Alert archive / Oregon / Hazardous Seas Warnings in 2021

Hazardous Seas Warning 78, NWS Medford, OR

December 1, 2021

NWS Medford, OR issued this hazardous seas warning at Dec 1, 2021, 1:47 AM PST. It took effect at Dec 2, 2021, 1:00 PM PST. It was in force for 21 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 1, 2021, 1:47 AM PST (09:47 UTC)
In effect from
Dec 2, 2021, 1:00 PM PST
Expired
Dec 3, 2021, 10:00 AM PST
In force
21 hr
Issued by
NWS Medford, OR

The text

As transmitted.

217 
WHUS76 KMFR 010947
MWWMFR

URGENT - MARINE WEATHER MESSAGE
National Weather Service Medford OR
147 AM PST Wed Dec 1 2021

PZZ370-376-012300-
/O.CON.KMFR.SC.Y.0123.211201T1800Z-211203T2000Z/
/O.UPG.KMFR.SE.A.0031.211203T0000Z-211203T2000Z/
/O.NEW.KMFR.SE.W.0078.211203T0000Z-211203T2000Z/
Waters from Florence to Cape Blanco OR from 10 to 60 nm-
Waters from Cape Blanco OR to Pt. St. George CA from 10 to 60 nm-
147 AM PST Wed Dec 1 2021

...SMALL CRAFT ADVISORY REMAINS IN EFFECT FROM 10 AM THIS MORNING
TO NOON PST FRIDAY...
...HAZARDOUS SEAS WARNING IN EFFECT FROM 4 PM THURSDAY TO NOON
PST FRIDAY...

* WHAT...Very steep and hazardous seas 8 to 11 ft at 10 seconds
  with north winds 15 to 25 kt and gusts up to 35 kt.

* WHERE...For the Hazardous Seas Warning, beyond 10 nm from shore
  and south of Coos Bay. For the Small Craft Advisory, locations 
  north of Coos Bay and within 10 nm of shore. 

* WHEN...For the Hazardous Seas Warning, from 4 PM Thursday to 
  noon PST Friday. For the Small Craft Advisory, from 10 AM this 
  morning to noon PST Friday.

* IMPACTS...Very steep and hazardous seas could capsize or 
  damage vessels. Bar crossings will become especially 
  treacherous.

* View the hazard area in detail at https://go.usa.gov/x6hks

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Recreational boaters should remain in port. Commercial vessels
should prepare for very steep seas and consider remaining in port
until conditions improve.

&&

$$

PZZ350-356-012300-
/O.CON.KMFR.SC.Y.0123.211201T1800Z-211203T2000Z/
Coastal waters from Florence to Cape Blanco OR out 10 nm-
Coastal waters from Cape Blanco OR to Pt. St. George CA out 10 nm-
147 AM PST Wed Dec 1 2021

...SMALL CRAFT ADVISORY REMAINS IN EFFECT FROM 10 AM THIS MORNING
TO NOON PST FRIDAY...

* WHAT...North winds 15 to 25 kt with gusts up to 30 kt and 
  steep seas 8 to 11 ft at 13 seconds.

* WHERE...All areas between Florence and Pt. St. George.

* WHEN...From 10 AM Wednesday to noon PST Friday.

* IMPACTS...Gusty winds and/or steep seas could capsize or 
  damage smaller vessels.

* View the hazard area in detail at https://go.usa.gov/x6hks

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Inexperienced mariners and those operating smaller vessels should
remain in port and avoid the area of hazardous conditions.

&&

$$

Visit us at https://www.weather.gov/Medford
8 follow-up statements
654 
WHUS76 KMFR 012208
MWWMFR

URGENT - MARINE WEATHER MESSAGE
National Weather Service Medford OR
208 PM PST Wed Dec 1 2021

PZZ370-376-021115-
/O.CON.KMFR.SC.Y.0123.000000T0000Z-211203T2000Z/
/O.CON.KMFR.SE.W.0078.211203T0000Z-211203T2000Z/
Waters from Florence to Cape Blanco OR from 10 to 60 nm-
Waters from Cape Blanco OR to Pt. St. George CA from 10 to 60 nm-
208 PM PST Wed Dec 1 2021

...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL NOON PST FRIDAY...
...HAZARDOUS SEAS WARNING REMAINS IN EFFECT FROM 4 PM THURSDAY TO
NOON PST FRIDAY...

* WHAT...For the Hazardous Seas Warning, very steep and hazardous
  seas 8 to 12 ft at 13 seconds. For the Small Craft Advisory, 
  north winds 15 to 25 kt with gusts up to 35 kt and seas 8 to 13 
  ft at 13 seconds.

* WHERE...For the Hazardous Seas Warning, beyond 10 nm from 
  shore and south of Coos Bay. For the Small Craft Advisory, 
  locations north of Coos Bay and within 10 nm of shore.

* WHEN...For the Hazardous Seas Warning, from 4 PM Thursday to 
  noon PST Friday. For the Small Craft Advisory, from 10 AM this 
  morning to noon PST Friday.

* IMPACTS...Very steep and hazardous seas could capsize or 
  damage vessels. Bar crossings will become especially 
  treacherous.

* View the hazard area in detail at https://go.usa.gov/x6hks

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Recreational boaters should remain in port. Commercial vessels
should prepare for very steep seas and consider remaining in port
until conditions improve.

