Alert archive / Louisiana / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 192, NWS Shreveport, LA

August 18, 2018Caldwell Parish, Winn Parish, Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at Aug 18, 2018, 6:59 PM CDT for Caldwell Parish, Winn Parish, Louisiana. It was in force for 31 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: Aug 18, 2018, 6:59 PM CDT (23:59 UTC)
Expired: Aug 18, 2018, 7:30 PM CDT
In force: 31 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Caldwell Parish, LA, Winn Parish, LA

The radar

The Ft Polk radar (KPOE), 111 km from the middle of the area, began a volume at 00:05 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, 12.0 hours before the alert went out and 219 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: 1565 J/kg
Mixed-layer CIN: -40 J/kg
Mixed-layer LCL: 715 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: 6 m²/s²
0-3 km storm-relative helicity: 93 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 Shreveport, LA wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 18, 6:30 PM CDT, 29 minutes earlier.

Area forecast discussion, Aug 18, 6:30 PM CDT, 29 minutes before

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Hazardous weather outlook, Aug 18, 12:08 PM CDT, 6 hours 51 minutes before

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In the hours before

Special weather statement, Aug 18, 4:39 PM CDT, 2 hours 20 minutes before

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Special weather statement, Aug 18, 5:36 PM CDT, 1 hour 23 minutes before

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Special weather statement, Aug 18, 6:10 PM CDT, 49 minutes before

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Special weather statement, Aug 18, 6:43 PM CDT, 16 minutes before

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Special weather statement, Aug 18, 6:53 PM CDT, 6 minutes before

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Special weather statement, Aug 18, 6:54 PM CDT, 5 minutes before

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The office that day

Everything else NWS Shreveport, LA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 18, 6:54 PM CDT	Special Weather Statement	SHV	Nacogdoches	36 min
Aug 17, 7:20 PM CDT	Special Weather Statement	SHV	De Soto	25 min
Aug 17, 7:27 PM CDT	Special Weather Statement	SHV	LaSalle	33 min
Aug 17, 8:21 PM CDT	Special Weather Statement	SHV	Grant, LaSalle	39 min
Aug 18, 4:39 PM CDT	Special Weather Statement	SHV	Caldwell	36 min
Aug 18, 5:36 PM CDT	Special Weather Statement	SHV	Caddo	24 min
Aug 18, 6:10 PM CDT	Special Weather Statement	SHV	Ouachita	20 min
Aug 18, 6:43 PM CDT	Special Weather Statement	SHV	Caldwell	32 min
Aug 18, 6:53 PM CDT	Special Weather Statement	SHV	Jackson	22 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2018 Every severe thunderstorm 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.