The atmospheric stream

Ryan Henning Leave a comment

The “atmospheric river’ terminology is one that has really captured the imagination of the media, and we are hearing it quite a bit right now as rainfall is inundating southern California. The atmospheric river is simply a strong active jet stream, and when it comes from the sea, there is more moisture available, and “more moisture” isn’t something we think of when talking about southern California. In fact, last month when we were forecasting for San Luis Obispo, I thought the few showers showing up in the area were remarkable enough to call them out ostentatiously. The rain seen now in the LA Basin is several orders of magnitude larger than that, so if this is the atmospheric river, then what we saw in late January was a mere stream. A trickle. For the day, WeatherNation had the forecast victory, being the best temperature forecaster among outlets that left rain in the forecast on the 25th.
Actuals: January 25th, .01 inches of rain, High 66, Low 51
January 26th, High 75, Low 48

Grade: B-C

San Luis Obispo, California to Hattiesburg, Mississippi

Ryan Henning Leave a comment

A business trip this week. Why a business trip? Because it will start on Monday and last through Thursday. Expect it to cover 2074 miles at a pace of a little more than 69mph, which will get us a healthy 553 miles a day for the first three days of our trek. And not to spoil anything, but the weather does look good.

DAY ONE (Monday)

San Luis Obispo, California

High pressure is back out there, everyone. it’s dominating the majority of the country this week, and the southwest US is no exception. The hardest part of the day will be leaving San Luis Obispo (because it’s so lovely) but we will arrive with no concerns at the Crookton Road exit, east of Seligman, Arizona.

DAY TWO (Tuesday)
Nothing is really going to change on Tuesday, except for our location. We will see some rising and falling terrain, but not any real weather change. Heck, we’ll even be on I-40 the whole way. We’ll make it to Tucumcari, New Mexico, before this easy day concludes.

DAY THREE (Wednesday)
Our good luck continues on Wednesday, as we spend much of the day in a calm, quiet Texas. The road will be clear, but be wary of traffic in Dallas, because it will have been a while since we saw any. The jet will start forming a kink south of Texas, and that can portend bad news for the atmosphere, but it won’t yet, not on Wednesday. We stop in Canton, Texas for one last pit stop.

DAY FOUR (Thursday)
The trough will indeed start stirring up some wet weather, but it won’t emerge until after we are on our way into Mississippi. The rain will be over Mexico, low pressure in west Texas, and mostly sunny skies in Hattiesburg.

Hattiesburg, Mississippi

San Luis Obispo, California

Ryan Henning Leave a comment

This has been a busy January. Not only have we had a lot of forecasts, but they have all been during or very close to significant weather. The real test will be if we can keep it up with a forecast in California.

AT 256PM, PT, San Luis Obispo was reporting a temperature of 58 degrees with overcast skies. A weak wave was moving through the Pacific Northwest, and sweeping a mid level cold front as far south as Point Conception. There were scattered showers through out the region, though right now, the heaviest precipitation is diminishing between San Luis Obispo and Bakersfield, with another batch closer to Los Angeles.
The rain is expected to linger in the area, though mostly inland from San Luis Obispo and south towards the LA Basin. The onshore flow behind the boundary will mean that San Luis Obispo will see some overcast through the day Thursday even if they don’t get much more rain. An advancing ridge should bring clearer skies to end the work week.
Tomorrow – Mostly cloudy, with a few breaks late. Early sprinkles, High 64, Low 50
Friday – Sunny with a bit of morning haze, High 72, Low 45

TWC: Tomorrow – Intervals of clouds and sunshine. High 67, Low 53
Friday – Intervals of clouds and sunshine. High 72, Low 47

AW: Tomorrow – Low clouds giving way to sunshine High 70, Low 55
Friday – Partly sunny and pleasant High 74, Low 48

NWS: Tomorrow – Patchy drizzle before 10am. Mostly cloudy, then gradually becoming sunny, High 65, Low 51
Friday – Mostly sunny High 69, Low 49

WB: Tomorrow – Mostly cloudy in the morning, then sunny. Patchy drizzle in the morning, High 67, Low 53
Friday – Partly cloudy, High 71, Low 47

WN: Tomorrow – Partly cloudy with patchy drizzle, High 66, Low 51
Friday – Partly cloudy, High 69, Low 49

CLI: Tomorrow – Sunny, High 69, Low 50
Friday – Mostly cloudy, High 73, Low 48

It IS raining in southern California, but things are improving quickly. Now, here is the ultra rare SOCAL RADAR!

San Luis Obispo, California

Anthony Dunkel Leave a comment

Today we take a trip to the Southwest, where the big story the last few days have been unrelenting Santa Ana winds and massive brush fires kicking up from Sacramento to Los Angeles. Will San Luis Obispo be spared from nature’s fury as we head into the weekend?

At 950pm PDT, the temperature at San Luis Obispo, CA was 46 degrees under fair skies. High pressure continues to settle in from the Northern Rockies into the Central High Plains, keeping pretty much the entire Western US dry as a bone. Luckily, the Santa Ana’s will be weakening tomorrow after an intense event the last 3 days, which caused the Los Angeles NWS office to issue an Extreme Red Flag Warning, something that’s not in their official lexicon but they needed to convey the danger that 60-80mph winds an 1-5% humidity can cause. While a number of fires popped up, SLB avoided the worst of it, save for some air quality issues. Friday is expected to see some breezy conditions in the morning but settle down throughout the afternoon hours. After that, it looks to be a fairly pleasant weekend with generally subdued winds.

Friday: Sunny. High 81, Low 41.
Saturday: Sunny. High 79, Low 40.

TWC: Friday: Sunny. High 80, Low 43.
Saturday: Sunny. High 80, Low 41.

AW: Friday: Sunny and pleasant. High 80, Low 40.
Saturday: Sunny and pleasant. High 80, Low 38.

NWS: Friday: Sunny and breezy. High 80, Low 41.
Saturday: Sunny. High 78, Low 42.

WB: Friday: Sunny. High 79, Low 42.
Saturday: Sunny. High 80, Low 42.

WN: Friday: Sunny. High 80, Low 41.
Saturday: Sunny. High 78, Low 42.

FIO: Friday: Clear throughout the day. High 78, Low 47.
Saturday: Clear throughout the day. High 79, Low 50.

The Desert Southwest is pretty much clear as clear can be. The nearest significant cloud system is in the Northern Plains.