&&

$$

PZZ350-356-021115-
/O.CON.KMFR.SC.Y.0123.000000T0000Z-211203T2000Z/
Coastal waters from Florence to Cape Blanco OR out 10 nm-
Coastal waters from Cape Blanco OR to Pt. St. George CA out 10 nm-
208 PM PST Wed Dec 1 2021

...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL NOON PST FRIDAY...

* WHAT...North winds 15 to 25 kt with gusts up to 30 kt and seas 
  7 to 11 ft at 13 seconds.

* WHERE...All areas between Florence and Pt. St. George.

* WHEN...From 10 AM Wednesday to noon PST Friday.

* IMPACTS...Gusty winds and/or steep seas could capsize or 
  damage smaller vessels.

* View the hazard area in detail at https://go.usa.gov/x6hks

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Inexperienced mariners and those operating smaller vessels should
remain in port and avoid the area of hazardous conditions.

&&

$$

Visit us at https://www.weather.gov/Medford
012 
WHUS76 KMFR 021110
MWWMFR

URGENT - MARINE WEATHER MESSAGE
National Weather Service Medford OR
310 AM PST Thu Dec 2 2021

PZZ370-376-030015-
/O.CON.KMFR.SC.Y.0123.000000T0000Z-211203T2000Z/
/O.CON.KMFR.SE.W.0078.211203T0000Z-211203T2000Z/
Waters from Florence to Cape Blanco OR from 10 to 60 nm-
Waters from Cape Blanco OR to Pt. St. George CA from 10 to 60 nm-
310 AM PST Thu Dec 2 2021

...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL NOON PST FRIDAY...
...HAZARDOUS SEAS WARNING REMAINS IN EFFECT FROM 4 PM THIS
AFTERNOON TO NOON PST FRIDAY...

* WHAT...For the Hazardous Seas Warning, very steep and 
  hazardous seas 8 to 12 ft at 13 seconds. For the Small Craft 
  Advisory, north winds 15 to 25 kt with gusts up to 35 kt and 
  seas 8 to 13 ft at 13 seconds.

* WHERE...For the Hazardous Seas Warning, beyond 10 nm from 
  shore and south of Coos Bay. For the Small Craft Advisory, 
  locations north of Coos Bay and within 10 nm of shore.

* WHEN...For the Hazardous Seas Warning, from 4 PM this 
  afternoon to noon PST Friday. For the Small Craft Advisory, 
  until noon PST Friday.

* IMPACTS...Very steep and hazardous seas could capsize or 
  damage vessels. Bar crossings will become especially 
  treacherous.

* View the hazard area in detail at https://go.usa.gov/x6hks

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Recreational boaters should remain in port. Commercial vessels
should prepare for very steep seas and consider remaining in port
until conditions improve.

&&

$$

PZZ350-356-030015-
/O.CON.KMFR.SC.Y.0123.000000T0000Z-211203T2000Z/
Coastal waters from Florence to Cape Blanco OR out 10 nm-
Coastal waters from Cape Blanco OR to Pt. St. George CA out 10 nm-
310 AM PST Thu Dec 2 2021

...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL NOON PST FRIDAY...

* WHAT...North winds 15 to 25 kt with gusts up to 30 kt and seas 
  7 to 11 ft at 13 seconds.

* WHERE...All areas between Florence and Pt. St. George.

* WHEN...Until noon PST Friday.

* IMPACTS...Gusty winds and/or steep seas could capsize or 
  damage smaller vessels.

* View the hazard area in detail at https://go.usa.gov/x6hks

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Inexperienced mariners and those operating smaller vessels should
remain in port and avoid the area of hazardous conditions.

&&

$$

Visit us at https://www.weather.gov/Medford
124 
WHUS76 KMFR 021453
MWWMFR

URGENT - MARINE WEATHER MESSAGE
National Weather Service Medford OR
653 AM PST Thu Dec 2 2021

PZZ370-376-030400-
/O.CON.KMFR.SC.Y.0123.000000T0000Z-211203T2000Z/
/O.CON.KMFR.SE.W.0078.211203T0000Z-211203T2000Z/
Waters from Florence to Cape Blanco OR from 10 to 60 nm-
Waters from Cape Blanco OR to Pt. St. George CA from 10 to 60 nm-
653 AM PST Thu Dec 2 2021

...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL NOON PST FRIDAY...
...HAZARDOUS SEAS WARNING REMAINS IN EFFECT FROM 4 PM THIS
AFTERNOON TO NOON PST FRIDAY...

* WHAT...For the Hazardous Seas Warning, very steep and hazardous
  seas 8 to 12 ft at 10 seconds. For the Small Craft Advisory, 
  north winds 15 to 25 kt with gusts up to 35 kt and seas 8 to 13 
  ft at 13 seconds.

* WHERE...For the Hazardous Seas Warning, beyond 10 nm from 
  shore and south of Coos Bay. For the Small Craft Advisory, 
  locations north of Coos Bay and within 10 nm of shore.

* WHEN...For the Hazardous Seas Warning, from 4 PM this 
  afternoon to noon PST Friday. For the Small Craft Advisory, 
  until noon PST Friday.

* IMPACTS...Very steep and hazardous seas could capsize or 
  damage vessels. Bar crossings will become especially 
  treacherous.

* View the hazard area in detail at https://go.usa.gov/x6hks

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Recreational boaters should remain in port. Commercial vessels
should prepare for very steep seas and consider remaining in port
until conditions improve.

