Alert archive / Washington / Wind Advisories in 2008
Wind Advisory 21, NWS Seattle, WA
NWS Seattle, WA issued this wind advisory at Dec 18, 2008, 12:23 AM PST for San Juan County, Washington. It was in force for 28 hr.
The area
The counties it named.
The facts
- Issued
- Dec 18, 2008, 12:23 AM PST (08:23 UTC)
- Expired
- Dec 19, 2008, 4:00 AM PST
- In force
- 28 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 08:26 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, 8.4 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
- 1301 m above ground
- 0-6 km bulk shear
- 84 kt
- 0-1 km storm-relative helicity
- 165 m²/s²
- 0-3 km storm-relative helicity
- 160 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WWUS76 KSEW 180823 NPWSEW URGENT - WEATHER MESSAGE NATIONAL WEATHER SERVICE SEATTLE WA 1223 AM PST THU DEC 18 2008 WAZ001-503-181900- /O.UPG.KSEW.HW.A.0004.081218T1200Z-081219T1200Z/ /O.NEW.KSEW.WI.Y.0021.081218T0823Z-081219T1200Z/ SAN JUAN COUNTY-WESTERN WHATCOM COUNTY- 1223 AM PST THU DEC 18 2008 ...WIND ADVISORY IN EFFECT UNTIL 4 AM PST FRIDAY... THE NATIONAL WEATHER SERVICE IN SEATTLE HAS ISSUED A WIND ADVISORY FOR WESTERN WHATCOM COUNTY AND THE SAN JUAN ISLANDS...WHICH IS IN EFFECT UNTIL 4 AM PST FRIDAY. THE HIGH WIND WATCH IS NO LONGER IN EFFECT. AREAS OF NORTHEAST WINDS OF 25 TO 35 MPH WITH GUSTS TO AROUND 50 MPH WILL AFFECT WESTERN WHATCOM COUNTY AND THE SAN JUAN ISLANDS THROUGH THURSDAY NIGHT. ANOTHER STRONG SURFACE HIGH HAS FORMED OVER BRITISH COLUMBIA. THE RESULTING LARGE PRESSURE DIFFERENCES OR GRADIENT BETWEEN CENTRAL BRITISH COLUMBIA AND NORTHWEST WASHINGTON IS CAUSING ANOTHER ROUND OF NORTHEAST OUTFLOW WINDS ACROSS THE FRASER RIVER VALLEY. LATEST COMPUTER MODELS INDICATE THAT THE NORTHEAST GRADIENT WILL NOT BE QUITE AS STRONG AS A FEW DAYS AGO...HENCE THE HIGH WIND WATCH HAS BEEN DISCONTINUED AND A WIND ADVISORY HAS BEEN ISSUED. IN ADDITION...THE COMBINATION OF THE STRONG WINDS AND THE COLD DRY AIR CAN PRODUCE VERY LOW WIND CHILL VALUES...POSSIBLY BELOW ZERO FAHRENHEIT AT TIMES. FREEZING SPRAY MAY ALSO DEVELOP ALONG SHORELINES AND AFFECT BOATERS. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WIND ADVISORY IS ISSUED WHEN SUSTAINED WINDS OF 30 TO 39 MPH OR GUSTS OF 45 TO 57 MPH ARE LIKELY. WINDS THIS STRONG CAN SNAP SMALL TREE BRANCHES...TOPPLE SMALL OR SHALLOW-ROOTED TREES...AND CAUSE LOCAL POWER OUTAGES. && $$ KAM
4 follow-up statements
