Alert archive / California / Flash Flood Watches in 2019

Flash Flood Watch 1, NWS San Diego, CA

January 13, 20194 counties in California

NWS San Diego, CA issued this flash flood watch at Jan 13, 2019, 3:00 PM PST for 4 counties in California. It took effect at Jan 14, 2019, 12:00 PM PST. It was in force for 9 hr.

The area

The counties it named.

The facts

Issued
Jan 13, 2019, 3:00 PM PST (23:00 UTC)
In effect from
Jan 14, 2019, 12:00 PM PST
Expired
Jan 14, 2019, 9:03 PM PST
In force
9 hr
Issued by
NWS San Diego, CA
Flood severity
None

Counties Orange County, CA, Riverside County, CA, San Bernardino County, CA, San Diego County, CA

The radar

The Santa Ana Mts radar (KSOX), 88 km from the middle of the area, began a volume at 23:02 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, 11.0 hours before the alert went out and 124 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.

Skew-T log-pSkew-T log-p diagram, San Diego, CA at 12:00Z on 2019-01-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, San Diego, CA at 12:00Z on 2019-01-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 9 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
722 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
9 m²/s²
0-3 km storm-relative helicity
9 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

Everything else NWS San Diego, CA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jan 12, 4:25 PM PSTSpecial Weather StatementSGXOrange50 min
Jan 12, 5:00 PM PSTSpecial Weather StatementSGXOrange45 min
Jan 13, 2:01 AM PSTSmall Craft AdvisorySGX40 hr
Jan 13, 1:51 PM PSTBeach Hazards StatementSGXOrange, San Diego4 days
Jan 13, 3:06 PM PSTWinter Storm WarningSGXRiverside, San Bernardino60 hr

Nearby

Flash Flood Watches in California, 2019Every flash flood watch in 2019

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.