Alert archive / Washington / Wind Chill Advisories in 2021
Wind Chill Advisory 2, NWS Seattle, WA
NWS Seattle, WA issued this wind chill advisory at Dec 28, 2021, 3:13 AM PST for San Juan County, Washington. It took effect at Dec 28, 2021, 7:00 PM PST. It was in force for 18 hr.
The area
The counties it named.
The facts
- Issued
- Dec 28, 2021, 3:13 AM PST (11:13 UTC)
- In effect from
- Dec 28, 2021, 7:00 PM PST
- Expired
- Dec 29, 2021, 1:00 PM PST
- In force
- 18 hr
- Issued by
- NWS Seattle, WA
County San Juan County, WA
The radar
The Seattle radar (KATX), 54 km from the middle of the area, began a volume at 11:12 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
Quillayute State, WA (KUIL), launched 00:00Z, 11.2 hours before the alert went out and 127 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 553 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 223 m²/s²
- 0-3 km storm-relative helicity
- 338 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
988 WWUS46 KSEW 281113 WSWSEW URGENT - WINTER WEATHER MESSAGE National Weather Service Seattle WA 313 AM PST Tue Dec 28 2021 WAZ001-503-290000- /O.NEW.KSEW.WC.Y.0002.211229T0300Z-211229T2100Z/ San Juan County-Western Whatcom County- including Friday Harbor, Eastsound, Bellingham, Blaine, Point Roberts, Ferndale, Lynden, Sumas, and Sudden Valley 313 AM PST Tue Dec 28 2021 ...WIND CHILL ADVISORY IN EFFECT FROM 7 PM THIS EVENING TO 1 PM PST WEDNESDAY... * WHAT...Very cold wind chills expected. Wind chills as low as 10 below zero. * WHERE...San Juan County, including Stuart Island, Waldron Island, Orcas Island, San Juan Island, Lopez Island, Blakely Island, and Decatur Island and Lowlands of western Whatcom County, including Point Roberts, Lummi Island, Bellingham, and Sumas. * WHEN...From 7 PM this evening to 1 PM PST Wednesday. * IMPACTS...Wind chills this cold can cause frostbite on exposed skin in as little as 30 minutes. Hypothermia is also a risk. * ADDITIONAL DETAILS...The coldest wind chills will occur after midnight tonight and Wednesday morning. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use caution while traveling outside. Wear appropriate clothing, a hat, and gloves. && $$ http://www.weather.gov/seattle
3 follow-up statements
038 WWUS46 KSEW 282307 WSWSEW URGENT - WINTER WEATHER MESSAGE National Weather Service Seattle WA 307 PM PST Tue Dec 28 2021 WAZ001-503-291200- /O.CON.KSEW.WC.Y.0002.211229T0300Z-211229T2100Z/ San Juan County-Western Whatcom County- including Friday Harbor, Eastsound, Bellingham, Blaine, Point Roberts, Ferndale, Lynden, Sumas, and Sudden Valley 307 PM PST Tue Dec 28 2021 ...WIND CHILL ADVISORY REMAINS IN EFFECT FROM 7 PM THIS EVENING TO 1 PM PST WEDNESDAY... * WHAT...Very cold wind chills expected. Wind chills as low as 10 below zero. * WHERE...Lowlands of western Whatcom County, including Point Roberts, Lummi Island, Bellingham, and Sumas and San Juan County, including Stuart Island, Waldron Island, Orcas Island, San Juan Island, Lopez Island, Blakely Island, and Decatur Island. * WHEN...From 7 PM this evening to 1 PM PST Wednesday. * IMPACTS...Wind chills this cold can cause frostbite on exposed skin in as little as 30 minutes. Hypothermia is also a risk. * ADDITIONAL DETAILS...The coldest wind chills will occur after midnight tonight and Wednesday morning. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use caution while traveling outside. Wear appropriate clothing, a hat, and gloves. && $$ http://www.weather.gov/seattle
202 WWUS46 KSEW 291121 WSWSEW URGENT - WINTER WEATHER MESSAGE National Weather Service Seattle WA 321 AM PST Wed Dec 29 2021 WAZ567-300000- /O.NEW.KSEW.WW.Y.0041.211230T0600Z-211230T2000Z/ Cascades of Whatcom and Skagit Counties- including Concrete, Hamilton, Lyman, Maple Falls, Deming, and Newhalem 321 AM PST Wed Dec 29 2021 ...WINTER WEATHER ADVISORY IN EFFECT FROM 10 PM THIS EVENING TO NOON PST THURSDAY... * WHAT...Snow expected. Total snow accumulations of 3 to 9 inches. * WHERE...Cascade mountains and valleys of Whatcom and Skagit Counties, including Maple Falls, the Mount Baker Ski Area, Newhalem, Lyman, and Concrete. * WHEN...From 10 PM this evening to noon PST Thursday. * IMPACTS...Plan on slippery road conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. For the latest road conditions in Washington state, call 5 1 1. && $$ WAZ568-569-300000- /O.NEW.KSEW.WW.Y.0041.211230T0900Z-211231T0300Z/ Cascades of Snohomish and King Counties- Cascades of Pierce and Lewis Counties- including Darrington, Baring, Stevens Pass, Skykomish, Snoqualmie Pass, Morton, Ashford, Packwood, Randle, Paradise, and Longmire 321 AM PST Wed Dec 29 2021 ...WINTER WEATHER ADVISORY IN EFFECT FROM 