000 WWUS76 KSEW 181907 NPWSEW URGENT - WEATHER MESSAGE NATIONAL WEATHER SERVICE SEATTLE WA 1107 AM PST THU DEC 18 2008 WAZ001-503-190315- /O.CON.KSEW.WI.Y.0021.000000T0000Z-081219T1200Z/ SAN JUAN COUNTY-WESTERN WHATCOM COUNTY- 1107 AM PST THU DEC 18 2008 ...WIND ADVISORY REMAINS IN EFFECT UNTIL 4 AM PST FRIDAY... A WIND ADVISORY REMAINS IN EFFECT UNTIL 4 AM PST FRIDAY. AREAS OF NORTHEAST WINDS OF 25 TO 35 MPH WITH GUSTS TO AROUND 50 MPH WILL AFFECT WESTERN WHATCOM COUNTY AND THE SAN JUAN ISLANDS THROUGH TONIGHT. ANOTHER STRONG SURFACE HIGH HAS FORMED OVER BRITISH COLUMBIA. THE RESULTING LARGE PRESSURE DIFFERENCES OR GRADIENT BETWEEN CENTRAL BRITISH COLUMBIA AND NORTHWEST WASHINGTON IS CAUSING ANOTHER ROUND OF NORTHEAST OUTFLOW WINDS ACROSS THE FRASER RIVER VALLEY. IN ADDITION...THE COMBINATION OF THE STRONG WINDS AND THE COLD DRY AIR CAN PRODUCE VERY LOW WIND CHILL VALUES...POSSIBLY BELOW ZERO FAHRENHEIT AT TIMES. FREEZING SPRAY MAY ALSO DEVELOP ALONG SHORELINES AND AFFECT BOATERS. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WIND ADVISORY IS ISSUED WHEN SUSTAINED WINDS OF 30 TO 39 MPH OR GUSTS OF 45 TO 57 MPH ARE LIKELY. WINDS THIS STRONG CAN SNAP SMALL TREE BRANCHES...TOPPLE SMALL OR SHALLOW-ROOTED TREES...AND CAUSE LOCAL POWER OUTAGES. && $$ HANER WEATHER.GOV/SEATTLE
000 WWUS76 KSEW 190020 NPWSEW URGENT - WEATHER MESSAGE NATIONAL WEATHER SERVICE SEATTLE WA 420 PM PST THU DEC 18 2008 WAZ001-503-191200- /O.CON.KSEW.WI.Y.0021.000000T0000Z-081219T1200Z/ SAN JUAN COUNTY-WESTERN WHATCOM COUNTY- 420 PM PST THU DEC 18 2008 ...WIND ADVISORY REMAINS IN EFFECT UNTIL 4 AM PST FRIDAY... A WIND ADVISORY REMAINS IN EFFECT UNTIL 4 AM PST FRIDAY. AREAS OF NORTHEAST WINDS OF 25 TO 35 MPH WITH GUSTS TO AROUND 45 MPH WILL AFFECT WESTERN WHATCOM COUNTY AND THE SAN JUAN ISLANDS THROUGH TONIGHT. IN ADDITION...THE COMBINATION OF THE STRONG WINDS AND THE COLD DRY AIR CAN PRODUCE VERY LOW WIND CHILL VALUES...POSSIBLY BELOW ZERO FAHRENHEIT AT TIMES. FREEZING SPRAY MAY ALSO DEVELOP ALONG SHORELINES AND AFFECT BOATERS. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WIND ADVISORY IS ISSUED WHEN SUSTAINED WINDS OF 30 TO 39 MPH OR GUSTS OF 45 TO 57 MPH ARE LIKELY. WINDS THIS STRONG CAN SNAP SMALL TREE BRANCHES...TOPPLE SMALL OR SHALLOW-ROOTED TREES...AND CAUSE LOCAL POWER OUTAGES. && $$ WAZ505-518-519-191315- /O.NEW.KSEW.HW.A.0005.081220T1500Z-081222T0000Z/ EAST PUGET SOUND LOWLANDS- WEST SLOPES NORTHERN CASCADES AND PASSES- WEST SLOPES CENTRAL CASCADES