Alert archive / California / Flash Flood Watches in 2017
Flash Flood Watch 6, NWS Los Angeles, CA
NWS Los Angeles, CA issued this flash flood watch at Jan 21, 2017, 11:17 AM PST for Los Angeles County, Santa Barbara County, California. It took effect at Jan 22, 2017, 3:00 AM PST. It was in force for 39 hr.
The area
The counties it named.
The facts
- Issued
- Jan 21, 2017, 11:17 AM PST (19:17 UTC)
- In effect from
- Jan 22, 2017, 3:00 AM PST
- Expired
- Jan 23, 2017, 6:00 PM PST
- In force
- 39 hr
- Issued by
- NWS Los Angeles, CA
- Flood severity
- None
The radar
The Los Angeles radar (KVTX), 6 km from the middle of the area, began a volume at 19:18 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Vandenberg AFB, CA (KVBG), launched 12:00Z, 7.3 hours before the alert went out and 130 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 20 J/kg
- Mixed-layer CIN
- -12 J/kg
- Mixed-layer LCL
- 968 m above ground
- 0-6 km bulk shear
- 144 kt
- 0-1 km storm-relative helicity
- 124 m²/s²
- 0-3 km storm-relative helicity
- 176 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this flash flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Los Angeles, CA wrote its last area forecast discussion before this flash flood watch went out at Jan 21, 11:07 AM PST, 10 minutes earlier.
Area forecast discussion, Jan 21, 11:07 AM PST, 10 minutes before
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</html>In the hours before
Local storm report, Jan 21, 8:02 AM PST, 3 hours 15 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OXNARD CA
802 AM PST SAT JAN 21 2017
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0700 AM HIGH SURF VENTURA 34.27N 119.26W
01/21/2017 VENTURA CA LAW ENFORCEMENT
VENTURA HARBOR REPORTED SURF OF 16 FEET NEAR THE HARBOR
ENTRANCE.
&&
KITTELLThe office that day
Everything else NWS Los Angeles, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 20, 8:35 PM PST | Small Craft Advisory | LOX | 33 hr | |
| Jan 20, 8:35 PM PST | Small Craft Advisory for Hazardous Seas | LOX | 6 hr | |
| Jan 21, 2:33 AM PST | Gale Watch | LOX | 12 hr | |
| Jan 21, 2:33 AM PST | Gale Warning | LOX | 39 hr | |
| Jan 21, 9:41 AM PST | High Wind Warning | LOX | 40 hr | |
| Jan 21, 9:41 AM PST | Wind Advisory | LOX | Los Angeles, Santa Barbara | 40 hr |
| Jan 21, 9:58 AM PST | Winter Storm Warning | LOX | 56 hr |
Nearby
Flash Flood Watches in California, 2017Every flash flood watch in 2017
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.