Alert archive / Louisiana / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 564, NWS Jackson, MS

October 22, 2009Adams County, Mississippi; Catahoula Parish, Concordia Parish, Louisiana

NWS Jackson, MS issued this severe thunderstorm warning at Oct 22, 2009, 2:38 PM CDT for Adams County, Mississippi; Catahoula Parish, Concordia Parish, Louisiana. It was in force for 82 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: Oct 22, 2009, 2:38 PM CDT (19:38 UTC)
Expired: Oct 22, 2009, 4:00 PM CDT
In force: 82 min
Issued by: NWS Jackson, MS
Area: Storm-based polygon

Counties Catahoula Parish, LA, Concordia Parish, LA, Adams County, MS

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Oct 22, 11:58 AM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 7.6 hours before the alert went out and 169 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 843 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 194 m²/s²
0-3 km storm-relative helicity: 250 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 Oct 22, 11:15 AM CDT, 3 hours 23 minutes earlier.

Area forecast discussion, Oct 22, 11:15 AM CDT, 3 hours 23 minutes before

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Hazardous weather outlook, Oct 22, 12:55 PM CDT, 1 hour 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
Oct 22, 10:59 AM CDT	River Flood Warning	JAN	Yazoo	23 hr
Oct 22, 10:59 AM CDT	River Flood Warning	JAN	Sharkey	48 hr
Oct 22, 5:59 PM CDT	Severe Thunderstorm Warning	JAN	Issaquena, Sharkey	61 min
Oct 22, 6:00 PM CDT	Flash Flood Warning	JAN	Issaquena	3 hr
Oct 22, 6:45 PM CDT	Severe Thunderstorm Warning	JAN	Issaquena, Sharkey, Washington	60 min
Oct 22, 6:55 PM CDT	Severe Thunderstorm Warning	JAN	Copiah, Franklin, Jefferson, Lincoln	65 min
Oct 22, 4:47 PM CDT	Severe Thunderstorm Warning	JAN	Franklin, Madison, Tensas	58 min
Oct 22, 5:28 PM CDT	Severe Thunderstorm Warning	JAN	East Carroll, Franklin, Madison, Richland	62 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2009 Severe Thunderstorm Warnings in Mississippi, 2009 Every severe thunderstorm warning in 2009

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.