Alert archive / Alaska / Winter Weather Advisories in 2021
Winter Weather Advisory 76, NWS Anchorage, AK
NWS Anchorage, AK issued this winter weather advisory at Dec 28, 2021, 4:29 AM AKST. It took effect at Dec 28, 2021, 1:04 PM AKST. It was in force for 15 hr.
The area
The counties it named.
The facts
- Issued
- Dec 28, 2021, 4:29 AM AKST (13:29 UTC)
- In effect from
- Dec 28, 2021, 1:04 PM AKST
- Expired
- Dec 29, 2021, 4:00 AM AKST
- In force
- 15 hr
- Issued by
- NWS Anchorage, AK
The text
As transmitted.
915 WWAK41 PAFC 281329 WSWAER URGENT - WINTER WEATHER MESSAGE National Weather Service Anchorage AK 429 AM AKST Tue Dec 28 2021 AKZ101-290200- /O.NEW.PAFC.WW.Y.0076.211229T0000Z-211229T1300Z/ Anchorage- Including the cities of Anchorage, Eagle River, Indian, and Eklutna 429 AM AKST Tue Dec 28 2021 ...WINTER WEATHER ADVISORY IN EFFECT FROM 3 PM THIS AFTERNOON TO 4 AM AKST WEDNESDAY... * WHAT...Freezing rain and snow expected. Total ice accumulations up to two tenths of an inch. Total snow accumulations up to 2 inches, mainly along the mountains. * WHERE...Anchorage. * WHEN...From 3 PM this afternoon to 4 AM AKST Wednesday. * IMPACTS...Travel could be extremely hazardous, including during the evening commute. Be prepared for slippery roads. * ADDITIONAL DETAILS...Areas of light freezing rain will develop this afternoon at lower elevations, then become heavier during the evening hours. Temperatures along the Anchorage Hillside and other higher elevations will be above freezing with southeast winds gusting to 35 mph and plain rain. Precipitation will change to snow for all areas around midnight, then quickly end from west to east. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. For the latest road conditions call 5 1 1 or visit 511.alaska.gov. && $$ AKZ111-290200- /O.NEW.PAFC.WW.Y.0076.211229T0000Z-211229T1300Z/ Matanuska Valley- Including the cities of Palmer, Wasilla, Sutton, and Chickaloon 429 AM AKST Tue Dec 28 2021 ...WINTER WEATHER ADVISORY IN EFFECT FROM 3 PM THIS AFTERNOON TO 4 AM AKST WEDNESDAY... * WHAT...Freezing rain and snow expected. Total ice accumulations of up to one quarter of an inch. Total snow accumulations of up to 4 inches, mainly north and east of Palmer. * WHERE...Matanuska Valley. * WHEN...From 3 PM this afternoon to 4 AM AKST Wednesday. * IMPACTS...Travel could be extremely hazardous, including during the evening commute. Be prepared for slippery roads. Ice accumulation may cause downed power lines and falling tree branches. * ADDITIONAL DETAILS...Areas of light freezing rain will develop this afternoon, then become heavier during the evening hours. Precipitation will change to snow during the late evening hours, then quickly end from west to east. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. For the latest road conditions call 5 1 1 or visit 511.alaska.gov. && $$ AKZ141-290200- /O.NEW.PAFC.WW.Y.0076.211229T0300Z-211229T1300Z/ Copper River Basin- Including the cities of Glennallen, Eureka, McCarthy, Paxson, and Slana 429 AM AKST Tue Dec 28 2021 ...WINTER WEATHER ADVISORY IN EFFECT FROM 6 PM THIS EVENING TO 4 AM AKST WEDNESDAY NORTH OF GAKONA... * WHAT...Snow expected. Total snow accumulations of 4 to 8 inches. * WHERE...North of Gakona, including Paxson, Chistochina and Slana. * WHEN...From 6 PM this evening to 4 AM AKST Wednesday. * IMPACTS...Plan on slippery road conditions. * ADDITIONAL DETAILS...The heaviest snow and highest snow accumulation will be close to the Alaska Range. This includes the Richardson Highway near Paxson and the Tok Cutoff from Chistochina to Mentasta Lake. