Alert archive / Oregon / Hazardous Seas Warnings in 2018

Hazardous Seas Warning 21, NWS Medford, OR

March 11, 2018

NWS Medford, OR issued this hazardous seas warning at Mar 11, 2018, 3:00 PM PDT. It took effect at Mar 12, 2018, 8:00 PM PDT. It was in force for 18 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
Mar 11, 2018, 3:00 PM PDT (22:00 UTC)
In effect from
Mar 12, 2018, 8:00 PM PDT
Expired
Mar 13, 2018, 2:17 PM PDT
In force
18 hr
Issued by
NWS Medford, OR

The text

As transmitted.

526 
WHUS76 KMFR 112200
MWWMFR

URGENT - MARINE WEATHER MESSAGE
National Weather Service Medford OR
300 PM PDT Sun Mar 11 2018

PZZ350-356-121100-
/O.UPG.KMFR.GL.A.0008.180313T0000Z-180314T0000Z/
/O.NEW.KMFR.SE.W.0021.180313T1200Z-180314T0000Z/
/O.NEW.KMFR.GL.W.0014.180313T0600Z-180313T1200Z/
/O.NEW.KMFR.SC.Y.0027.180312T1800Z-180313T1200Z/
/O.NEW.KMFR.SW.Y.0025.180314T0000Z-180315T0000Z/
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-
300 PM PDT Sun Mar 11 2018

...GALE WARNING IN EFFECT FROM 11 PM MONDAY TO 5 AM PDT TUESDAY...
...HAZARDOUS SEAS WARNING IN EFFECT FROM 5 AM TO 5 PM PDT
TUESDAY...

* Winds...Increasing to south 20 to 30 kt Monday night and then 25
  to 35 kt gales Tuesday morning, decreasing 20 to 30 kt Tuesday
  afternoon. 

* Seas...Building to steep 7 feet late Monday afternoon, peaking
  at very steep 10 to 15 feet Tuesday afternoon into Tuesday
  evening.

* Areas affected...Small Craft Advisory conditions will affect
  areas beyond 8NM from Cape Blanco southward late Monday
  afternoon. Gales are expected south of Coos Bay generally 
  beyond 3NM from shore, except to the shore at Cape Blanco. Small
  craft conditions are expected all other areas. Very steep and 
  hazardous seas will follow the gales at all locations. 

* View the hazard area in detail at 
  https://www.wrh.noaa.gov/mfr/hazard 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Gale Warning means winds of 34 to 47 knots are imminent or
occurring. Operating a vessel in gale conditions requires
experience and properly equipped vessels. It is highly
recommended that mariners without the proper experience seek safe
harbor prior to the onset of gale conditions.

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.

&&

$$

PZZ370-121100-
/O.UPG.KMFR.GL.A.0008.180313T0000Z-180314T0000Z/
/O.NEW.KMFR.SE.W.0021.180313T1200Z-180314T0000Z/
/O.NEW.KMFR.SC.Y.0027.180312T1800Z-180313T1200Z/
/O.NEW.KMFR.GL.W.0014.180312T1800Z-180314T0000Z/
/O.NEW.KMFR.SW.Y.0025.180314T0000Z-180315T0000Z/
Waters from Florence to Cape Blanco OR from 10 to 60 nm-
300 PM PDT Sun Mar 11 2018

...GALE WARNING IN EFFECT FROM 11 AM MONDAY TO 5 PM PDT TUESDAY...
...HAZARDOUS SEAS WARNING IN EFFECT FROM 5 AM TO 5 PM PDT
TUESDAY...

* Winds...Increasing to southeast 20 to 30 kt Monday afternoon,
  then increasing to south gales 30 to 35 kt with gusts up to 45
  kt Monday night into Tuesday afternoon.  

* Seas...Building to steep 8 to 10 feet Monday afternoon, then
  very steep 10 to 15 feet Monday night into Tuesday afternoon. 

* Areas affected...Gales will initially affect areas beyond 40NM
  from shore Monday afternoon, with Small Craft Advisory
  conditions affecting other areas. Then, most areas will be
  affected by gales Monday night into Tuesday afternoon.
 
* View the hazard area in detail at 
  https://www.wrh.noaa.gov/mfr/hazard 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Gale Warning means winds of 34 to 47 knots are imminent or
occurring. Operating a vessel in gale conditions requires
experience and properly equipped vessels. It is highly
recommended that mariners without the proper experience seek safe
harbor prior to the onset of gale conditions.

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.

&&

$$

PZZ376-121100-
/O.UPG.KMFR.GL.A.0008.180313T0000Z-180314T0000Z/
/O.NEW.KMFR.SE.W.0021.180313T1200Z-180314T0000Z/
/O.NEW.KMFR.SC.Y.0027.180312T1800Z-180313T0600Z/
/O.NEW.KMFR.GL.W.0014.180312T1800Z-180313T1200Z/
/O.NEW.KMFR.SW.Y.0025.180314T0000Z-180315T0000Z/
Waters from Cape Blanco OR to Pt. St. George CA from 10 to 60 nm-
300 PM PDT Sun Mar 11 2018

...GALE WARNING IN EFFECT FROM 11 AM MONDAY TO 5 AM PDT TUESDAY...
...HAZARDOUS SEAS WARNING IN EFFECT FROM 5 AM TO 5 PM PDT
TUESDAY...

