Bruce’s Briefs: Wx for 12, 13, 14, 15, and 16 April. Sloop Tavern Blakley Rock Race, Plus plenty of sailing all over the Salish Sea and a perfect weekend for it!

Bruce’s Briefs: Wx for 12, 13, 14, 15, and 16 April. Sloop Tavern Blakley Rock Race, Plus plenty of sailing all over the Salish Sea and a perfect weekend for it!

Wind from the north, temps in the 60’s, flowers starting to bloom, all good signs. This weekend should be great. Then there’s Monday where the high temp will be almost 15˚F lower than Sunday. Still no real rain on the horizon and as of today, we are almost an inch behind for the month.

Today’s surface analysis chart and sat pic provide a beautiful picture of what is going on in the Salish Sea. We’ve had the passage of a weak cold front this morning and behind this, a ridge of high pressure will start building over the area. This can already be seen by the strong northerly flow down the Strait of Georgia, through the San Juan Islands, and into Puget Sound. As with this classic situation, the best day for breeze is immediately after frontal passage. The best part is that while there may be some easing in the breeze tomorrow, there will be plenty to race with, just about everywhere. The only exception being Olympia which will remain light.

Today’s sat pic shows the clearing starting to develop over the area as well as that big low-pressure system off the coast of Oregon. It is also interesting to note on the 500MB charts that this low intrudes into the upper levels of the atmosphere. The jet stream remains to the south of this low and will drag this weakening low into California by Sunday/Monday. This is why we’ll have such a nice weekend.

The north wind course for the Blakely Rock Benefit Race can be challenging because of the proximity of the weather mark (Meadow Point) to the starting line. Particularly if there’s a flood tide. With the slower boats starting first sometimes there can be congestion at the mark. Luckily tides should not be much of an issue as a max ebb of less than half a knot will be around 1000 hrs, with the slack at around 1230 hrs. With a persistent northerly of 10-15 knots blowing overnight and then building to 15-20 knots by the time the race starts, the flood may start early by 15-25 minutes. Just watch the classes ahead to see if congestion develops at the mark.

On the run from Meadow Point to Blakely Rock the problem will be keeping your air clear as well as finding a passing lane to get around the slower boats. There may tend to be more breeze on the west side of the Sound.

Blakely Rock will be the place where most of the fleet will compress and finding clear air will be a problem. The challenge will be to stay in clear air and not having to tack too much. The overall goal will be to hold port tack and get across the Sound to Magnolia. There will be some flood at West Point so try to stay out of the current without running aground between Four Mile Rock and the West Point Lighthouse. On this leg expect the breeze to be in the 10-15 knot range from the north.

After West Point don’t tack to port immediately at the Point, instead hold starboard until you can just lay the entrance to the Ship Canal. This will allow you to avoid the flood current that accelerates along the north side of West Point. It will also allow to better judge your approach to the finish line.

The current projections for breeze have this being a fairly speedy race with the TP-52’s around in 1hr 50min, the SC-52 around in 2 hr 05 min, the J-105’s around in 2hr 27 min, the J-35’s around in 2hr 28 min, the Cal 40 around in 2 hr 42 min and the J-30 around in 2 hr and 58 min.

Have a great race, stay safe and have a good time. 

Bruce’s Briefs: Wx for 31 Mar, 1, 2, 3, and 4 April. Sloop Tavern Blakely Rock Benefit Race.

Bruce’s Briefs: Wx for 31 Mar, 1, 2, 3, and 4 April. Sloop Tavern Blakely Rock Benefit Race.

Once again, it’s going to be a very interesting weekend. The doom and gloom forecasts certainly help to drive ratings for the TV weather nogs but the reality may be something quite different because the models are not in agreement about the system we have coming ashore right now. The sat pic, Doppler radar, and surface analysis all show an occluded front headed our way, and the sat pic in particular shows quite an area of cool, unstable air behind the front. Current readings from Destruction Island on the coast show the barometric pressure is rising and the post-frontal wind building into the 30-knot range. It is always interesting to watch what happens as these fronts encounter the land and the Olympic Mountains. Typically they weaken and slow down however, we shall see.

