Alert archive / California / Areal Flood Advisories in 2021
Areal Flood Advisory 28, NWS San Diego, CA
NWS San Diego, CA issued this areal flood advisory at Jul 31, 2021, 1:30 PM PDT for San Diego County, California. It was in force for 3 hr.
The area
The counties it named.
The facts
- Issued
- Jul 31, 2021, 1:30 PM PDT (20:30 UTC)
- Expired
- Jul 31, 2021, 4:30 PM PDT
- In force
- 3 hr
- Issued by
- NWS San Diego, CA
- Area
- Storm-based polygon
County San Diego County, CA
The radar
The San Diego radar (KNKX), 28 km from the middle of the area, began a volume at 20:33 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, 8.5 hours before the alert went out and 47 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
- 2352 m above ground
- 0-6 km bulk shear
- 4 kt
- 0-1 km storm-relative helicity
- 8 m²/s²
- 0-3 km storm-relative helicity
- 26 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this areal flood advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS San Diego, CA wrote its last area forecast discussion before this areal flood advisory went out at Jul 31, 9:27 AM PDT, 4 hours 3 minutes earlier.
Area forecast discussion, Jul 31, 9:27 AM PDT, 4 hours 3 minutes before
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</html>The office that day
Everything else NWS San Diego, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 31, 12:43 PM PDT | Areal Flood Advisory | SGX | Riverside, San Bernardino | 3 hr |
| Jul 31, 1:14 PM PDT | Areal Flood Advisory | SGX | Riverside, San Diego | 5 hr |
| Jul 31, 1:39 PM PDT | Special Weather Statement | SGX | San Diego | 51 min |
| Jul 31, 2:49 PM PDT | Areal Flood Advisory | SGX | San Bernardino | 3 hr |
Nearby
Areal Flood Advisories in California, 2021Every areal flood advisory in 2021
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.