&&

$$

PZZ350-356-030400-
/O.CON.KMFR.SC.Y.0123.000000T0000Z-211203T2000Z/
Coastal waters from Florence to Cape Blanco OR out 10 nm-
Coastal waters from Cape Blanco OR to Pt. St. George CA out 10 nm-
653 AM PST Thu Dec 2 2021

...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL NOON PST FRIDAY...

* WHAT...North winds 15 to 25 kt with gusts up to 30 kt and seas 
  7 to 11 ft at 13 seconds.

* WHERE...All areas between Florence and Pt. St. George.

* WHEN...Until noon PST Friday.

* IMPACTS...Gusty winds and/or steep seas could capsize or 
  damage smaller vessels.

* View the hazard area in detail at https://go.usa.gov/x6hks

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Inexperienced mariners and those operating smaller vessels should
remain in port and avoid the area of hazardous conditions.

&&

$$

Visit us at https://www.weather.gov/Medford
864 
WHUS76 KMFR 021732
MWWMFR

URGENT - MARINE WEATHER MESSAGE
National Weather Service Medford OR
932 AM PST Thu Dec 2 2021

PZZ350-356-030645-
/O.CON.KMFR.SC.Y.0123.000000T0000Z-211203T2000Z/
/O.EXB.KMFR.SE.W.0078.211203T0000Z-211203T1200Z/
Coastal waters from Florence to Cape Blanco OR out 10 nm-
Coastal waters from Cape Blanco OR to Pt. St. George CA out 10 nm-
932 AM PST Thu Dec 2 2021

...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL NOON PST FRIDAY...
...HAZARDOUS SEAS WARNING IN EFFECT FROM 4 PM THIS AFTERNOON TO
4 AM PST FRIDAY...

* WHAT...North winds 15 to 25 kt will increase to 20 to 30 kt
  late this afternoon and evening, then gradually lower late 
  tonight into Friday. Steep, west seas of 10 to 11 ft at 13 
  seconds will become steep to very steep seas of 9 to 11 feet due
  to a mix of wind seas and swell late this afternoon through 
  tonight. 

* WHERE...Small craft advisory conditions are expected for all
  areas this morning into this afternoon. Very steep hazardous 
  seas will affect areas beyond 5 nm from shore from 5 nm north of
  Cape Blanco southward late this afternoon through tonight with 
  conditions hazardous to small craft elsewhere.

* WHEN...For the Hazardous Seas Warning, from 4 PM this 
  afternoon to 4 AM PST Friday. For the Small Craft Advisory, 
  until noon PST Friday.

* IMPACTS...Very steep and hazardous seas could capsize or 
  damage vessels. Bar crossings will become especially 
  treacherous.

* View the hazard area in detail at https://go.usa.gov/x6hks

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Recreational boaters should remain in port. Commercial vessels
should prepare for very steep seas and consider remaining in port
until conditions improve.

&&

$$

PZZ376-030645-
/O.EXT.KMFR.SC.Y.0123.000000T0000Z-211203T0000Z/
/O.EXT.KMFR.SE.W.0078.211202T2100Z-211203T2000Z/
/O.NEW.KMFR.SC.Y.0124.211203T1200Z-211203T2000Z/
Waters from Cape Blanco OR to Pt. St. George CA from 10 to 60 nm-
932 AM PST Thu Dec 2 2021

...SMALL CRAFT ADVISORY NOW IN EFFECT UNTIL 4 PM PST THIS
AFTERNOON...
...HAZARDOUS SEAS WARNING NOW IN EFFECT FROM 1 PM THIS AFTERNOON
TO NOON PST FRIDAY...
...SMALL CRAFT ADVISORY IN EFFECT FROM 4 AM TO NOON PST FRIDAY...

* WHAT...North winds 20 to 30 kt increasing to 25 to 30 kt with
  occasional gusts up to 35 kt this afternoon and evening, then
  gradually lowering late tonight into Friday. Steep, west seas of
  10 to 11 ft at 13 seconds will become very steep 10 to 12 feet
  seas dominated by short period wind seas this afternoon through
  tonight.

* WHERE...Small craft advisory conditions are expected this 
  morning. Very steep hazardous seas will affect areas south of 
  Gold Beach this afternoon with steep seas continuing elsewhere. 
  Then very steep hazardous seas will affect all areas late this 
  afternoon through Friday morning.
 
* WHEN...For the Hazardous Seas Warning, from 1 PM this 
  afternoon to noon PST Friday. For the Small Craft Advisory, 
  until 4 PM PST this afternoon. For the Small Craft Advisory, 
  from 4 AM to noon PST Friday.

* IMPACTS...Very steep and hazardous seas could capsize or 
  damage vessels. Bar crossings will become especially 
  treacherous.

* View the hazard area in detail at https://go.usa.gov/x6hks

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Recreational boaters should remain in port. Commercial vessels
should prepare for very steep seas and consider remaining in port
until conditions improve.

&&

$$

PZZ370-030645-
/O.CON.KMFR.SC.Y.0123.000000T0000Z-211203T2000Z/
/O.EXT.KMFR.SE.W.0078.211203T0000Z-211203T1200Z/
Waters from Florence to Cape Blanco OR from 10 to 60 nm-
932 AM PST Thu Dec 2 2021

...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL NOON PST FRIDAY...
...HAZARDOUS SEAS WARNING NOW IN EFFECT FROM 4 PM THIS AFTERNOON
TO 4 AM PST FRIDAY...

