Alert archive / Mississippi / Special Weather Statements in 2018

Special Weather Statement, NWS Jackson, MS

July 21, 2018Holmes County, Mississippi

NWS Jackson, MS issued this special weather statement at Jul 21, 2018, 12:39 AM CDT for Holmes County, Mississippi. It was in force for 36 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
Jul 21, 2018, 12:39 AM CDT (05:39 UTC)
Expired
Jul 21, 2018, 1:15 AM CDT
In force
36 min
Issued by
NWS Jackson, MS

County Holmes County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 77 km from the middle of the area, began a volume at 05:38 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

Jackson, MS (KJAN), launched 00:00Z, 5.7 hours before the alert went out and 71 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-pSkew-T log-p diagram, Jackson, MS at 00:00Z on 2018-07-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3662 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Jackson, MS at 00:00Z on 2018-07-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 15 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
3662 J/kg
Mixed-layer CIN
-42 J/kg
Mixed-layer LCL
1259 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
15 m²/s²
0-3 km storm-relative helicity
119 m²/s²
Significant tornado parameter
0.4
Supercell composite
4.0

Open this sounding in Storm Lab

The text

As transmitted.

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

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 Jackson, MS wrote its last area forecast discussion before this special weather statement went out at Jul 20, 11:56 PM CDT, 43 minutes earlier.

Area forecast discussion, Jul 20, 11:56 PM CDT, 43 minutes before
Area Forecast Discussion...UPDATED
National Weather Service Jackson MS
1156 PM CDT Fri Jul 20 2018

...DANGEROUS HEAT STRESS CONTINUES WITH SEVERE STORMS POSSIBLE...

.UPDATE...
Updated for 06Z aviation discussion

&&

.AVIATION...
06Z TAF discussion:
Expecting storms to continue from the northwest overnight and
spread southeast. Right now, GLH GWO, GTR may see the bigger
impacts. Added tempo groups for worsening conditions. Some of the
storms may be strong to severe so added gusty winds at those
sites also. The rest of the sites may experience a few hours of
MVFR conditions for reduced visibility and briefly lowered
ceilings. Most of the area should have prevailing VFR conditions
by late afternoon Saturday./17/

&&

.DISCUSSION...
This has been a difficult week of unpredictable weather. Northwest
flow aloft has provided enough flow to force several rounds of
isolated severe storms through the CWA, just as it's about to do
tonight. None of the CAMs really have a handle on the situation.
The storms in Arkansas formed in the high theta e bullseye and are
now ascending and moving through the high CAPE environment. There
is plenty of instability in the atmosphere with 5200 J/kg from
the 00Z JAN sounding and about 35 kts of 0-6km shear. Already
there are reports of large hail coming out of the storms in
Arkansas. These storms will propagate into the CWA over the next
hour or two and move further into central MS. Again the greatest
threats remain as large hail and damaging wind gusts, but can't
rule out a tornado. May need to watch out for heavy rainfall as
well as storms may train to the southeast. /10/

Prior discussion below:

Through tomorrow:

Short segment of showers and thunderstorms coming in from the
northwest this morning managed to strengthen and produce some wind
damage across north-central MS going through the afternoon as it
moved into an environment of 4000 to 5000 j/kg of CAPE and more
than negligible wind shear. Severe thunderstorm watch # 291 was
issued to cover threat of this cell (and potential of other cells
instigated by tstorm outflow) going into SE MS through 7 pm. The
cell prompting the warning has weakened significantly in the past
hour but other cells are still trying to form along the outflow in
a volatile environment and some of the watch will be kept going
for now, at least until main triggering outflow moves to the
southeast or totally washes out.

