Alert archive / Texas / Winter Storm Watches in 2011

Winter Storm Watch 3, NWS Shreveport, LA

February 7, 201116 counties in Texas; 11 parishes in Louisiana; 9 counties in Arkansas

NWS Shreveport, LA issued this winter storm watch at Feb 7, 2011, 3:40 PM CST for 16 counties in Texas; 11 parishes in Louisiana; 9 counties in Arkansas. It took effect at Feb 9, 2011, 12:00 AM CST. It was in force for .

The area

The counties it named.

The facts

Issued: Feb 7, 2011, 3:40 PM CST (21:40 UTC)
In effect from: Feb 9, 2011, 12:00 AM CST
Expired: Feb 8, 2011, 4:18 PM CST
In force
Issued by: NWS Shreveport, LA

All 36 counties

Columbia County, AR, Hempstead County, AR, Howard County, AR, Lafayette County, AR, Little River County, AR, Miller County, AR, Nevada County, AR, Sevier County, AR, Union County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Jackson Parish, LA, Lincoln Parish, LA, Ouachita Parish, LA, Red River Parish, LA, Union Parish, LA, Webster Parish, LA, Bowie County, TX, Camp County, TX, Cass County, TX, Cherokee County, TX, Franklin County, TX, Gregg County, TX, Harrison County, TX, Marion County, TX, Morris County, TX, Panola County, TX, Red River County, TX, Rusk County, TX, Smith County, TX, Titus County, TX, Upshur County, TX, Wood County, TX

The radar

The Shreveport radar (KSHV), 51 km from the middle of the area, began a volume at 21:42 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

Lake Charles Mun, LA (KLCH), launched 12:00Z, 9.7 hours before the alert went out and 317 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: 806 m above ground
0-6 km bulk shear: 97 kt
0-1 km storm-relative helicity: -153 m²/s²
0-3 km storm-relative helicity: -23 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 winter storm watch 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 winter storm watch went out at Feb 7, 3:17 PM CST, 23 minutes earlier.

Area forecast discussion, Feb 7, 3:17 PM CST, 23 minutes before

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Hazardous weather outlook, Feb 7, 6:01 AM CST, 9 hours 39 minutes before

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      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
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        The site you requested is temporarily down for maintenance or an unexpected outage.
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        Please try again in a few minutes.
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        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 6, 6:40 PM CST	Severe Thunderstorm Warning	SHV	Shelby	35 min
Feb 6, 7:44 PM CST	Severe Thunderstorm Warning	SHV	Bienville, Bossier, Webster	33 min

Nearby

Winter Storm Watches in Texas, 2011 Winter Storm Watches in Louisiana, 2011 Winter Storm Watches in Arkansas, 2011 Every winter storm watch in 2011

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.