Alert archive / Georgia / Mesoscale Discussions in 2020
Mesoscale Discussion 1877
The Storm Prediction Center issued this mesoscale discussion at Dec 24, 2020, 4:28 PM EST for 11 counties in Florida; 12 counties in Georgia. It was in force for 92 min.
The area
The outline as issued.
The facts
- Issued
- Dec 24, 2020, 4:28 PM EST (21:28 UTC)
- Expired
- Dec 24, 2020, 6:00 PM EST
- In force
- 92 min
- Issued by
- the Storm Prediction Center
- Concerning
- Severe potential...watch unlikely
- Chance of a watch
- 20%
All 23 counties
Baker County, FL, Bradford County, FL, Clay County, FL, Columbia County, FL, Duval County, FL, Gilchrist County, FL, Hamilton County, FL, Lafayette County, FL, Nassau County, FL, Suwannee County, FL, Union County, FL, Appling County, GA, Bacon County, GA, Brantley County, GA, Camden County, GA, Charlton County, GA, Clinch County, GA, Echols County, GA, Glynn County, GA, Long County, GA, Pierce County, GA, Ware County, GA, Wayne County, GA
The radar
The Jacksonville radar (KJAX), 64 km from the middle of the area, began a volume at 21:32 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
Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 9.5 hours before the alert went out and 196 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
- 944 m above ground
- 0-6 km bulk shear
- 60 kt
- 0-1 km storm-relative helicity
- 346 m²/s²
- 0-3 km storm-relative helicity
- 416 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 |
|---|---|---|---|---|
| Dec 24, 2:02 AM EST | Mesoscale Discussion | SPC | Escambia, Okaloosa, Santa Rosa | 58 min |
| Dec 24, 2:42 AM EST | Tornado Watch | SPC | Escambia, Okaloosa, Santa Rosa | 7 hr |
| Dec 24, 6:23 AM EST | Mesoscale Discussion | SPC | Bay, Gulf, Walton, Washington | 2 hr |
| Dec 24, 1:11 PM EST | Mesoscale Discussion | SPC | Gadsden, Jefferson, Leon, Liberty, Madison, Taylor and 1 more | 94 min |
Nearby
Mesoscale Discussions in Georgia, 2020Mesoscale Discussions in Florida, 2020Every mesoscale discussion in 2020
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.