Debris Flow-06/07 Event
Log
IOP-4
Lat: 34.66030 N Lon:
-118.7640 W Alt:
814 m Truck
HD: 91 deg
Date/Time SR1 ready for operation: 2/10/07 1700 UTC
Note taker: JJ Gourley (NSSL)
|
Time (UTC) |
Event |
|
1630 |
Arrived on site – leveled truck, booted computer
– all OK |
|
1701 |
Began data collection- very light cloud echoes visible to
the N of the basin and also some more substantial echoes (35 dBZ) to the S-SE
of the burn area. Forecast calls
for widespread rainfall beginning around 2000 UTC with the possibility of
> 2Ó of rain. Flash flood
watches have been issued for the 2005 and 2006 burn areas to the W of
here. Forecast discussion
indicates watches may be warranted for this region later in the
afternoon. |
|
1753 |
No precipitating echoes over basin. After talking with Dave and reading
latest forecast discussion have decided to stop data collection until later
this afternoon. Will monitor
KVTX from hotel room and return when more substantial echoes move in. |
|
0105 |
Came back on site.
Ran one volume scan without releveling or resetting clock to determine
if data collection needs to commence. Only very weak echoes (< 10 dBZ) are
evident over basin. Have decided
to shut radar down again and check it in an hour or so. |
|
0226 |
Started up radar againÉnot properly leveled yet and time
is not correct. IŐll fine-tune
these when I see some legitimate echoes. No precipitating echoes over basin yet. Some very light echoes (10 dBZ)
visible to the S, but thatŐs it.
Will shut down radar again and wait. |
|
0551 |
Data acquisition has begun. Radar is leveled and time is set properly. 35 dBZ echoes now visible in a
circular region around radar over burn area. Radius of circle decreases with elevation angle suggesting
a horizontally homogeneous cloud layer.
Virga is suspected and was visually observed a few hours ago. No precipitation is reaching the
ground yet. |
|
0603 |
Light precipitation has just begun at radar site. |
|
0642 |
No rain at radar site. Large region of 35-40 dBZ echoes persist to the NW of
radar, N of the burn area.
Scattered 30-35 dBZ echoes over burn area. May still be virga. |
|
0722 |
Moderate rain falling. 40-45 dBZ echoes in E portion of basin. Melting layer evident at 12.5 deg
elevation. |
|
0738 |
Rain has stopped.
No echoes over burn area.
Clear skies overhead. |
|
0942 |
Region remains free of precipitating echoes. |
|
1018 |
30-35 dBZ echoes over center of basin. Very light rain at radar site. |
|
1047 |
40 dBZ echoes in E half of basin. Moderate rain at radar site. |
|
1139 |
Releveled radar and will leave unattended for a few hours. |
|
1948 |
Stopped data acquisition. Believe event ended around 1400 UTCÉbased on file sizes. |
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