* WHAT...For the Hazardous Seas Warning, north winds 25 kt with
  gusts to 30 kt and very steep and hazardous seas 10 to 11 feet
  due to a mix of wind seas and west swell. For the Small Craft
  Advisory, north winds 15 to 25 kt and steep seas of 8 to 10 ft,
  dominated by west swell at 13 seconds combined with wind seas.

* WHERE...For the Hazardous Seas Warning, beyond 10 nm from shore
  and south of Reedsport late this afternoon through tonight. For
  the Small Craft Advisory, all areas this morning and afternoon 
  then locations north of Reedsport and within 10 nm of shore this
  afternoon through tonight.

* WHEN...For the Hazardous Seas Warning, from 4 PM this 
  afternoon to 4 AM PST Friday. For the Small Craft Advisory, 
  until noon PST Friday.

* IMPACTS...Very steep and hazardous seas could capsize or 
  damage vessels. Bar crossings will become especially 
  treacherous.

* View the hazard area in detail at https://go.usa.gov/x6hks

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Recreational boaters should remain in port. Commercial vessels
should prepare for very steep seas and consider remaining in port
until conditions improve.

&&

$$

Visit us at https://www.weather.gov/Medford
854 
WHUS76 KMFR 022212
MWWMFR

URGENT - MARINE WEATHER MESSAGE
National Weather Service Medford OR
212 PM PST Thu Dec 2 2021

PZZ376-031215-
/O.CON.KMFR.SE.W.0078.000000T0000Z-211203T2000Z/
/O.CON.KMFR.SC.Y.0123.000000T0000Z-211203T0000Z/
/O.CON.KMFR.SC.Y.0124.211203T1200Z-211203T2000Z/
Waters from Cape Blanco OR to Pt. St. George CA from 10 to 60 nm-
212 PM PST Thu Dec 2 2021

...HAZARDOUS SEAS WARNING REMAINS IN EFFECT UNTIL NOON PST
FRIDAY...
...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 4 PM PST THIS
AFTERNOON...
...SMALL CRAFT ADVISORY REMAINS IN EFFECT FROM 4 AM TO NOON PST
FRIDAY...

* WHAT...North winds 25 to 30 kt with occasional gusts up to 35 kt
  this, gradually lowering late tonight into Friday. Very steep
  seas 10 to 12 feet through tonight.

* WHERE...Hazardous Seas Warning conditions will affect areas 
  south of Gold Beach this afternoon with steep seas continuing 
  elsewhere. Then very steep hazardous seas will affect all areas 
  late this afternoon through Friday morning.

* WHEN...For the Hazardous Seas Warning, from 1 PM this afternoon
  to noon PST Friday. For the Small Craft Advisory, until 4 PM PST
  this afternoon, then again from 4 AM to noon PST Friday.

* IMPACTS...Very steep and hazardous seas could capsize or 
  damage vessels. Bar crossings will become especially 
  treacherous.

* View the hazard area in detail at https://go.usa.gov/x6hks

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Recreational boaters should remain in port. Commercial vessels
should prepare for very steep seas and consider remaining in port
until conditions improve.

&&

$$

PZZ350-356-370-031215-
/O.CON.KMFR.SC.Y.0123.000000T0000Z-211203T2000Z/
/O.CON.KMFR.SE.W.0078.211203T0000Z-211203T1200Z/
Coastal waters from Florence to Cape Blanco OR out 10 nm-
Coastal waters from Cape Blanco OR to Pt. St. George CA out 10 nm-
Waters from Florence to Cape Blanco OR from 10 to 60 nm-
212 PM PST Thu Dec 2 2021

...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL NOON PST FRIDAY...
...HAZARDOUS SEAS WARNING REMAINS IN EFFECT UNTIL 4 AM PST
FRIDAY...

* WHAT...North winds 20 to 30 kt late this afternoon and evening,
  then gradually lower late tonight into Friday. Very steep seas 
  of 9 to 11 feet due to a mix of wind seas and swell late this 
  afternoon through tonight.

* WHERE...Small craft advisory conditions will affect all areas
  into this afternoon. Except for Hazardous Seas Warning
  conditions beyond 5 nm from shore from 5 nm north of Cape 
  Blanco southward late this afternoon through tonight.

* WHEN...For the Hazardous Seas Warning, from 4 PM this 
  afternoon to 4 AM PST Friday. For the Small Craft Advisory, 
  until noon PST Friday.

* IMPACTS...Very steep and hazardous seas could capsize or 
  damage vessels. Bar crossings will become especially 
  treacherous.

* View the hazard area in detail at https://go.usa.gov/x6hks

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Recreational boaters should remain in port. Commercial vessels
should prepare for very steep seas and consider remaining in port
until conditions improve.