Important to note that current Severe Thunderstorm Watch #291 does
not cover larger threat from severe storms that looks to develop
this evening into overnight hours. In the continued active
northwest flow pattern aloft there is a complex of storms just now
trying to take shape in southern MO. Similar to last night, a
growing complex should forward-propagate southeast into an air
mass over the Lower MS Valley containing 3000+ j/kg of CAPE well
into the evening hours. Convection last night produced wind damage
across portions of the Arklamiss Delta, but tonight the axis that
storm clusters should ride down is shifted a little east and there
is also potential for storms to hold onto their vigor longer into
the night, owing to more instability and a bit more wind shear to
aid in organization. The highest risk for damaging wind gusts
(possibly up to 70 mph in isolated spots) is across roughly the
Golden Triangle although there is still enough potential for
impact well into the heart of the region to support SPC expanding
their SLIGHT risk of severe weather with this afternoon's update.
There are some signals from HREF data to suggest training
convection could set up into northern zones late tonight into
tomorrow morning as low level flow vectors briefly veer to a
orientation more favorable for back-building. This will be an
aspect of the situation to watch closely as we go into this
evening, but for now we will refrain from hitting hard in the
HWO/graphics because of inherent uncertainties of finer scale
mesoscale evolution in this sort of setup.

We anticipate most of the convection should be ending and/or
shifting to our east very late tonight through midday Saturday
morning. There remains at least slight potential in central and
eastern zones that isolated potent storms could pop up in the
afternoon in the midst of convergent low level flow in the wake of
the main overnight convection. Considering the air mass will
remain very unstable and somewhat sheared on Saturday we will have
to monitor this potential later on Saturday closely. However, for
now, general model consensus suggests enough drying and capping aloft
coming in from the west Saturday afternoon to put a lid on most of
the worrisome convection. Otherwise, temperatures will still be
mainly in a range from the mid to upper 90s with a few readings
topping out at the century mark possible in far western zones.
Despite the continuing hot temperatures we do not anticipate
needing another excessive heat warning for tomorrow in any spots,
mainly because moisture looks to have a bit more ability to mix
out some into tomorrow afternoon. /BB/

Saturday night through middle of next week (Thursday):

Primary concerns looks to be dangerous heat lingering through late
weekend (Sunday), with somewhat brief drier conditions, less muggy &
less rain & storm chances by early week before gradual increase in
rain & storm chances through the extended period into next week.

Overall expect hot & dangerously humid conditions to be the main
concern. As a deep mid-level subtropical ridge slowly retrogrades
westward into the southern Plains & Rockies, a deep trough & cold
front will dig down through the Appalachians will dig down through
into the ArkLaMiss region by Saturday night & into Sunday morning.
This will slowly help thermal profiles cool (i.e. 925mb around 23-28
degrees C), which will help temperatures to only slowly cool down,
ever so slightly in the low-mid 90s while areas south of the front &
west of the Mississippi River should still be able to peak in the
upper 90s & possibly near 100 degrees in our far western Louisiana
parishes. Due to some slightly drier air in the inch to inch & a
quarter range & 850mb Theta E around 320K & isentropic subsidence,
expect drier conditions with lower surface dewpoints falling into
the upper 60s & better mixing. Thus, the heat issues should remain
confined south of I-20 & especially in the Highway 84 corridor to
over in the far southern Louisiana parishes. In these area south of
I-20 we could flirt with heat indices near the 105-110+ degree
range, with areas in the south more likely. Due to that, going to
keep an "Elevated" in the Highway 84 corridor & "Limited" south of I-
20 in the HWO. Will mainly keep this bridged with the previous
graphic & just mention in the HWO for now.

As the trough & cold front dig south, expect the upper trough to
gradually somewhat cut off over the northern Gulf & southeastern
states by early next week. This will lead to continued cooler
thermal profiles & some drier air advecting into the area, at least
by early week. Due to this, expect highs slowly cool down closer to
normals but still above normal in the low-mid 90s. In addition, lows
could fall into the upper 60s in the north-northeast, especially
into the Highway 82 corridor & Golden Triangle by Sunday & Monday
nights. Expect moisture advection to only slowly increase from east-
west through the week as the upper low slowly builds westward.
However, due to north-northeasterly low-level flow, moisture
advection will be slow to increase. Due to this, expect a dry & rain
free day on Monday before scattered rain & storm chances move back
in by early-mid portions of next week. Due to increasing rain
chances, cooler thermal profiles & some scattered cloud cover,
expect highs closer to normal & heat stress issues held in check.
Due to meager lapse rates & flow, not expecting much in the way of
stronger, more organized development. However, as PWs climb to above
2 inches & flow is light at times, some slow storm movement &
locally heavy downpours are possible. /DC/