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. For the latest road conditions call 5 1 1 or visit 511.alaska.gov. && $$ AKZ145-290200- /O.NEW.PAFC.WW.Y.0076.211229T0000Z-211229T0900Z/ Susitna Valley- Including the cities of Talkeetna, Willow, and Cantwell 429 AM AKST Tue Dec 28 2021 ...WINTER WEATHER ADVISORY IN EFFECT FROM 3 PM THIS AFTERNOON TO MIDNIGHT AKST TONIGHT FROM TALKEETNA SOUTHWARD... * WHAT...Freezing rain and snow expected. Total ice accumulations up to two tenths of an inch. Total snow accumulations of up to 2 inches. * WHERE...From Talkeetna southward in the Susitna Valley. * WHEN...From 3 PM this afternoon to midnight AKST tonight. * IMPACTS...Travel could be extremely hazardous, including during the evening commute. Be prepared for slippery roads. * ADDITIONAL DETAILS...Areas of light freezing rain will develop this afternoon, then become heavier heading into the evening hours. Precipitation will change to snow during the mid to late evening hours, then quickly end by midnight. For the Parks Highway corridor north of Talkeetna, precipitation is expected to fall mainly as snow, with 2 to 4 inches accumulation. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. For the latest road conditions call 5 1 1 or visit 511.alaska.gov. && $$ http://www.weather.gov/afc
4 follow-up statements
484 WWAK41 PAFC 282204 WSWAER URGENT - WINTER WEATHER MESSAGE National Weather Service Anchorage AK 104 PM AKST Tue Dec 28 2021 AKZ121-290600- /O.EXB.PAFC.WW.Y.0076.211228T2204Z-211229T0600Z/ Western Kenai Peninsula- Including the cities of Kenai, Soldotna, Homer, and Cooper Landing 104 PM AKST Tue Dec 28 2021 ...WINTER WEATHER ADVISORY IN EFFECT UNTIL 9 PM AKST THIS EVENING FROM KENAI EAST... * WHAT...Freezing rain occurring. Ice accumulations of up to one tenth of an inch. * WHERE...Western Kenai Peninsula from Kenai east, including Soldotna and Sterling. * WHEN...Until 9 PM AKST this evening. * IMPACTS...Travel could be extremely hazardous, including during the evening commute. Be prepared for slippery roads. * ADDITIONAL DETAILS...Areas of light freezing rain are developing this afternoon at lower elevations, then are expected to become heavier during the late afternoon. The precipitation will quickly end from west to east this evening. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. Prepare for possible power outages. For the latest road conditions call 5 1 1 or visit 511.alaska.gov. && $$ AKZ101-291115- /O.CON.PAFC.WW.Y.0076.211229T0000Z-211229T1300Z/ Anchorage- Including the cities of Anchorage, Eagle River, Indian, and Eklutna 104 PM AKST Tue Dec 28 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 4 AM AKST WEDNESDAY... * WHAT...Freezing rain and snow expected. Total ice accumulations up to two tenths of an inch. Total snow accumulations up to 2 inches, mainly along the mountains. * WHERE...Anchorage. * WHEN...From 3 PM this afternoon to 4 AM AKST Wednesday. * IMPACTS...Travel could be extremely hazardous, including during the evening commute. Be prepared for slippery roads. * ADDITIONAL DETAILS...Areas of light freezing rain will develop this afternoon at lower elevations, then become heavier during the evening hours. Temperatures along the Anchorage Hillside and other higher elevations will be above freezing with southeast winds gusting to 35 mph and plain rain. Precipitation will change to snow for all areas around midnight, then quickly end from west to east. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. For the latest road conditions call 5 1 1 or visit 511.alaska.gov. && $$ AKZ111-291115- /O.CON.PAFC.WW.Y.0076.211229T0000Z-211229T1300Z/ Matanuska Valley- Including the cities of Palmer, Wasilla, Sutton, and Chickaloon 104 PM AKST Tue Dec 28 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 4 AM AKST WEDNESDAY... * WHAT...Freezing rain and snow expected. Total ice accumulations of up to one quarter of an inch. Total snow accumulations of up to 4 inches, mainly north and east of Palmer. * WHERE...Matanuska Valley. * WHEN...From 3 PM this afternoon to 4 AM AKST Wednesday. * IMPACTS...Travel could be extremely hazardous, including during the evening commute. Be prepared for slippery roads. Ice accumulation may cause downed power lines and falling tree branches. * ADDITIONAL DETAILS...Areas of light freezing rain will develop this afternoon, then become heavier during the evening hours. Precipitation will change to snow during the late evening hours, then quickly end from west to east. