Alert archive / California / Winter Storm Warnings in 2019
Winter Storm Warning 4, NWS Phoenix, AZ
NWS Phoenix, AZ issued this winter storm warning at Dec 25, 2019, 3:03 AM PST for San Bernardino County, California. It took effect at Dec 26, 2019, 4:00 AM PST. It was in force for 25 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
- Dec 25, 2019, 3:03 AM PST (11:03 UTC)
- In effect from
- Dec 26, 2019, 4:00 AM PST
- Expired
- Dec 27, 2019, 4:58 AM PST
- In force
- 25 hr
- Issued by
- NWS Phoenix, AZ
County San Bernardino County, CA
The radar
The Edwards AFB radar (KEYX), 129 km from the middle of the area, began a volume at 11:07 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 00:00Z, 11.1 hours before the alert went out and 246 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
- 6 J/kg
- Mixed-layer CIN
- -12 J/kg
- Mixed-layer LCL
- 1048 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 15 m²/s²
- 0-3 km storm-relative helicity
- 57 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this winter storm 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 winter storm warning went out at Dec 25, 3:03 AM PST, 0 minutes earlier.
Area forecast discussion, Dec 25, 3:03 AM PST, 0 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 |
|---|---|---|---|---|
| Dec 24, 4:19 PM PST | Special Weather Statement | PSR | 41 min | |
| Dec 25, 3:04 AM PST | Flash Flood Watch | PSR | La Paz, Yuma | 42 hr |
| Dec 25, 10:30 AM PST | Areal Flood Warning | PSR | Gila | 36 hr |
| Dec 25, 10:43 AM PST | Special Weather Statement | PSR | Pinal | 47 min |
Nearby
Winter Storm Warnings in California, 2019Every winter storm warning 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.