Alert archive / Louisiana / Tornado Watches in 2014

Tornado Watch 195

May 28, 201419 parishes in Louisiana; 8 counties in Mississippi

The Storm Prediction Center issued this tornado watch at May 28, 2014, 9:47 AM CDT for 19 parishes in Louisiana; 8 counties in Mississippi. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued: May 28, 2014, 9:47 AM CDT (14:47 UTC)
Expired: May 28, 2014, 5:00 PM CDT
In force: 7 hr
Issued by: the Storm Prediction Center
Largest hail expected: 0.5 in
Strongest gust expected: 60 kt

All 27 counties

Ascension Parish, LA, Assumption Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Jefferson Parish, LA, Lafourche Parish, LA, Livingston Parish, LA, Orleans Parish, LA, Plaquemines Parish, LA, Saint Bernard Parish, LA, Saint Charles Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Martin Parish, LA, Saint Tammany Parish, LA, St. Mary Parish, LA, Tangipahoa Parish, LA, Terrebonne Parish, LA, Vermilion Parish, LA, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Pearl River County, MS, Perry County, MS, Stone County, MS

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes: 30%
One or more EF2 to EF5 tornadoes: 10%
Ten or more severe wind reports: 20%
One or more gusts of 65 knots or more: 5%
Ten or more severe hail reports: 10%
One or more hailstones of 2 inches or more: 5%
Six or more combined severe hail and wind reports: 50%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
May 28, 10:02 AM CDT	Tornado Warning	LIX	Ascension	28 min
May 28, 10:52 AM CDT	Flash Flood Warning	LCH	Acadia, Iberia, Lafayette, Saint Landry, Saint Martin, St. Mary and 1 more	4 hr
May 28, 11:25 AM CDT	Tornado Warning	LIX	Livingston, Saint Helena, Tangipahoa	20 min
May 28, 11:35 AM CDT	Flash Flood Warning	LIX	Ascension, Assumption, East Baton Rouge, Iberville, Livingston, Saint James	115 min
May 28, 11:45 AM CDT	Tornado Warning	LIX	Tangipahoa	30 min
May 28, 2:48 PM CDT	Flash Flood Warning	MOB	George, Perry, Stone	3 hr

Discussions around it

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

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 2.8 hours before the alert went out and 117 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: 2001 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 657 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 57 m²/s²
0-3 km storm-relative helicity: 89 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 28, 9:26 AM CDT	Mesoscale Discussion	SPC	Ascension, Assumption, East Baton Rouge, Iberia, Iberville, Jefferson and 16 more	64 min
May 28, 1:26 PM CDT	Mesoscale Discussion	SPC	Ascension, Assumption, Iberville, Jefferson, Lafourche, Livingston and 12 more	64 min
May 28, 4:02 PM CDT	Mesoscale Discussion	SPC	George, Greene, Harrison, Jackson, Perry, Stone	58 min

Nearby

Tornado Watches in Louisiana, 2014 Tornado Watches in Mississippi, 2014 Every tornado watch in 2014

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.