&&

$$

Visit us at https://www.weather.gov/Medford
455 
WHUS76 KMFR 030602
MWWMFR

URGENT - MARINE WEATHER MESSAGE
National Weather Service Medford OR
1002 PM PST Thu Dec 2 2021

PZZ350-356-032300-
/O.EXT.KMFR.SE.W.0078.000000T0000Z-211203T1500Z/
/O.EXT.KMFR.SC.Y.0123.000000T0000Z-211204T0600Z/
Coastal waters from Florence to Cape Blanco OR out 10 nm-
Coastal waters from Cape Blanco OR to Pt. St. George CA out 10 nm-
1002 PM PST Thu Dec 2 2021

...HAZARDOUS SEAS WARNING NOW IN EFFECT UNTIL 7 AM PST FRIDAY...
...SMALL CRAFT ADVISORY NOW IN EFFECT UNTIL 10 PM PST FRIDAY...

* WHAT...For the Hazardous Seas Warning, north winds 15 to 25
  knots with gusts 25 to 30 knots and very steep, hazardous seas
  10 to 11 ft. For the Small Craft Advisory, north winds 10 to 20
  kt with gusts up to 30 kt and steep seas 8 to 10 ft. Seas will
  be due to a mix of short period northerly wind waves and 13
  seconds period swell from the west-northwest.

* WHERE...The Hazardous Seas Warning is for areas beyond about 5NM
  west of the coast westward from Bandon southward. The Small
  Craft Advisory is in effect for the remainder of the area.
  However, the advisory area will diminish late Friday morning
  onward to areas about 5NM west of Cape Blanco and to portions of
  the area north of Cape Blanco west of Bandon and Coos Bay. 

* WHEN...For the Hazardous Seas Warning, until 7 AM PST Friday. 
  For the Small Craft Advisory, until 10 PM PST Friday.

* IMPACTS...Very steep, hazardous seas could capsize or damage
  vessels. Steep seas will be hazardous to some small craft,
  especially inexperienced mariners. 

* View the hazard area in detail at https://go.usa.gov/x6hks


PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Hazardous Seas Warning means very steep and hazardous sea
conditions are imminent or occurring. Recreational boaters should
remain in port, or take shelter until waves subside.  Commercial
vessels should prepare for rough seas and consider remaining in
port or taking shelter in port until hazardous seas subside.

A Small Craft Advisory means that winds and seas will create a
potential hazard to smaller vessels and inexperienced mariners.

&&

$$

PZZ370-032300-
/O.EXT.KMFR.SE.W.0078.000000T0000Z-211203T1800Z/
/O.EXT.KMFR.SC.Y.0123.000000T0000Z-211204T0600Z/
Waters from Florence to Cape Blanco OR from 10 to 60 nm-
1002 PM PST Thu Dec 2 2021

...HAZARDOUS SEAS WARNING NOW IN EFFECT UNTIL 10 AM PST FRIDAY...
...SMALL CRAFT ADVISORY NOW IN EFFECT UNTIL 10 PM PST FRIDAY...

* WHAT...For the Hazardous Seas Warning, north winds 20 to 25
  knots with gusts 25 to 30 knots and very steep, hazardous seas
  10 to 12 ft. For the Small Craft Advisory, north winds 15 to 25
  kt with gusts up to 30 kt and steep seas 8 to 10 ft. Seas will 
  be due to a mix of short period northerly wind waves and 13 
  seconds period swell from the west-northwest.

* WHERE...The Hazardous Seas Warning is for areas west of the
  coast from Coos Bay southward. The Small Craft Advisory is
  generally for the remainder of the area through the advisory
  period.

* WHEN...For the Hazardous Seas Warning, until 10 AM PST Friday. 
  For the Small Craft Advisory, until 10 PM PST Friday.

* IMPACTS...Very steep, hazardous seas could capsize or damage
  vessels. Steep seas will be hazardous to some small craft,
  especially inexperienced mariners. 

* View the hazard area in detail at https://go.usa.gov/x6hks


PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Hazardous Seas Warning means very steep and hazardous sea
conditions are imminent or occurring. Recreational boaters should
remain in port, or take shelter until waves subside.  Commercial
vessels should prepare for rough seas and consider remaining in
port or taking shelter in port until hazardous seas subside.

A Small Craft Advisory means that winds and seas will create a
potential hazard to smaller vessels and inexperienced mariners.

&&

$$

PZZ376-032300-
/O.EXT.KMFR.SE.W.0078.000000T0000Z-211203T1800Z/
/O.EXT.KMFR.SC.Y.0124.211203T1500Z-211204T0600Z/
Waters from Cape Blanco OR to Pt. St. George CA from 10 to 60 nm-
1002 PM PST Thu Dec 2 2021

...HAZARDOUS SEAS WARNING NOW IN EFFECT UNTIL 10 AM PST FRIDAY...
...SMALL CRAFT ADVISORY NOW IN EFFECT FROM 7 AM TO 10 PM PST
FRIDAY...

* WHAT...For the Hazardous Seas Warning, north winds 20 to 30
  knots with gusts 25 to 35 knots and very steep, hazardous seas
  10 to 14 ft. For the Small Craft Advisory, north winds 15 to 25
  kt with gusts up to 30 kt and steep seas 9 to 11 ft. Seas will 
  be due to a mix of short period northerly wind waves and 13 
  seconds period swell from the west-northwest.

* WHERE...The Hazardous Seas Warning is for all areas through 10
  AM PST Friday. The advisory is for all except the
  southeastern most part of the area. 

* WHEN...For the Hazardous Seas Warning, until 10 AM PST Friday. 
  For the Small Craft Advisory, from 7 AM to 10 PM PST Friday.

* IMPACTS...Very steep, hazardous seas could capsize or damage
  vessels. Steep seas will be hazardous to some small craft,
  especially inexperienced mariners. 