* Winds...Increasing to south 20 to 30 kt Monday afternoon, then
  increasing further to south gales 30 to 35 kt with gusts up to
  45 kt Monday evening through early Tuesday morning. 

* Seas...Building to steep 8 to 10 feet Monday afternoon then very
  steep and hazardous 10 to 14 feet Monday evening through Tuesday
  afternoon. 

* Areas affected...Gales will affect areas beyond 30 NM from shore
  Monday afternoon into Monday evening, with Small Craft Advisory
  conditions elsewhere. Then gales will affect all areas Monday
  night. Very steep hazardous seas will affect all areas on
  Tuesday. 

* View the hazard area in detail at 
  https://www.wrh.noaa.gov/mfr/hazard 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Gale Warning means winds of 34 to 47 knots are imminent or
occurring. Operating a vessel in gale conditions requires
experience and properly equipped vessels. It is highly
recommended that mariners without the proper experience seek safe
harbor prior to the onset of gale conditions.

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.

&&

$$


http://www.weather.gov/medford
6 follow-up statements
329 
WHUS76 KMFR 112209
MWWMFR

URGENT - MARINE WEATHER MESSAGE
National Weather Service Medford OR
309 PM PDT Sun Mar 11 2018

PZZ350-356-121115-
/O.CON.KMFR.SC.Y.0027.180312T1800Z-180313T1200Z/
/O.CON.KMFR.GL.W.0014.180313T0600Z-180313T1200Z/
/O.CON.KMFR.SE.W.0021.180313T1200Z-180314T0000Z/
/O.CON.KMFR.SW.Y.0025.180314T0000Z-180315T0000Z/
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-
309 PM PDT Sun Mar 11 2018

...SMALL CRAFT ADVISORY IN EFFECT FROM 11 AM MONDAY TO 11 PM
MONDAY...
...GALE WARNING REMAINS IN EFFECT FROM 11 PM MONDAY TO 5 AM PDT
TUESDAY...
...HAZARDOUS SEAS WARNING REMAINS IN EFFECT FROM 5 AM TO 5 PM PDT
TUESDAY...

* Winds...Increasing to south 20 to 30 kt Monday night and then 
  25 to 35 kt gales Tuesday morning, decreasing 20 to 30 kt 
  Tuesday afternoon. 

* Seas...Building to steep 7 feet late Monday afternoon, peaking 
  at very steep 10 to 15 feet Tuesday afternoon into Tuesday 
  evening. 

* Areas affected...Small Craft Advisory conditions will affect 
  areas beyond 8NM from Cape Blanco southward late Monday 
  afternoon. Gales are expected south of Coos Bay generally 
  beyond 3NM from shore, except to the shore at Cape Blanco. 
  Small craft conditions are expected all other areas. Very 
  steep and hazardous seas will follow the gales at all 
  locations. 

* View the hazard area in detail at 
  https://www.wrh.noaa.gov/mfr/hazard 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Gale Warning means winds of 34 to 47 knots are imminent or
occurring. Operating a vessel in gale conditions requires
experience and properly equipped vessels. It is highly
recommended that mariners without the proper experience seek safe
harbor prior to the onset of gale conditions.

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.

&&

$$

PZZ370-121115-
/O.CON.KMFR.GL.W.0014.180312T1800Z-180314T0000Z/
/O.CON.KMFR.SC.Y.0027.180312T1800Z-180313T1200Z/
/O.CON.KMFR.SE.W.0021.180313T1200Z-180314T0000Z/
/O.CON.KMFR.SW.Y.0025.180314T0000Z-180315T0000Z/
Waters from Florence to Cape Blanco OR from 10 to 60 nm-
309 PM PDT Sun Mar 11 2018

...GALE WARNING REMAINS IN EFFECT FROM 11 AM MONDAY TO 5 PM PDT
TUESDAY...
...HAZARDOUS SEAS WARNING REMAINS IN EFFECT FROM 5 AM TO 5 PM PDT
TUESDAY...

* Winds...Increasing to southeast 20 to 30 kt Monday afternoon, 
  then increasing to south gales 30 to 35 kt with gusts up to 45 
  kt Monday night into Tuesday afternoon. 

* Seas...Building to steep 8 to 10 feet Monday afternoon, then 
  very steep 10 to 15 feet Monday night into Tuesday afternoon. 

* Areas affected...Gales will initially affect areas beyond 40NM 
  from shore Monday afternoon, with Small Craft Advisory 
  conditions affecting other areas. Then, most areas will be 
  affected by gales Monday night into Tuesday afternoon. 

