forecast for the Bering Sea Wind forecasts reflect the predominant speed and direction expected. Sea forecasts represent an average of the highest one-third of the combined wind wave and swell height. PKZ499-110145- 316 AM AKST Thu Dec 10 2020 .SYNOPSIS FOR CENTRAL BERING SEA... A 971 mb storm force low at 50N 175E on Thursday becomes 977 mb at 53N 176E on Friday. Its front moves across the Bering through Friday. $$ PKZ411-110145- Bering Sea Offshore West of 180 and East of the International Dateline- 316 AM AKST Thu Dec 10 2020 ...STORM WARNING THROUGH TONIGHT... .TODAY...E wind 40 to 55 kt. Seas 22 to 37 ft. Rain and snow showers. .TONIGHT...E wind 35 to 50 kt diminishing to 15 to 30 kt after midnight. Seas 16 to 31 ft. .FRI...E wind 15 to 30 kt. Seas 13 to 21 ft. .FRI NIGHT...E wind 10 to 25 kt. Seas 9 to 16 ft. .SAT THROUGH SUN...NW wind 15 to 30 kt. Seas 9 to 13 ft. .MON...NE wind 15 to 30 kt. Seas 8 to 16 ft. $$ PKZ412-110145- Bering Sea Offshore 171W to 180 and North of 56N- 316 AM AKST Thu Dec 10 2020 ...STORM WARNING THROUGH TONIGHT... .TODAY...E wind 45 to 60 kt. Seas 23 to 36 ft. Rain and snow. .TONIGHT...E wind 35 to 50 kt becoming SE 20 to 35 kt after midnight. Seas 16 to 31 ft. Rain and snow. .FRI...E wind 15 to 30 kt. Seas 12 to 19 ft. Snow. .FRI NIGHT...E wind 15 to 30 kt. Seas 10 to 15 ft. .SAT THROUGH SUN...N wind 15 to 30 kt. Seas 9 to 13 ft. .MON...E wind 15 to 30 kt. Seas 8 to 13 ft. $$ PKZ413-110145- Bering Sea Offshore 171W to 180 and South of 56N- 316 AM AKST Thu Dec 10 2020 ...STORM WARNING TODAY... .TODAY...SE wind 35 to 50 kt diminishing to 15 to 30 kt in the afternoon. Seas 15 to 30 ft. .TONIGHT...SE wind 15 to 30 kt. Seas 12 to 18 ft. .FRI...SE wind 15 to 30 kt. Seas 9 to 16 ft. .FRI NIGHT...E wind up to 20 kt. Seas 7 to 12 ft. .SAT THROUGH SUN...NW wind 15 to 30 kt. Seas 9 to 15 ft. .MON...SW wind up to 20 kt. Seas 6 to 11 ft. $$ PKZ414-110145- Bering Sea Offshore East of 171W- 316 AM AKST Thu Dec 10 2020 ...STORM WARNING TODAY... .TODAY...E wind 35 to 50 kt. Seas 13 to 21 ft. Freezing spray. Rain and snow. .TONIGHT...SE wind 30 to 45 kt diminishing to 20 to 35 kt after midnight. Seas 12 to 20 ft. .FRI...E wind 20 to 35 kt. Seas 9 to 14 ft. .FRI NIGHT...NE wind 25 to 40 kt. Seas 9 to 17 ft. .SAT...E wind 25 to 40 kt. Seas 8 to 16 ft. .SUN THROUGH MON...S wind 10 to 25 kt. Seas 5 to 10 ft. $$
