Alert archive / Louisiana / Tornado Watches in 2008

Tornado Watch 325

May 15, 20084 states

The Storm Prediction Center issued this tornado watch at May 15, 2008, 4:16 AM CDT for 4 states. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
May 15, 2008, 4:16 AM CDT (09:16 UTC)
Expired
May 15, 2008, 11:00 AM CDT
In force
7 hr
Issued by
the Storm Prediction Center
All 86 counties

Ashley County, AR, Chicot County, AR, Desha County, AR, Drew County, AR, Lincoln County, AR, Acadia Parish, LA, Allen Parish, LA, Ascension Parish, LA, Assumption Parish, LA, Avoyelles Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Baton Rouge Parish, LA, East Carroll Parish, LA, East Feliciana Parish, LA, Evangeline Parish, LA, Franklin Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Jefferson Davis Parish, LA, Jefferson Parish, LA, Lafayette Parish, LA, Lafourche Parish, LA, Livingston Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Orleans Parish, LA, Plaquemines Parish, LA, Pointe Coupee Parish, LA, Richland Parish, LA, Saint Bernard Parish, LA, Saint Charles Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA, Saint Tammany Parish, LA, St. Mary Parish, LA, Tangipahoa Parish, LA, Tensas Parish, LA, Terrebonne Parish, LA, Vermilion Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Carroll Parish, LA, West Feliciana Parish, LA, Adams County, MS, Amite County, MS, Attala County, MS, Bolivar County, MS, Carroll County, MS, Choctaw County, MS, Claiborne County, MS, Copiah County, MS, Franklin County, MS, Grenada County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Jefferson County, MS, Jefferson Davis County, MS, Lawrence County, MS, Leake County, MS, Leflore County, MS, Lincoln County, MS, Madison County, MS, Marion County, MS, Montgomery County, MS, Pike County, MS, Rankin County, MS, Scott County, MS, Sharkey County, MS, Simpson County, MS, Sunflower County, MS, Walthall County, MS, Warren County, MS, Washington County, MS, Webster County, MS, Wilkinson County, MS, Yazoo County, MS, Jefferson County, TX, Orange County, TX

The radar

The Jackson/Brandon,MS radar (KDGX), 142 km from the middle of the area, began a volume at 09:18 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.

