Alert archive / Arkansas / Special Weather Statements in 2021

Special Weather Statement, NWS Memphis, TN

April 29, 20214 counties in Arkansas

NWS Memphis, TN issued this special weather statement at Apr 29, 2021, 3:10 AM CDT for 4 counties in Arkansas. It was in force for 65 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Apr 29, 2021, 3:10 AM CDT (08:10 UTC)
Expired: Apr 29, 2021, 4:15 AM CDT
In force: 65 min
Issued by: NWS Memphis, TN

Counties Clay County, AR, Craighead County, AR, Greene County, AR, Poinsett County, AR

The radar

The Memphis radar (KNQA), 115 km from the middle of the area, began a volume at 08:11 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Little Rock, AR (KLZK), launched 00:00Z, 8.2 hours before the alert went out and 158 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 703 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 907 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 241 m²/s²
0-3 km storm-relative helicity: 341 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 12.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Memphis, TN wrote its last area forecast discussion before this special weather statement went out at Apr 29, 3:00 AM CDT, 10 minutes earlier.

Area forecast discussion, Apr 29, 3:00 AM CDT, 10 minutes before

Area Forecast Discussion
National Weather Service Memphis TN
300 AM CDT Thu Apr 29 2021

.DISCUSSION...

Skies are mostly cloudy across the Mid-South early this morning
with temperatures ranging from the upper 60s to the mid 70s.
Showers and thunderstorms are currently moving across portions of
northeast Arkansas and the Missouri bootheel. Currently, a cold
front was moving across western Arkansas and into northeast Texas.

The cold front will continue to move slowly east across Arkansas
today. More showers and thunderstorms will develop ahead of the
front and move through the region. Some of the thunderstorms could
become severe with damaging winds, large hail and isolated tornadoes
possible. Locally heavy rainfall is also possible. Temperatures
will be a little cooler than yesterday with highs in the mid 70s
to mid 80s. The cold front will move quickly through the region
tonight with thunderstorms moving out of the Mid-South this
evening. Temperatures will be cooler tonight behind the front with
lows Friday morning in the mid 50s to lower 60s.

High pressure will build into the region by Friday bringing a
period of dry weather for Friday and Saturday. Temperatures will
be near normal on Friday and a few degrees warmer on Saturday.

By Sunday, an upper level low will move out of west Texas and
weaken into a trough. This will provide enough lift to produce
showers and thunderstorms across the Mid-South as early as late
Saturday night and continuing through Sunday. As the upper level
trough moves across the region Sunday night, more showers and
thunderstorms will move through the Mid-South.

A new cold front will approach the Mid-South from the north on
Monday then move through the region on Tuesday before moving into
central Mississippi on Wednesday. As a result, showers and
thunderstorms will be possible for all three days. Temperatures
will remain above normal during this period.

ARS

&&

.AVIATION...

06Z TAF Set

VFR conditions will prevail until around 9-13Z when a line of
convection is expected to start moving into KJBR. Stratus will
spread across the CWA ahead of this line affecting all TAF sites.
The convection will gradually weaken as it moves toward the
KMEM-KMKL corridor. By the time the line sinks as far south as
KTUP, expect it to be just SHRAS. Some brief improvement to the
CIGS may occur before another narrow line of convection located
just along the cold front moves through the area. CIGS may
deteriorate with the line but for now left just mention of VCTS in
for now until there is more confidence with timing of the second
line in order to add reduced VSBYS. SW winds will increase
overnight and will stay gusty until the cold front moves through.
Winds will turn around to the northwest and eventually
north-northeast behind the front with speeds gradually
diminishing. Left mention of low level wind shear at KJBR, KMEM,
and KMKL during the overnight hours.

KRM

&&

.MEG WATCHES/WARNINGS/ADVISORIES...
AR...None.
MO...None.
MS...None.
TN...None.
&&

Hazardous weather outlook, Apr 28, 10:32 PM CDT, 4 hours 38 minutes before

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In the hours before

Local storm report, Apr 28, 10:44 PM CDT, 4 hours 26 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MEMPHIS TN
1044 PM CDT WED APR 28 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0705 PM     TORNADO          4 SSE BUCHANAN          36.38N  88.18W
04/28/2021                   HENRY              TN   BROADCAST MEDIA

            VIDEO EVIDENCE OF A TORNADO NEAR HIGHWAY 79 AND SULPHUR
            WELLS ACADEMY ROAD.

&&

MJ

Special weather statement, Apr 29, 3:10 AM CDT, 0 minutes before

Special Weather Statement
National Weather Service Memphis TN
310 AM CDT Thu Apr 29 2021

ARZ009-018-026-027-MOZ113-290915-
Poinsett AR-Greene AR-Craighead AR-Clay AR-Dunklin MO-
310 AM CDT Thu Apr 29 2021

...A SIGNIFICANT WEATHER ADVISORY HAS BEEN ISSUED UNTIL 415 AM CDT
FOR...

Western Poinsett County in eastern Arkansas...
Greene County in eastern Arkansas...
Craighead County in eastern Arkansas...
Clay County in eastern Arkansas...
Western Dunklin County in southeastern Missouri...

At 309 AM CDT...strong thunderstorms producing penny to nickel size
hail and winds 35 to 45 mph was located along a line extending from
near O'Kean to near Egypt to near Oil Trough. Movement was east at 45
mph.

Heavy rain is also possible with these thunderstorms.

People in western Poinsett...Greene...Craighead...Clay and western
Dunklin Counties should monitor this storm closely.

LAT...LON 3588 9103 3588 9087 3604 9084 3615 9075
      3615 9081 3630 9079 3628 9075 3641 9075
      3643 9078 3650 9078 3650 9017 3605 9023
      3550 9062 3550 9104
TIME...MOT...LOC 0809Z 250DEG 40KT 3622 9086 3589 9100 3558 9141

MJH

The office that day

Everything else NWS Memphis, TN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 29, 4:40 AM CDT	Special Weather Statement	MEG	Dyer, Lake, Obion	65 min
Apr 29, 4:57 AM CDT	Special Weather Statement	MEG	Lauderdale, Tipton	48 min
Apr 29, 5:32 AM CDT	Special Weather Statement	MEG	Benton, Carroll, Crockett, Gibson, Henry, Weakley	28 min
Apr 29, 3:54 AM CDT	Special Weather Statement	MEG	Mississippi	51 min
Apr 29, 4:20 AM CDT	Special Weather Statement	MEG	Poinsett	55 min

Nearby

Special Weather Statements in Arkansas, 2021 Every special weather statement in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.