Tornado Warning 137, NWS Norman, OK

Area Forecast Discussion
National Weather Service Norman OK
228 PM CDT Sat May 25 2024

...New SHORT TERM, LONG TERM...

.SHORT TERM...
(This evening through Sunday)
Issued at 218 PM CDT Sat May 25 2024

A Moderate severe risk will remain through much of our Oklahoma CWA
to an Enhanced risk across our Texas CWA through midnight with the
potential of severe storms rapidly growing to supercells initiating
east of an approaching dryline and Pacific-based cold front.
Increasing moisture will continue to destabilize the warm sector
which includes our entire CWA while strong mixing off the surface
may erode a weak cap as a low-level jet will be strengthening
overnight.  Steepening mid-level lapse rates will result in strong
to extreme Mixed Layer CAPE values.  The strong instability along
with strong shear could start convective initiation later this
afternoon into the evening hours with supercells producing very
large hail while DCAPE values in excess of 1500 J/kg could produce
over 80 mph downburst winds as well as a risk for tornados. Should
it develop, it would be fairly fast moving across our CWA and
exiting after midnight as the surface boundaries (dryline/cold
front) start pushing in from the west. Expecting Sunday to be dry.

&&

.LONG TERM...
(Sunday night through next Friday)
Issued at 218 PM CDT Sat May 25 2024

We are still expected to stay dry next week Monday but the forecast
becomes "wetter" from Tuesday on with increasing storm probabilities
through the latter half of next week.  Although sunny and
unseasonably warmer (upper 80s to lower 90s) but less humid on
Monday, increasing afternoon cloud cover will be cooling
temperatures to more seasonably average as next week progresses.
However, could still feel muggy if the moister ECMWF solution is
correct.

Models in agreement with an upper ridge building over the western
U.S. returning the Southern Plains to a northwest flow pattern
expelling a series of shortwaves resulting in MCS activity coming
down from the Central & Southern High Plains.  As a result, will
maintain POPs for elevated storms from this complex every
evening/night starting Tuesday.  Down in the lower levels, models
also in agreement with increasing moisture transport reforming a
dryline lee of the Colorado/New Mexico Rockies with each daytime
punch only making it to the New Mexico/Texas state lines.  Models do
differ with the strength of the moisture return and instability into
our area with the ECMWF more aggressive and unstable advecting upper
60s dew points by Wednesday along with a warm front lifting into our
area on Friday.  Meanwhile, moisture advection is slightly weaker
(lower 60s dew points) with a less defined warm front passage with
the GFS solution. Without the potential of a surface boundary until
the end of the week, both models in agreement with moisture ascent
seen in the isentropic fields from the lower through mid-levels for
warm advection rain showers although may stay capped for any surface
based convection.  Thursday night/Fridays convection could be more
widespread with a stronger vort-max coming through over a lifting
warm front.  As far as severe, the overall "moister" ECMWF would
suggest a few strong storms with up to 1500 J/kg of MUCAPE although
shear would be very weak for any severe organization. Long range
models deviate at the end of this week with the handling of a large
amplitude trough digging through this weekend as per the ECMWF with
more of a short wave with the GFS solution.

&&

.AVIATION...
(18Z TAFS)
Issued at 1225 PM CDT Sat May 25 2024

Mainly VFR conditions this afternoon outside of near the Red river
where some lingering MVFR ceilings will linger into the afternoon
hours. Otherwise gusty south/southeast winds will also develop
during the afternoon hours. Some convection is expected to develop
across the west and move east across the area this evening. LLWS
will also occur overnight as the LLJ strengthens to near 50kts.
Some MVFR ceilings may redevelop late tonight into Sunday morning,
but should be short-lived as surface winds veer ahead of a cold
front.

&&

.PRELIMINARY POINT TEMPS/POPS...
Oklahoma City OK  70  91  61  87 /  40   0   0   0
Hobart OK         64  94  60  92 /  20   0   0   0
Wichita Falls TX  72  97  63  92 /  30   0   0   0
Gage OK           60  89  54  91 /  10   0   0   0
Ponca City OK     68  88  58  86 /  60   0   0   0
Durant OK         72  94  65  89 /  40   0   0   0

&&

.OUN WATCHES/WARNINGS/ADVISORIES...
OK...None.
TX...None.
&&

SHORT TERM...68
LONG TERM....68
AVIATION...30

Hazardous Weather Outlook
National Weather Service Norman OK
252 PM CDT Sat May 25 2024

OKZ004>048-050>052-TXZ083>090-262000-
Harper-Woods-Alfalfa-Grant-Kay-Ellis-Woodward-Major-Garfield-
Noble-Roger Mills-Dewey-Custer-Blaine-Kingfisher-Logan-Payne-
Beckham-Washita-Caddo-Canadian-Oklahoma-Lincoln-Grady-McClain-
Cleveland-Pottawatomie-Seminole-Hughes-Harmon-Greer-Kiowa-Jackson-
Tillman-Comanche-Stephens-Garvin-Murray-Pontotoc-Coal-Cotton-
Jefferson-Carter-Johnston-Atoka-Love-Marshall-Bryan-Hardeman-
Foard-Wilbarger-Wichita-Knox-Baylor-Archer-Clay-
252 PM CDT Sat May 25 2024

This hazardous weather outlook is for portions of northern...
western...central...and southern Oklahoma...and western north
Texas.

.DAY ONE...This Afternoon and Tonight...

.Thunderstorms...
Severe thunderstorms will be possible this afternoon through the
evening hours with supercells that could produce up to softball
size hail and up to 80 mph or higher downburst wind gusts. Long
track tornadoes will also be possible anywhere in the risk area.
All of our area is within a risk for severe storms with the
highest risk area across northern through central and southwest
Oklahoma.

.SPOTTER AND EMERGENCY MANAGEMENT STATEMENT...

Storm spotter groups and emergency management personnel across our
entire area should prepare for severe weather operations through
this evening.

.DAYS TWO THROUGH SEVEN...Sunday through Friday...

.Thunderstorms...
Thunderstorms chances will return on Tuesday and every day and
night through Friday. A few of these storms could become strong to
low-end severe.

Get graphics and more details at weather.gov/norman...and follow
our weather forecast office on Twitter and Facebook.

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