Excessive Rainfall Discussion
NWS Weather Prediction Center College Park MD
343 AM EST Sat Feb 14 2026

Day 1
Valid 12Z Sat Feb 14 2026 - 12Z Sun Feb 15 2026

...THERE IS A SLIGHT RISK OF EXCESSIVE RAINFALL FROM THE ARKLATEX
TO THE MID-SOUTH...

A positively tilted upper trough will pivot across the Southern
Plains, while a low pressure system develops at the surface today.
Mid-level diffluence will shed lobes of vorticity over parts of
the Southern/Central Plains and Lower/Middle Mississippi Valley,
providing ample forcing for convection to develop. Thus, showers
and thunderstorms are likely to increase in coverage this afternoon
starting over north-central Texas, into central Oklahoma and
spreading eastward into the Lower Mississippi Valley tonight. The
associated surface wave should strengthen into a rather anomalous
mid-latitude cyclone by tonight, which is when a line of convection
may initiate over east Texas and begin to propagate east across
the central Gulf Coast.

Instability will be most robust (250-750 J/Kg) over east Texas,
southern Arkansas and Louisiana through tonight. 1-2" PWATs will be
2-3 stndv above average and could produce 0.25"-0.75"/hr rates
with higher rates possible within linear convective bands moving
through east Texas and within any potential training/backbuilding
convection that occurs along a surface front draped over Arkansas.
Guidance is hinting at potential for slow moving cells to generate
an isolated flash flood threat over portions of Missouri this
afternoon.

Kebede


Day 2
Valid 12Z Sun Feb 15 2026 - 12Z Mon Feb 16 2026

...THERE IS A MARGINAL RISK OF EXCESSIVE RAINFALL ACROSS PORTIONS
OF THE MID-ATLANTIC AND SOUTHEAST...

The marginal risk area from yesterday's issuance remains mostly
the same, with the only change being an expansion northward in
Virginia. The potent low pressure system that will bring heavy
rainfall to the Lower Mississippi Valley today will continue to
spread moderate to heavy rainfall over parts of the Southeast and
Mid-Atlantic on Sunday. The heaviest rainfall is expected to occur
Sunday afternoon into evening in the Southeast, along the same
cold front responsible for potential linear convection over the
central Gulf Coast today.

MLCAPE will be modest at around 250-500 J/Kg, while PWATs hover
between 1-1.75" over the Southeast. Phasing of this southern stream
system with a northern stream one emerging from the Ohio Valley
could enhance precip. coverage over the Mid-Atlantic this afternoon
into tonight.

Kebede


Day 3
Valid 12Z Mon Feb 16 2026 - 12Z Tue Feb 17 2026

...THERE IS A SLIGHT RISK OF EXCESSIVE RAINFALL ACROSS PORTIONS OF
CENTRAL AND SOUTHERN CALIFORNIA...

A slight risk was introduced, in coordination with local offices,
across parts of the central and southern California Coast. A closed
mid-level low will weaken while shedding lobes of vorticity over
the West Coast on Monday. An upper-level jet streak (100-140 kts)
will gradually increase in intensity throughout the day as it sags
south from central to southern California. A surface wave will
develop and spread rain showers and isolated thunderstorms into the
central to southern coastal ranges below 6500-5000ft Monday
morning and into the early evening.

PWATs in the 0.5"-0.9" range within a relatively buoyant
atmosphere (100-200 J/Kg) and a 30-40 kt low level jet, could
support efficient rain rates especially within any convection that
develops. Burn scars will be especially susceptible to flash
flooding.

Kebede


Day 1 threat area: www.wpc.ncep.noaa.gov/qpf/94epoints.txt
Day 2 threat area: www.wpc.ncep.noaa.gov/qpf/98epoints.txt
Day 3 threat area: www.wpc.ncep.noaa.gov/qpf/99epoints.txt