Alert archive / Mississippi / Heat Advisories in 2017

Heat Advisory 3, NWS Jackson, MS

July 22, 201722 counties in Mississippi; 7 parishes in Louisiana; Ashley County, Chicot County, Arkansas

NWS Jackson, MS issued this heat advisory at Jul 22, 2017, 3:45 AM CDT for 22 counties in Mississippi; 7 parishes in Louisiana; Ashley County, Chicot County, Arkansas. It took effect at Jul 22, 2017, 11:00 AM CDT. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued: Jul 22, 2017, 3:45 AM CDT (08:45 UTC)
In effect from: Jul 22, 2017, 11:00 AM CDT
Expired: Jul 22, 2017, 7:00 PM CDT
In force: 8 hr
Issued by: NWS Jackson, MS

All 31 counties

Ashley County, AR, Chicot County, AR, East Carroll Parish, LA, Franklin Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Richland Parish, LA, Tensas Parish, LA, West Carroll Parish, LA, Attala County, MS, Bolivar County, MS, Carroll County, MS, Choctaw County, MS, Clay County, MS, Grenada County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Kemper County, MS, Leflore County, MS, Lowndes County, MS, Montgomery County, MS, Noxubee County, MS, Oktibbeha County, MS, Sharkey 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), 93 km from the middle of the area, began a volume at 08:45 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, 8.8 hours before the alert went out and 86 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: 1096 J/kg
Mixed-layer CIN: -65 J/kg
Mixed-layer LCL: 1367 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: -20 m²/s²
0-3 km storm-relative helicity: -2 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

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 Jul 22, 12:20 AM CDT, 3 hours 25 minutes earlier.

Area forecast discussion, Jul 22, 12:20 AM CDT, 3 hours 25 minutes before

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Hazardous weather outlook, Jul 21, 10:15 PM CDT, 5 hours 30 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
Jul 21, 7:42 PM CDT	Special Weather Statement	JAN	Montgomery	33 min
Jul 21, 8:11 PM CDT	Special Weather Statement	JAN	Adams	34 min
Jul 21, 8:13 PM CDT	Special Weather Statement	JAN	Jasper	32 min
Jul 21, 8:40 PM CDT	Special Weather Statement	JAN	Smith	35 min
Jul 21, 8:50 PM CDT	Severe Thunderstorm Warning	JAN	Scott, Smith	25 min
Jul 21, 9:18 PM CDT	Special Weather Statement	JAN	Scott	42 min
Jul 21, 9:42 PM CDT	Special Weather Statement	JAN	Rankin	48 min
Jul 22, 8:50 AM CDT	Special Weather Statement	JAN	Attala	55 min
Jul 22, 4:07 PM CDT	Special Weather Statement	JAN	Copiah	38 min
Jul 22, 4:12 PM CDT	Special Weather Statement	JAN	Marion	33 min
Jul 22, 4:21 PM CDT	Special Weather Statement	JAN	Lincoln	24 min
Jul 22, 4:32 PM CDT	Special Weather Statement	JAN	Franklin	28 min
Jul 22, 5:10 PM CDT	Special Weather Statement	JAN	Franklin	35 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.