988 FZAK62 PAFC 110028 OFFALU Offshore Waters Forecast National Weather Service Anchorage AK 328 PM AKST Thu Dec 10 2020 Offshore Waters Forecast for the Bering Sea Wind forecasts reflect the predominant speed and direction expected. Sea forecasts represent an average of the highest one-third of the combined wind wave and swell height. PKZ499-111400- 328 PM AKST Thu Dec 10 2020 .SYNOPSIS FOR CENTRAL BERING SEA... A 972 mb low at 51N 177E will move to 55N 175E Fri afternoon then dissipates Sat. Its front moves across the northern Bering through Sat. A 975 mb low at 50N 159W on Fri will move to 59N 169W Sat. Its front moves across the Bering through Sat. $$ PKZ411-111400- Bering Sea Offshore West of 180 and East of the International Dateline- 328 PM AKST Thu Dec 10 2020 ...STORM WARNING TONIGHT... .TONIGHT...E wind 35 to 50 kt diminishing to 15 to 30 kt after midnight. Seas 16 to 31 ft. .FRI...SE wind 15 to 30 kt. Seas 13 to 21 ft. .FRI NIGHT...SE wind 10 to 25 kt. Seas 9 to 16 ft. .SAT...NW wind 10 to 25 kt. Seas 9 to 13 ft. .SAT NIGHT...NW wind 15 to 30 kt. Seas 9 to 15 ft. .SUN...NW wind 10 to 25 kt. Seas 9 to 13 ft. .MON THROUGH TUE...E wind 15 to 30 kt. Seas 8 to 16 ft. $$ PKZ412-111400- Bering Sea Offshore 171W to 180 and North of 56N- 328 PM AKST Thu Dec 10 2020 ...STORM WARNING TONIGHT... .TONIGHT...SE wind 35 to 50 kt diminishing to 15 to 30 kt after midnight. Seas 16 to 31 ft. Snow. .FRI...E wind 15 to 30 kt. Seas 11 to 18 ft. Rain and snow. .FRI NIGHT...E wind 15 to 30 kt. Seas 9 to 14 ft. Snow showers and rain. .SAT...NE wind up to 20 kt. Seas 10 ft. .SAT NIGHT...NW wind up to 15 kt. Seas 8 to 11 ft. .SUN...NW wind 15 to 30 kt. Seas 8 to 13 ft. .MON THROUGH TUE...E wind 15 to 30 kt. Seas 9 to 14 ft. $$ PKZ413-111400- Bering Sea Offshore 171W to 180 and South of 56N- 328 PM AKST Thu Dec 10 2020 .TONIGHT...SE wind 15 to 30 kt. Seas 11 to 17 ft. .FRI...SE wind 10 to 25 kt. Seas 9 to 15 ft. .FRI NIGHT...SE wind 10 to 15 kt. Seas 8 to 11 ft. Rain and snow. .SAT...W wind up to 20 kt. Seas 8 ft. .SAT NIGHT...W wind 15 to 30 kt. Seas 9 to 14 ft. .SUN...W wind 15 to 30 kt. Seas 10 to 15 ft. .MON...SW wind up to 20 kt. Seas 6 to 11 ft. .TUE...E wind 15 to 25 kt. Seas 10 to 15 ft. $$ PKZ414-111400- Bering Sea Offshore East of 171W- 328 PM AKST Thu Dec 10 2020 ...GALE WARNING TONIGHT AND FRIDAY NIGHT... .TONIGHT...SE wind 30 to 45 kt diminishing to 20 to 35 kt after midnight. Seas 11 to 19 ft. Snow. .FRI...E wind 15 to 30 kt. Seas 9 to 14 ft. .FRI NIGHT...NE wind 30 to 45 kt. Seas 9 to 17 ft. Snow and rain showers. .SAT...NE wind 25 to 40 kt. Seas 9 to 16 ft. .SAT NIGHT...S wind 10 to 25 kt. Seas 5 to 10 ft. .SUN...SW wind 10 to 25 kt. Seas 4 to 9 ft. .MON...S wind up to 20 kt. Seas 4 to 7 ft. .TUE...SE wind up to 20 kt. Seas 4 to 9 ft. $$
