monsoon flow happening the next few days

.

~~~ WATCH ~~~
As this high vacates the PacNW region
today...a low pressure circulation will be forced out of southern
New Mexico and across the 4 Corners into the Great Basin over the
next 24 to 48 hours. The result of this shift will be deep
southerly flow across the Southern to Central Rockies. This flow
is tapping into Gulf and SubTrop moisture which is already being
advected into the 4 Corners early this morning. This shows up
well in the 305-310K surfaces and was hinted at in the GOES ALPW
imagery late early this morning. PWAT at GJT was 0.6 on the 29/00Z
sounding and we look to add around another 1/3 of inch to that
today as mositure continues to advect northward. This moisture
will come in handy as broad forcing for ascent arrives with
shifting low pressure aloft. Ascent will also be enhanced by a
branch of the SubTrop jet moving through the thermal gradient
between the low and the Bermuda High building across W.Texas. Deep
but skinny CAPE profiles bring the threat of moderate to heavy
rainfall rates today as the lift and moisture combine to bring a
noticably uptick in storm coverage this afternoon. Old school K
index values in the upper 30s may be a hint at the heavier
rainfall threat though surface dew points only in the 40s to near
50. Light south to southeast steering winds will also be a
concern for slower moving storms with the most apparent threats to
our newer burn scars. The ingredients all point to the best storm
coverage over our southern mountains through the afternoon where
the best moisture advection and jet aloft is present.
Unsettled weather continues into the longterm as PWATs remain above
average. Climatologically, our average PWAT is right around .6
inches so we`re certainly above that. Plenty of moisture and
unsettled weather means plenty of showers and storms through the
period. Great news for the drought and fire weather, less so for
burn scars or areas that see continued rainfall or training cells.

As far as the big picture is concerned, the desert southwest looks
very disorganized.
models also show an area of high pressure over Texas
and this is the feature that will bring in all the moisture to our
region. This high looks to retrograde through the long term and
eventually set up just to our west over Utah and Arizona. This
happens on Monday so until then, plenty of moisture will be worked
on by daytime heating, orographic lift, or weak little disturbances
that will move through from time to time. Some days will be more
active than others but the general gist of afternoon and evening
showers and storms, some with heavier rain, remains the case. Some
other good news are that daytime highs will be below normal thanks
to the precip and increased cloud cover. Heading into the weekend,
temps will reach more normal values.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s