CASE 10 - Quasi-linear
MCS over SMO, developed MCV
Microphysical scans 0100 - 0415 Z, 3h
15m
(System lifetime: 2200 - 0330 Z)
SYNOPTIC CONDITIONS SUMMARY:
Synoptic
feature map -
IOP
status - IOP #3 in effect (see
report). This IOP (0Z
7/20-0Z 7/23) captured the breakdown of a monsoon ridge over the domain,
along with several wind surges over the GOC including a major Gulf Surge
(GS#2). The outflow from this MCS/MCV event was believed to initiate a weak
gulf surge in the northern GOC. Most
prominent convective activity during this time over the SMO, preceding
IV#6. Strong
250mb jet extending from
Day
0 forecast discussion text
Winds
200
mb - model.ETA.200407210000.00_200mb_wnd.gif
500
mb - model.ETA.200407210000.00_500mb_wnd.gif
700
mb - model.ETA.200407210000.00_700mb_wnd.gif
850
mb - model.ETA.200407210000.00_850mb_wnd.gif
EVENT SUMMARY: A quasi-linear MCS developed over the SMO between 20-22 Z on 7/20. This
MCS moved off the SMO toward the GOC during the observation period, and
dissipated shortly thereafter. NOTE: The GOES-10 satellite imagery is missing
from 7/20 18Z - 7/21 10Z, making it difficult to describe overall development
of system.
0100Z, Base reflectivity
24
h precipitation totals -
S-POL SUMMARY: Scattered intense cells, associated with developing MCS, move through
S-Pol domain. Storm motion during this time period
was easterly (as are 500mb
winds).
S-Pol log - spol_072104.txt
SCAN
OVERVIEW:
|
2000
(7/20) - 0100 Z |
Scattered
intense cells, presumable associated with developing MCS, developed E of S-Pol over the SMO. 2300 Z, Base reflectivity.
|
|
2315
Z |
A
cell 80 km to the N-NE of S-Pol had 50-55 dBZ and R-Kdp rainrates of 100 mm/hr. |
|
0100
Z |
Switched to MicroNear135: Sector centered on 120 deg. Prompted by a
particularly intense (63 dBZ) echo that formed just
E of S-Pol, moving westward. This cell exhibited
good low-level convergence, good upper-level divergence, and frequent
lightning (rumbling of thunder noted in S-Pol log). 0107Z, dBZ
Sector of intense convective activity within MCS over SMO
0107Z, dBZ
Cross Section through intense cells to east - Corresponds to yellow line drawn on PPI sector above. dBZ in core > 60.
|
|
0345
Z |
Echo
intensities have weakened substantially and stratiform precip
dominate S-Pol domain. 0345 Z, Base reflectivity.
|
|
0400
Z |
End Microphysical Scanning, Switch to
ClimoNear:
|