054 FZAK62 PAFC 111203 OFFALU Offshore Waters Forecast National Weather Service Anchorage AK 303 AM AKST Fri Dec 11 2020 Offshore Waters Forecast for the Bering Sea Wind forecasts reflect the predominant speed and direction expected. Sea forecasts represent an average of the highest one-third of the combined wind wave and swell height. PKZ499-120200- 303 AM AKST Fri Dec 11 2020 .SYNOPSIS FOR CENTRAL BERING SEA... A 977 mb low at 53N 176E on Friday moves to 55N 174E at 988 mb on Saturday. A 970 mb low at 49N 157W on Friday moves to 56N 163W at 977 mb on Saturday. $$ PKZ411-120200- Bering Sea Offshore West of 180 and East of the International Dateline- 303 AM AKST Fri Dec 11 2020 .TODAY...SE wind 15 to 30 kt. Seas 13 to 21 ft. .TONIGHT...SE wind 10 to 25 kt. Seas 8 to 16 ft. .SAT...SE wind up to 20 kt becoming NW 10 to 25 kt in the afternoon. Seas 8 to 13 ft. .SAT NIGHT...NW wind 15 to 30 kt. Seas 9 to 13 ft. .SUN...NW wind 10 to 25 kt. Seas 8 to 13 ft. .MON THROUGH TUE...SE wind 10 to 20 kt. Seas 9 to 17 ft. $$ PKZ412-120200- Bering Sea Offshore 171W to 180 and North of 56N- 303 AM AKST Fri Dec 11 2020 .TODAY...E wind 15 to 30 kt. Seas 11 to 18 ft. Rain. .TONIGHT...E wind 15 to 30 kt. Seas 9 to 14 ft. Rain and snow showers. .SAT...NE wind 10 to 20 kt. Seas 9 to 12 ft. .SAT NIGHT...NW wind up to 15 kt. Seas 7 to 12 ft. .SUN...NW wind up to 20 kt. Seas 7 to 12 ft. .MON...SE wind up to 15 kt. Seas 4 to 8 ft. .TUE...E wind 10 to 20 kt. Seas 9 to 14 ft. $$ PKZ413-120200- Bering Sea Offshore 171W to 180 and South of 56N- 303 AM AKST Fri Dec 11 2020 .TODAY...SE wind 10 to 25 kt. Seas 9 to 15 ft. .TONIGHT...SE wind 10 to 15 kt. Seas 6 to 10 ft. .SAT...W wind 10 to 20 kt. Seas 6 to 9 ft. .SAT NIGHT...W wind 15 to 30 kt. Seas 8 to 13 ft. .SUN...W wind 15 to 30 kt. Seas 9 to 14 ft. .MON THROUGH TUE...SE wind up to 20 kt. Seas 7 to 12 ft. $$ PKZ414-120200- Bering Sea Offshore East of 171W- 303 AM AKST Fri Dec 11 2020 ...GALE WARNING TONIGHT AND SATURDAY... .TODAY...E wind 15 to 30 kt. Seas 9 to 14 ft. Rain and snow showers. .TONIGHT...NE wind 30 to 45 kt. Seas 9 to 17 ft. Rain and snow. .SAT...NE wind 25 to 40 kt becoming SW 15 to 30 kt in the afternoon. Seas 9 to 16 ft. .SAT NIGHT...S wind 10 to 25 kt. Seas 5 to 10 ft. .SUN THROUGH MON...W wind up to 15 kt. Seas 4 to 9 ft. .TUE...S wind up to 15 kt. Seas 4 to 9 ft. $$
What forecasters said that day
The local office's own words before this storm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Anchorage, AK wrote its last area forecast discussion before this storm warning went out at Dec 8, 4:45 AM AKST, 10 hours 53 minutes earlier.
