Alert archive / California / Excessive Heat Warnings in 2020
Excessive Heat Warning 13, NWS Phoenix, AZ
NWS Phoenix, AZ issued this excessive heat warning at Aug 28, 2020, 1:48 AM MST for Yuma County, Arizona; Imperial County, Riverside County, California. It took effect at Aug 28, 2020, 10:00 AM MST. It was in force for 10 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Aug 28, 2020, 1:48 AM MST (08:48 UTC)
- In effect from
- Aug 28, 2020, 10:00 AM MST
- Expired
- Aug 28, 2020, 8:00 PM MST
- In force
- 10 hr
- Issued by
- NWS Phoenix, AZ
Counties Yuma County, AZ, Imperial County, CA, Riverside County, CA
The radar
The Yuma radar (KYUX), 87 km from the middle of the area, began a volume at 08:49 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
Phoenix, AZ (KPSR), launched 00:00Z, 8.8 hours before the alert went out and 291 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
- 78 J/kg
- Mixed-layer CIN
- -70 J/kg
- Mixed-layer LCL
- 4177 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- -25 m²/s²
- 0-3 km storm-relative helicity
- -7 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this excessive heat warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Phoenix, AZ wrote its last area forecast discussion before this excessive heat warning went out at Aug 27, 10:50 PM MST, 2 hours 58 minutes earlier.
Area forecast discussion, Aug 27, 10:50 PM MST, 2 hours 58 minutes before
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</html>The office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 27, 5:06 PM MST | Special Weather Statement | PSR | Gila | 39 min |
| Aug 27, 5:08 PM MST | Special Weather Statement | PSR | Gila | 52 min |
| Aug 27, 5:47 PM MST | Areal Flood Advisory | PSR | Gila, Maricopa | 3 hr |
| Aug 27, 5:49 PM MST | Special Weather Statement | PSR | Gila | 41 min |
| Aug 27, 6:16 PM MST | Flash Flood Warning | PSR | Gila | 4 hr |
| Aug 28, 1:24 PM MST | Flash Flood Watch | PSR | Gila, La Paz, Maricopa, Pinal | 58 hr |
Nearby
Excessive Heat Warnings in California, 2020Excessive Heat Warnings in Arizona, 2020Every excessive heat warning in 2020
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.