* View the hazard area in detail at 
  https://www.wrh.noaa.gov/mfr/hazard 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Gale Warning means winds of 34 to 47 knots are imminent or
occurring. Operating a vessel in gale conditions requires
experience and properly equipped vessels. It is highly
recommended that mariners without the proper experience seek safe
harbor prior to the onset of gale conditions.

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.

&&

$$

PZZ376-121115-
/O.CON.KMFR.GL.W.0014.180312T1800Z-180313T1200Z/
/O.CON.KMFR.SC.Y.0027.180312T1800Z-180313T0600Z/
/O.CON.KMFR.SE.W.0021.180313T1200Z-180314T0000Z/
/O.CON.KMFR.SW.Y.0025.180314T0000Z-180315T0000Z/
Waters from Cape Blanco OR to Pt. St. George CA from 10 to 60 nm-
309 PM PDT Sun Mar 11 2018

...GALE WARNING REMAINS IN EFFECT FROM 11 AM MONDAY TO 5 AM PDT
TUESDAY...
...HAZARDOUS SEAS WARNING REMAINS IN EFFECT FROM 5 AM TO 5 PM PDT
TUESDAY...

* Winds...Increasing to south 20 to 30 kt Monday afternoon, then 
  increasing further to south gales 30 to 35 kt with gusts up to 
  45 kt Monday evening through early Tuesday morning. 

* Seas...Building to steep 8 to 10 feet Monday afternoon then 
  very steep and hazardous 10 to 14 feet Monday evening through 
  Tuesday afternoon. 

* Areas affected...Gales will affect areas beyond 30 NM from 
  shore Monday afternoon into Monday evening, with Small Craft 
  Advisory conditions elsewhere. Then gales will affect all 
  areas Monday night. Very steep hazardous seas will affect all 
  areas on Tuesday. 

* View the hazard area in detail at 
  https://www.wrh.noaa.gov/mfr/hazard 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Gale Warning means winds of 34 to 47 knots are imminent or
occurring. Operating a vessel in gale conditions requires
experience and properly equipped vessels. It is highly
recommended that mariners without the proper experience seek safe
harbor prior to the onset of gale conditions.

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.

&&

$$


http://www.weather.gov/medford
069 
WHUS76 KMFR 121120
MWWMFR

URGENT - MARINE WEATHER MESSAGE
National Weather Service Medford OR
420 AM PDT Mon Mar 12 2018


PZZ350-356-130030-
/O.CON.KMFR.SC.Y.0027.180312T1800Z-180313T1200Z/
/O.CON.KMFR.GL.W.0014.180313T0600Z-180313T1200Z/
/O.CON.KMFR.SE.W.0021.180313T1200Z-180314T0000Z/
/O.CON.KMFR.SW.Y.0025.180314T0000Z-180315T0000Z/
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-
420 AM PDT Mon Mar 12 2018

...GALE WARNING REMAINS IN EFFECT FROM 11 PM THIS EVENING TO 5 AM
PDT TUESDAY...
...HAZARDOUS SEAS WARNING REMAINS IN EFFECT FROM 5 AM TO 5 PM PDT
TUESDAY...

* Winds...South 20 to 25 kt tonight and then 25 to 30 kt Tuesday
  morning, gusting to 35 kt.

* Seas...Building to steep 7 to 9 feet this evening, then peaking
  at very steep 10 to 15 feet Tuesday afternoon into Tuesday 
  evening.
 
* Areas affected...Small Craft Advisory conditions will affect 
  areas beyond 8NM from Cape Blanco southward late Monday 
  afternoon. Gales are expected south of Coos Bay generally 
  beyond 3NM from shore, except to the shore at Cape Blanco. 
  Small craft conditions are expected all other areas. Very 
  steep and hazardous seas will follow the gales at all 
  locations. 

* View the hazard area in detail at 
  https://www.wrh.noaa.gov/mfr/hazard 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Gale Warning means winds of 34 to 47 knots are imminent or
occurring. Operating a vessel in gale conditions requires
experience and properly equipped vessels. It is highly
recommended that mariners without the proper experience seek safe
harbor prior to the onset of gale conditions.

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.

&&

$$

PZZ370-130030-
/O.CON.KMFR.GL.W.0014.180312T1800Z-180314T0000Z/
/O.CON.KMFR.SC.Y.0027.180312T1800Z-180313T1200Z/
/O.CON.KMFR.SE.W.0021.180313T1200Z-180314T0000Z/
/O.CON.KMFR.SW.Y.0025.180314T0000Z-180315T0000Z/
Waters from Florence to Cape Blanco OR from 10 to 60 nm-
420 AM PDT Mon Mar 12 2018

...GALE WARNING REMAINS IN EFFECT FROM 11 AM THIS MORNING TO 5 PM
PDT TUESDAY...
...HAZARDOUS SEAS WARNING REMAINS IN EFFECT FROM 5 AM TO 5 PM PDT
TUESDAY...

* Winds...Southeast 15 to 20 this afternoon, then 20 to 30 kt by 
  this evening, then south gales 30 to 35 kt with gusts up to 45 
  kt tonight into Tuesday afternoon.