The overall weather picture from the surface analysis chart shows a moderate low-pressure system (984MB) just off of Sitka, with a weak trough of low-pressure just inland from SE Alaska to Oregon. There is also a weak high-pressure system (1010MB) just on the other side of the Cascades and a series of weak highs (1022-1026MB) in the Pacific. The jet stream and upper air chart for today still show a mostly zonal flow with a cut-off upper-level low just north of Hawaii and the jet stream coming ashore in LA. All of these will keep our temps below normal and keep us in a rainy pattern for today and tomorrow.

It’s the surface forecast chart for tomorrow which shows the pressure gradient easing as the front has passed. Some models have the wind over the central Sound easing to the 5-12 knot range while the UW MM5 model shows a post-frontal flow coming through the Chehalis Gap and up the Sound in the 15-18  knot range and then building to 20-25 in the early afternoon before a northerly of 12-16 knots fills down the Sound in the mid-afternoon.  This will keep tacticians and trimmers very busy and help to keep them warm in the cold and the rain.

Tidal Current at West Point won’t be an issue tomorrow.

0700       Slack

1218       Max Fld                 .32 knts

1430       Slack

1542       Max Ebb                .14 knts

1730       Slack

With a consistent southerly for today and tomorrow as well as a fair amount of freshwater being dumped into the Sound by the Duwamish and the Ship Canal may result in a wind-generated surface current flowing to the north and negating the weak flood. Something to watch especially in the neighborhood of the West Point and Meadow Point buoys.  

So how do we sail the race tomorrow? Most likely the usual topographical shifts will still be in play along the east side of the Sound. So getting a clean start and finding a lane of clear air up to West Point will be critical. At West Point, it will be time to head across the Sound and get to the west side to be in a position to take advantage of the puffs that will be lifts on starboard tack as you go up the Bainbridge shore. Watch getting in too close to the Bainbridge shore as it can be lighter in there.

As you approach the Rock you’ll probably set up to do a port pole bear-away set so you can avoid the rocks just north of Blakely Rock. If the wind starts to lighten up, it’s time to gybe and aim for Meadow Point. Near West Point, you’ll want to start trying to figure out how to be the inside boat for the rounding at Meadow Point and discussing what kind of drop you’re going to do so you can have everything clear to tack away from the beach. It gets shallow very quickly in there so be ready and make sure the boats around you know that you’re going to need shore room. 

Once on the beat to the finish, you will need to figure out how to get to the favored end of the finish line. If it’s the boat end of the line get back to the beach so you can tack to port and lay the committee boat end. If it’s the buoy end of the line hold port from Meadow Point until you can tack to starboard to get to the buoy.

Have fun, stay safe, stay warm, and enjoy the race.   

Wet Wednesday – Icebergs and Olympic Classes

Back to a PNW Wet Wednesday, specifically Sloop Tavern’s Iceberg Series. This video comes courtesy of Marc-Andrea Klimaschewski (thanks!) from onboard the J/80 Reckless. Some fun footage of a flying reach to Skiff Point including losing the chute a couple times. Reckless ended up winning Class 4. Send those videos in. Now’s a good time to get your video gear sussed out for the season. You want to save it for posterity, right?

STYC Iceberg Race 2018 on SV Reckless from Marc-Andrea Klimaschewski on Vimeo.

 

And for you dinghy sailors, all those Olympic and up-and-comer types were in Miami for the World Cup Series a week ago. And while all the final races were broadcast live online over the weekend, I’m thinking not many of us spent our days doing that. Here’s a 50 minute recap of the series, with some great heavy air sailing in all the Olympic classes. Check out the boat handling, and check out Caleb Paine coming from behind to grab the silver in the Finn. You can skip around to enjoy the classes you find most interesting.

Bruce’s Weather Brief for Sloop Tavern Blakely Rock Benefit Race – Sunblock Every 2-3 Hours!

