Alert archive / Louisiana / Mesoscale Discussions in 2017
Mesoscale Discussion 1107
The Storm Prediction Center issued this mesoscale discussion at Jun 21, 2017, 7:47 AM CDT for 4 states. It was in force for 118 min.
The area
The outline as issued.
The facts
- Issued
- Jun 21, 2017, 7:47 AM CDT (12:47 UTC)
- Expired
- Jun 21, 2017, 9:45 AM CDT
- In force
- 118 min
- Issued by
- the Storm Prediction Center
All 26 counties
Baldwin County, AL, Mobile County, AL, Escambia County, FL, Okaloosa County, FL, Santa Rosa County, FL, Walton County, FL, Ascension Parish, LA, Assumption Parish, LA, Iberia 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 Tammany Parish, LA, St. Mary Parish, LA, Terrebonne Parish, LA, George County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Stone County, MS
The watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Slidell Radar S, LA (KSIL), launched 12:00Z, 0.8 hours before the alert went out and 54 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.
- Mixed-layer CAPE
- 262 J/kg
- Mixed-layer CIN
- -75 J/kg
- Mixed-layer LCL
- 465 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 485 m²/s²
- 0-3 km storm-relative helicity
- 506 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 5.3
The text
As transmitted.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 20, 8:15 PM CDT | Mesoscale Discussion | SPC | Baldwin, Mobile | 3 hr |
| Jun 20, 9:48 PM CDT | Mesoscale Discussion | SPC | Baldwin, Mobile | 57 min |
| Jun 20, 10:24 PM CDT | Tornado Watch | SPC | Baldwin, Mobile | 12 hr |
| Jun 21, 2:08 AM CDT | Mesoscale Discussion | SPC | Baldwin, Mobile | 2 hr |
| Jun 21, 10:01 AM CDT | Tornado Watch | SPC | Baldwin, Covington, Escambia, Mobile | 9 hr |
| Jun 21, 3:42 PM CDT | Mesoscale Discussion | SPC | Baldwin, Mobile | 93 min |
| Jun 21, 6:29 PM CDT | Mesoscale Discussion | SPC | Baldwin, Conecuh, Covington, Escambia, Mobile, Washington | 61 min |
| Jun 21, 6:45 PM CDT | Tornado Watch | SPC | Baldwin, Butler, Clarke, Conecuh, Covington, Crenshaw and 5 more | 8 hr |
Nearby
Mesoscale Discussions in Louisiana, 2017Mesoscale Discussions in Mississippi, 2017Mesoscale Discussions in Florida, 2017Every mesoscale discussion 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.