* Seas...Building to steep 8 to 10 feet this afternoon, then very
  steep 12 to 17 feet tonight into Tuesday afternoon. 

* Areas affected...Gales will initially affect areas beyond 40NM
  from shore this afternoon, with Small Craft Advisory conditions
  affecting other areas. Then, most areas will be affected by 
  gales tonight into Tuesday afternoon. 

* View the hazard area in detail at 
  https://www.wrh.noaa.gov/mfr/hazard 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Gale Warning means winds of 34 to 47 knots are imminent or
occurring. Operating a vessel in gale conditions requires
experience and properly equipped vessels. It is highly
recommended that mariners without the proper experience seek safe
harbor prior to the onset of gale conditions.

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.

&&

$$

PZZ376-130030-
/O.CON.KMFR.GL.W.0014.180312T1800Z-180313T1200Z/
/O.CON.KMFR.SC.Y.0027.180312T1800Z-180313T0600Z/
/O.CON.KMFR.SE.W.0021.180313T1200Z-180314T0000Z/
/O.CON.KMFR.SW.Y.0025.180314T0000Z-180315T0000Z/
Waters from Cape Blanco OR to Pt. St. George CA from 10 to 60 nm-
420 AM PDT Mon Mar 12 2018

...GALE WARNING REMAINS IN EFFECT FROM 11 AM THIS MORNING TO 5 AM
PDT TUESDAY...
...HAZARDOUS SEAS WARNING REMAINS IN EFFECT FROM 5 AM TO 5 PM PDT
TUESDAY...

* Winds...Increasing to south 20 to 30 kt this evening, then
  increasing further to south gales 30 to 35 kt with gusts up to
  45 kt tonight through early Tuesday morning. 

* Seas...Building to steep 8 to 10 feet this afternoon then very
  steep and hazardous 11 to 14 this evening through Tuesday 
  afternoon. 

* Areas affected...Gales will affect areas beyond 30 NM from shore
  this afternoon into this evening, with Small Craft Advisory
  conditions elsewhere. Then gales will affect all areas tonight.
  Very steep hazardous seas will affect all areas Tuesday. 

* View the hazard area in detail at 
  https://www.wrh.noaa.gov/mfr/hazard 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Gale Warning means winds of 34 to 47 knots are imminent or
occurring. Operating a vessel in gale conditions requires
experience and properly equipped vessels. It is highly
recommended that mariners without the proper experience seek safe
harbor prior to the onset of gale conditions.

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.

&&

$$


http://www.weather.gov/medford
483 
WHUS76 KMFR 122118
MWWMFR

URGENT - MARINE WEATHER MESSAGE
National Weather Service Medford OR
218 PM PDT Mon Mar 12 2018

PZZ350-356-131030-
/O.CAN.KMFR.SC.Y.0027.000000T0000Z-180313T1200Z/
/O.NEW.KMFR.SW.Y.0026.180313T0300Z-180313T0900Z/
/O.EXT.KMFR.SE.W.0021.180313T0300Z-180314T0000Z/
/O.CAN.KMFR.GL.W.0014.180313T0600Z-180313T1200Z/
/O.EXT.KMFR.SW.Y.0025.180314T0000Z-180314T1800Z/
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-
218 PM PDT Mon Mar 12 2018

...HAZARDOUS SEAS WARNING NOW IN EFFECT FROM 8 PM THIS EVENING TO
5 PM PDT TUESDAY...

The Gale Warning has been cancelled. 

* Winds...Increasing to south 20 to 30 kt with gusts to 35 kt
  after midnight the diminishing below 20 kt by Tuesday afternoon.

* Seas...Building to steep to very steep 7 to 10 feet this
  evening. Then a combination of wind waves, fresh swell, and
  longer period northwest swell will result in seas peaking at 
  very steep 10 to 14 feet late tonight into Tuesday afternoon. 
  Seas subside below 10 feet Wednesday afternoon.

* Areas affected...Warning level seas will first affect areas in
  between Bandon and Brookings beyond 5 NM from shore, with Small
  Craft Advisory conditions affecting other areas except from
  North Bend northward. Warning level seas then expand to affect
  all areas late tonight into Tuesday afternoon. 

* View the hazard area in detail at 
  https://www.wrh.noaa.gov/mfr/hazard 

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 for hazardous seas means that waves will
be steep enough to create a potential hazard to smaller vessels
and inexperienced mariners.

&&

$$

PZZ370-131030-
/O.EXT.KMFR.GL.W.0014.000000T0000Z-180313T0900Z/
/O.EXT.KMFR.SC.Y.0027.000000T0000Z-180313T0300Z/
/O.NEW.KMFR.SW.Y.0026.180313T0300Z-180313T0900Z/
/O.EXT.KMFR.SE.W.0021.180313T0300Z-180314T0000Z/
/O.EXT.KMFR.SW.Y.0025.180314T0000Z-180314T1800Z/
Waters from Florence to Cape Blanco OR from 10 to 60 nm-
218 PM PDT Mon Mar 12 2018

...GALE WARNING NOW IN EFFECT UNTIL 2 AM PDT TUESDAY...
...HAZARDOUS SEAS WARNING NOW IN EFFECT FROM 8 PM THIS EVENING TO
5 PM PDT TUESDAY...