1 AM TO 7 PM PST THURSDAY... * WHAT...Snow expected. Total snow accumulations of 6 to 12 inches. * WHERE...Cascade mountains and valleys of Snohomish and King Counties, including Darrington, Index, Skykomish, Stevens Pass, and Snoqualmie Pass and Cascade mountains and valleys of Pierce and Lewis Counties, including the Crystal Mountain Ski Area, Paradise on Mount Rainier, Ashford, Randle, and Packwood. * WHEN...From 1 AM to 7 PM PST Thursday. * IMPACTS...Plan on slippery road conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. For the latest road conditions in Washington state, call 5 1 1. && $$ WAZ001-503-292100- /O.CON.KSEW.WC.Y.0002.000000T0000Z-211229T2100Z/ San Juan County-Western Whatcom County- including Friday Harbor, Eastsound, Bellingham, Blaine, Point Roberts, Ferndale, Lynden, Sumas, and Sudden Valley 321 AM PST Wed Dec 29 2021 ...WIND CHILL ADVISORY REMAINS IN EFFECT UNTIL 1 PM PST THIS AFTERNOON... * WHAT...Very cold wind chills continued. Wind chills as low as 10 below zero. * WHERE...Lowlands of western Whatcom County, including Point Roberts, Lummi Island, Bellingham, and Sumas and San Juan County, including Stuart Island, Waldron Island, Orcas Island, San Juan Island, Lopez Island, Blakely Island, and Decatur Island. * WHEN...Until 1 PM PST this afternoon. * IMPACTS...Wind chills this cold can cause frostbite on exposed skin in as little as 30 minutes. Hypothermia is also a risk. * ADDITIONAL DETAILS...The coldest wind chill values will occur this morning. PRECAUTIONARY/PREPAREDNESS ACTIONS... Use caution while traveling outside. Wear appropriate clothing, a hat, and gloves. && $$ http://www.weather.gov/seattle
127 WWUS46 KSEW 292055 WSWSEW URGENT - WINTER WEATHER MESSAGE National Weather Service Seattle WA 1255 PM PST Wed Dec 29 2021 WAZ001-503-292200- /O.EXP.KSEW.WC.Y.0002.000000T0000Z-211229T2100Z/ San Juan County-Western Whatcom County- including Friday Harbor, Eastsound, Bellingham, Blaine, Point Roberts, Ferndale, Lynden, Sumas, and Sudden Valley 1255 PM PST Wed Dec 29 2021 ...WIND CHILL ADVISORY WILL EXPIRE AT 1 PM PST THIS AFTERNOON... Recent observations indicate that winds have eased over the area and temperatures have risen to near 20 degrees. Winds will still remain breezy in spots through the afternoon, with wind chills in the single digits to low teens. $$ WAZ567-300000- /O.CON.KSEW.WW.Y.0041.211230T0600Z-211230T2000Z/ Cascades of Whatcom and Skagit Counties- including Concrete, Hamilton, Lyman, Maple Falls, Deming, and Newhalem 1255 PM PST Wed Dec 29 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 10 PM THIS EVENING TO NOON PST THURSDAY... * WHAT...Snow expected. Total snow accumulations of 2 to 9 inches. * WHERE...Cascade mountains and valleys of Whatcom and Skagit Counties, including Maple Falls, the Mount Baker Ski Area, Newhalem, Lyman, and Concrete. * WHEN...From 10 PM this evening to noon PST Thursday. * IMPACTS...Plan on slippery road conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. For the latest road conditions in Washington state, call 5 1 1. && $$ WAZ568-569-300000- /O.CON.KSEW.WW.Y.0041.211230T0900Z-211231T0300Z/ Cascades of Snohomish and King Counties- Cascades of Pierce and Lewis Counties- including Darrington, Baring, Stevens Pass, Skykomish, Snoqualmie Pass, Morton, Ashford, Packwood, Randle, Paradise, and Longmire 1255 PM PST Wed Dec 29 2021 ...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 1 AM TO 7 PM PST THURSDAY... * WHAT...Snow expected. Total snow accumulations of 4 to 12 inches. * WHERE...Cascade mountains and valleys of Pierce and Lewis Counties, including the Crystal Mountain Ski Area, Paradise on Mount Rainier, Ashford, Randle, and Packwood and Cascade mountains and valleys of Snohomish and King Counties, including Darrington, Index, Skykomish, Stevens Pass, and Snoqualmie Pass. * WHEN...From 1 AM to 7 PM PST Thursday. * IMPACTS...Plan on slippery road conditions. PRECAUTIONARY/PREPAREDNESS ACTIONS... Slow down and use caution while traveling. For the latest road conditions in Washington state, call 5 1 1. && $$ http://www.weather.gov/seattle
The office that day
Everything else NWS Seattle, WA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 27, 11:22 PM PST | Small Craft Advisory | SEW | 8 hr | |
| Dec 28, 2:35 AM PST | Gale Watch | SEW | 12 hr | |
| Dec 28, 2:35 AM PST | Small Craft Advisory | SEW | 34 hr | |
| Dec 28, 3:13 AM PST | Wind Advisory | SEW | San Juan | 34 hr |
| Dec 28, 2:22 PM PST | Gale Warning | SEW | 23 hr | |
| Dec 28, 2:22 PM PST | Heavy Freezing Spray Advisory | SEW | 22 hr |
Nearby
Wind Chill Advisories in Washington, 2021Every wind chill 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.