Alert archive / California / Flash Flood Watches in 2018
Flash Flood Watch 4, NWS Los Angeles, CA
NWS Los Angeles, CA issued this flash flood watch at Mar 19, 2018, 3:23 PM PDT for Los Angeles County, California. It took effect at Mar 20, 2018, 5:00 PM PDT. It was in force for 56 hr.
The area
The counties it named.
The facts
- Issued
- Mar 19, 2018, 3:23 PM PDT (22:23 UTC)
- In effect from
- Mar 20, 2018, 5:00 PM PDT
- Expired
- Mar 23, 2018, 12:59 AM PDT
- In force
- 56 hr
- Issued by
- NWS Los Angeles, CA
- Flood severity
- None
County Los Angeles County, CA
The radar
The Santa Ana Mts radar (KSOX), 71 km from the middle of the area, began a volume at 22:21 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
San Diego, CA (KNKX), launched 12:00Z, 10.4 hours before the alert went out and 184 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1444 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 5 m²/s²
- 0-3 km storm-relative helicity
- 73 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
Nearby
Flash Flood Watches in California, 2018Every flash flood watch in 2018
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.