The National Weather Service in Medford has issued a Small Craft
Advisory for hazardous seas...which is in effect from 8 PM this
evening to 2 AM PDT Tuesday. 

* Winds...Increasing to southeast to south 25 to 35 kt gales with
  gusts to 40 kt this afternoon, then south 20 to 30 kt late tonight.
 
* Seas...Building to very steep 10 to 13 feet late this 
  afternoon, then peaking at very steep 12 to 14 feet tonight and 
  Tuesday morning due to a combination of wind waves, fresh swell,
  and building northwest longer period swell. 

* Areas affected...Gales will affect areas mostly beyond 30 NM
  from shore this afternoon, with small craft advisory conditions
  affecting most other areas, transitioning to very steep
  hazardous seas tonight. All areas will see very steep hazardous
  warning seas early Tuesday morning through Tuesday afternoon.

* View the hazard area in detail at 
  https://www.wrh.noaa.gov/mfr/hazard 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Gale Warning means winds of 34 to 47 knots are imminent or
occurring. Operating a vessel in gale conditions requires
experience and properly equipped vessels. It is highly
recommended that mariners without the proper experience seek safe
harbor prior to the onset of gale conditions.

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.

A Small Craft Advisory for hazardous seas means that waves will
be steep enough to create a potential hazard to smaller vessels
and inexperienced mariners.

&&

$$

PZZ376-131030-
/O.EXT.KMFR.GL.W.0014.000000T0000Z-180313T0900Z/
/O.EXT.KMFR.SC.Y.0027.000000T0000Z-180313T0300Z/
/O.EXT.KMFR.SE.W.0021.180313T0300Z-180314T0000Z/
/O.EXT.KMFR.SW.Y.0025.180314T0000Z-180314T1800Z/
Waters from Cape Blanco OR to Pt. St. George CA from 10 to 60 nm-
218 PM PDT Mon Mar 12 2018

...GALE WARNING NOW IN EFFECT UNTIL 2 AM PDT TUESDAY...
...HAZARDOUS SEAS WARNING NOW IN EFFECT FROM 8 PM THIS EVENING TO
5 PM PDT TUESDAY...

* Winds...Increasing to south 25 to 35 kt gales with gusts to 40
  kt this afternoon through this evening. South 25 to 30 kt winds
  are expected late tonight, then less than 20 kt by Tuesday
  afternoon. 

* Seas...Building to very steep 10 to 13 feet late this 
  afternoon, then peaking at very steep 12 to 14 feet tonight and 
  Tuesday morning due to a combination of wind waves, fresh swell,
  and building northwest longer period swell. 

* Areas affected...Gales will affect areas mostly beyond 20 NM 
  from shore this afternoon, with small craft advisory conditions 
  affecting most other areas, transitioning to very steep 
  hazardous seas tonight. All areas will see very steep hazardous 
  warning seas early Tuesday morning through Tuesday afternoon.

* View the hazard area in detail at 
  https://www.wrh.noaa.gov/mfr/hazard 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Gale Warning means winds of 34 to 47 knots are imminent or
occurring. Operating a vessel in gale conditions requires
experience and properly equipped vessels. It is highly
recommended that mariners without the proper experience seek safe
harbor prior to the onset of gale conditions.

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.

&&

$$


http://www.weather.gov/medford
989 
WHUS76 KMFR 130615
MWWMFR

URGENT - MARINE WEATHER MESSAGE
National Weather Service Medford OR
1115 PM PDT Mon Mar 12 2018

PZZ370-131915-
/O.CON.KMFR.GL.W.0014.000000T0000Z-180313T0900Z/
/O.CON.KMFR.SE.W.0021.000000T0000Z-180314T0000Z/
/O.CON.KMFR.SW.Y.0026.000000T0000Z-180313T0900Z/
/O.CON.KMFR.SW.Y.0025.180314T0000Z-180314T1800Z/
Waters from Florence to Cape Blanco OR from 10 to 60 nm-
1115 PM PDT Mon Mar 12 2018

...GALE WARNING REMAINS IN EFFECT UNTIL 2 AM PDT TUESDAY...
...HAZARDOUS SEAS WARNING REMAINS IN EFFECT UNTIL 5 PM PDT
TUESDAY...
...SMALL CRAFT ADVISORY FOR HAZARDOUS SEAS REMAINS IN EFFECT FROM
5 PM TUESDAY TO 11 AM PDT WEDNESDAY...

* Winds...Southeast gales 30 to 35 kt with gusts to 40 kt tonight, then
  south 20 to 30 kt late tonight. 

* Seas...very steep 12 to 14 feet tonight into Tuesday, slowly
  subsiding to around 12 feet by Wednesday.

