CASE 20 - Nocturnal landbreeze front convection


Microphysical scans 0930 - 1145 Z, 2h 15m




IOP status - end of IOP #7 (see report). The IOP was originally scheduled to end 12 Z on 8/7/04, but models suggested a very wet pattern during the third 24h period that would last into 8/8 prompting the extension.


An upper-level 250 mb high moved across the AZ/MX border, bringing easterly flow into the southern zones of Tier 1. The evening of 8/7, the easterly flow around the UL high pushed precipitation in the southern Tier 1 zones towards the W Mexico coast.


IV#9 S of Baja.


TW#30 and IV#10 present in the tropics.


















Day 0 forecast discussion text



200 mb - model.ETA.200408081200.00_200mb_wnd.gif

500 mb - model.ETA.200408081200.00_500mb_wnd.gif

700 mb - model.ETA.200408081200.00_700mb_wnd.gif

850 mb - model.ETA.200408081200.00_850mb_wnd.gif


Mazatlan SkewT - ops.SkewT.200408080900.Mazatlan_MX.gif - ops.SkewT.200408081200.Mazatlan_MX.gif





S-Pol log - spol_080804.txt




0800 Z

Fine landbreeze front moving offshore to the W of S-Pol.


0800Z, Base reflectivity


0930 Z

Begin Microphysical Scanning, Switching to MicroFar135: A few cells are initiating along the landbreeze front as it moves offshore. Cells are located ~90 km S of S-Pol. Centered sector at 227 deg.


0930Z, Base reflectivity


0945 Z

Switching to MicroFar90: Centered on 205 deg. Convection is isolated enough to fit in smaller sector.


0945Z, Base reflectivity


1145 Z

End Microphysical Scanning, Switching to ClimoFar: Cells along landbreeze front dissipating, cells forming over SMO.


1145Z, Base reflectivity