Alert archive / Florida / Mesoscale Discussions in 2018
Mesoscale Discussion 1638
The Storm Prediction Center issued this mesoscale discussion at Nov 12, 2018, 11:25 AM CST for 4 states. It was in force for 95 min.
The area
The outline as issued.
The facts
- Issued
- Nov 12, 2018, 11:25 AM CST (17:25 UTC)
- Expired
- Nov 12, 2018, 1:00 PM CST
- In force
- 95 min
- Issued by
- the Storm Prediction Center
All 29 counties
Baldwin County, AL, Covington County, AL, Escambia County, AL, Geneva County, AL, Mobile County, AL, Bay County, FL, Calhoun County, FL, Escambia County, FL, Gulf County, FL, Holmes County, FL, Jackson County, FL, Liberty County, FL, Okaloosa County, FL, Santa Rosa County, FL, Walton County, FL, Washington County, FL, Jefferson Parish, LA, Lafourche Parish, LA, Orleans Parish, LA, Plaquemines Parish, LA, Saint Bernard Parish, LA, Saint Charles Parish, LA, Saint John the Baptist Parish, LA, Saint Tammany Parish, LA, George County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Stone County, MS
The radar
The Mobile radar (KMOB), 79 km from the middle of the area, began a volume at 17:24 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 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, 5.4 hours before the alert went out and 191 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 425 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 472 m²/s²
- 0-3 km storm-relative helicity
- 487 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 5.2
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 |
|---|---|---|---|---|
| Nov 12, 4:34 AM CST | Tornado Watch | SPC | Baldwin, Mobile | 7 hr |
| Nov 12, 7:54 AM CST | Mesoscale Discussion | SPC | Baldwin, Mobile | 2 hr |
| Nov 12, 11:46 AM CST | Tornado Watch | SPC | Baldwin, Coffee, Covington, Dale, Escambia, Geneva and 3 more | 7 hr |
| Nov 12, 3:51 PM CST | Mesoscale Discussion | SPC | Coffee, Covington, Dale, Geneva, Henry, Houston | 114 min |
| Nov 12, 4:01 AM CST | Mesoscale Discussion | SPC | Ascension, Assumption, Iberia, Jefferson, Lafourche, Orleans and 9 more | 2 hr |
Nearby
Mesoscale Discussions in Florida, 2018Mesoscale Discussions in Louisiana, 2018Mesoscale Discussions in Alabama, 2018Every mesoscale discussion in 2018
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.