* Areas affected...Gales will affect areas mostly beyond 30 NM
  from shore, with small craft advisory conditions affecting other
  areas. All areas will see very steep hazardous warning seas 
  early Tuesday morning through Tuesday afternoon. 

* View the hazard area in detail at 
  https://www.wrh.noaa.gov/mfr/hazard 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Gale Warning means winds of 34 to 47 knots are imminent or
occurring. Operating a vessel in gale conditions requires
experience and properly equipped vessels. It is highly
recommended that mariners without the proper experience seek safe
harbor prior to the onset of gale conditions.

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.

A Small Craft Advisory for hazardous seas means that waves will
be steep enough to create a potential hazard to smaller vessels
and inexperienced mariners.

&&

$$

PZZ376-131915-
/O.CON.KMFR.GL.W.0014.000000T0000Z-180313T0900Z/
/O.CON.KMFR.SE.W.0021.000000T0000Z-180314T0000Z/
/O.CON.KMFR.SW.Y.0025.180314T0000Z-180314T1800Z/
Waters from Cape Blanco OR to Pt. St. George CA from 10 to 60 nm-
1115 PM PDT Mon Mar 12 2018

...GALE WARNING REMAINS IN EFFECT UNTIL 2 AM PDT TUESDAY...
...HAZARDOUS SEAS WARNING REMAINS IN EFFECT UNTIL 5 PM PDT
TUESDAY...
...SMALL CRAFT ADVISORY FOR HAZARDOUS SEAS REMAINS IN EFFECT FROM
5 PM TUESDAY TO 11 AM PDT WEDNESDAY...

* Winds...southeast gales 30 to 35 kt with gusts to 40 kt tonight,
  decreasing to south 25 to 30 kt late tonight, then less than 20
  kt by Tuesday afternoon. 

* Seas...very steep 12 to 14 feet through Tuesday afternoon with
  slow decrease to 10 to 12 feet Tuesday night. 

* Areas affected...Gales will affect areas mostly beyond 30 NM
  from shore, with small craft advisory conditions affecting most
  other areas. By late tonight all areas will see very steep
  hazardous warning seas through Tuesday afternoon. 

* View the hazard area in detail at 
  https://www.wrh.noaa.gov/mfr/hazard 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Gale Warning means winds of 34 to 47 knots are imminent or
occurring. Operating a vessel in gale conditions requires
experience and properly equipped vessels. It is highly
recommended that mariners without the proper experience seek safe
harbor prior to the onset of gale conditions.

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.

&&

$$

PZZ350-356-131915-
/O.CON.KMFR.SE.W.0021.000000T0000Z-180314T0000Z/
/O.CON.KMFR.SW.Y.0026.000000T0000Z-180313T0900Z/
/O.CON.KMFR.SW.Y.0025.180314T0000Z-180314T1800Z/
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-
1115 PM PDT Mon Mar 12 2018

...HAZARDOUS SEAS WARNING REMAINS IN EFFECT UNTIL 5 PM PDT
TUESDAY...
...SMALL CRAFT ADVISORY FOR HAZARDOUS SEAS REMAINS IN EFFECT FROM
5 PM TUESDAY TO 11 AM PDT WEDNESDAY...

* Seas...very steep 10 to 12 feet late tonight into Tuesday 
  afternoon. Seas subside below 10 feet Wednesday afternoon. 

* Areas affected...Warning level seas will first affect areas in 
  between Bandon and Brookings beyond 5 NM from shore, with 
  Small Craft Advisory conditions affecting other areas except 
  from North Bend northward. Warning level seas then expand to 
  affect all areas late tonight into Tuesday afternoon. 

* View the hazard area in detail at 
  https://www.wrh.noaa.gov/mfr/hazard 

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 for hazardous seas means that waves will
be steep enough to create a potential hazard to smaller vessels
and inexperienced mariners.

&&

$$


http://www.weather.gov/medford
278 
WHUS76 KMFR 130949
MWWMFR

URGENT - MARINE WEATHER MESSAGE
National Weather Service Medford OR
249 AM PDT Tue Mar 13 2018

PZZ350-356-370-376-132300-
/O.EXT.KMFR.SE.W.0021.000000T0000Z-180314T0600Z/
/O.EXT.KMFR.SW.Y.0025.180314T0600Z-180315T0000Z/
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-
Waters from Cape Blanco OR to Pt. St. George CA from 10 to 60 nm-
249 AM PDT Tue Mar 13 2018

...HAZARDOUS SEAS WARNING NOW IN EFFECT UNTIL 11 PM PDT THIS
EVENING...
...SMALL CRAFT ADVISORY FOR HAZARDOUS SEAS NOW IN EFFECT FROM
11 PM THIS EVENING TO 5 PM PDT WEDNESDAY...

* Seas...Very steep and wind driven at 12 to 14 feet through this
  evening, becoming west 11 to 13 feet at 12 seconds tonight
  through Wednesday.
 
* Winds...South 25 to 30 kt with gusts up to 40 kt. 

