Lightnews — Scholar-powered news

Anthony Edwards @edwardsanthonyb.bsky.social · 1d

While impactful weather is likely from this pattern early next week, Northern Californians should expect significant changes to the forecast through the next seven days. Shifts could turn warmer/drier or potentially colder/wetter, depending on where the dip in the storm track goes.

9

Anthony Edwards @edwardsanthonyb.bsky.social · 1d

You're welcome! That's very kind of you to say :)

1

Anthony Edwards @edwardsanthonyb.bsky.social · 1d

Labor Day 2020 wildfires in the Pacific Northwest were an example of the extreme weather that can occur downstream from a series of recurving typhoons

Three Western Pacific Typhoons Strengthened Fire Weather in the Recent Northwest U.S. Conflagration

agupubs.onlinelibrary.wiley.com/doi/full/10....

2 1 13

Anthony Edwards @edwardsanthonyb.bsky.social · 1d

Model predictability takes a hit from recurving typhoons so expect some swings in forecasts the next few days
fractal.wordpress.ncsu.edu/category/rec...

recurving typhoons | Tropical Dynamics

fractal.wordpress.ncsu.edu

1 2

Anthony Edwards @edwardsanthonyb.bsky.social · 1d

An early season cold air outbreak (not Arctic, but relatively cold) is possible throughout the West Next week as the jet stream winds become meridional (north to south)

1 5

Anthony Edwards @edwardsanthonyb.bsky.social · 1d

Energy from Typhoon Halong near Japan may amplify the jet steam (excite the storm track) across the Northern Pacific / western North America this weekend. Scientifically known as tropical cyclone recurvature & extratropical transition.
Maps: @aliciambentley.bsky.social

1 5 44

Anthony Edwards @edwardsanthonyb.bsky.social · 1d

I'm interested in this!

1 4

Reposted by Anthony Edwards

Simon Lee @simonleewx.com · 2d

The west–east temperature contrast across North America is a hallmark of the Pacific Ridge regime, which is currently at 1.5–2 standard deviations simonleewx.com/ecmwf_north_...

Weather Regime Index plots from the ECMWF IFS subseasonal ensemble

1 14

Anthony Edwards @edwardsanthonyb.bsky.social · 1d

Kuroshio Extension region... 🤔

2

Reposted by Anthony Edwards

San Francisco Chronicle @sfchronicle.com · 2d

Offshore winds will push city temperatures into the 80s Monday and Tuesday before a potential tropical moisture link adds uncertainty to the weekend forecast.

San Francisco heats up to start the week before the forecast grows murky

Offshore winds will push city temperatures into the 80s Monday and Tuesday before a potential tropical moisture link adds uncertainty to the weekend forecast.

bit.ly

1 7

Anthony Edwards @edwardsanthonyb.bsky.social · 1d

Frustrated with weather forecasts in S.F.? Here’s why temperatures are so hard to predict www.sfchronicle.com/weather/arti...

Frustrated with weather forecasts in S.F.? Here’s why temperatures are so hard to predict

Meteorologists can be taken by surprise in San Francisco. Here are some of the reasons forecasts are fickle in the city.

www.sfchronicle.com

1 3 7

Anthony Edwards @edwardsanthonyb.bsky.social · 4d

Potential tropical cyclone remnants and broad area of low pressure in the middle latitudes supports a tilt in the odds toward wet weather across the West next week, particularly the Desert Southwest and Southern California. #CAwx #AZwx

8 36

Reposted by Anthony Edwards

UC Berkeley Central Sierra Snow Lab @cssl.bsky.social · 5d

10/2/25 10:25am

No snow yet but plenty of rain over the last 24 hours, which is a great start to the 2026 water year that began yesterday.

These early rain storms help prime our soil and keep it moist meaning less water from our snow has to do that job later.

#CAwx #CAwater

3 7 26

Reposted by Anthony Edwards

Robert Krier @eyesonsdskies.bsky.social · 5d

Good soaking today in the Bay Area. It's always nice to see early October rain anywhere in California to give at least a temporary reprieve from the usual fall fire danger. #CAwx

7 24

Anthony Edwards @edwardsanthonyb.bsky.social · 5d

Luckily, this ended up being a pretty low-impact event. However, it can be a terrible headache when this occurs with stronger storms. These small "waves" can slow or stall the progression of an atmospheric river (such as Dec. 31, 2022), and cause major flooding without much warning.

5

Anthony Edwards @edwardsanthonyb.bsky.social · 5d

Nightmare fuel forecast

1

Anthony Edwards @edwardsanthonyb.bsky.social · 5d

Moisture was plentiful across the Bay Area the past few days, but what lacked until this AM was upward motion to convert water vapor to rain. That finally arrived as a wave developed along the front. Ahead of it, winds diverged in the upper atmosphere and converged near the ground=vertical lift&rain

4 1 17

Anthony Edwards @edwardsanthonyb.bsky.social · 6d

Spare the Air alerts could double in Bay Area under new rule www.sfchronicle.com/bayarea/arti...

Spare the Air alerts could double in Bay Area under new rule

The Bay Area Air District voted Tuesday to lower the threshold for bad air quality days, which could sharply increase the number of alerts.

www.sfchronicle.com

1 1 11

Anthony Edwards @edwardsanthonyb.bsky.social · 6d

The federal government shut down on Wednesday for the first time since 2019, triggering a full stop for most research activities inside science agencies. Good overview from @aip.bsky.social
www.aip.org/fyi/federal-...

Federal Science on Pause Amid Shutdown

Most science agency staff will be furloughed, but federally funded extramural research can continue.

www.aip.org

1 13 29

Reposted by Anthony Edwards

cira-csu.bsky.social @cira-csu.bsky.social · 6d

Volcanic emissions from Kīlauea's 34th eruptive episode were lofted into the sky above the island of Hawai'i.

8 29

Anthony Edwards @edwardsanthonyb.bsky.social · 6d

@paulkpix.bsky.social looks like traffic pattern has flipped, with only one meteorologist at the Oakland CWSU this might be more of a problem heading into offshore wind season as the replacement meteorologists are not working in-person at the Fremont FAA office