Alert archive / Mississippi / Excessive Heat Warnings in 2018

Excessive Heat Warning 1, NWS Jackson, MS

July 20, 20188 counties in Mississippi; 8 parishes in Louisiana; Ashley County, Chicot County, Arkansas

NWS Jackson, MS issued this excessive heat warning at Jul 20, 2018, 9:25 AM CDT for 8 counties in Mississippi; 8 parishes in Louisiana; Ashley County, Chicot County, Arkansas. It took effect at Jul 20, 2018, 11:00 AM CDT. It was in force for 9 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jul 20, 2018, 9:25 AM CDT (14:25 UTC)
In effect from
Jul 20, 2018, 11:00 AM CDT
Expired
Jul 20, 2018, 8:00 PM CDT
In force
9 hr
Issued by
NWS Jackson, MS

Counties Ashley County, AR, Chicot County, AR, Catahoula Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Richland Parish, LA, Tensas Parish, LA, West Carroll Parish, LA, Bolivar County, MS, Humphreys County, MS, Issaquena County, MS, Leflore County, MS, Sharkey County, MS, Sunflower County, MS, Warren County, MS, Washington County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 127 km from the middle of the area, began a volume at 14:28 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 12:00Z, 2.4 hours before the alert went out and 117 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 12:00Z on 2018-07-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1428 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 12:00Z on 2018-07-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 56 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
1428 J/kg
Mixed-layer CIN
-119 J/kg
Mixed-layer LCL
986 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
56 m²/s²
0-3 km storm-relative helicity
153 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.7

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this excessive heat warning 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 excessive heat warning went out at Jul 20, 5:45 AM CDT, 3 hours 40 minutes earlier.

Area forecast discussion, Jul 20, 5:45 AM CDT, 3 hours 40 minutes before
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Hazardous weather outlook, Jul 20, 4:12 AM CDT, 5 hours 13 minutes before
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In the hours before

Local storm report, Jul 20, 8:52 AM CDT, 33 minutes before
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Local storm report, Jul 20, 8:54 AM CDT, 31 minutes before
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Local storm report, Jul 20, 9:04 AM CDT, 21 minutes before
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Local storm report, Jul 20, 9:05 AM CDT, 20 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE JACKSON MS
905 AM CDT FRI JUL 20 2018

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

0943 PM     HAIL             3 W ALLIGATOR           34.09N 90.77W
07/19/2018  E1.00 INCH       BOLIVAR            MS   PUBLIC

            NICKEL TO QUARTER SIZE HAIL JUST WEST OF
            ALLIGATOR.

&&

TW
Local storm report, Jul 20, 9:14 AM CDT, 11 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE JACKSON MS
914 AM CDT FRI JUL 20 2018

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

1202 AM     TSTM WND DMG     HOLLANDALE              33.17N 90.85W
07/20/2018                   WASHINGTON         MS   LAW ENFORCEMENT

            A FEW POWER LINES DOWN AND SOME TREES ACROSS
            ROADS/STREETS AROUND TOWN.

&&

CE
Local storm report, Jul 20, 9:20 AM CDT, 5 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE JACKSON MS
920 AM CDT FRI JUL 20 2018

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

1039 PM     HAIL             PACE                    33.79N 90.86W
07/19/2018  E1.25 INCH       BOLIVAR            MS   PUBLIC

&&

TW

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 19, 9:31 PM CDTSevere Thunderstorm WarningJANBolivar, Sunflower59 min
Jul 19, 9:58 PM CDTSevere Thunderstorm WarningJANBolivar, Sunflower62 min
Jul 19, 10:47 PM CDTSevere Thunderstorm WarningJANBolivar, Sunflower, Washington73 min
Jul 19, 11:25 PM CDTSpecial Weather StatementJANGrenada50 min
Jul 19, 11:39 PM CDTSevere Thunderstorm WarningJANHolmes, Humphreys, Leflore, Sharkey, Washington66 min
Jul 19, 11:48 PM CDTSevere Thunderstorm WarningJANCarroll, Grenada, Montgomery22 min
Jul 20, 12:41 AM CDTSpecial Weather StatementJANIssaquena, Sharkey, Yazoo64 min
Jul 20, 1:14 AM CDTSpecial Weather StatementJANMadison, Yazoo46 min
Jul 20, 1:24 AM CDTSevere Thunderstorm WarningJANHinds, Madison, Warren, Yazoo53 min
Jul 20, 1:27 AM CDTSevere Thunderstorm WarningJANAttala, Holmes, Leake, Madison, Yazoo36 min
Jul 20, 2:10 AM CDTSpecial Weather StatementJANHinds, Rankin50 min
Jul 20, 11:56 AM CDTSpecial Weather StatementJANBolivar49 min
Jul 20, 12:34 PM CDTSpecial Weather StatementJANSunflower41 min
Jul 20, 12:51 PM CDTSevere Thunderstorm WarningJANLeflore, Sunflower54 min
Jul 20, 1:31 PM CDTSevere Thunderstorm WarningJANCarroll, Holmes, Humphreys, Leflore59 min
Jul 20, 2:08 PM CDTSevere Thunderstorm WarningJANAttala, Holmes, Madison, Yazoo67 min
Jul 20, 2:35 PM CDTSpecial Weather StatementJANRankin25 min
Jul 20, 2:55 PM CDTSpecial Weather StatementJANMadison35 min
Jul 20, 4:10 PM CDTHeat AdvisoryJANAdams, Bolivar, Claiborne, Copiah, Covington, Forrest and 21 more28 hr
Jul 20, 4:28 PM CDTSpecial Weather StatementJANCovington32 min

Nearby

Excessive Heat Warnings in Mississippi, 2018Excessive Heat Warnings in Louisiana, 2018Excessive Heat Warnings in Arkansas, 2018Every excessive heat warning 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.