2nd “Storm” Over

September 29, 2013

Time to go to bed…just showers and breezy the rest of the night.

Peak gust was only 41 mph at PDX, in the end a weaker storm than the first.  It just went too far north.  But at least there were fewer power outages.

 


Even Shorter 9pm Update

September 29, 2013

Cold front passing through metro area right now evidenced by line of intense rain on radar and pressure jump.

Peak gust at PDX at 8:20pm was 41 mph.  That might be the best we’ll get unless some random gust is higher in the next hour or two.

2nd storm will end up a little weaker that the first most likely

Chief Meteorologist Mark Nelsen


Extremely Short 7pm Update

September 29, 2013

Just checking in on the observations at 7pm wondering where the wind is like most of the rest of you!

It sure hit Salem with a gust to 47 mph, stronger than yesterday’s wind, but pretty quiet here in the metro area right now.  The low pressure system is definitely making landfall a bit farther north than we expected which also means a bit farther away from us too.    The center is pretty obvious on the water vapor satellite imagery:

WV4NW

As a result wind probably won’t be any stronger than what we saw yesterday…gusts stay under 50 mph.  Whatever we get, it’ll be decreasing after 9pm.

Update to the update:  Of course right after I posted this (now it’s 7:16pm), I see Astoria got nailed with a strong wind gust around 60 mph just as the cold front passed overhead!  That’s the strongest of the day…there is still some life left in this thing.  We’ll see what happens in the next 2 hours as the cold front moves inland.  Generally the strongest wind occurs with the pressure jump (cold front) with these systems.

Chief Meteorologist Mark Nelsen


Storm #2 Update: Stronger Than #1!

September 29, 2013

Sunday, 9am…

Get ready for a 2nd round of wind this afternoon; it looks stronger than what we just went through yesterday.

Highlights:

  • Strong wind develops by 4pm at the Coastline and arrives between 4-6pm here in the western valleys.
  • Peak gusts 70-80 mph on the coast
  • Peak gusts 45-55 mph here in the valleys, PDX gusted to 43 yesterday.
  • Wind will gradually die down after 8pm.
  • More rain, but no more than 1.25″ here in the metro area

A nice break the last 12 hours since we are inbetween weather systems.  Now the remnants of Typhoon Pabuk have made it all the way across the Pacific and what’s left will spin up into a powerful low pressure center the next 12 hours.  Morning models are coming out and showing the low “bombing” down to around 970 millibars and landing somewhere between central Vancouver Island and the NW tip of Washington.  Truly historic for September 29th!  Here’s the 12z NAM-MM5 model:

nam

and our 12z RPM:

RPM_12KM_Wind_NWOR_Strong

And the 12z WRF-GFS for 7pm today:

wrf_12z_7pm

compare that with the 00z WRF-GFS for the same time…almost the same.

wrf_00z_7pm

All 3 show a setup for slightly stronger wind than yesterday, assuming they have the strength and position of the developing low correct.  Our RPM even has the center of the low down around 965mb with an extremely tight pressure gradient in the 100 miles around the low;  980 millibars just 50 miles out.  It’s going to be a historic storm up around where it makes landfall.  Lucky for us, the low is far enough away that it’s not in the “big windstorm” position.  That said, once again with leaves on the trees and good mixing due to the warm temps, it shouldn’t be tough to get more damage than yesterday.

I see there are still 10,000 customers out of power in PGE’s territory, there will be more this evening!  Ladies and Gentlemen, get your generators ready…

Nothing of interest going on weatherwise after tonight, just cool showers.

Chief Meteorologist Mark Nelsen