13 August 2004 0034 Line of convective cells to NE has evolved into a bow shaped echo. (A bow-echo? don't know enough to attempt a guess... the radial velocity field appears quite complex, maybe some in-storm rotation?) Zebra PD detects some hail in the highest reflectivities cores in the "right" branch of this echo. Overall, this afternoon convection has produced so far considerable precipitation, the most of it concentrated in the SE quadrant. 0100 The bow shaped echo has been gradually loosing its pattern and now appears less organized. The gust front of the system has triggered new convection, which is now observed very close to the radar ~ 30 km E of S-Pol. System to the SWE still shows leading active cores of convection, at ~ 80-100 km of the radar, with a large stratiform further away from the radar. In general, although the center of action has been mainly focused in the NE-SE sector, development of convection has been observed in other regions over land (NW sector), thus preventing switching to sector scanning. 0131 Cells approaching S-Pol from the east.... will we get some rain?! 0146 Ligthning and thunders from the close by cells.. also some drizzle... 0200 The lightning show out there is really impressive. Convective echoes appear again to be shaped in a bow like feature. Highest reflectivities are ~ 55 dBZ. 0230 Cells over the NW sector, which have been observed developing in the last couple of hours are also growing in intensity. Some of the high reflectivity cores at ~ 150 km range to N-NW have PD-identified hail. 0247 I have noticed that new sequence had not started at 0245. Restarted manually. will resync at next scan. 0308 Argh!... I forgot to resync.... started writing report and got distracted... antenna has stopped scanning in the last 6 minutes!.. started a new scan to at least take rainmap... 0315 resynced... 0345 submitted report. In the mean time, cells to the N-NW sector still appear very active. Raining at the site. 0400 Gustavo on duty. 0430 A SSE-NNW oriented line continues to propagate towards the coast. This line is currently over S-pol producing light rainfall at the radar site. 0448 The sequence did not start at 0445. Antenna was not moving at all. I stopped antenna, reset the PMAC and re-started Climo Near sequence 3 minutes and 42 seconds behind the scheduled time, so I this scan sequence will not be complete. 0500 Resynched antenna in Climo Near sequence. 0600 Still raining at the S-pol site. 0700 Still raining. 0800 And raining still. 0900 Rain has stopped. A convective line perpendicular to the coastline has developed ~75 km SE opf S-pol (near Mazatlan) and is moving northwestward towards the radar. 1000 The convective line that was moving towards the radar began to dissipate. Stratiform area N-NW or radar dissipating rapidly over land, while the echoes in to the S-SE are persisting and are mostly found over the Gulf. 1145 The most significant stratiform echoes are now to the south of S-pol. Since these echoes are further away from S-pol and can be scanned at antenna angles less than 14 degrees, the scan sequence was switched to Climo Far. 1200 Gustavo signing out. 1330 TL & SN here. Stratform rain echo dissipating over water but there is a new cell over the water @ 286 deg and 131 km; Zh up to 50 dBZ. 1341 Switching PRFs to do micro scans on the oceanic cell. 1345 Running Far135 with RHIs on 284 deg. Storm just inside range. 1349 Appears to be a few tiny cells S & E of the developed cell - will hope that these go up as well as cells did yesterday at this time and location 1355 RHIs not too impressive. 1404 Will try slowing down RHI Az rate to 2 deg/sec to get better vert res (only going up to 20 deg elev) 1405 RHIs at 284,5 1415 Manual resynch; RHIs to 273,5 to cover the newer cells, which also aren't very impressive. 1430 Profiler scans to date 22 July 1000 UTC 22 July 2200 UTC 31 July 0045 UTC 01 Aug 0145 UTC 03 Aug 1730 UTC 03 Aug 1800 UTC 03 Aug 1830 UTC 09 Aug 0615 UTC 1439 RHIs reveal quite shallow precip with no anvil. 1500 Back to 720 Hz and ClimoShallow 1602 Someone stole our raingage, or it was otherwise lost. ClimoDead scanning continues. 1708 Yup, still dead. 1800 Stopped for generator maintenance, ETA ~1 hr. 'Tis quite dead out there. 1837 Restarted in ClimoShallow. Well, doesn't look like we missed much. 'Tis still quite dead. 1845 Resynched in ClimoShallow. 1915 Had to resynch manually because antenna did not start. Synch was ~30 sec late. Still very dead. 1927 Some weak cells 60 km to NE; still being topped by shallow mode. 1945 ClimoFar to ensure topping of NE cells, which have reached 50 dBZ. 2000 Simona here. Running ClimoFar, keeping an eye on the NE cells. 2045 Still running ClimoFar, Cells to the NE at 60-80 km range over the mountain are still active. Also, some new activity is found over th elevated terrain to the SE, at ~150 km. Not very impressive, though, and shallow. 2122 All convection (which does not show a high degree of organization) is confined over land. I thought about switching to a microphysical scan, but there are new cells firing up at a distance larger that 150 km. If everything gets within 150 km, will consider sector scans. 2200 All convection still being topped. Active centers for convection remand mountains to the NE and E of S-Pol at ~ 100-120 km. Some new cells developed to the N at ~180 km range. 2220 Most intense cells are to E in between 60 and 100 km. They are alligned on a SW-NE line. Cross-sections through this line show tops up to 14 km, but core reflectivities are not higher than 52 dBZ.In general, cells appeared scattered, almost all over the place over land. 2300 Convection to the NE has produced new cells on the northeasternmost side, while leaving a stratiform region behind this edge. Convection over mountains to the E-SE appears to be stationary, with new cells regeneration in more or less the same location of previous, dissipated convection. 2340 A new cell in the system to the NE shows very high dBZ. This cell is at ~80 km. A cross section through it shows that high dBZ cores (~60 dBZ) are elevated, up to 7 km, with tops around 12 km. PD identifies hail in this cell. 2348 This cell is going up pretty fast. Now cross section through the 60 dBZ core shows tops to ~ 15 km....