Area forecast discussion, Dec 8, 4:45 AM AKST, 10 hours 53 minutes before
Southcentral and Southwest Alaska Forecast Discussion National Weather Service Anchorage AK 445 AM AKST Tue Dec 8 2020 .ANALYSIS AND UPPER LEVELS... Broad longwave trough with weak surface reflection lingers over most of the state through Thursday afternoon. As the trough exits to the north, an upper-level ridge will set up over Southern Alaska through the end of the week. Heaviest precipitation will be along the Southcentral coast and will be mostly in the form of snow or a rain/snow mix. Additionally, drier conditions across Southwest by Wednesday night and Southcentral by Thursday night as the ridge pushes inland. Out west, a storm force front enters the Western Bering on Tuesday night. The parent low will remain south of the Aleutian Chain until Thursday, crossing over into the Southern Bering on Thursday afternoon. Multiple embedded surface lows rotate cyclonically around the parent low and across the Central/Western Bering. Ahead of the front, temperatures should be cold enough to keep precipitation as snow. Warmer air will encompass much of the Bering behind the front through the end of the week, resulting in mostly rain or a rain/snow mix. && .MODEL DISCUSSION... Models are in great overall synoptic agreement through the end of the week. On the smaller scales, models diverge slightly on the embedded lows within the storm force low west of the Aleutian Chain. All models solutions show a series of surface lows spinning up along the front where the temperature gradient is greatest, but differ on speed and location. && .AVIATION... PANC... IFR conditions starting this morning as a band of light snow passes over Anchorage today with lowered cloud ceilings and visibilities. Improvement to marginal conditions by this afternoon/evening. && .SHORT TERM FORECAST SOUTHCENTRAL ALASKA (Days 1 and 2)... Broad upper level cyclonic flow with embedded short waves will be the main upper level features driving the weather today/tonight. Things get more complicated in the lower levels as a surface low heads toward western Prince William Sound today and cold air advection spreads north up Cook Inlet. Snow will generally spread north across Southcentral this morning with cold advection and as the low to mid level flow become more southerly. This will bring measurable snowfall to the Anchorage Bowl and MAT-SU Valleys today. Snow will diminish across these areas this evening. The North Gulf Coast will generally see rain or a mix of rain and snow today and snow showers tonight as cold air finally moves over the area. Gusty southerly winds are expected across Cook Inlet and near Seward with pressure rises as the surface low lifts north Prince William Sound. On Wednesday, the upper low over Bristol Bay today lifts north over Southcentral Wednesday afternoon/night. This will likely bring increasing chances of snow/snow showers across the region. && .SHORT TERM FORECAST SOUTHWEST ALASKA (Days 1 through 3: Tuesday morning through Friday morning)... A vertically stacked low over Bristol Bay will gradually track eastward through Wednesday. Gusty northerly winds are still blowing along much of the coast, especially along the Kuskokwim Delta coast. Snow and blowing snow will gradually taper this morning as the low weakens and the majority of the precipitation dissipates. Some snow showers are likely across the interior Bristol Bay area, the Lower Kuskokwim Valley, and the foothills of the Alaska Range this evening as residual moisture tracks eastward with the low. Meanwhile for the Alaska Peninsula, snow and blowing snow conditions are still expected through the day today as gusty northerly flow persists. By Wednesday, clearer conditions are expected as a much colder airmass arrives from the north and an upper level ridge builds eastward through Thursday. A pattern change is expected by Friday with a return of warm southerly flow as a front associated with a storm force low in the Bering approaches the southwest coast. && .SHORT TERM FORECAST BERING SEA/ALEUTIANS (Days 1 through 3: Tuesday morning through Friday morning)... A developing storm force low south of the western Aleutians is visible on satellite imagery this morning. As this low tracks eastward, its associated front will extend across the Aleutian Chain, bringing storm force winds across the Bering waters through Thursday as it travels east. Model solutions seem to consistently agree in a rapid occlusion