Our next opportunity for failure begins tomorrow night.
Also, not good for the folks in parts of Kentucky. Disco from WPC excessive rainfall discussion for day 2-
Mid-Mississippi Valley to the Tennessee Valley and
Mid-Atlantic...
There is a growing signal for repeating storms to develop along a
stalled frontal boundary that could potentially yield several
inches of rain across middle Tennessee, far southern Kentucky and
areas back towards the Missouri Bootheel. During this period much
of the southern tier of the country will have pooled Gulf moisture
with PWs upwards of 2 inches (+1- +2 sigma) along with nearly
parallel low level flow (20-25 kts) to the W-E orientated frontal
boundary. This is a favorable setup for very efficient rainfall.
Even with another set of model guidance...the exact location of
the frontal boundary along with when it starts to lift northward
dampens confidence as to whether or not a Moderate Risk will need
to be introduced over areas soaked by recent excessive rainfall
events. Much like yesterday...opted to use a broader brush for
the Slight Risk area than usual for what may well be modest
rainfall amounts across the Tennessee Valley and central
Appalachians. There is still some possibility that some heavy rain
could develop along east of the Appalachians later Sunday night
into early Monday as a shortwave induces low pressure to form
along a front that extends from Virginia out over the Atlantic.
The model agreement is not unanimous but the NCEP guidance has
started to reflect the idea began by the UKMET 24 hours ago. Made
only minor adjustments to the on-going outlook there.