&&

.PRELIMINARY POINT TEMPS/POPS...
Jackson       77  97  76  95 /  15  14  10   2
Meridian      76  96  75  95 /  29  30  21   5
Vicksburg     77  97  76  96 /   5  12   5   1
Hattiesburg   78  97  76  97 /   5  18   7   6
Natchez       76  98  77  97 /   0   9   2   2
Greenville    77  95  74  95 /  27  18   6   1
Greenwood     77  94  72  92 /  57  32  10   0

&&

.JAN WATCHES/WARNINGS/ADVISORIES...
MS...None.
LA...None.
AR...None.

&&

17
Hazardous weather outlook, Jul 20, 5:03 PM CDT, 7 hours 36 minutes before
Hazardous Weather Outlook
National Weather Service Jackson MS
503 PM CDT Fri Jul 20 2018

ARZ074-075-LAZ008-009-016-MSZ040-212215-
Ashley-Chicot-West Carroll-East Carroll-Madison LA-Issaquena-
503 PM CDT Fri Jul 20 2018

This hazardous weather outlook is for portions of southeast
Arkansas, northeast Louisiana, and west central Mississippi.

.DAY ONE...Tonight and Saturday

SEVERE THUNDERSTORMS
THREAT...Marginal
TIMING...Tonight

EXCESSIVE HEAT
THREAT...Elevated
TIMING...Saturday

Isolated strong to severe storms will be possible late tonight as
a disturbance passes through the region. Wind gusts to 60 mph and
large hail will be possible. Heavy downpours may also lead to
localized flooding. Frequent dangerous lightning can also be
expected. Strong to severe storms may linger through Saturday
morning.

By Saturday afternoon highs will be in the upper 90s
and heat indices will range from 105 to 110. Precautions should
be taken to avoid heat stress. Stay hydrated and wear light, loose
fitted clothing.

(https://www.weather.gov/images/jan/graphicast/1.png)
(https://www.weather.gov/images/jan/graphicast/3.png)

.DAYS TWO THROUGH SEVEN...Saturday night through Thursday

High temperatures from the mid to upper 90s will combine with
high humidity levels to produce heat indices near 105 Sunday.
Precautions should be taken to avoid strenuous outdoor activities.
Check on those vulnerable to heat stress. Stay hydrated and wear
light, loose fitted clothing.

(https://www.weather.gov/images/jan/graphicast/3.png)

.SPOTTER CALL TO ACTION STATEMENT...
The activation of storm spotters, HAM radio operators, and
emergency management personnel in support of severe weather
operations may be needed for portions of the region tonight.

MSZ018-019-034-212215-
Bolivar-Sunflower-Washington-
503 PM CDT Fri Jul 20 2018

This hazardous weather outlook is for portions of northwest
Mississippi.

.DAY ONE...Tonight and Saturday

SEVERE THUNDERSTORMS
THREAT...Slight
TIMING...Tonight

EXCESSIVE HEAT
THREAT...Elevated
TIMING...Saturday

Severe storms will be possible late tonight as a disturbance
passes through the region. Wind gusts to 70 mph and quarter sized
hail will be possible. Heavy downpours may also lead to localized
flooding. Frequent dangerous lightning can also be expected.
Strong to severe storms may linger through Saturday morning.

By Saturday afternoon highs will be in the upper 90s and heat
indices will range from 105 to 110. Precautions should be taken to
avoid heat stress. Stay hydrated and wear light, loose fitted
clothing.

(https://www.weather.gov/images/jan/graphicast/1.png)
(https://www.weather.gov/images/jan/graphicast/3.png)

.DAYS TWO THROUGH SEVEN...Saturday night through Thursday

The probability for widespread hazardous weather is low.

.SPOTTER CALL TO ACTION STATEMENT...
The activation of storm spotters, HAM radio operators, and
emergency management personnel in support of severe weather
operations may be needed for portions of the region tonight.

