Alert archive / Georgia / Mesoscale Discussions in 2015

Mesoscale Discussion 22

January 4, 201513 counties in Florida; 50 counties in Georgia; 9 counties in South Carolina

The Storm Prediction Center issued this mesoscale discussion at Jan 4, 2015, 10:28 AM EST for 13 counties in Florida; 50 counties in Georgia; 9 counties in South Carolina. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued
Jan 4, 2015, 10:28 AM EST (15:28 UTC)
Expired
Jan 4, 2015, 12:00 PM EST
In force
92 min
Issued by
the Storm Prediction Center
All 72 counties

Baker County, FL, Columbia County, FL, Duval County, FL, Hamilton County, FL, Jefferson County, FL, Lafayette County, FL, Leon County, FL, Madison County, FL, Nassau County, FL, Suwannee County, FL, Taylor County, FL, Union County, FL, Wakulla County, FL, Appling County, GA, Atkinson County, GA, Bacon County, GA, Ben Hill County, GA, Berrien County, GA, Brantley County, GA, Brooks County, GA, Bryan County, GA, Bulloch County, GA, Burke County, GA, Camden County, GA, Candler County, GA, Charlton County, GA, Chatham County, GA, Clinch County, GA, Coffee County, GA, Colquitt County, GA, Cook County, GA, Dodge County, GA, Echols County, GA, Effingham County, GA, Emanuel County, GA, Evans County, GA, Glynn County, GA, Irwin County, GA, Jeff Davis County, GA, Jefferson County, GA, Jenkins County, GA, Johnson County, GA, Lanier County, GA, Laurens County, GA, Liberty County, GA, Long County, GA, Lowndes County, GA, McIntosh County, GA, Montgomery County, GA, Pierce County, GA, Richmond County, GA, Screven County, GA, Tattnall County, GA, Telfair County, GA, Thomas County, GA, Tift County, GA, Toombs County, GA, Treutlen County, GA, Ware County, GA, Washington County, GA, Wayne County, GA, Wheeler County, GA, Wilcox County, GA, Aiken County, SC, Allendale County, SC, Bamberg County, SC, Barnwell County, SC, Beaufort County, SC, Colleton County, SC, Hampton County, SC, Jasper County, SC, Orangeburg County, SC

The radar

The Moody AFB radar (KVAX), 109 km from the middle of the area, began a volume at 15:30 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

Jacksonville, FL (KJAX), launched 12:00Z, 3.5 hours before the alert went out and 160 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, Jacksonville, FL at 12:00Z on 2015-01-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 160 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, Jacksonville, FL at 12:00Z on 2015-01-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 166 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
160 J/kg
Mixed-layer CIN
-58 J/kg
Mixed-layer LCL
632 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
166 m²/s²
0-3 km storm-relative helicity
154 m²/s²
Significant tornado parameter
0.1
Supercell composite
2.8

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jan 4, 2:19 AM ESTMesoscale DiscussionSPCEscambia, Okaloosa, Santa Rosa, Walton86 min
Jan 4, 8:48 AM ESTMesoscale DiscussionSPCBay, Calhoun, Franklin, Gadsden, Gulf, Jackson and 4 more87 min
Jan 4, 11:37 AM ESTTornado WatchSPCBaker, Columbia, Dixie, Gilchrist, Hamilton, Jefferson and 7 more5 hr
Jan 4, 1:39 PM ESTMesoscale DiscussionSPCColumbia, Hamilton, Lafayette, Madison, Suwannee, Taylor96 min
Jan 4, 3:57 PM ESTMesoscale DiscussionSPCAlachua, Baker, Bradford, Clay, Duval, Nassau and 3 more63 min
Jan 3, 8:54 PM ESTMesoscale DiscussionSPCChattooga, Dade, Floyd, Haralson, Polk, Walker66 min

Nearby

Mesoscale Discussions in Georgia, 2015Mesoscale Discussions in Florida, 2015Mesoscale Discussions in South Carolina, 2015Every mesoscale discussion in 2015

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.