Warnings issued inside it

37 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
May 15, 4:28 AM CDTFlash Flood WarningJANHolmes, Yazoo5 hr
May 15, 4:41 AM CDTSevere Thunderstorm WarningLCHAllen, Avoyelles, Beauregard, Evangeline, Rapides, Vernon64 min
May 15, 4:58 AM CDTSevere Thunderstorm WarningLCHAcadia, Allen, Beauregard, Calcasieu, Cameron, Jefferson Davis47 min
May 15, 4:59 AM CDTTornado WarningLCHCameron, Vermilion31 min
May 15, 5:12 AM CDTSevere Thunderstorm WarningJANFranklin, Richland78 min
May 15, 5:28 AM CDTTornado WarningLCHAcadia, Vermilion19 min
May 15, 5:29 AM CDTSevere Thunderstorm WarningJANCatahoula, Concordia, Franklin46 min
May 15, 5:43 AM CDTSevere Thunderstorm WarningLCHAcadia, Cameron, Jefferson Davis, Lafayette, Saint Landry, Saint Martin and 1 more47 min
May 15, 6:13 AM CDTTornado WarningLCHLafayette, Vermilion32 min
May 15, 6:15 AM CDTTornado WarningLCHVermilion30 min
May 15, 6:29 AM CDTSevere Thunderstorm WarningLCHIberia, Lafayette, Saint Landry, Saint Martin, St. Mary, Vermilion76 min
May 15, 6:30 AM CDTFlash Flood WarningJANHinds, Madison, Rankin3 hr
May 15, 6:33 AM CDTTornado WarningLCHLafayette, Saint Landry, Saint Martin27 min
May 15, 6:38 AM CDTTornado WarningLCHVermilion21 min
May 15, 6:40 AM CDTFlash Flood WarningLIXLivingston3 hr
May 15, 6:46 AM CDTSevere Thunderstorm WarningJANTensas59 min
May 15, 6:58 AM CDTFlash Flood WarningJANEast Carroll3 hr
May 15, 6:59 AM CDTFlash Flood WarningLIXEast Baton Rouge, Iberville, Pointe Coupee, West Baton Rouge3 hr
May 15, 7:09 AM CDTFlash Flood WarningLIXTangipahoa3 hr
May 15, 7:23 AM CDTSevere Thunderstorm WarningLIXEast Baton Rouge, Iberville, West Baton Rouge67 min
May 15, 7:33 AM CDTFlash Flood WarningJANHinds, Issaquena, Sharkey, Warren, Yazoo117 min
May 15, 7:42 AM CDTSevere Thunderstorm WarningLIXAscension, Assumption, Saint James63 min
May 15, 7:45 AM CDTSevere Thunderstorm WarningLCHIberia, Saint Martin, St. Mary16 min
May 15, 8:09 AM CDTFlash Flood WarningJANScott, Smith2 hr
May 15, 8:16 AM CDTSevere Thunderstorm WarningLIXLivingston44 min
May 15, 8:24 AM CDTFlash Flood WarningLIXAscension2 hr
May 15, 8:27 AM CDTSevere Thunderstorm WarningLIXJefferson, Lafourche, Orleans, Plaquemines, Saint Bernard, Saint Charles and 1 more48 min
May 15, 8:37 AM CDTSevere Thunderstorm WarningLIXSaint Tammany, Tangipahoa38 min
May 15, 8:50 AM CDTSevere Thunderstorm WarningLIXWashington40 min
May 15, 9:03 AM CDTSevere Thunderstorm WarningJANLamar, Marion57 min
May 15, 9:09 AM CDTSevere Thunderstorm WarningLIXJefferson, Plaquemines, Saint Bernard66 min
May 15, 9:13 AM CDTTornado WarningLIXWashington32 min
May 15, 9:15 AM CDTSevere Thunderstorm WarningLIXSaint Tammany15 min
May 15, 9:29 AM CDTFlash Flood WarningJANAttala, Hinds, Holmes, Humphreys, Madison, Rankin and 1 more91 min
May 15, 9:41 AM CDTTornado WarningJANForrest, Lamar, Marion49 min
May 15, 9:58 AM CDTFlash Flood WarningJANForrest, Lamar, Marion102 min
May 15, 10:28 AM CDTFlash Flood WarningJANLeake, Scott, Smith72 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Jackson, MS (KJAN), launched 00:00Z, 9.3 hours before the alert went out and 135 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-pSkew-T log-p diagram, Jackson, MS at 00:00Z on 2008-05-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 645 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Jackson, MS at 00:00Z on 2008-05-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 258 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
645 J/kg
Mixed-layer CIN
-29 J/kg
Mixed-layer LCL
536 m above ground
0-6 km bulk shear
66 kt
0-1 km storm-relative helicity
258 m²/s²
0-3 km storm-relative helicity
407 m²/s²
Significant tornado parameter
0.7
Supercell composite
3.3

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 15, 1:16 AM CDTTornado WatchSPCBradley, Calhoun, Clark, Cleveland, Columbia, Dallas and 10 more6 hr
May 15, 5:54 AM CDTMesoscale DiscussionSPCAshley, Chicot, Drew96 min
May 15, 2:11 AM CDTMesoscale DiscussionSPCAcadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 11 more94 min
May 15, 7:41 AM CDTMesoscale DiscussionSPCAscension, Assumption, East Baton Rouge, East Feliciana, Iberville, Jefferson and 17 more94 min
May 15, 8:42 AM CDTMesoscale DiscussionSPCAscension, Assumption, East Baton Rouge, East Feliciana, Iberville, Jefferson and 17 more63 min
May 15, 8:58 AM CDTTornado WatchSPCForrest, George, Greene, Hancock, Harrison, Jackson and 5 more6 hr
May 15, 12:28 PM CDTMesoscale DiscussionSPCGeorge, Greene, Perry, Stone, Wayne92 min
May 14, 7:06 PM CDTMesoscale DiscussionSPCAtascosa, Bandera, Bexar, Blanco, Brown, Burnet and 30 more54 min
May 14, 7:50 PM CDTTornado WatchSPCBastrop, Bell, Bosque, Brazos, Burleson, Caldwell and 30 more6 hr
May 14, 7:53 PM CDTMesoscale DiscussionSPCBrooks, Hidalgo, Jim Hogg, Starr, Zapata67 min
May 14, 10:02 PM CDTMesoscale DiscussionSPCAustin, Bandera, Bastrop, Bell, Bexar, Blanco and 76 more88 min
May 14, 11:40 PM CDTMesoscale DiscussionSPCAnderson, Angelina, Cherokee, Gregg, Henderson, Houston and 9 more65 min
May 15, 6:24 PM CDTMesoscale DiscussionSPCDimmit, Maverick66 min

Nearby

Tornado Watches in Louisiana, 2008Tornado Watches in Mississippi, 2008Tornado Watches in Arkansas, 2008Every tornado watch in 2008

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.