AND PASSES- 420 PM PST THU DEC 18 2008 ...HIGH WIND WATCH IN EFFECT FROM SATURDAY MORNING THROUGH SUNDAY AFTERNOON... THE NATIONAL WEATHER SERVICE IN SEATTLE HAS ISSUED A HIGH WIND WATCH...WHICH IS IN EFFECT FROM SATURDAY MORNING THROUGH SUNDAY AFTERNOON. A MAJOR AND POTENTIALLY DESTRUCTIVE EAST WIND EVENT SHOULD DEVELOP FROM THE CASCADES INTO THE FOOTHILLS AND THE EAST PUGET SOUND LOWLANDS ON SATURDAY AFTERNOON. THIS EVENT SHOULD THEN CONTIUE THROUGH THE DAY ON SUNDAY. DURING THIS EVENT...SUSTAINED WINDS COULD REACH 50 TO 70 MPH WITH PEAK GUSTS OF 70 TO 90 MPH. IN THE LOWLANDS...THE STRONGEST WINDS ARE EXPECTED TO IMPACT COMMUNITIES IN EASTERN KING COUNTY SUCH HAS NORTH BEND...MAPLE VALLEY AND ENUMCLAW. HOWEVER...STRONG WINDS WILL EXTEND ALL THE WAY WEST TO NEAR LAKE WASHINGTON AND THE HIGHWAY 167 CORRIDOR. PRECAUTIONARY/PREPAREDNESS ACTIONS... NOW IS THE TIME TO PREPARE FOR THIS POTENTIALLY DESTRUCTIVE WIND EVENT. TAKE THE TIME ON FRIDAY TO PREPARE FOR THE EVENTUALITY OF FALLING TREES...WHICH COULD BLOCK HIGHWAYS...AND PROLONGED POWER OUTAGES. BE SURE TO HAVE A FULL TANK OF GAS IN YOUR CAR AND ENOUGH FOOD ON HAND TO FEED YOUR HOUSEHOLD FOR SEVERAL DAYS. CONSIDER SAFE WAYS TO KEEP YOUR FAMILY WARM IF THE POWER GOES OUT WHILE OUTDOOR TEMPERATURES REMAIN BELOW FREEZING. WIND CHILL VALUES DURING THIS EVENT WILL BE NEAR ZERO IN THE LOWLANDS AND ABOUT 25 BELOW ZERO NEAR THE MAJOR MOUNTAIN PASSES. && $$ HANER WEATHER.GOV/SEATTLE
000 WWUS76 KSEW 190641 NPWSEW URGENT - WEATHER MESSAGE NATIONAL WEATHER SERVICE SEATTLE WA 1041 PM PST THU DEC 18 2008 WAZ001-503-191445- /O.EXT.KSEW.WI.Y.0021.000000T0000Z-081220T0200Z/ SAN JUAN COUNTY-WESTERN WHATCOM COUNTY- 1041 PM PST THU DEC 18 2008 ...WIND ADVISORY IN EFFECT FOR SAN JUAN AND WESTERN WHATCOM COUNTIES UNTIL 6 PM PST FRIDAY... THE WIND ADVISORY IS NOW IN EFFECT UNTIL 6 PM PST FRIDAY. NORTHERLY WINDS WILL INCREASE LATER TONIGHT OR FRIDAY MORNING ACROSS THOSE AREAS EXPOSED TO WINDS COMING OUT OF THE FRASER RIVER VALLEY. THESE AREAS CAN EXPECT WINDS OF 2O TO 3O MPH WITH GUSTS NEAR 45 MPH ON FRIDAY. THE STRONG WINDS WILL RESULT IN WIND CHILL READINGS IN THE ZERO TO TEN DEGREE RANGE. PRECAUTIONARY/PREPAREDNESS ACTIONS... A WIND ADVISORY IS ISSUED WHEN SUSTAINED WINDS OF 30 TO 39 MPH OR GUSTS OF 45 TO 57 MPH ARE LIKELY. WINDS THIS STRONG CAN SNAP SMALL TREE BRANCHES...TOPPLE SMALL OR SHALLOW-ROOTED TREES...AND CAUSE LOCAL POWER OUTAGES. && $$ WAZ505-518-519-191445- /O.CON.KSEW.HW.A.0005.081220T1500Z-081222T0000Z/ EAST PUGET SOUND LOWLANDS- WEST SLOPES NORTHERN CASCADES AND PASSES- WEST SLOPES CENTRAL CASCADES AND PASSES- 1041 PM PST THU DEC 18 2008 ...HIGH WIND WATCH REMAINS IN EFFECT FOR THE EAST PUGET SOUND LOWLANDS AND THE NORTH AND CENTRAL CASCADES FROM SATURDAY MORNING THROUGH SUNDAY AFTERNOON... A HIGH WIND WATCH REMAINS IN EFFECT FROM SATURDAY MORNING THROUGH SUNDAY AFTERNOON. A POTENTIALLY DESTRUCTIVE EAST WIND EVENT MAY DEVELOP FROM THE CASCADES INTO THE EAST PUGET SOUND LOWLANDS SATURDAY AFTERNOON. THIS EVENT SHOULD THEN CONTINUE THROUGH THE DAY ON SUNDAY. DURING THIS EVENT...SUSTAINED WINDS COULD REACH 50 TO 70 MPH WITH PEAK GUSTS OF 70 TO 90 MPH. IN THE LOWLANDS...THE STRONGEST WINDS ARE EXPECTED TO IMPACT COMMUNITIES IN EASTERN KING COUNTY SUCH HAS NORTH BEND...MAPLE VALLEY AND ENUMCLAW. HOWEVER...STRONG WINDS WILL EXTEND ALL THE WAY WEST TO NEAR LAKE WASHINGTON AND THE HIGHWAY 167 CORRIDOR. PRECAUTIONARY/PREPAREDNESS ACTIONS... A HIGH WIND WATCH MEANS CONDITIONS ARE FAVORABLE FOR A DAMAGING WIND EVENT. SUSTAINED WINDS OF AT LEAST 50 MPH...OR GUSTS OF 70 MPH OR HIGHER MAY OCCUR. RESIDENTS AND LOCAL OFFICIALS IN THE WATCH AREA SHOULD BE PREPARED FOR THE POSSIBILITY OF WIDESPREAD DAMAGE AND POWER OUTAGES THAT COULD LAST FOR MORE THAN A WEEK. CONSIDER SAFE WAYS TO KEEP YOUR FAMILY WARM IF THE POWER GOES OUT WHILE OUTDOOR TEMPERATURES REMAIN BELOW FREEZING. WIND CHILL READINGS DURING THIS EVENT MAY BE NEAR ZERO IN THE LOWLANDS AND ABOUT 25 BELOW ZERO IN THE MAJOR MOUNTAIN PASSES. && $$ WEATHER.GOV
000 WWUS76 KSEW 191200 NPWSEW URGENT - WEATHER MESSAGE NATIONAL WEATHER SERVICE SEATTLE WA 400 AM PST FRI DEC 19 2008 WAZ001-503-191300- /O.CAN.KSEW.WI.Y.0021.000000T0000Z-081220T0200Z/ SAN JUAN COUNTY-WESTERN WHATCOM COUNTY- 400 AM PST FRI DEC 19 2008 ...WIND ADVISORY IS CANCELLED... THE NATIONAL WEATHER SERVICE IN SEATTLE HAS CANCELLED THE WIND ADVISORY FOR WESTERN WHATCOM COUNTY AND SAN JUAN COUNTY. ADVISORY LEVEL WINDS ARE NO LONGER EXPECTED TO DEVELOP. && $$ WAZ515-192000- /O.EXA.KSEW.HW.A.0005.081220T1500Z-081222T0000Z/ WESTERN STRAIT OF JUAN DE FUCA- 400 AM PST FRI DEC 19 2008 ...HIGH WIND WATCH IN EFFECT FROM SATURDAY MORNING THROUGH SUNDAY AFTERNOON... THE NATIONAL WEATHER SERVICE IN SEATTLE HAS ISSUED A HIGH WIND WATCH FOR THE WESTERN STRAIT OF JUAN DE FUCA...WHICH IS IN EFFECT FROM SATURDAY MORNING THROUGH SUNDAY AFTERNOON. STRONG EAST WINDS WILL DEVELOP