CASE 8 - Cellular activity over SMO


Microphysical scans 2300 - 0230 Z, 3h 30m






IOP status - No IOP at this time.


A ridge axis oriented NW-SE over central Mexico was pulling drier air into Tier 1 - time period characterized by low to moderate convective activity over Tier 1.


Prevalence of moisture at low-levels in Sinaloa region credited for thunderstorm development in S-Pol domain.

Synoptic feature map


Day 0 forecast discussion text



200 mb - model.ETA.200407180000.00_200mb_wnd.gif

500 mb - model.ETA.200407180000.00_500mb_wnd.gif

700 mb - model.ETA.200407180000.00_700mb_wnd.gif

850 mb - model.ETA.200407180000.00_850mb_wnd.gif


Mazatlan SkewT - ops.SkewT.200407180000.Mazatlan_MX.gif



EVENT SUMMARY: Groups of cells formed in the foothills and mountains during the evening hours, probably due to diurnal heating. Cell movement was generally in the W-NW direction.


2324 Z, GOES-10 Vis


24 h precipitation totals -



S-POL SUMMARY: Sector scans were initiated as cellular activity moved with 80 km of S-Pol. Several cells had tops > 16 km and ZDR columns extending ~1 km above the freezing level. Peak ZDR values below the freezing level were ~3.5 dB. New cell growth was focused upwind (east) of cells over the SMO.


S-Pol log - spol_071704.txt - spol_071804.txt


2330Z, Base Reflectivity


2338Z, Cross section of reflectivity in intense cell - >50 DBZ up to 10 km in the core.


2338 Z, Cross Section of ZDR in intense cell -





Starting MicroFar135: 135 degree sector scans centered on 70 deg.M ost active area appears to be cell group @ 60 deg az 120 km distance.



Switching to MicroNear135: Cells close (within 50 km) of S-Pol warrants change to near-mode. Center of sector scans also changed in order to capture cells in NE quadrant.



Cell complex to NE showing small hail on particle ID. Shifting center of sector scans to 35 deg.


Several cells possessing excessive anvils.



30 km NE of S-Pol: Cells appears to have put out outflow bddy and new cell development occurring.



End Microphysical Scanning, Switching to ClimoNear: Cell activity diminishing.