MSZ025>029-031>033-037>039-044>046-051-052-057-058-212215-
Leflore-Grenada-Carroll-Montgomery-Webster-Lowndes-Choctaw-
Oktibbeha-Attala-Winston-Noxubee-Leake-Neshoba-Kemper-Newton-
Lauderdale-Jasper-Clarke-
503 PM CDT Fri Jul 20 2018

This hazardous weather outlook is for portions of central
Mississippi, east central Mississippi, north central Mississippi,
and northeast Mississippi.

.DAY ONE...Tonight and Saturday

SEVERE THUNDERSTORMS
THREAT...Slight
TIMING...Mainly Tonight

EXCESSIVE HEAT
THREAT...Limited
TIMING...Saturday

Severe storms will be possible late tonight as a disturbance
passes through the region. Wind gusts to 70 mph and quarter sized
hail will be possible. Heavy downpours may also lead to localized
flooding. Frequent dangerous lightning can also be expected.
Strong to severe storms may linger through Saturday morning.

By Saturday afternoon highs will be in the upper 90s and heat
indices will range from 105 to 110. Precautions should be taken to
avoid heat stress. Stay hydrated and wear light, loose fitted
clothing.

(https://www.weather.gov/images/jan/graphicast/1.png)
(https://www.weather.gov/images/jan/graphicast/3.png)

.DAYS TWO THROUGH SEVEN...Saturday night through Thursday

The probability of widespread hazardous weather is low.

.SPOTTER CALL TO ACTION STATEMENT...
The activation of storm spotters, HAM radio operators, and
emergency management personnel in support of severe weather
operations may be needed for portions of the region tonight
through Saturday.

MSZ030-212215-
Clay-
503 PM CDT Fri Jul 20 2018

This hazardous weather outlook is for portions of northeast
Mississippi.

.DAY ONE...Tonight and Saturday

SEVERE THUNDERSTORMS
THREAT...Enhanced
TIMING...Mainly Tonight

EXCESSIVE HEAT
THREAT...Limited
TIMING...Saturday

Severe storms will be likely late tonight as a disturbance passes
through the region. Wind gusts in excess of 70 mph and golf ball
sized hail will be possible. Tornadoes can not be ruled out.
Heavy downpours may also lead to localized flooding. Frequent
dangerous lightning can also be expected. Severe storms may linger
through Saturday morning.

By Saturday afternoon highs will be in the upper 90s and heat
indices will be near 105. Precautions should be taken to avoid
heat stress. Stay hydrated and wear light, loose fitted clothing.

(https://www.weather.gov/images/jan/graphicast/1.png)
(https://www.weather.gov/images/jan/graphicast/3.png)

.DAYS TWO THROUGH SEVEN...Saturday night through Thursday

The probability for widespread hazardous weather is low.

.SPOTTER CALL TO ACTION STATEMENT...
The activation of storm spotters, HAM radio operators, and
emergency management personnel in support of severe weather
operations may be needed for portions of the region tonight
through Saturday.

LAZ007-015-023>026-MSZ060-212215-
Morehouse-Richland-Franklin LA-Catahoula-Tensas-Concordia-Adams-
503 PM CDT Fri Jul 20 2018

This hazardous weather outlook is for portions of northeast
Louisiana, and southwest Mississippi.

.DAY ONE...Tonight and Saturday

EXCESSIVE HEAT
THREAT...Elevated
TIMING...Saturday

Highs in the upper 90s combined with high humidity will lead to
heat indices from 105 to 110. Precautions should be taken to
avoid heat stress. Stay hydrated and wear light, loose fitted
clothing.

(https://www.weather.gov/images/jan/graphicast/1.png)
(https://www.weather.gov/images/jan/graphicast/3.png)

.DAYS TWO THROUGH SEVEN...Saturday night through Thursday

High temperatures from the mid to upper 90s will combine with
high humidity levels to produce heat indices from 105 to 110
Sunday. Precautions should be taken to avoid strenuous outdoor
activities. Check on those vulnerable to heat stress. Stay
hydrated and wear light, loose fitted clothing.

(https://www.weather.gov/images/jan/graphicast/3.png)

.SPOTTER CALL TO ACTION STATEMENT...
The activation of storm spotters, HAM radio operators, and
emergency management personnel in support of severe weather
operations is not expected through next Thursday.