of this front, allowing precipitation to initially fall as a rain/snow mix over the western Aleutians tonight with a change to snow as colder air fills in on the backside of the low. Given the strong temperature gradient along the front, model solutions are suggesting several smaller lows will develop along the front as it reaches the central Aleutians by Wednesday night. Meanwhile the parent low will have evolved into a broad area of low pressure centered over the western Bering by Thursday. This system will allow active weather to persist through the end of the week. && .MARINE (Days 3 through 5 - Thursday through Saturday)... Bering: A well-developed Western Bering low merges with a North Pacific low, forming a new low that moves to the Central Bering by Sat. Its front sweeps to the Northeastern Bering by Sat. While model track and development are mixed, widespread high-end gale force winds and waves wraps the low and front through Sat. The rear flank winds over the Western and Central Aleutians moves South and dissipate Sat as the low weakens. Gulf of Alaska: A weakening low moves across the Northern Gulf through Thu night. Model track and development vary, but lingering gap winds bring northwesterly small craft winds and waves over the Barren Island into the Western Gulf diminishing Thu. A front extending across the Alaska Peninsula into the North Pacific moves into the Gulf through Sat. A well-developed North Pacific low moves along the front to the extreme southwest corner of the Gulf. Widespread high-end southeast gale force winds move into the Gulf becoming easterly across Kodiak Island and the Gulf by Sat. && .LONG TERM FORECAST (Days 3 through 7)... Models are in decent agreement on a broad vertically stacked low near the western Aleutians early on Friday with a weakening front draped across the central/eastern Bering and Aleutians. On Saturday the Aleutians/Bering storm continues to gradually weaken, with a new storm system lifting out of the North Pacific towards the Alaska Peninsula. There is significant disagreement as to whether this low will bring a front towards the Northern Gulf Coast, or keeps its impacts primarily just limited to Kodiak and the AKPEN. On Sunday this new low looks to retrograde and merge with the broader low centered in the Bering, with a fairly quiet pattern setting up for Southcentral which will persist into Monday. && .AFC WATCHES/WARNINGS/ADVISORIES... PUBLIC...Winter Weather Advisory: 181 MARINE...Storm: 411, 413, 175, 176 Gale: 412, 414, 132, 155, 172, 173, 174, 177, 178, 180 Heavy Freezing Spray: 160, 180, 181 FIRE WEATHER...NONE. && SYNOPSIS AND MODEL DISCUSSION...KM SOUTHCENTRAL ALASKA...RMC SOUTHWEST ALASKA/BERING SEA/ALEUTIANS...KO MARINE/LONG TERM...KZ/BG
In the hours before
Special weather statement, Dec 8, 2:53 PM AKST, 45 minutes before
SPECIAL WEATHER STATEMENT National Weather Service ANCHORAGE AK 253 PM AKST Tue Dec 8 2020 AKZ125-091300- Western Prince William Sound- Including the cities of Whittier, Seward, Girdwood, and Moose Pass 253 PM AKST Tue Dec 8 2020 ...HEAVY SNOW LIKELY ALONG THE SEWARD HIGHWAY FROM MOOSE PASS TO SEWARD FOR WEDNESDAY... Snow is expected to develop Wednesday morning across the southern Kenai Peninsula with bands of locally heavy snow at times through late Wednesday afternoon. Snowfall rates of 1 to 2 inches per hour are possible along the Seward Highway from Moose Pass to Seward in the heavier snow bands with visibility dropping to as low as one quarter mile. Up to one foot of snow, with locally higher amounts, is possible before the snow tapers off late Wednesday evening. For the latest road conditions call 5 1 1 or visit 511.alaska.gov.
The office that day
Everything else NWS Anchorage, AK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 8, 3:30 PM AKST | Small Craft Advisory | AFC | 36 hr | |
| Dec 8, 3:30 PM AKST | Heavy Freezing Spray Warning | AFC | 48 hr | |
| Dec 8, 3:49 PM AKST | Gale Warning | AFC | 59 hr | |
| Dec 8, 3:49 PM AKST | Small Craft Advisory | AFC | 12 hr | |
| Dec 8, 3:49 PM AKST | Storm Warning | AFC | 35 hr | |
| Dec 9, 3:11 AM AKST | Gale Warning | AFC | 36 hr | |
| Dec 9, 3:11 AM AKST | Gale Warning | AFC | 24 hr | |
| Dec 9, 3:47 AM AKST | Gale Warning | AFC | 4 days | |
| Dec 9, 3:47 AM AKST | Storm Warning | AFC | 47 hr | |
| Dec 9, 3:47 AM AKST | Heavy Freezing Spray Warning | AFC | 3 days | |
| Dec 9, 6:48 AM AKST | Storm Warning | AFC | 9 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.