Late week storms bring another chance of severe weather

Many of you were able to get out and enjoy a cooler Easter
weekend despite cloudy skies and sprinkles on Sunday, but those waiting for the
next period of warm temperatures and thunderstorms, you’re wish is soon to be
granted! Indeed, spring weather is quickly returning to the Mid-South and this
may include a chance of strong thunderstorms before week’s end as well.


The first ‘phase’ in setting up this week’s weather already
moved through this morning, as scattered showers and a few thunderstorms
developed and moved across the metro around daybreak this morning, in advance
of a warm front lifting north through the region. While these storms were not
severe, some areas did receive a quarter inch or so of rainfall, and perhaps a
few of you got a slightly early wake-up call thanks to thunder! That system has
exited to the northeast, leaving behind mostly cloudy skies and warming


Before getting to the potential strong thunderstorms later
this week, in the interim, the weather pattern over the Mid-South should be
relatively quiet. The main story for Tuesday and Wednesday will be the return
of above-average temperatures, as highs reach the lower 80s. The Mid-South will
be increasingly situated in a “warm sector” atmosphere, which means higher moisture
levels, instability, and breezy south winds to accompany those warm
temperatures. During this period, it appears rain chances should be relatively
low. However, with the amount of moisture and unstable air present, and a few
weak upper-level disturbances moving nearby in the upper-level wind flow, a few
showers or a stray storm can’t be ruled out. The threat for organized storms
should stay north and west of the metro through at least Thursday afternoon.

NAM forecast of temperatures at 4 pm on Wednesday, April 8. Highs in the lower 80s are expected both Tuesday and Wednesday in the metro, with only slight shower and thunderstorm chances.

Thursday – severe weather possible

On Thursday afternoon, things will begin to change, as a
strong low pressure system moves northeast out of the Plains states into the
Upper Midwest, with a cold front trailing the low and approaching the western
border of Arkansas near lunchtime. Thunderstorms should develop and organize
along and ahead of the front within the established unstable airmass and move
toward the Mid-South region by Thursday evening and night. There remains some
uncertainty on the exact timing of when the metro might be affected by the
strongest storms, as models continue to show a bit of disagreement on the speed
of the front.  Nevertheless,
thunderstorms should become likely by some point Thursday night.

Precipitation forecast from the GFS model between 7 pm Thursday and 1 am Friday, indicating likely widespread showers and thunderstorms nearby/in the metro area. Heavy rainfall amounts (1″ or greater) possible. Graphic courtesy WxBell.
GFS model forecast of CAPE, which is a measure of instability, for Thursday evening.
Values of 1000-2000 in the metro support the potential for strong thunderstorms. Graphic courtesy WxBell.

Severe weather risk

With a decent amount of instability in place, aided by
relatively strong winds aloft, thunderstorms that move into the region may be
strong to severe in nature. Currently, the Storm Prediction Center  (SPC) has the
entire metro in a 15% risk area for severe weather (equivalent to a Slight
Risk, category 2 out of 5) on its Day 4 outlook issued earlier this morning. Damaging
wind is likely to be the primary hazard, but hail and some tornado risk cannot
be discounted yet either
. Early indications from the SPC show the highest
tornado risk might be north of the metro, toward Missouri and Illinois, closer
to the primary low pressure center (30% region in graphic below). Thunderstorms
are also likely to contain a large amount of rainfall, so a risk of localized
flash flooding may exist
as well.

Severe weather risk outline valid for Thursday, April 9 via Storm Prediction Center.
The metro area is within the 15%/Slight Risk (Category 2) area.

Friday into the weekend

It appears the front should push through the region with
relative ease by early Friday, which would mean drying conditions and slightly
cooler temperatures into the early part of the weekend. However, that might be
short lived as another active pattern looks to develop by next Sunday, which
may persist into much of next week. We’ll be looking closer into those
possibilities in the days ahead and after Thursday’s event passes!

Of course, you’ll want to stay with MWN via our social media channels listed below in the upcoming days
as we’ll have more updates on severe weather
chances as the event draws closer. Now is also a good time to download the MWN mobile app and add StormWatch+ within the app for instant watches and warnings during severe weather. These push notification-based alerts will only sound for the location(s) that are of interest to you and for the alert types that you select, at the times you want them. MWN is the only LOCAL source of weather information that provides this life-saving service. Links are provided below for more information or to download.

Kevin Terry
MWN Meteorologist Intern

Erik Proseus
MWN Meteorologist

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