* View the hazard area in detail at https://go.usa.gov/x6hks


PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Hazardous Seas Warning means very steep and hazardous sea
conditions are imminent or occurring. Recreational boaters should
remain in port, or take shelter until waves subside.  Commercial
vessels should prepare for rough seas and consider remaining in
port or taking shelter in port until hazardous seas subside.

A Small Craft Advisory means that winds and seas will create a
potential hazard to smaller vessels and inexperienced mariners.

&&

$$
BTL
Visit us at https://www.weather.gov/Medford
905 
WHUS76 KMFR 031026
MWWMFR

URGENT - MARINE WEATHER MESSAGE
National Weather Service Medford OR
226 AM PST Fri Dec 3 2021

PZZ350-356-032330-
/O.CON.KMFR.SE.W.0078.000000T0000Z-211203T1500Z/
/O.CON.KMFR.SC.Y.0123.000000T0000Z-211204T0600Z/
Coastal waters from Florence to Cape Blanco OR out 10 nm-
Coastal waters from Cape Blanco OR to Pt. St. George CA out 10 nm-
226 AM PST Fri Dec 3 2021

...HAZARDOUS SEAS WARNING REMAINS IN EFFECT UNTIL 7 AM PST THIS
MORNING...
...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 10 PM PST THIS
EVENING...

* WHAT...For the Hazardous Seas Warning, north winds 15 to 25
  knots with gusts to 30 knots and very steep, hazardous seas 
  around 11 ft. For the Small Craft Advisory, north winds 10 to 20
  kt with gusts up to 30 kt and steep seas 8 to 10 ft. Seas will 
  be due to a mix of short period northerly wind waves and 13 
  second period swell from the west-northwest.

* WHERE...The Hazardous Seas Warning is for areas beyond about 5NM
  west of the coast westward from Bandon southward. The Small
  Craft Advisory is in effect for the remainder of the area.
  However, the advisory area will diminish late this morning 
  onward to areas about 5NM west of Cape Blanco and to portions of
  the area north of Cape Blanco west of Bandon and Coos Bay.

* WHEN...For the Hazardous Seas Warning, until 7 AM PST this 
  morning. For the Small Craft Advisory, until 10 PM PST this 
  evening.

* IMPACTS...Very steep and hazardous seas could capsize or 
  damage vessels. Bar crossings will become especially 
  treacherous.

* View the hazard area in detail at https://go.usa.gov/x6hks

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Recreational boaters should remain in port. Commercial vessels
should prepare for very steep seas and consider remaining in port
until conditions improve.

&&

$$

PZZ370-032330-
/O.CON.KMFR.SE.W.0078.000000T0000Z-211203T1800Z/
/O.CON.KMFR.SC.Y.0123.000000T0000Z-211204T0600Z/
Waters from Florence to Cape Blanco OR from 10 to 60 nm-
226 AM PST Fri Dec 3 2021

...HAZARDOUS SEAS WARNING REMAINS IN EFFECT UNTIL 10 AM PST THIS
MORNING...
...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 10 PM PST THIS
EVENING...

* WHAT...For the Hazardous Seas Warning, north winds 20 to 25
  knots with gusts to 30 knots and very steep, hazardous seas 
  around 11 ft. For the Small Craft Advisory, north winds 15 to 25
  kt with gusts up to 30 kt and steep seas 8 to 10 ft. Seas will 
  be due to a mix of short period northerly wind waves and 13 
  seconds period swell from the west-northwest.

* WHERE...The Hazardous Seas Warning is for areas west of the
  coast from Coos Bay southward. The Small Craft Advisory is
  generally for the remainder of the area.

* WHEN...For the Hazardous Seas Warning, until 10 AM PST this 
  morning. For the Small Craft Advisory, until 10 PM PST this 
  evening.

* IMPACTS...Very steep and hazardous seas could capsize or 
  damage vessels. Bar crossings will become especially 
  treacherous.

* View the hazard area in detail at https://go.usa.gov/x6hks

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Recreational boaters should remain in port. Commercial vessels
should prepare for very steep seas and consider remaining in port
until conditions improve.

&&

$$

PZZ376-032330-
/O.CON.KMFR.SE.W.0078.000000T0000Z-211203T1800Z/
/O.CON.KMFR.SC.Y.0124.211203T1500Z-211204T0600Z/
Waters from Cape Blanco OR to Pt. St. George CA from 10 to 60 nm-
226 AM PST Fri Dec 3 2021

...HAZARDOUS SEAS WARNING REMAINS IN EFFECT UNTIL 10 AM PST THIS
MORNING...
...SMALL CRAFT ADVISORY REMAINS IN EFFECT FROM 7 AM THIS MORNING
TO 10 PM PST THIS EVENING...

* WHAT...For the Hazardous Seas Warning, north winds 20 to 30
  knots with gusts to 35 knots and very steep, hazardous seas 10
  to 13 ft. For the Small Craft Advisory, north winds 15 to 25 kt
  with gusts up to 30 kt and steep seas 9 to 11 ft. Seas will be
  due to a mix of short period northerly wind waves and 13 second
  period swell from the west-northwest.

* WHERE...The Hazardous Seas Warning is for most areas. The advisory
  is for all except the southeastern most part of the area.