MSZ035-036-042-043-049-050-056-212215-
Humphreys-Holmes-Yazoo-Madison MS-Rankin-Scott-Smith-
503 PM CDT Fri Jul 20 2018

This hazardous weather outlook is for portions of central
Mississippi.

.DAY ONE...Tonight and Saturday

SEVERE THUNDERSTORMS
THREAT...Slight
TIMING...Mainly Tonight

EXCESSIVE HEAT
THREAT...Elevated
TIMING...Saturday

Severe storms will be possible late tonight as a disturbance
passes through the region. Wind gusts to 70 mph and quarter sized
hail will be possible. Heavy downpours may also lead to localized
flooding. Frequent dangerous lightning can also be expected.
Strong to severe storms may linger through Saturday morning.

By Saturday afternoon highs will be in the upper 90s and heat
indices will range from 105 to 110. Precautions should be taken to
avoid heat stress. Stay hydrated and wear light, loose fitted
clothing.

(https://www.weather.gov/images/jan/graphicast/1.png)
(https://www.weather.gov/images/jan/graphicast/3.png)

.DAYS TWO THROUGH SEVEN...Saturday night through Thursday

High temperatures from the mid to upper 90s will combine with
high humidity levels to produce heat indices near 105 Sunday.
Precautions should be taken to avoid strenuous outdoor activities.
Check on those vulnerable to heat stress. Stay hydrated and wear
light, loose fitted clothing.

(https://www.weather.gov/images/jan/graphicast/3.png)

.SPOTTER CALL TO ACTION STATEMENT...
The activation of storm spotters, HAM radio operators, and
emergency management personnel in support of severe weather
operations may be needed for portions of the region tonight
through Saturday.

MSZ041-047-048-053>055-061>065-072>074-212215-
Sharkey-Warren-Hinds-Claiborne-Copiah-Simpson-Franklin MS-Lincoln-
Lawrence-Jefferson Davis-Covington-Marion-Lamar-Forrest-
503 PM CDT Fri Jul 20 2018

This hazardous weather outlook is for portions of central
Mississippi, south central Mississippi, and west central
Mississippi.

.DAY ONE...Tonight and Saturday

SEVERE THUNDERSTORMS
THREAT...Marginal
TIMING...Tonight through Saturday

EXCESSIVE HEAT
THREAT...Elevated
TIMING...Saturday

Severe storms will be possible late tonight as a disturbance
passes through the region. Wind gusts to 60 mph and quarter sized
hail will be possible. Heavy downpours may also lead to localized
flooding. Frequent dangerous lightning can also be expected.
Strong to severe storms may linger through Saturday morning.

By Saturday afternoon highs will be in the upper 90s and heat
indices will range from 105 to 110. Precautions should be taken to
avoid heat stress. Stay hydrated and wear light, loose fitted
clothing.

(https://www.weather.gov/images/jan/graphicast/1.png)
(https://www.weather.gov/images/jan/graphicast/3.png)

.DAYS TWO THROUGH SEVEN...Saturday night through Thursday

High temperatures from the mid to upper 90s will combine with
high humidity levels to produce heat indices near 105 Sunday.
Precautions should be taken to avoid strenuous outdoor activities.
Check on those vulnerable to heat stress. Stay hydrated and wear
light, loose fitted clothing.

(https://www.weather.gov/images/jan/graphicast/3.png)

.SPOTTER CALL TO ACTION STATEMENT...
The activation of storm spotters, HAM radio operators, and
emergency management personnel in support of severe weather
operations may be needed for portions of the region tonight
through Saturday.

MSZ059-212215-
Jefferson-
503 PM CDT Fri Jul 20 2018

This hazardous weather outlook is for portions of southwest
Mississippi.

.DAY ONE...Tonight and Saturday

SEVERE THUNDERSTORMS
THREAT...Marginal
TIMING...Saturday

EXCESSIVE HEAT
THREAT...Elevated
TIMING...Saturday

Isolated strong to severe storms will be possible late tonight as
a disturbance passes through the region. Wind gusts to 70 mph and
quarter sized hail will be possible. Heavy downpours may also
lead to localized flooding. Frequent dangerous lightning can also
be expected. Strong to severe storms may linger through Saturday
morning.

