With lingering outflow boundaries present across the region, storms developed during the late afternoon into the evening hours on July 19th and 20th, with a few storms lingering late into the night. These storms produced damaging winds and some hail across portions of Central Mississippi.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS JAN wrote it up.
With lingering outflow boundaries present across the region, storms developed during the late afternoon into the evening hours on July 19th and 20th, with a few storms lingering late into the night. These storms produced damaging winds and some hail across portions of Central Mississippi.
The local office's own words before the first event, 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 the first event at Jul 19, 11:36 AM CST, 1 hour 59 minutes earlier.
Area Forecast Discussion...UPDATED
National Weather Service Jackson MS
1236 PM CDT Thu Jul 19 2018
.UPDATE...
Updated for 18Z aviation discussion
&&
.AVIATION...
18Z TAF discussion:
Mostly isolated convection this afternoon will affect GWO, GTR,
MEI, HBG and PIB with brief lowerings of ceiling and visibility
and gusty winds. Another area of storms may move into the GLH,
GWO, JAN, HKS and MEI areas during the evening then diminish
around midnight. Otherwise, mostly VFR conditions will prevail.
MVFR visibilities in fog will develop after midnight and linger
through mid morning Friday./26/
&&
.DISCUSSION...
Satellite imagery this morning showing prominent MCV over northeast
MS moving southeast across gradient of high 0-3km theta-e. Its
locally modified wind field has been responsible for the forcing
that has led to the active convection in that area already this
morning. While that localized convective area will move into AL
shortly, more convection should get going in the east during the
afternoon along the theta-e axis. Some of that convection may
become robust as checklist indicating some chance of microbursts
during peak heating. Modified JAN 12Z sounding highlighted by CAPE
of 4166 J/kg, LI of -9, 0-3 km lapse rate of 9.2C/km and surface
theta-e of 366K. /26/
Prior discussion below:
Today and Tonight...A stalled and washing out front currently
resides just to my north, as an outflow boundary loses momentum as
it drifts south across far southern portions of the CWA this
morning. Both of these features could result in some showers and
isolated storms bubbling up over the CWA first thing this morning.
Otherwise, any low stratus or fog that developed across the CWA
during the overnight hours, will begin to erode after sunrise this
morning.
Strong high pressure centered over the Four Corners region will
shift east and deeper into the Lower Mississippi River Valley
through the period. While chances for afternoon and evening showers
and storms will remain in the forecast, the best rain chances will
shift mainly over East and Southeast Mississippi today. As has been
the case the past couple of days, a few strong storms can't be ruled
out, neither can a stray storm reaching severe limits. However,
with continued low confidence and overall coverage of such activity,
I'll refrain from introducing such wording in the HWO. Still, gusty
winds, frequent lightning, and torrential downpours can be expected
with any storms that develop during the period.
Activity will begin to dissipate during the evening hours as daytime
heating is lost, with much of the tonight period remaining quiet.
However, as the CWA remains under persistent northwest flow aloft,
we'll have to continually monitor upstream for any MCS or related
outflow activity that could approach or move into the CWA overnight
into early Friday morning. Currently, given the diurnal minimum in
which this scenario would unfold, again after midnight and before
sunrise early Friday, any activity associated with either an MCS or
outflow boundary impeding upon the CWA is expected to be sub-severe.
The bigger story during the period will be the ensuing heat as the
aforementioned high aloft builds into the region from the west. This
combination of heat, as highs range from the mid 90s to around the
century mark, and humidity, dew points in the 70s, will result in
afternoon heat index values ranging from 105-110 across mainly
central and western portions of the CWA today. Therefore, a Heat
Advisory will be in effect from 10 AM until 7 PM. Conditions
tonight will remain mild and muggy with lows falling into the 70s
areawide. /19/
Friday through Wednesday...The primary concerns will be heat
stress and rain chances along with muggy conditions through
period.
The period will be characterized by anomalous mid to upper ridging
west to mid to upper troughing over eastern conus. This will bring
northwest flow to the region during the period. The ridging will
expant east to the region on Friday. This will set up the regime of
anomalous low to midlevel temps over the region through the weekend.
This will result in highs in the middle to upper 90s with some
triple digit numbers west of the MS River. This will bring heat
indices from the around 105 to 113. The warmest indices will be over
the western areas mainly Friday and Saturday,which will decrease in
coverage on Sunday. So will maintain the heat risk in the HWO for
Friday through Sunday. Models indicate that isolated strong storms
will be possible on Friday into Friday night with northwest flow
aloft. We will have 0-3km winds of around 35 knots, Vertical totals
in the lower 30s in the north,a frontal passage for lift, and good
lapse rates. CAM guidance shows a good line passing in the TN valley
to the north, however if future runs push that line farther south an
outflow boundary could definitely increase strong storm coverage in
our unstable airmass. For now will hold off on any marginal risk for
day 2. As we push through the weekend the axis of the upper trough
will spread over the remainder of the region by Sunday. An
associated upper low will with another frontal boundary will push
south across the Lower Mississippi Valley On Tuesday. The weak closed
low will push into the northern gulf by Wednesday. This will keep
rain chances across the region for the upcoming workweek with our
soupy airmass./17/
As far as temperatures are concern beyond this weekend with the
frontal passage readings will tone back to mainly the lower 90s.
Lows will be in the lower to middle 70s. /17/
&&
.PRELIMINARY POINT TEMPS/POPS...
Jackson 94 74 97 76 / 12 11 17 12
Meridian 90 73 97 77 / 38 14 28 24
Vicksburg 95 76 98 76 / 7 11 7 4
Hattiesburg 92 74 96 77 / 43 19 29 10
Natchez 95 76 97 77 / 11 11 12 2
Greenville 94 75 98 76 / 13 18 14 12
Greenwood 93 75 96 76 / 16 20 22 27
&&
.JAN WATCHES/WARNINGS/ADVISORIES...