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. For the latest road conditions call 5 1 1 or visit 511.alaska.gov. && $$ AKZ141-291115- /O.CON.PAFC.WW.Y.0076.211229T0300Z-211229T1300Z/ Copper River Basin- Including the cities of Glennallen, Eureka, McCarthy, Paxson, and Slana 104 PM AKST Tue Dec 28 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 6 PM THIS EVENING TO 4 AM AKST WEDNESDAY NORTH OF GAKONA... * WHAT...Snow expected. Total snow accumulations of 4 to 8 inches. * WHERE...North of Gakona, including Paxson, Chistochina and Slana. * WHEN...From 6 PM this evening to 4 AM AKST Wednesday. * IMPACTS...Plan on slippery road conditions. * ADDITIONAL DETAILS...The heaviest snow and highest snow accumulation will be close to the Alaska Range. This includes the Richardson Highway near Paxson and the Tok Cutoff from Chistochina to Mentasta Lake. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. For the latest road conditions call 5 1 1 or visit 511.alaska.gov. && $$ AKZ145-290900- /O.CON.PAFC.WW.Y.0076.211229T0000Z-211229T0900Z/ Susitna Valley- Including the cities of Talkeetna, Willow, and Cantwell 104 PM AKST Tue Dec 28 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT AKST TONIGHT... * WHAT...Freezing rain and snow expected. Total ice accumulations up to two tenths of an inch. Total snow accumulations of up to 2 inches. * WHERE...From Talkeetna southward in the Susitna Valley. * WHEN...From 3 PM this afternoon to midnight AKST tonight. * IMPACTS...Travel could be extremely hazardous, including during the evening commute. Be prepared for slippery roads. * ADDITIONAL DETAILS...Areas of light freezing rain will develop this afternoon, then become heavier heading into the evening hours. Precipitation will change to snow during the mid to late evening hours, then quickly end by midnight. For the Parks Highway corridor north of Talkeetna, precipitation is expected to fall mainly as snow, with 2 to 4 inches accumulation. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. For the latest road conditions call 5 1 1 or visit 511.alaska.gov. && $$ http://www.weather.gov/afc
206 WWAK41 PAFC 290046 WSWAER URGENT - WINTER WEATHER MESSAGE National Weather Service Anchorage AK 346 PM AKST Tue Dec 28 2021 AKZ101-291000- /O.EXT.PAFC.WW.Y.0076.000000T0000Z-211229T1000Z/ Anchorage- Including the cities of Anchorage, Eagle River, Indian, and Eklutna 346 PM AKST Tue Dec 28 2021 ...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL 1 AM AKST WEDNESDAY... * WHAT...Freezing rain and snow expected. Total ice accumulations up to two tenths of an inch. Total snow accumulations up to 2 inches, mainly along the mountains. * WHERE...Anchorage. * WHEN...Until 1 AM AKST Wednesday. * IMPACTS...Travel could be extremely hazardous, including during the evening commute. Be prepared for slippery roads. * ADDITIONAL DETAILS...Areas of light freezing rain will develop this afternoon at lower elevations, then become heavier during the evening hours. Temperatures along the Anchorage Hillside and other higher elevations will be above freezing with southeast winds gusting to 35 mph and plain rain. Precipitation will change to snow for all areas around midnight, then quickly end from west to east. