1. CSTAR HSLC Case Study Feb. 18, 2009 NWS Peachtree City, GA (FFC)
Trisha Palmer, Steve Nelson, Adam Baker

2. Case Overview 2200Z 0100Z 0400Z Strong 100kt+ upper jet across SE
Potent mb sfc low tracks NE across Great Lakes region
Associated frontal features impact CWA
Discrete cells initially after 20z well ahead of cold front in warm sector – later evolving into QLCS
2200Z
0100Z
0400Z

3. Environmental Parameters
SBCAPE / MLCAPE: ~ J/kg
MUCAPE: ~ J/kg
0-6 km Shear: ~70-80 kts
0-1 km Shear: ~30-40 kts
0-3 km SRH: ~ m^2/s^2
0-1 km SRH: ~ m^2/s^2
STP: 1-2
0-1 km SRH: 00Z

4. Paths from SPC’s Online Severe Plot
Cell Trend Analysis
~ Z C4 C3 C7 C2 C5 C6 C1
Paths from SPC’s Online Severe Plot
7 discrete tornadic cells
GR2Analyst to analyze data from GSP, FFC, JGX, BMX radars (whichever provided best sampling of particular storm)
Logged various data including Vr, NROT, ET height, VIL beginning ~1hr prior to initial tornadogenesis

5. Cell Trend Analysis

6. Cell Trend Analysis

7. Cell Trend Analysis

8. Cell Trend Analysis

9. Additional Details More to follow in full report
Nearly all tornadic cells had hook echoes and BWERs for majority of analyzed period
Several cells appeared to have mergers/boundary interactions