* WHEN...For the Hazardous Seas Warning, until 10 AM PST this 
  morning. For the Small Craft Advisory, from 7 AM this morning 
  to 10 PM PST this evening.

* IMPACTS...Very steep and hazardous seas could capsize or 
  damage vessels. Bar crossings will become especially 
  treacherous.

* View the hazard area in detail at https://go.usa.gov/x6hks

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Recreational boaters should remain in port. Commercial vessels
should prepare for very steep seas and consider remaining in port
until conditions improve.

&&

$$

Visit us at https://www.weather.gov/Medford
837 
WHUS76 KMFR 031700
MWWMFR

URGENT - MARINE WEATHER MESSAGE
National Weather Service Medford OR
900 AM PST Fri Dec 3 2021

PZZ370-040600-
/O.CON.KMFR.SE.W.0078.000000T0000Z-211203T1800Z/
/O.CON.KMFR.SC.Y.0123.000000T0000Z-211204T0600Z/
Waters from Florence to Cape Blanco OR from 10 to 60 nm-
900 AM PST Fri Dec 3 2021

...HAZARDOUS SEAS WARNING REMAINS IN EFFECT UNTIL 10 AM PST THIS
MORNING...
...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 10 PM PST THIS
EVENING...

* WHAT...For the Hazardous Seas Warning, north winds 15 to 25
  knots and very steep, hazardous seas of 10 to 11 ft. For the
  Small Craft Advisory, north winds 15 to 20 kt with gusts up to
  25 kt and steep seas 9 to 10 ft. Seas will be due to a mix of
  short period northerly wind waves and 12 seconds period swell
  from the west-northwest this morning, becoming swell dominated later
  this afternoon and evening. 

* WHERE...The Hazardous Seas Warning is for areas beyond 10 nm
  from shore south of Bandon. The Small Craft Advisory is 
  generally for the remainder of the area.

* WHEN...For the Hazardous Seas Warning, until 10 AM PST this 
  morning. For the Small Craft Advisory, until 10 PM PST this 
  evening.

* IMPACTS...Very steep and hazardous seas could capsize or 
  damage vessels. Bar crossings will become especially 
  treacherous.

* View the hazard area in detail at https://go.usa.gov/x6hks

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Recreational boaters should remain in port. Commercial vessels
should prepare for very steep seas and consider remaining in port
until conditions improve.

&&

$$

PZZ376-040600-
/O.CON.KMFR.SE.W.0078.000000T0000Z-211203T1800Z/
/O.CON.KMFR.SC.Y.0124.000000T0000Z-211204T0600Z/
Waters from Cape Blanco OR to Pt. St. George CA from 10 to 60 nm-
900 AM PST Fri Dec 3 2021

...HAZARDOUS SEAS WARNING REMAINS IN EFFECT UNTIL 10 AM PST THIS
MORNING...
...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 10 PM PST THIS
EVENING...

* WHAT...For the Hazardous Seas Warning, north winds 20 to 25
  knots and very steep, hazardous seas 10 to 13 ft. For the Small
  Craft Advisory, north winds 15 to 25 kt with gusts up to 30 kt
  and steep seas 9 to 11 ft. Seas will be due to a mix of short
  period northerly wind waves and 12 second period swell from the
  west-northwest, becoming swell dominated later this afternoon 
  and evening. 

* WHERE...The Hazardous Seas Warning is for most areas. The
  advisory is for all except the southeastern most part of the
  area this morning then all areas late this morning through this
  evening.

* WHEN...For the Hazardous Seas Warning, until 10 AM PST this 
  morning. For the Small Craft Advisory, from 7 AM this morning 
  to 10 PM PST this evening.

* IMPACTS...Very steep and hazardous seas could capsize or 
  damage vessels. Bar crossings will become especially 
  treacherous.

* View the hazard area in detail at https://go.usa.gov/x6hks

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Recreational boaters should remain in port. Commercial vessels
should prepare for very steep seas and consider remaining in port
until conditions improve.

&&

$$

PZZ350-356-040600-
/O.CON.KMFR.SC.Y.0123.000000T0000Z-211204T0600Z/
Coastal waters from Florence to Cape Blanco OR out 10 nm-
Coastal waters from Cape Blanco OR to Pt. St. George CA out 10 nm-
900 AM PST Fri Dec 3 2021

...SMALL CRAFT ADVISORY REMAINS IN EFFECT UNTIL 10 PM PST THIS
EVENING...

* WHAT...For the Small Craft Advisory, north winds 10 to 20 kt 
  and steep seas 8 to 10 ft. Seas will be due to a mix of short 
  period northerly wind waves and 12 second period swell from the 
  west-northwest, becoming swell dominated later this afternoon 
  and evening. 

* WHERE...The Small Craft Advisory is in effect for most areas 
  beyond 3 nm from the coast.

* WHEN...For the Hazardous Seas Warning, until 7 AM PST this 
  morning. For the Small Craft Advisory, until 10 PM PST this 
  evening.

* IMPACTS...Gusty winds and/or steep seas could capsize or 
  damage smaller vessels.

* View the hazard area in detail at https://go.usa.gov/x6hks

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Inexperienced mariners and those operating smaller vessels should
remain in port and avoid the area of hazardous conditions.

&&

$$

Visit us at https://www.weather.gov/Medford

What forecasters said that day

The local office's own words before this hazardous seas warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Medford, OR wrote its last area forecast discussion before this hazardous seas warning went out at Nov 30, 9:34 PM PST, 4 hours 13 minutes earlier.