* Areas affected...All areas will be impacted by very steep and
  hazardous seas through this evening, followed by small craft
  advisory conditions through Wednesday. 

* View the hazard area in detail at 
  https://www.wrh.noaa.gov/mfr/hazard 

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 for hazardous seas means that waves will
be steep enough to create a potential hazard to smaller vessels
and inexperienced mariners.

&&

$$


http://www.weather.gov/medford
631 
WHUS76 KMFR 132117
MWWMFR

URGENT - MARINE WEATHER MESSAGE
National Weather Service Medford OR
217 PM PDT Tue Mar 13 2018

PZZ350-356-370-376-141030-
/O.CAN.KMFR.SE.W.0021.000000T0000Z-180314T0600Z/
/O.EXT.KMFR.SW.Y.0025.180313T2117Z-180315T0000Z/
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-
Waters from Cape Blanco OR to Pt. St. George CA from 10 to 60 nm-
217 PM PDT Tue Mar 13 2018

...SMALL CRAFT ADVISORY FOR HAZARDOUS SEAS NOW IN EFFECT UNTIL
5 PM PDT WEDNESDAY...

The National Weather Service in Medford has cancelled the
Hazardous Seas Warning. 

* Seas...Fresh southerly swell and building longer period west
  swell will combine for steep seas at 10 to 13 feet through
  Wednesday. Seas will peak tonight and subside Wednesday
  afternoon.

* Areas affected...All areas will be impacted by steep seas.

* View the hazard area in detail at 
  https://www.wrh.noaa.gov/mfr/hazard 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Small Craft Advisory for hazardous seas means that waves will
be steep enough to create a potential hazard to smaller vessels
and inexperienced mariners.

&&

$$


http://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 Mar 11, 11:15 AM PDT, 3 hours 45 minutes earlier.

Area forecast discussion, Mar 11, 11:15 AM PDT, 3 hours 45 minutes before
Area Forecast Discussion
National Weather Service Medford OR
1115 AM PDT Sun Mar 11 2018

.Updated aviation discussion.

.DISCUSSION...Made some minor updates this morning to winds for
this afternoon. Near term, high resolution models are showing east
to southeast flow increasing this afternoon over the Cascades and
Siskiyous and this will funnel into the southern end of the Rogue
Valley. Winds won't be anything troublesome, but it will be a
breezy day for the northwest-southeast oriented valleys and the
higher terrain. So have brought wind grids more in line with these
models.

Fog and low clouds have filled the interior valleys this morning and
coastal stratus hugs the coast north of Cape Blanco. These low
clouds will burn off later this morning, and once skies clear,
temperatures will climb leaving a warm, dry spring-like day for
the area.

The main focus for the forecast package this afternoon will be on
the upcoming transition to cooler, active weather starting with a
system approaching the coast Monday afternoon. For more details
on this system, see the previous discussion below. /BR-y

&&

.AVIATION...11/18Z TAF CYCLE...Enough changes should occur between
now and tomorrow morning so that fog and low clouds should not have
as much coverage or duration tonight compared to last night.
Sunshine and warmth should dry up the soil some, and winds aloft
will begin to increase significantly. Thus, we expect most locations
to remain VFR through tomorrow. Only moderate confidence exists in
the TAFs at North Bend and Roseburg, where we are forecast VFR or
MVFR, but conditions could degrade to IFR late tonight. We have
higher confidence that Medford and Klamath Falls will remain VFR
through tomorrow. SK

&&

.MARINE...Updated 730 AM PDT Sunday 11 Mar 2018...Relatively
calm winds and seas will continue today, then start changing early
Monday as a strong low pressure system shifts toward the coast from
the southwest. Winds and seas will approach small craft advisory
conditions in the southern outer waters Monday afternoon...then by
midnight, expect southerly gales to have spread throughout the
marine waters. There is some potential for a period of storm force
winds Monday night. Gales and very steep seas will persist Tuesday
afternoon, then winds will start diminishing. Seas will remain very
steep and hazardous from fresh swell and a steep west swell train
through Tuesday night. Wednesday, seas will subside but likely
remain hazardous to small craft until Friday due to persisting swell
and unsettled weather in the region. -MSC/SK

&&

.PREV DISCUSSION... /Issued 500 AM PDT Sun Mar 11 2018/

SHORT TERM...Minor changes were made this morning, mainly to
tweak wind and precipitation forecasts for the front Monday night
into Tuesday.

As expected, showers have ended and skies are clearing from the
south this morning. Boundary layer moisture remains abundant in
the valleys, and this will lead to another round of fog for many
areas. Fog has already formed in the Umpqua Basin and along
portions of the coast, but based on cameras, it doesn't look
terribly dense just yet. Although there isn't any sign of fog yet
outside the door here in Medford, there isn't much reason to think
we won't see some, as we often do, by dawn. It remains to be seen
how dense the fog will be, so we haven't put out an advisory just
yet. We'll keep a close eye on that, and issue one if dense fog
becomes imminent.

