Alert archive / Mississippi / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 289, NWS Jackson, MS

July 21, 2015Clay County, Mississippi

NWS Jackson, MS issued this severe thunderstorm warning at Jul 21, 2015, 3:33 PM CDT for Clay County, Mississippi. It was in force for 42 min. 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 21, 2015, 3:33 PM CDT (20:33 UTC)
Expired: Jul 21, 2015, 4:15 PM CDT
In force: 42 min
Issued by: NWS Jackson, MS
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

County Clay County, MS

The radar

The Columbus AFB radar (KGWX), 50 km from the middle of the area, began a volume at 20:34 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, 8.6 hours before the alert went out and 192 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: 1196 J/kg
Mixed-layer CIN: -82 J/kg
Mixed-layer LCL: 1131 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: -50 m²/s²
0-3 km storm-relative helicity: -13 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 severe thunderstorm 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 severe thunderstorm warning went out at Jul 21, 3:31 PM CDT, 2 minutes earlier.

Area forecast discussion, Jul 21, 3:31 PM CDT, 2 minutes before

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Hazardous weather outlook, Jul 21, 2:47 PM CDT, 46 minutes before

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In the hours before

Special weather statement, Jul 21, 1:27 PM CDT, 2 hours 6 minutes before

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Special weather statement, Jul 21, 1:30 PM CDT, 2 hours 3 minutes before

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Special weather statement, Jul 21, 1:36 PM CDT, 1 hour 57 minutes before

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Special weather statement, Jul 21, 2:02 PM CDT, 1 hour 31 minutes before

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Special weather statement, Jul 21, 2:33 PM CDT, 1 hour before

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Special weather statement, Jul 21, 3:28 PM CDT, 5 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, 12:44 PM CDT	Special Weather Statement	JAN	Oktibbeha	31 min
Jul 21, 1:27 PM CDT	Special Weather Statement	JAN	Oktibbeha	33 min
Jul 21, 1:30 PM CDT	Special Weather Statement	JAN	Lowndes	30 min
Jul 21, 1:36 PM CDT	Special Weather Statement	JAN	Lowndes	24 min
Jul 21, 2:02 PM CDT	Special Weather Statement	JAN	Lowndes	28 min
Jul 21, 2:33 PM CDT	Special Weather Statement	JAN	Montgomery	27 min
Jul 21, 3:28 PM CDT	Special Weather Statement	JAN	Clay	32 min
Jul 21, 5:07 PM CDT	Special Weather Statement	JAN	Jones	23 min
Jul 21, 6:29 PM CDT	Special Weather Statement	JAN	Smith	31 min
Jul 21, 6:54 PM CDT	Special Weather Statement	JAN	Clarke	36 min

Nearby

Severe Thunderstorm Warnings in Mississippi, 2015 Every severe thunderstorm warning in 2015

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.