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. For the latest road conditions call 5 1 1 or visit 511.alaska.gov. && $$ AKZ111-291000- /O.EXT.PAFC.WW.Y.0076.000000T0000Z-211229T1000Z/ Matanuska Valley- Including the cities of Palmer, Wasilla, Sutton, and Chickaloon 346 PM AKST Tue Dec 28 2021 ...WINTER WEATHER ADVISORY NOW IN EFFECT UNTIL 1 AM AKST WEDNESDAY... * WHAT...Freezing rain and snow expected. Total ice accumulations of up to one quarter of an inch. Total snow accumulations of up to 4 inches, mainly north and east of Palmer. * WHERE...Matanuska Valley. * WHEN...Until 1 AM AKST Wednesday. * IMPACTS...Travel could be extremely hazardous, including during the evening commute. Be prepared for slippery roads. Ice accumulation may cause downed power lines and falling tree branches. * ADDITIONAL DETAILS...Areas of light freezing rain will develop this afternoon, then become heavier during the evening hours. Precipitation will change to snow during the late evening hours, then quickly end from west to east. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. For the latest road conditions call 5 1 1 or visit 511.alaska.gov. && $$ AKZ121-290600- /O.CON.PAFC.WW.Y.0076.000000T0000Z-211229T0600Z/ Western Kenai Peninsula- Including the cities of Kenai, Soldotna, Homer, and Cooper Landing 346 PM AKST Tue Dec 28 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 9 PM AKST THIS EVENING... * WHAT...Freezing rain occurring. Ice accumulations of up to one tenth of an inch. * WHERE...Western Kenai Peninsula from Kenai east, including Soldotna and Sterling. * WHEN...Until 9 PM AKST this evening. * IMPACTS...Travel could be extremely hazardous, including during the evening commute. Be prepared for slippery roads. * ADDITIONAL DETAILS...Areas of light freezing rain are developing this afternoon at lower elevations, then are expected to become heavier during the late afternoon. The precipitation will quickly end from west to east this evening. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. Prepare for possible power outages. For the latest road conditions call 5 1 1 or visit 511.alaska.gov. && $$ AKZ141-291300- /O.CON.PAFC.WW.Y.0076.211229T0300Z-211229T1300Z/ Copper River Basin- Including the cities of Glennallen, Eureka, McCarthy, Paxson, and Slana 346 PM AKST Tue Dec 28 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 4 AM AKST WEDNESDAY NORTH OF GAKONA... * WHAT...Snow expected. Total snow accumulations of 4 to 8 inches. * WHERE...North of Gakona, including Paxson, Chistochina and Slana. * WHEN...From 6 PM this evening to 4 AM AKST Wednesday. * IMPACTS...Plan on slippery road conditions. * ADDITIONAL DETAILS...The heaviest snow and highest snow accumulation will be close to the Alaska Range. This includes the Richardson Highway near Paxson and the Tok Cutoff from Chistochina to Mentasta Lake. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. For the latest road conditions call 5 1 1 or visit 511.alaska.gov. && $$ AKZ145-290900- /O.CON.PAFC.WW.Y.0076.000000T0000Z-211229T0900Z/ Susitna Valley- Including the cities of Talkeetna, Willow, and Cantwell 346 PM AKST Tue Dec 28 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL MIDNIGHT AKST TONIGHT... * WHAT...Freezing rain and snow expected. Total ice accumulations up to two tenths of an inch. Total snow accumulations of up to 2 inches. * WHERE...From Talkeetna southward in the Susitna Valley. * WHEN...From 3 PM this afternoon to midnight AKST tonight. * IMPACTS...Travel could be extremely hazardous, including during the evening commute. Be prepared for slippery roads. * ADDITIONAL DETAILS...Areas of light freezing rain will develop this afternoon, then become heavier heading into the evening hours. Precipitation will change to snow during the mid to late evening hours, then quickly end by midnight. For the Parks Highway corridor north of Talkeetna, precipitation is expected to fall mainly as snow, with 2 to 4 inches accumulation. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. For the latest road conditions call 5 1 1 or visit 511.alaska.gov. && $$ http://www.weather.gov/afc
