CASE 36 - Afternoon convection over SMO develops into multicellular system

8/20-21/04

Microphysical scans 2345 - 0200 Z, 2h 15m

 

 

SYNOPTIC CONDITIONS SUMMARY:

 

Weak ripples moving through the west-northwest flow aloft coupled with upper-level divergence boosted thunderstorms that initially developed over the higher terrain of Arizona and western/central New Mexico.

 

Deep westerly flow over southern Sonora and Sinaloa kept diurnally-driven storms from moving off the SMO.

 
 

 

 

 

 

 

 

 


Day 0 forecast discussion text

 

Winds

200 mb - model.ETA.200408210000.00_200mb_wnd.gif

500 mb - model.ETA.200408210000.00_500mb_wnd.gif

700 mb - model.ETA.200408210000.00_700mb_wnd.gif

850 mb - model.ETA.200408210000.00_850mb_wnd.gif

 

 

 

MESOSCALE SUMMARY:

 

0024Z, GOES-10 Vis

 

24 h precipitation totals -

 

S-POL SUMMARY:

 

S-Pol log - spol_082004.txt - spol_082104.txt

 

SCAN OVERVIEW:

 

2319 Z

Cell near 80 km, 90 deg looks pretty good. Definitely the strongest thing out there.

 

2345 Z

Switched PRFs and now running MicroFar135 on the intense eastern cell. This will not cover every cell out there, and may not top some close-in cells, but this main cell is the best case out there right now so I have tailored the scans toward it.

 

2345Z, Base reflectivity

 

0011 Z

Last day! I have been continually adjusting the PPI center to maximize coverage of both the main storm, which is now an impressive multicell system, as well as every other smaller storm I can. Sacrificies are being made on these smaller storms, however.

 

0015Z, Base reflectivity

 

0040 Z

Main storm still hanging in there, with heavy rain and high reflectivities aloft.

 

0045Z, Base reflectivity

 

0053 Z

PPI just barely topped new development near 60 km & 55 deg. RHIs on this cell.

 

0128 Z

Merger between separate multicell storms has kicked off the latest intensification - will it last past sunset?

 

0130Z, Base reflectivity

 

0200 Z

Switching back to 720 Hz due to the unfortunate passing of the main storm. think echo intensity is decreasing overall. Sunset is having the requisite effect.

 

0200Z, Base reflectivity