Area forecast discussion, Nov 30, 9:34 PM PST, 4 hours 13 minutes before
Area Forecast Discussion
National Weather Service Medford OR
934 PM PST Tue Nov 30 2021

.DISCUSSION...The forecast has been updated to increase the daily
duration of valley low clouds and fog during the next couple of
days. Though, near shore northeast winds and the passage of a
very weak shortwave trough are expected to cause stratus to
diminish in Coos and northern and central Douglas County from mid-
morning Wednesday into Wednesday evening. Also, there is a
slightly better chance of breaks in the valley stratus during
Wednesday afternoon compared to the past couple of days. Valley
stratus will be on the increase Wednesday evening into Thursday
morning as another weak front reaches our area.

Please see the previous discussion below for further details
regarding a much needed change to a wetter weather pattern early
next week.

&&

.AVIATION...01/00Z TAFs...
Afternoon clearing of low clouds and fog under the continuing
inversion did not completely scour out of the Shasta Valley
southwest of KSIY, from about Medford north and westward in the
Rogue Valley to between Rogue River and Grant Pass, across much of
the Illinois Valley, and for the valleys from Merlin to Galice to
Azalea and Glendale.

Overnight through Wednesday morning low clouds and fog will reform
across many valley areas similarly to how it did in the last 24
hours. East of the Cascades, however, lower dewpoints than 24 hours
ago mean that freezing fog and low clouds will probably be a bit
later in forming and coverage is likely to be a bit less than 24
hours ago.

Tuesday IFR/LIFR conditions in many valleys are likely to clear from
the coast and east side by noon. West of the Cascades, like today,
fog and low clouds are likely to begin to break up on valley edges
late morning, some areas in the afternoon, and other areas, such as
KMFR and Grants Pass, are most likely to only improve to IFR-MVFR.
Outside of the valleys, VFR conditions are expected to prevail
through the period. ~BTL

&&

.MARINE...Updated 825 PM PST Tuesday, November 30th, 2021...
Winds will become northerly over all of the coastal waters area by
sunrise, but are already northerly across all but the northwestern
portion of the area. These northerly winds are likely to be
moderately gusty from Cape Blanco southward tonight into tomorrow,
but especially tomorrow night through Thursday when they're likely
to increase to solid advisory levels. Before that west swell will
build on Wednesday resulting in advisory conditions for all areas.
Thursday through Friday north winds, combined with a building west
swell, are likely to cause seas to become very steep and hazardous
beyond 10NM west of the coast. Seas are likely to remain elevated
into Saturday before subsiding. A weather pattern change to more
active/normal is then expected to bring more frequent impacting
swell conditions, at times next week, beginning Monday. ~BTL

&&

.PREV DISCUSSION... /Issued 405 PM PST Tue Nov 30 2021/

DISCUSSION...There really isn't much to say about the weather for
the next several days. From now through Friday night, the upper
level ridge will be in firm control, keeping the preferred storm
track, and any significant chances of rain, well to our north.
Instead, we will be under mostly clear skies, with the exception
of the valleys of the West Side and the Klamath Basin, where
night and morning fog and low clouds will be the rule.
There is a chance that the valleys could open up and clear through
the week, depending on if periods of easterly winds or the
trailing end of a front can help mix out the air and disrupt the
valley inversions, but confidence on any given day is low. The
best chance of clearing does appear to be tomorrow, however, so
the forecast has been changed a bit to reflect this possibility.

It will be tough for any approaching systems to make inroads
against what amounts to be a rather resilient ridge. The models do
show a much more robust trough forming in the northeastern
Pacific late in the week, then pushing into the coast Saturday and
Sunday as the ridge weakens and shifts to the west. While the
precipitation with this front will once again likely stay to our
north, it will shift the pattern enough to allow for a second
system to arrive early next week.

The ensembles, while agreeing with the general pattern, have several
differences in how this will unfold but the general idea is that an
atmospheric river sets up, originating from the tropics near Hawaii
(a true pineapple express), and funneling it into the northern
Pacific Northwest Saturday, then a more compact low develops, picks
up the residual moisture plume from the departing system, and pushes
that through our area Monday into Tuesday. Lately, we have seen
these systems in the long term forecast dissipate and shift north in
the days leading up to the event, and this certainly is a
possibility, however, with the ensemble suites showing moist onshore
flow from Seattle all the way to southern California, chances are
much better that we will see some active, wet weather, it just
remains to be seen how much rain and wind we can expect. Given the
somewhat wide range of solutions, suspect we will see many updates
in the coming days as the models come to a better consensus and
confidence increases.
-BPN

&&

.MFR WATCHES/WARNINGS/ADVISORIES...
OR...Air Stagnation Advisory until 10 AM PST Friday for ORZ029-030.
     Air Stagnation Advisory until 10 AM PST Friday for ORZ031.
     Air Stagnation Advisory until 10 AM PST Thursday for ORZ024-026.

CA...None.

Pacific Coastal Waters...
     Small Craft Advisory from 10 AM Wednesday to noon PST Friday for
     PZZ350-356-370-376.
     Hazardous Seas Watch from Thursday afternoon through Friday
     morning for PZZ370-376.

DW/BTL

Nearby

Hazardous Seas Warnings in Oregon, 2021Every hazardous seas 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.