972 WWAK41 PAFC 290546 WSWAER URGENT - WINTER WEATHER MESSAGE National Weather Service Anchorage AK 846 PM AKST Tue Dec 28 2021 AKZ101-111-290700- /O.CAN.PAFC.WW.Y.0076.000000T0000Z-211229T1000Z/ Anchorage-Matanuska Valley- Including the cities of Anchorage, Eagle River, Indian, Eklutna, Palmer, Wasilla, Sutton, and Chickaloon 846 PM AKST Tue Dec 28 2021 ...WINTER WEATHER ADVISORY IS CANCELLED... Temperatures across the Anchorage Bowl and Matanuska Valley have warmed to or above freezing, limiting development of freezing rain/drizzle. While pockets of light freezing rain/drizzle are still possible in colder locations, significant ice accretion is no longer expected due to the warmer temperatures. Temperatures will begin to fall overnight, with any lingering liquid precipitation changing to snow before ending. Little to no snow accumulation is expected. Black ice on area roadways is possible for Wednesday as temperatures fall back below freezing. $$ AKZ145-290700- /O.CAN.PAFC.WW.Y.0076.000000T0000Z-211229T0900Z/ Susitna Valley- Including the cities of Talkeetna, Willow, and Cantwell 846 PM AKST Tue Dec 28 2021 ...WINTER WEATHER ADVISORY IS CANCELLED... Temperatures across the southern Susitna Valley have warmed to or above freezing, limiting development of freezing rain/drizzle. Precipitation has transitioned to light snow from Talkeetna north and west. While pockets of light freezing rain/drizzle are still possible in colder locations, significant ice accretion is no longer expected due to the warmer temperatures. Temperatures will begin to fall overnight, with any lingering liquid precipitation changing to snow before ending. Up to 2 inches of snow is possible, mainly from Talkeetna north and west. Black ice on area roadways is possible Wednesday morning as temperatures fall back below freezing. $$ AKZ121-290700- /O.CAN.PAFC.WW.Y.0076.000000T0000Z-211229T0600Z/ Western Kenai Peninsula- Including the cities of Kenai, Soldotna, Homer, and Cooper Landing 846 PM AKST Tue Dec 28 2021 ...WINTER WEATHER ADVISORY IS CANCELLED... Temperatures across the western Kenai Peninsula have warmed to or above freezing, limiting development of freezing rain/drizzle. While pockets of light freezing rain/drizzle are still possible in colder locations, significant ice accretion is no longer expected due to the warmer temperatures. Temperatures will begin to fall overnight, with any lingering liquid precipitation changing to snow before ending. Little to no snow accumulation is expected. Black ice on area roadways is possible for Wednesday as temperatures fall back below freezing. $$ AKZ141-291300- /O.CON.PAFC.WW.Y.0076.000000T0000Z-211229T1300Z/ Copper River Basin- Including the cities of Glennallen, Eureka, McCarthy, Paxson, and Slana 846 PM AKST Tue Dec 28 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 4 AM AKST WEDNESDAY NORTH OF GAKONA... * WHAT...Snow expected. Total snow accumulations of 4 to 8 inches. * WHERE...North of Gakona, including Paxson, Chistochina and Slana. * WHEN...From 6 PM this evening to 4 AM AKST Wednesday. * IMPACTS...Plan on slippery road conditions. * ADDITIONAL DETAILS...The heaviest snow and highest snow accumulation will be close to the Alaska Range. This includes the Richardson Highway near Paxson and the Tok Cutoff from Chistochina to Mentasta Lake. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. For the latest road conditions call 5 1 1 or visit 511.alaska.gov. && $$ http://www.weather.gov/afc
452 WWAK41 PAFC 291303 WSWAER URGENT - WINTER WEATHER MESSAGE National Weather Service Anchorage AK 403 AM AKST Wed Dec 29 2021 AKZ141-291415- /O.EXP.PAFC.WW.Y.0076.000000T0000Z-211229T1300Z/ Copper River Basin- Including the cities of Glennallen, Eureka, McCarthy, Paxson, and Slana 403 AM AKST Wed Dec 29 2021 ...WINTER WEATHER ADVISORY HAS EXPIRED NORTH OF GAKONA... Snow had mainly ended in the Copper River Basin though there may still be another hour or two of snow in the Mentasta Pass region. $$ http://www.weather.gov/afc
What forecasters said that day
The local office's own words before this winter weather advisory 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 winter weather advisory went out at Dec 27, 5:22 PM AKST, 11 hours 7 minutes earlier.
