Wandering Low Pressure

The satellite loop below from early Tuesday shows an area of low pressure southwest of California. Interestingly, this has been weather maps near you since early October! It started as an area of low pressure in western Canada and has slowly slid south since then. It also brought flooding rains to parts of New Mexico and Texas last week before wandering into the Pacific Ocean over the weekend. If you can believe it, the forecast calls for this particular low to meander back into the Southwest over the coming days with more rain potential!

10.13.15 Pacific low

Rainfall Past 10 Days

Here’s the radar estimated rainfall over the last 10 days, which encompasses all the moisture associated with this particular low pressure system. Note the several 1″+ rainfall amounts and the heavier amounts in New Mexico and Texas, which led to flooding in those areas.

10.13.15 SW Rain

10.13.15 SC Rain

Tracking the Low Pressure System

Here are a few social media posts from National Weather Service offices over the past few days as the low tracked south out of Canada.

(Image: NWS Tucson, AZ)

10.13.15 low2

(Image: NWS Hanford, CA)

10.13.15 low1

(Image: NWS Phoenix, AZ)

10.13.15 low3

Precipitable Water Loop

Take a look at the precipitable water loop below and note the increase in moisture moving west from Mexico/Baja California over the last few days. This is the moisture associated with the low pressure system, which will start moving back into the Southwest over the next few days.

10.13.15 precipitable water loop

More Rain on the Way in the Southwest

Here’s the 36 hour forecast for the Southwest, which shows chances of showers and storms increasing over the region through early Thursday.

10.13.15 SW forecast

5 Day Rainfall Forecast

According to NOAA’s WPC, the 5 day rainfall forecast suggests a fair amount of moisture moving back into the region through AM Sunday. Note there are some 1″ to 2″+ amounts over parts of California!

10.13.15 SW 5 day

Thanks for checking in and have a great rest of your week! Don’t forget to follow me on Twitter @TNelsonWX