Severe Storm Outlook Narrative (AC) Issued by NWS
000
ACUS11 KWNS 181431
SWOMCD
SPC MCD 181431
MSZ000-ARZ000-LAZ000-TXZ000-181630-
Mesoscale Discussion 0480
NWS Storm Prediction Center Norman OK
0931 AM CDT Thu Apr 18 2024
Areas affected...northern Louisiana into southern Arkansas and
western Mississippi
Concerning...Severe potential...Watch unlikely
Valid 181431Z - 181630Z
Probability of Watch Issuance...20 percent
SUMMARY...Risk for hail -- and eventually locally damaging wind
gusts -- will gradually expand across southern Arkansas and northern
Louisiana this morning, spreading into western Mississippi with
time. Marginal/localized nature of the risk in the short term
should preclude any need for short-term WW issuance.
DISCUSSION...Slightly elevated convection continues to evolve across
the Arkansas/Louisiana border area this morning, within a zone of QG
ascent ahead of a subtle mid-level impulse moving across east Texas
per morning water vapor imagery. A few transiently stronger cores
are noted, aided by moderately strong flow through the middle
troposphere amidst an environment characterized by about 1000 J/kg
most-unstable CAPE.
The primary short-term risk remains marginally severe hail, with a
couple of the more vigorous/long-lived updrafts. However, filtered
insolation through an existing high-cloud deck will yield enough
surface heating to allow storms to become surface-based with time.
As such, risk for a couple of stronger gusts will manifest as well.
With that said, risk should remain local/limited, given lack of a
focused low-level ascent, suggesting that WW issuance remains
unlikely through midday.
..Goss/Mosier.. 04/18/2024
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...MEG...JAN...LZK...SHV...
LAT...LON 32439406 33999225 34549114 34238993 33078995 32639031
32149288 32179394 32439406