By Saturday afternoon highs will be in the upper 90s and heat
indices will range from 105 to 110. Precautions should be taken to
avoid heat stress. Stay hydrated and wear light, loose fitted
clothing.

(https://www.weather.gov/images/jan/graphicast/1.png)
(https://www.weather.gov/images/jan/graphicast/3.png)

.DAYS TWO THROUGH SEVEN...Saturday night through Thursday

High temperatures from the mid to upper 90s will combine with
high humidity levels to produce heat indices 105 to 110 Sunday.
Precautions should be taken to avoid strenuous outdoor activities.
Check on those vulnerable to heat stress. Stay hydrated and wear
light, loose fitted clothing.

(https://www.weather.gov/images/jan/graphicast/3.png)

.SPOTTER CALL TO ACTION STATEMENT...
The activation of storm spotters, HAM radio operators, and
emergency management personnel in support of severe weather
operations may be needed for portions of the region Saturday.

MSZ066-212215-
Jones-
503 PM CDT Fri Jul 20 2018

This hazardous weather outlook is for portions of southeast
Mississippi.

.DAY ONE...Tonight and Saturday

SEVERE THUNDERSTORMS
THREAT...Marginal
TIMING...Tonight through Saturday

EXCESSIVE HEAT
THREAT...Limited
TIMING...Saturday

Isolated strong to severe storms will be possible late tonight as
a disturbance passes through the region. Wind gusts to 70 mph and
quarter sized hail will be possible. Heavy downpours may also
lead to localized flooding. Frequent dangerous lightning can also
be expected. Strong to severe storms may linger through Saturday
morning.

By Saturday afternoon highs will be in the upper 90s and heat
indices will range from 105 to 110. Precautions should be taken to
avoid heat stress. Stay hydrated and wear light, loose fitted
clothing.

(https://www.weather.gov/images/jan/graphicast/1.png)
(https://www.weather.gov/images/jan/graphicast/3.png)

.DAYS TWO THROUGH SEVEN...Saturday night through Thursday

High temperatures from the mid to upper 90s will combine with
high humidity levels to produce heat indices from 105 to 110
Sunday. Precautions should be taken to avoid strenuous outdoor
activities. Check on those vulnerable to heat stress. Stay
hydrated and wear light, loose fitted clothing.

(https://www.weather.gov/images/jan/graphicast/3.png)

.SPOTTER CALL TO ACTION STATEMENT...
The activation of storm spotters, HAM radio operators, and
emergency management personnel in support of severe weather
operations may be needed for portions of the region tonight
through Saturday.

21

&&

...HAZARD LEGEND...

*SEVERE THUNDERSTORMS*
High...Significant severe thunderstorms are expected.
Moderate...Severe storms expected with significant
 severe weather possible.
Enhanced...Severe storms expected.
Slight...Severe storms possible.
Marginal...Isolated severe storms possible.

*EXCESSIVE HEAT*
Extreme...Maximum heat index greater than 110 degrees for 3 or
 more days in a row and/or air temperatures greater than 107
 degrees.
Significant...Maximum heat index greater than 110 degrees
 and/or air temperatures greater than 105 degrees.
Elevated...Maximum heat index 105 to 110 degrees and/or air
 temperatures greater than 103 degrees.
Limited...Maximum heat index near 105 degrees and/or air
 temperatures 100 to 103 degrees.

...USEFUL WEATHER WEB PAGES (URLS)...

NWS JAN Home page...
   https://www.weather.gov/jan
Stay Aware, Stay Safe NWS JAN Briefing Page...
   https://www.weather.gov/jan/safe
Latest Weather Briefing...
   https://www.weather.gov/jan/weather_briefing

Tropical page...
   https://www.weather.gov/jan/srh/tropical?office=jan
National Hurricane Center Home Page...
   https://www.nhc.noaa.gov/
Find NWS JAN on Facebook...
   https://www.facebook.com/NWSJacksonMS
Follow NWS JAN on Twitter...
   @NWSJacksonMS
Follow NWS JAN on Youtube...
   https://www.youtube.com/user/NWSJacksonMiss

...ADDITIONAL URLS FOR SEVERE WEATHER ISSUES...