Area forecast discussion, Dec 27, 5:22 PM AKST, 11 hours 7 minutes before
Southcentral and Southwest Alaska Forecast Discussion National Weather Service Anchorage AK 522 PM AKST Mon Dec 27 2021 .ANALYSIS AND UPPER LEVELS... Infrared and water vapor satellite imagery show a strong upper level ridge in the North Pacific and a stacked low in the northern Bering. A warm front extends off the Bering low and stretches across much of Alaska. In the Southwest, rain is slowly tapering off. Bethel and King Salmon have recorded just over 0.15 inches with the warm front, and this plentiful moisture is producing fog over much of the Southwest. In Southcentral, fog that began in the morning has mostly dissipated due to high clouds moving in ahead of the warm front. Across the Aleutians, broad southerly flow and warm advection has kept today's highs in the 40s, with temperatures in Unalaska and Adak reaching the 50s. The advection of warm air aloft with yesterday and today's warm fronts are apparent in the 00Z soundings for Bethel, King Salmon, and Anchorage. In particular, the Anchorage sounding features a stout inversion, with 26 degrees at the surface and 40 degrees at 900 ft. && .MODEL DISCUSSION... Models remain in good synoptic agreement through the short term. Model differences are greatest for precipitation timing and amounts for Tuesday's front. In the Southwest, the GFS keeps the bulk of precipitation further north in the Kuskokwim Delta. In contrast, the NAM and Canadian show higher QPF in Bristol Bay. Tuesday evening, models differ with the timing of embedded shortwaves entering Southcentral. As a result, the NAM and Canadian bring precipitation over Southcentral earlier than the GFS, suggesting higher total QPF and the potential for greater freezing precipitation. && .AVIATION... PANC...Fog is likely (and light freezing drizzle is possible) overnight due to warm air aloft and low-level moisture. Confidence is high that ceilings will increase to at least MVFR Tuesday morning as the temperature inversion lifts. However, confidence with the timing and amount of freezing rain Tuesday afternoon is low. && .SHORT TERM FORECAST SOUTHCENTRAL ALASKA (Days 1 through 2/Tonight through Wednesday)... A shortwave trough is pushing through Southcentral this evening. Radar returns are filling in across the Anchorage Bowl southward into the Turnagain Arm. Areas of light freezing drizzle will be possible into the after-dark hours which will likely result in slick and icy roadways tonight. Not to be outdone, a second area of low pressure is forecast to move into Southcentral late Tuesday with a higher chance of freezing rain across the Matanuska Valley southward into the Kenai Peninsula. Latest numerical guidance has trended slightly warmer with upper level temperatures and this will favor initial precipitation in the form of freezing rain through early Wednesday morning. Accumulations of up to a tenth of an inch will be possible with locally higher amounts not out of the question for the higher elevations, where warmer surface temperatures may slow the transition to all snow. Cold air advection will eventually bring a transition to all snow by early Wednesday morning as low pressure continues eastward and a cold front cools upper level temperatures over Southcentral. What previously looked like a more straight forward forecast has quickly become increasingly complicated with increased uncertainty in duration of freezing rain as well as total ice accumulations. We will be updating the forecast with additional information as the finer details are worked out. && .SHORT TERM FORECAST SOUTHWEST ALASKA (Days 1 through 3: This afternoon through Thursday)... A frontal system moving across the area will continue to produce valley rain and snow in the higher elevations. This front will quickly move away this evening with a brief break tonight, however stratus and fog are likely across most valleys and coastal locations through Tuesday. A stronger front will move across the area beginning Tuesday morning bringing more rain to most valleys. However, interior valleys, especially the lower Kuskokwim River Valley, will see a wintry mix briefly before changing to all rain. Winds will also increase from the south with this system with gusts to 30 to 40 mph at times especially across the Y-K Delta. Tuesday afternoon and evening a cold front will push inland which will bring cooler air to the