Alert archive / California / Heat Advisories in 2018
Heat Advisory 4, NWS San Diego, CA
NWS San Diego, CA issued this heat advisory at Jul 20, 2018, 12:51 PM PDT for Orange County, San Diego County, California. It took effect at Jul 23, 2018, 10:00 AM PDT. It was in force for 66 hr.
The area
The counties it named.
The facts
- Issued
- Jul 20, 2018, 12:51 PM PDT (19:51 UTC)
- In effect from
- Jul 23, 2018, 10:00 AM PDT
- Expired
- Jul 26, 2018, 3:37 AM PDT
- In force
- 66 hr
- Issued by
- NWS San Diego, CA
Counties Orange County, CA, San Diego County, CA
The radar
The San Diego radar (KNKX), 53 km from the middle of the area, began a volume at 19:53 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, 7.9 hours before the alert went out and 62 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
- 963 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 17 m²/s²
- 0-3 km storm-relative helicity
- 149 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.7
What forecasters said that day
The local office's own words before this heat 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 heat advisory went out at Jul 20, 9:45 AM PDT, 3 hours 6 minutes earlier.
Area forecast discussion, Jul 20, 9:45 AM PDT, 3 hours 6 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 20, 2:13 AM PDT | Excessive Heat Warning | SGX | Orange, Riverside, San Bernardino, San Diego | 9 days |
| Jul 20, 2:35 PM PDT | Flash Flood Warning | SGX | San Bernardino | 85 min |
Nearby
Heat Advisories in California, 2018Every heat advisory 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.