Once this fog burns off, today will be mostly sunny with spring-
like temperatures as an upper ridge briefly develops overhead.
We're still on track to see temperatures 5-10 degrees above normal
today - that is, upper 60s on the west side and upper 50s east of
the Cascades. Tonight will be quiet and seasonably cool under
mostly clear skies, at least early on. We could easily see fog
again tonight, but the coverage will hinge on how much, if at all,
the sun is able to dry the airmass.

Things start to change tomorrow as a strong frontal system
approaches from the west. We'll probably see increasing high
clouds tomorrow, but the most noticeable change may be the
increasing south-southeast winds during the afternoon. The airmass
remains warm tomorrow, and this will produce another warm day,
especially where winds downslope (such as the Rogue Valley). The
flip side of that is that winds upslope in some areas (such as
around Mt. Shasta), and this will produce increasing chances for
rain through the day.

The front approaches the coast Monday night and then moves onshore
Tuesday morning. At the same time, a large upper trough remains
offshore with spokes of energy and associated surface lows
rotating around it through Tuesday night into Wednesday morning.
This complicates the wind forecast, because timing and strength of
these lows will be important, and models still show differences in
all that.

Wind will probably blow all Monday night through the Shasta
Valley and into at least the southern end of the Rogue Valley
around Ashland, and this will hold temperatures up. Often times,
Medford itself decouples and winds die down at night, but even
light winds will probably result in a warmer than normal night. As
far as wind speed is concerned, this certainly looks like it will
be worthy of a high wind warning in the Shasta Valley, and a high
wind watch remains in effect there. Elsewhere, widespread
advisory level winds are probable, and high winds may be realized
in some locations like over the mountains and portions of the east
side. Speaking of the east side, strong winds will be possible
from Monday afternoon all the way through Tuesday evening.
Confidence in these details is not high, so we've held off on
issuing any watches at this time. These details should come into
focus soon.

The important thing for residents and travelers to remember is
that breezy to windy conditions are possible from Monday afternoon
through Tuesday afternoon just about everywhere in our forecast
area.

Lastly, this does not look like a prolonged atmospheric river
event for coastal areas. There will be periods of heavy rain, for
sure, but it doesn't seem to linger too long in any one location.
The exception may be in central Siskiyou County where prolonged,
moist, upslope flow is possible for much of Monday night and
Tuesday. The good news there is that snow levels will be
relatively high which limits snow impacts to the highest
elevations, well above cities and most roads. -Wright

LONG TERM...Wednesday through next Saturday. Wednesday morning
starts with the GFS showing a deep closed upper level low out
beyond 130W while the ECMWF is showing a upper level trough at
this time. The GFS operational run with the closed low is the
outlier with only a couple of GFS ensemble plots indication this,
while the ECMWF plots are in much better agreement with the
ensemble means of both the GFS and ECMWF and so am leaning towards
the ECMWF at this time in this time frame. The main difference is
that the winds are 180 degrees out in the coastal waters with the
GFS wrapping winds wrapping around a very deep low directly
beneath the upper level low that is already indicated as an
outlier, and have leaned towards the ECMWF solution. The wrap
around the low will see moisture brought up from the south into
the cooler air mass being brought down aloft bringing the snow
level down to bring good round of snow to the mountains in extreme
SW Oregon and Siskiyou county Wednesday and Thursday.

The operation models come into agreement with each other and the
ensemble means by Thursday afternoon, bringing a closed low down
inside of 130W off of Cape Mendocino. The EC is showing a
secondary low over eastern Washington, with the upper divergence
to the NE of the closed low being distorted by the low to the NE
and the GFS placing the upper level divergence over our forecast
area. With this uncertainty have gone with ensemble MOS pops in
the Thursday- Friday period. Friday is seeing the GFS brings the
center of the closed low just off of Cape Mendocino while the GFS
brings the center of the low just inside of 130W off of the bay
area. The model ensemble plots become very "messy" on the tail end
of the extended, with differing solutions on path, locations and
depth of the lows that wobble slowly southward, and have gone with
the ensemble MOS low pops for the tail end of the extended. Sven

&&

.MFR WATCHES/WARNINGS/ADVISORIES...
OR...None.

CA...High Wind Watch from Monday evening through Tuesday morning for
     CAZ081.

Pacific Coastal Waters...Gale Watch from Monday afternoon through
Tuesday afternoon for      PZZ350-356-370-376.

MNF/TRW/MSC/SK

The office that day

Everything else NWS Medford, OR issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 11, 3:00 PM PDTGale WarningMFR35 hr
Mar 11, 3:00 PM PDTSmall Craft AdvisoryMFR29 hr
Mar 11, 3:00 PM PDTSmall Craft Advisory for Hazardous SeasMFR3 days
Mar 11, 3:01 PM PDTHigh Wind WarningMFRLake50 hr
Mar 11, 3:01 PM PDTWind AdvisoryMFRJackson, Klamath, Lake50 hr

Nearby

Hazardous Seas Warnings in Oregon, 2018Every hazardous seas warning in 2018

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text.