Alert archive / Louisiana / Special Weather Statements in 2017

Special Weather Statement, NWS Shreveport, LA

April 17, 2017Caddo Parish, Louisiana

NWS Shreveport, LA issued this special weather statement at Apr 17, 2017, 2:20 PM CDT for Caddo Parish, Louisiana. It was in force for 40 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Apr 17, 2017, 2:20 PM CDT (19:20 UTC)
Expired: Apr 17, 2017, 3:00 PM CDT
In force: 40 min
Issued by: NWS Shreveport, LA

County Caddo Parish, LA

The radar

The Shreveport radar (KSHV), 12 km from the middle of the area, began a volume at 19:20 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

Fort Worth, TX (KFWD), launched 12:00Z, 7.3 hours before the alert went out and 324 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: 430 J/kg
Mixed-layer CIN: -110 J/kg
Mixed-layer LCL: 940 m above ground
0-6 km bulk shear: 4 kt
0-1 km storm-relative helicity: 28 m²/s²
0-3 km storm-relative helicity: -14 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Apr 17, 1:03 PM CDT, 1 hour 17 minutes earlier.

Area forecast discussion, Apr 17, 1:03 PM CDT, 1 hour 17 minutes before

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Hazardous weather outlook, Apr 17, 12:12 PM CDT, 2 hours 8 minutes before

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In the hours before

Local storm report, Apr 17, 9:08 AM CDT, 5 hours 12 minutes before

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Special weather statement, Apr 17, 2:20 PM CDT, 0 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
Apr 17, 4:05 AM CDT	Special Weather Statement	SHV	Red River	55 min
Apr 17, 5:18 AM CDT	Flash Flood Warning	SHV	Red River	7 hr
Apr 17, 6:14 PM CDT	Special Weather Statement	SHV	Angelina	46 min
Apr 17, 2:41 AM CDT	Special Weather Statement	SHV	McCurtain	64 min
Apr 17, 3:14 AM CDT	Special Weather Statement	SHV	McCurtain	61 min
Apr 17, 5:18 AM CDT	Special Weather Statement	SHV	McCurtain	57 min

Nearby

Special Weather Statements in Louisiana, 2017 Every special weather statement 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.