Storm Prediction Center (SPC)...
   https://www.spc.noaa.gov/
Meso Analysis...
   https://www.spc.noaa.gov/exper/mesoanalysis/
Day 1 through 3 Outlooks...
   https://www.spc.noaa.gov/products/outlook/
Storm Reports...
   https://www.spc.noaa.gov/climo/online/

In the hours before

Special weather statement, Jul 20, 11:27 PM CDT, 1 hour 12 minutes before
Special Weather Statement
National Weather Service Jackson MS
1127 PM CDT FRI JUL 20 2018

MSZ018-019-025-034-210515-
Washington MS-Leflore MS-Sunflower MS-Bolivar MS-
1127 PM CDT FRI JUL 20 2018

...A STRONG THUNDERSTORM WILL AFFECT SUNFLOWER...NORTHERN LEFLORE...
NORTHEASTERN WASHINGTON AND SOUTHEASTERN BOLIVAR COUNTIES UNTIL 1215
AM CDT...

At 1127 PM CDT, Meteorologists were tracking a strong thunderstorm
over Renova, or over Cleveland, moving southeast at 45 mph.

Dime size hail and wind gusts up to 50 mph will be possible with this
storm.

This strong thunderstorm will be near...
  Cleveland and Boyle around 1135 PM CDT.
  Ruleville around 1140 PM CDT.
  Blaine around 1150 PM CDT.
  Sunflower around 1155 PM CDT.
  Moorhead around 1205 AM CDT.

Other locations impacted by this storm include Doddsville, Schlater,
Pace and Merigold.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

High winds can bring down trees and large limbs resulting in serious
injury or property damage. Exercise extreme caution when outdoors
during such strong winds...and be especially aware of older trees.

&&

A Severe Thunderstorm Watch remains in effect until 500 AM CDT for
north central and northwestern Mississippi.

LAT...LON 3383 9045 3381 9045 3381 9040 3375 9029
      3373 9031 3370 9030 3370 9027 3373 9025
      3367 9013 3333 9071 3375 9104 3395 9068
TIME...MOT...LOC 0427Z 321DEG 37KT 3377 9076

GRG
Special weather statement, Jul 21, 12:09 AM CDT, 30 minutes before
Special Weather Statement
National Weather Service Jackson MS
1209 AM CDT SAT JUL 21 2018

MSZ019-025-027-035-036-210600-
Carroll MS-Humphreys MS-Leflore MS-Sunflower MS-Holmes MS-
1209 AM CDT SAT JUL 21 2018

...A STRONG THUNDERSTORM WILL AFFECT NORTHWESTERN HOLMES...
SOUTHEASTERN SUNFLOWER...SOUTHWESTERN CARROLL...SOUTHERN LEFLORE AND
NORTHEASTERN HUMPHREYS COUNTIES UNTIL 100 AM CDT...

At 1209 AM CDT, Meteorologists were tracking a strong thunderstorm
near Itta Bena, moving southeast at 30 mph.

Dime size hail and wind gusts up to 50 mph will be possible with this
storm.

This strong thunderstorm will be near...
  Quito around 1220 AM CDT.
  Swiftown around 1225 AM CDT.
  Sidon around 1230 AM CDT.
  Tchula around 1250 AM CDT.

Other locations impacted by this storm include Morgan City and
Cruger.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

High winds can bring down trees and large limbs resulting in serious
injury or property damage. Exercise extreme caution when outdoors
during such strong winds...and be especially aware of older trees.

&&

A Severe Thunderstorm Watch remains in effect until 500 AM CDT for
central, north central and northwestern Mississippi.

LAT...LON 3341 9058 3358 9036 3330 9001 3311 9033
TIME...MOT...LOC 0509Z 325DEG 27KT 3347 9040

GRG
Special weather statement, Jul 21, 12:16 AM CDT, 23 minutes before
Special Weather Statement
National Weather Service Jackson MS
1216 AM CDT SAT JUL 21 2018

MSZ019-210545-
Sunflower MS-
1216 AM CDT SAT JUL 21 2018

...A STRONG THUNDERSTORM WILL AFFECT NORTHEASTERN SUNFLOWER COUNTY
UNTIL 1245 AM CDT...

