Alert archive / Mississippi / Heat Advisories in 2017

Heat Advisory 7, NWS Jackson, MS

August 18, 201747 counties in Mississippi; 9 parishes in Louisiana; Ashley County, Chicot County, Arkansas

NWS Jackson, MS issued this heat advisory at Aug 18, 2017, 3:02 PM CDT for 47 counties in Mississippi; 9 parishes in Louisiana; Ashley County, Chicot County, Arkansas. It took effect at Aug 19, 2017, 11:00 AM CDT. It was in force for 32 hr.

The area

The counties it named.

The facts

Issued: Aug 18, 2017, 3:02 PM CDT (20:02 UTC)
In effect from: Aug 19, 2017, 11:00 AM CDT
Expired: Aug 20, 2017, 7:00 PM CDT
In force: 32 hr
Issued by: NWS Jackson, MS

All 58 counties

Ashley County, AR, Chicot County, AR, Catahoula Parish, LA, Concordia 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, Adams County, MS, Attala County, MS, Bolivar County, MS, Carroll County, MS, Choctaw County, MS, Claiborne County, MS, Clarke County, MS, Clay County, MS, Copiah County, MS, Covington County, MS, Forrest County, MS, Franklin County, MS, Grenada County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Jasper County, MS, Jefferson County, MS, Jefferson Davis County, MS, Jones County, MS, Kemper County, MS, Lamar County, MS, Lauderdale County, MS, Lawrence County, MS, Leake County, MS, Leflore County, MS, Lincoln County, MS, Lowndes County, MS, Madison County, MS, Marion County, MS, Montgomery County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Oktibbeha County, MS, Rankin County, MS, Scott County, MS, Sharkey County, MS, Simpson County, MS, Smith County, MS, Sunflower County, MS, Warren County, MS, Washington County, MS, Webster County, MS, Winston County, MS, Yazoo County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 32 km from the middle of the area, began a volume at 20:03 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

Slidell Radar S, LA (KSIL), launched 12:00Z, 8.0 hours before the alert went out and 256 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: 1431 J/kg
Mixed-layer CIN: -42 J/kg
Mixed-layer LCL: 890 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: -31 m²/s²
0-3 km storm-relative helicity: -24 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this heat advisory 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 heat advisory went out at Aug 18, 12:47 PM CDT, 2 hours 15 minutes earlier.

Area forecast discussion, Aug 18, 12:47 PM CDT, 2 hours 15 minutes before

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Hazardous weather outlook, Aug 18, 4:43 AM CDT, 10 hours 19 minutes before

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In the hours before

Special weather statement, Aug 18, 2:19 PM CDT, 43 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 18, 2:19 PM CDT	Special Weather Statement	JAN	Rankin	41 min
Aug 18, 3:15 PM CDT	Special Weather Statement	JAN	Madison	45 min
Aug 18, 4:37 PM CDT	Special Weather Statement	JAN	Simpson	23 min
Aug 18, 4:53 PM CDT	Special Weather Statement	JAN	Jefferson Davis	37 min

Nearby

Heat Advisories in Mississippi, 2017 Heat Advisories in Louisiana, 2017 Heat Advisories in Arkansas, 2017 Every heat advisory in 2017

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.