Area Forecast Discussion
Issued by NWS Memphis, TN
FXUS64 KMEG 302008
Area Forecast Discussion
National Weather Service Memphis TN
308 PM CDT Sun Apr 30 2017
Current main convection line has advanced east of the region
leaving gusty south winds and slightly drier air in it`s wake. A
few light rain showers from wrap around moisture were tracking
into the northern counties. Temperatures ranged from the upper 60s
to mid 70s...with plenty of lingering cloud cover.
Next 12 hours...short term models agreeing on scattered
convection from upper level low redeveloping for late this
afternoon and early evening east of the Mississippi River. This
activity will have to struggle with a worked over atmosphere and
lower dewpoints. None-the-less a few more cracks of thunder are
expected with perhaps an additional half inch of rainfall. This
should not pose any additional flash flood issues...as the
current lull in activity is allowing for morning waters to recede.
Clouds will partially clear from west to east tonight with breezy
southwest winds keeping the low levels well mixed.
Monday and Monday night...the aforementioned low will continue to
slowly track northeast into the western Great Lakes this period.
Strong pressure gradient will keep westerly winds in the northern
and western Midsouth counties near advisory strength. Lingering
low level moisture will also provide for broken stratocumulus
cloud cover to extend down to the I-40 corridor...these clouds
should scatter out with the loss of heating by sunset. Winds will
diminish tomorrow night and back to a more southerly component.
Tuesday through Saturday...models continue to make new
adjustments with the evolution of the next midlevel
shortwave/closed low to drop south. The GFS has flopped to a more
aggressive approach with a deeper low center that lingers nearly
overhead longer. The ECMWF has also flopped to a more persistent
open wave that briefly closes off in the Ohio Valley Thursday.
This scenario forecasts a slightly drier period. Have taken a
blend of both models with clouds streaming in late Tuesday and a
threat for a shower or storm Tuesday night. Better rain chances
are anticipated for Wednesday and Thursday...with points east of
the Mississippi River seeing light shower activity extended into
Friday. The low will move east by Saturday with a strong northwest
flow aloft bringing subsidence and stability. Temperatures this
period will start off seasonal...then cooler for Thursday and
Friday...then back to seasonal Saturday.
Back edge of showers and thunderstorms will exit the sites early
in the period with VFR conditions. South to southwest Winds will
be the greatest concern this period with a lull in gust speeds
occurring during the overnight hours. Winds will regain strength
late in the period with lower VFR cigs swinging into JBR and MKL.
AR...Wind Advisory until 7 PM CDT this evening for Clay-Craighead-
MO...Wind Advisory until 7 PM CDT this evening for Dunklin-Pemiscot.
MS...Wind Advisory until 7 PM CDT this evening for Alcorn-Benton MS-
TN...Wind Advisory until 7 PM CDT this evening for Benton TN-Carroll-