CASE 18 - Long-lived,
right-turning MCS develops E of S-Pol
Microphysical scans 1930 - 2130 Z, 2h
(MCS lifetime: 1930 - 8/6 1100 Z)
SYNOPTIC CONDITIONS SUMMARY:
Synoptic
feature map - MISSING
Day
0 forecast discussion text
Winds
200
mb - model.ETA.200408060000.00_200mb_wnd.gif
500
mb - model.ETA.200408060000.00_500mb_wnd.gif
700
mb - model.ETA.200408060000.00_700mb_wnd.gif
850
mb - model.ETA.200408060000.00_850mb_wnd.gif
EVENT SUMMARY: A quasi-linear / asymmetric MCS developed over the SMO just N of Mazatlan, propagated towards S-Pol,
and then moved NW along the coastal plain.
24
h precipitation totals -
TIMELINE
OF DEVELOPMENT:
|
1930
Z |
Deep
convection initiates to the E of S-Pol, along the
SMO. 1940Z, GOES-10
|
|
2030
Z |
Deep
convective region to the E of S-Pol growing, look
more organized. 2024Z, GOES-10
|
|
2230
Z |
Leading
convective region takes on a linear shape w/ a trailing stratiform region to
the E. 2224Z, GOES-10 Thermal IR
|
|
2300
- 8/6 1130 Z |
MCS
turns to the right, moving N/NW. The MCS maintains a leading convective
line/complex with a trailing stratiform region (to the S/SE). Main convective
activity has dissipated by 1130 Z. 0324Z, GOES-10 Thermal IR
0724Z, GOES-10 Thermal IR
1124Z, GOES-10 Thermal IR
|
S-POL SUMMARY:
S-Pol log - spol_080504.txt
SCAN
OVERVIEW:
|
1900
Z |
Switching to ClimoFar: Cells coming into radar range at 150-180 km to the
east. Cells were not being topped with ClimoShallow. 1900Z, Base reflectivity
|
|
1930
Z |
Begin Microphysical Scanning,
Switching to MicroFar90: Sector
centered at 80 deg to capture convection coming into range from the east. 1930Z, Base reflectivity
|
|
2035
Z |
Switching to MicroNear90: Convection is now being topped. |
|
2045
Z |
Switching to MicroNear135: Convection breaking out over the foothills. Log notes
an interesting altocumulus deck over S-Pol. Running
RHIs at 102 and 103 deg. Convection along leading
line of MCS appears to be elevated (67 dBZ core at 7 km). 2100Z, Base reflectivity |
|
2130
Z |
End Microphysical Scanning, Switching
to ClimoNear: Echo coverage is too great to focus on sectors. |
|
2205
Z |
Light
rain at S-Pol, dissipating by 2250 Z. MCS turning
right, moving N along coastal plain. 2200Z, Base reflectivity
|
|
2300
Z |
Running Profiler Scans: Leading convective line passing NOAA profiler site.
40 dBZ @ profiler. |
|
2315
Z |
Classic
MCS (asymmetric) moving N along coastal plain - trailing 40 dBZ stratiform stretched south of radar. Nice rear inflow
jet on velocity signature. 20 m/s jet between 2-3 km from
ENE behind systems. Surface divergence present at radar. 2315Z, Radial velocity
|