If you liked last weekend, you’ll love tomorrow. Once again, the models are diverging as we get closer to race time. Not unusual this time of the year as the weather in the Pacific is trying to transition from winter to summer.

Wind speed vs air pressure at West Point
Wind speed vs air pressure at West Point

The Pacific High is still well south of its summertime residence and storm systems are pushing it around and keeping it from becoming more round, stronger and more stable. See the 1700 Surface Forecast Chart.

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The only real known forecasts with a high degree of accuracy are the tides and currents.

Tides for tomorrow are:

0803      Low        6.35 feet

1258      High       8.7 feet

1939      Low         1.02 feet

Currents at West Point:

0846      Slack

1017      Flood     .16 knots

1220      Slack

1613      Ebb          .71 knots

2004      Slack

 

As you can see from the Surface Forecast Charts there is very little gradient over the Pacific Northwest. When you log the pressure readings at 1200 hours on Friday you find the following:

Forks                        1023.4

Bellingham          1023.1

SEA                            1023.4

PDX                           1022.6

In other words not much. What’s interesting is that there has been a northerly all night and this morning over most of the race area even though the National Weather Service has been forecasting a southerly for the morning then changing over to a northerly in the afternoon with the same for tomorrow, sort of. The culprit here is the Swihart effect which says that in the absence of a pressure gradient over the Pacific NW and the presence of abundant sunshine causing heating of the concrete and blacktop jungle known as the City and surrounding environs of Seattle, combined with a flood tide, will initiate a northerly  in the Sound. So with two days of beautiful, clear skies and temps near 70⁰ you’re getting plenty of heating. This will probably carry over to tomorrow, at least that’s what we’re hoping for. Regardless, you’ll still need to track the pressure gradients and the wind over the area, especially the ferry weather at Edmonds and Elliott Bay.

So if there is a northerly, how do we sail this race? The first item to check when you leave Shilshole and get out to the starting area is what is the flag doing at West Point. If it’s like this morning, you’ll notice a very slight shift to the NNE. When you start with a northerly, the first mark is Meadow Point so having to leave the mark to port always creates some interesting rounding problems especially for the deep draft vessels that would rather come in on port since the starboard tack approach can get you into some skinny water. Since there is a flood you’ll want to set with the pole to starboard and aim towards the mark at Blakely Rock. If you get slightly lifted as you get close to West Point, you might want to gybe to port. If there is a northeasterly at West Point there will be more wind under the bluff and you can hold that until you get lifted above Alki and your heading has you between Alki and Duwamish, then gybe back to starboard and aim at the Rock. Just don’t hit it….

On the way back from Blakely Rock put it on the wind on port tack and you’ll be heading towards the vicinity of Four Mile Rock. Tide may be slack or just starting to ebb so remember just how far out the shallow area goes from Four Mile to West Point. It almost always claims someone and with the ebb you’re going to be there for a while unless you get some help from the photoboat. Go in as close as you dare before tacking on to starboard. The puffs will be lifts and the person on the main and traveler will be working really hard to take advantage of each and every puff.

Once at West Point you’ll want to hold onto starboard tack to take you off the Point and stay in the ebb tide. Tacking too close to West Point will run you into the back eddy that sweeps along the north side of West Point. Tack to port when you stay outside of the restricted zone at the entrance to the Ship Canal. Then plan on one tack at the breakwater to make the finish.

This was the optimistic race forecast. On the other hand if it goes according to the forecast models and we start with a southerly that then clocks to a southwesterly and dies as we transition into a northerly in the later afternoon, it will be a matter of drag racing from puff to puff and sailing the shortest possible course. The big boats with tall rigs and code 0’s could have a real advantage on the reach/run back to Meadow Point. The next problem will be negotiating the rounding because the deep draft boats are going to have to tack immediately at Meadow Point because over the winter the sand bar has moved off the beach and there is now a bump to the north of the usual location of the bar.

Have a great race and don’t get sunburned!