MS...Heat Advisory until 7 PM CDT this evening for MSZ018-019-025>027-
034>036-040>043-047>049-053>055-059>063.
LA...Heat Advisory until 7 PM CDT this evening for LAZ007>009-015-016-
023>026.
AR...Heat Advisory until 7 PM CDT this evening for ARZ074-075.
&&Hazardous Weather Outlook...UPDATED National Weather Service Jackson MS 918 AM CDT Thu Jul 19 2018 ARZ074-075-LAZ007>009-015-016-023>026-MSZ018-019-025-034>036- 040>042-047-048-053-054-059>062-201430- Ashley-Chicot-Morehouse-West Carroll-East Carroll-Richland- Madison LA-Franklin LA-Catahoula-Tensas-Concordia-Bolivar- Sunflower-Leflore-Washington-Humphreys-Holmes-Issaquena-Sharkey- Yazoo-Warren-Hinds-Claiborne-Copiah-Jefferson-Adams-Franklin MS- Lincoln- 918 AM CDT Thu Jul 19 2018 This hazardous weather outlook is for portions of southeast Arkansas, northeast Louisiana, central Mississippi, north central Mississippi, northwest Mississippi, south central Mississippi, southwest Mississippi, and west central Mississippi. .DAY ONE...Today and Tonight EXCESSIVE HEAT THREAT...Elevated TIMING...Today Temperatures warming into the mid 90 to near 100 will combine with high humidity levels to produce heat indices from 105 to 110, mainly during the afternoon today. 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/1.png) .DAYS TWO THROUGH SEVEN...Friday through Wednesday High temperatures from the upper 90s to near 100 will combine with high humidity levels to produce heat indices around 110 each afternoon from Friday through Monday. 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/2.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 Wednesday. MSZ029>033-038-039-044>046-050>052-056>058-064>066-072>074-201430- Webster-Clay-Lowndes-Choctaw-Oktibbeha-Winston-Noxubee-Leake- Neshoba-Kemper-Scott-Newton-Lauderdale-Smith-Jasper-Clarke- Jefferson Davis-Covington-Jones-Marion-Lamar-Forrest- 918 AM CDT Thu Jul 19 2018 This hazardous weather outlook is for portions of central Mississippi, east central Mississippi, north central Mississippi, northeast Mississippi, south central Mississippi, and southeast Mississippi. .DAY ONE...Today and Tonight SEVERE THUNDERSTORMS THREAT...Marginal TIMING...Today EXCESSIVE HEAT THREAT...Limited TIMING...Today Isolated severe thunderstorms will be possible this afternoon. Damaging wind gusts up to 60 mph and hail up to the size of quarters will be the primary severe weather threats. (https://www.weather.gov/images/jan/graphicast/3.png) Temperatures warming into the mid to upper 90s will combine with high humidity levels to produce heat indices around 105 during the afternoon today. 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/1.png) .DAYS TWO THROUGH SEVEN...Friday through Wednesday High temperatures from the mid to upper 90s will combine with high humidity levels to produce heat indices 105 to 110 each afternoon from Friday through Monday. 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/2.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 today. MSZ026>028-037-043-049-055-063-201430- Grenada-Carroll-Montgomery-Attala-Madison MS-Rankin-Simpson- Lawrence- 918 AM CDT Thu Jul 19 2018 This hazardous weather outlook is for portions of central Mississippi, north central Mississippi, and south central Mississippi. .DAY ONE...Today and Tonight EXCESSIVE HEAT THREAT...Limited TIMING...Today Temperatures warming into the mid to upper 90s will combine with high humidity levels to produce heat indices around 105 during the afternoon today. 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/1.png) .DAYS TWO THROUGH SEVEN...Friday through Wednesday High temperatures from the mid to upper 90s will combine with high humidity levels to produce heat indices 105 to 110 each afternoon from Friday through Monday. 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/2.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 Wednesday. 26 && ...HAZARD LEGEND... *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. *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. ...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/
The Jackson/Brandon,MS radar (KDGX), 49 km away, was scanning. The volume nearest the first event began at 19:34 UTC.
14 thunderstorm wind, 1 hail. Local standard time, as filed.
Trees were blown down in Forest, with some on power lines.
A couple of trees were blown down in Morton.
Trees were blown down in Lake.
Trees were blown down near the Morriston Community, along Mars Hill Road and County Line Road.
Trees and power lines were blown down on Watson Drive.
A swath of hail fell across west central Bolivar County as a severe thunderstorm tracked south. Nickel to quarter size hail fell just west of Alligator while half dollar size hail fell near Pace.
A swath of damaging winds occurred across west central Bolivar County as a severe thunderstorm tracked south. A few trees were blown down in Duncan and multiple trees were blown down in Pace. A 40mph wind gust was observed at Cleveland Municipal Airport. There were also multiple trees snapped and damage to farm buildings and sheds about six miles southeast of Benoit and trees were blown down across town in Shaw.
A 74 mph wind gust measured at Greenville Mid Delta Regional Airport and a 47mph sustained wind was measured.
A few power lines were blown down and some trees were blown down across roads around town.
A few trees were blown down.
A tree was blown down along Highway 433 between Bentonia and Satartia.
A few power lines were blown down and a tree was blown onto a house.
A power line was blown down and trees were blown down across town.
A tree was blown down along Highway 12 E.
A tree was blown down in Deasonville.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Mississippi in 2018Every state in 2018This day in weather historyWarnings in Mississippi, July 2018
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 759837, 759838, 759839, 759841, 759840, 759844, 759846, 759848, 759849, 759851, 759852, 759853, 759854, 759855, 759856.