At 1215 AM CDT, Meteorologists were tracking a strong thunderstorm
over Mound Bayou, or near Shelby, moving southeast at 40 mph.

Wind gusts up to 50 mph will be possible with this storm.

This strong thunderstorm will be near...
  Drew around 1230 AM CDT.
  Ruleville around 1235 AM CDT.
  Blaine around 1245 AM CDT.

Other locations impacted by this storm include Doddsville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

High winds can bring down trees and large limbs resulting in serious
injury or property damage. Exercise extreme caution when outdoors
during such strong winds...and be especially aware of older trees.

&&

A Severe Thunderstorm Watch remains in effect until 500 AM CDT for
north central and northwestern Mississippi.

LAT...LON 3398 9045 3349 9045 3347 9048 3362 9066
      3399 9066
TIME...MOT...LOC 0515Z 306DEG 34KT 3386 9071

GRG
Special weather statement, Jul 21, 12:39 AM CDT, 0 minutes before
Special Weather Statement
National Weather Service Jackson MS
1239 AM CDT SAT JUL 21 2018

MSZ036-042-210615-
Yazoo MS-Holmes MS-
1239 AM CDT SAT JUL 21 2018

...A STRONG THUNDERSTORM WILL AFFECT SOUTHERN HOLMES AND NORTHEASTERN
YAZOO COUNTIES UNTIL 115 AM CDT...

At 1239 AM CDT, Meteorologists were tracking a strong thunderstorm
over Tolarville, or near Thornton, moving south at 40 mph.

Winds in excess of 40 mph will be possible with this storm.

This strong thunderstorm will be near...
  Brozville around 1245 AM CDT.
  Ebenezer around 1250 AM CDT.
  Vaughan around 110 AM CDT.

Other locations impacted by this storm include Eden.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

High winds can bring down trees and large limbs resulting in serious
injury or property damage. Exercise extreme caution when outdoors
during such strong winds...and be especially aware of older trees.

&&

A Severe Thunderstorm Watch remains in effect until 500 AM CDT for
central Mississippi.

LAT...LON 3298 8989 3284 8999 3283 9002 3278 9003
      3281 9046 3301 9041 3301 9037 3302 9038
      3308 9039 3316 9016
TIME...MOT...LOC 0539Z 337DEG 36KT 3306 9022

CME

The office that day

Everything else NWS Jackson, MS issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 20, 10:31 PM CDTTornado WarningJANBolivar45 min
Jul 20, 11:27 PM CDTSpecial Weather StatementJANBolivar, Sunflower48 min
Jul 20, 11:44 PM CDTSevere Thunderstorm WarningJANBolivar50 min
Jul 21, 12:09 AM CDTSpecial Weather StatementJANLeflore51 min
Jul 21, 12:16 AM CDTSpecial Weather StatementJANSunflower29 min
Jul 21, 3:45 AM CDTSpecial Weather StatementJANBolivar45 min
Jul 21, 4:01 AM CDTSevere Thunderstorm WarningJANBolivar, Sunflower59 min
Jul 21, 4:25 AM CDTSevere Thunderstorm WarningJANBolivar, Sunflower, Washington65 min
Jul 21, 4:28 AM CDTSevere Thunderstorm WarningJANCarroll, Grenada, Leflore62 min
Jul 21, 4:56 AM CDTSevere Thunderstorm WarningJANCarroll, Holmes, Humphreys64 min
Jul 21, 5:23 AM CDTSevere Thunderstorm WarningJANMadison, Yazoo56 min
Jul 21, 5:30 AM CDTSevere Thunderstorm WarningJANAttala, Leake48 min
Jul 21, 6:02 AM CDTSevere Thunderstorm WarningJANHinds, Rankin, Scott43 min
Jul 21, 2:27 PM CDTHeat AdvisoryJANAdams, Claiborne, Copiah, Covington, Forrest, Franklin and 6 more30 hr

Nearby

Special Weather Statements in Mississippi, 2018Every special weather statement in 2018

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.