SATURDAY AND CONTINUE INTO SUNDAY MORNING AS A FRONTAL SYSTEM APPROACHES THE AREA. THE STRONGEST WINDS WILL LIKELY OCCUR SATURDAY AFTERNOON AND NIGHT. SUSTAINED WINDS 30 TO 40 MPH WITH GUSTS TO 60 MPH ARE POSSIBLE. PRECAUTIONARY/PREPAREDNESS ACTIONS... A HIGH WIND WATCH MEANS CONDITIONS ARE FAVORABLE FOR A DAMAGING WIND EVENT. SUSTAINED WINDS OF AT LEAST 40 MPH...OR GUSTS OF 60 MPH OR HIGHER MAY OCCUR. RESIDENTS AND LOCAL OFFICIALS IN THE WATCH AREA SHOULD BE PREPARED FOR THE POSSIBILITY OF WIND DAMAGE AND POWER OUTAGES. && $$ WAZ505-518-519-192000- /O.CON.KSEW.HW.A.0005.081220T1500Z-081222T0000Z/ EAST PUGET SOUND LOWLANDS- WEST SLOPES NORTHERN CASCADES AND PASSES- WEST SLOPES CENTRAL CASCADES AND PASSES- 400 AM PST FRI DEC 19 2008 ...HIGH WIND WATCH REMAINS IN EFFECT FROM SATURDAY MORNING THROUGH SUNDAY AFTERNOON... A HIGH WIND WATCH REMAINS IN EFFECT FOR THE EAST PUGET SOUND LOWLANDS AND FOR THE WEST SLOPES OF THE NORTH AND CENTRAL WASHINGTON CASCADES...FROM SATURDAY MORNING THROUGH SUNDAY AFTERNOON. DURING THIS EVENT...SUSTAINED WINDS COULD REACH 50 TO 70 MPH WITH PEAK GUSTS OF 70 TO 90 MPH. IN THE LOWLANDS...THE STRONGEST WINDS ARE EXPECTED TO IMPACT COMMUNITIES IN EASTERN KING COUNTY SUCH AS NORTH BEND...MAPLE VALLEY AND ENUMCLAW. HOWEVER...STRONG WINDS COULD EXTEND ALL THE WAY WEST TO NEAR LAKE WASHINGTON AND THE HIGHWAY 167 CORRIDOR. PRECAUTIONARY/PREPAREDNESS ACTIONS... A HIGH WIND WATCH MEANS CONDITIONS ARE FAVORABLE FOR A DAMAGING WIND EVENT. SUSTAINED WINDS OF AT LEAST 40 MPH...OR GUSTS TO 60 MPH OR HIGHER MAY OCCUR. RESIDENTS AND LOCAL OFFICIALS IN THE WATCH AREA SHOULD BE PREPARED FOR THE POSSIBILITY OF WIDESPREAD DAMAGE AND POWER OUTAGES THAT COULD LAST FOR MORE THAN A WEEK. CONSIDER SAFE WAYS TO KEEP YOUR FAMILY WARM IF THE POWER GOES OUT WHILE OUTDOOR TEMPERATURES REMAIN BELOW FREEZING. WIND CHILL READINGS DURING THIS EVENT MAY BE NEAR ZERO IN THE LOWLANDS AND ABOUT 25 BELOW ZERO IN THE MAJOR MOUNTAIN PASSES. && $$
The office that day
Everything else NWS Seattle, WA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 18, 12:09 AM PST | Gale Warning | SEW | 28 hr | |
| Dec 18, 9:05 AM PST | Small Craft Advisory for Rough Bar | SEW | 5 days | |
| Dec 18, 9:05 AM PST | Small Craft Advisory | SEW | 42 hr | |
| Dec 18, 10:08 AM PST | Winter Weather Advisory | SEW | 12 hr |
Nearby
Wind Advisories in Washington, 2008Every wind advisory in 2008
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.