area. There could be a brief mix of snow, but most of the precipitation will end by the time the cold air arrives. Wednesday will be a slightly cooler day, but still above normal for late December as a ridge of high pressure moves over the area for Tuesday night and Wednesday. A pair of frontal systems will approach, first on Wednesday afternoon and evening bringing a rain snow mix to coastal areas of Bristol Bay and possible farther inland. However, some uncertainty on how far inland the snow will occur. A second stronger front moves inland by Thursday bringing a good chance of snow to inland locations and better chances of rain near the coast. && .SHORT TERM FORECAST BERING SEA/ALEUTIANS (Days 1 through 3: This afternoon through Thursday)... Several fronts and low pressure systems will move across the area through the next couple of days producing areas of Gales and periods of rain. Areas of Gales are expected near a cold front moving across the Bering through Tuesday. Otherwise a couple of compact lows will move across the western Aleutians and Bering through Wednesday producing small areas of Gales near the low. A stronger low and frontal system will enter the central and eastern Aleutians late Wednesday and Thursday producing a wider area of Gales extending into the Bering, especially behind the low and cold front as cold air enhances the winds on Thursday. The AKPen will see periods of rain and Gales most of the period, however on Tuesday night and Wednesday colder air will bring some snow to the area but generally 1 to 3 inches in populated areas. && .MARINE (Days 3 through 5: Thursday through Saturday)... Bering...A North Pacific low tracks towards the Pribilofs Thursday, then enters Southwest Alaska Friday. Winds will be northerly across most of the Bering, peaking at high-end gales on the backside of the low. Southerly small crafts are expected ahead of the low. Starting Friday, a Kamchatka low brings southerly gales as its front tracks into the Western and Central Bering. Seas will be mostly 8-15 ft except 15-25 ft where gales are expected. Gulf of Alaska...Winds below small crafts and seas below 8 ft persist through Thursday evening, when a low develops in the Gulf. Expect widespread small crafts, with a gale-force barrier jet along the northern Gulf Friday morning. As the low moves southeast late Friday, cold outflow winds will develop with storm force winds possible through Kamishak Gap. Seas 8 ft or lower Thursday will increase to 15-25 ft by late Friday. && .LONG TERM FORECAST (Days 4 through 8: Friday through Monday)... An upper-level trough moves across the Southern Mainland Friday through Saturday. Its associated surface low and fronts will bring widespread precipitation across Southwest Friday, transitioning to showers late Friday into Saturday. Precipitation is expected to begin early Friday in Southcentral, tapering off by late Saturday evening. Currently, mixed precipitation or rain look likely over Kodiak and parts of the Southwest as 850 mb temperatures peak just above freezing. In Southcentral, precipitation is likely to remain snow. Once precipitation ends, cold and mostly dry conditions are expected through Monday for the Southern Mainland. A low in the Gulf and a highly amplified ridge in the Bering Sea will allow for northerly cold air advection and gusty gap winds. As a Kamchatka front tracks eastward, it will bring rain across the Aleutians Friday through Monday and push the ridge eastward into the Southwest. .AFC WATCHES/WARNINGS/ADVISORIES... PUBLIC...NONE. MARINE...Gale Warning 120 130-132 138 165 170 172-178 185 351 352 411-414. FIRE WEATHER...NONE. && SYNOPSIS AND MODEL DISCUSSION...KC SOUTHCENTRAL ALASKA...BL SOUTHWEST ALASKA/BERING SEA/ALEUTIANS...RC MARINE/LONG TERM...KC
The office that day
Everything else NWS Anchorage, AK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 27, 3:46 PM AKST | Small Craft Advisory | AFC | 12 hr | |
| Dec 27, 4:10 PM AKST | Small Craft Advisory | AFC | 36 hr | |
| Dec 28, 3:55 AM AKST | Brisk Wind Advisory | AFC | 24 hr | |
| Dec 28, 3:55 AM AKST | Gale Warning | AFC | 35 hr | |
| Dec 28, 3:55 AM AKST | Small Craft Advisory | AFC | 60 hr | |
| Dec 28, 3:57 AM AKST | Gale Warning | AFC | 48 hr | |
| Dec 28, 3:57 AM AKST | Small Craft Advisory | AFC | 24 hr |
Nearby
Winter Weather Advisories in Alaska, 2021Every winter weather advisory 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.