Alert archive / California / Flood Watches in 2019
Flood Watch 1, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this flood watch at Feb 24, 2019, 4:10 AM PST for Marin County, Napa County, Sonoma County, California. It took effect at Feb 25, 2019, 12:00 PM PST. It was in force for 50 hr.
The area
The counties it named.
The facts
- Issued
- Feb 24, 2019, 4:10 AM PST (12:10 UTC)
- In effect from
- Feb 25, 2019, 12:00 PM PST
- Expired
- Feb 27, 2019, 1:59 PM PST
- In force
- 50 hr
- Issued by
- NWS San Francisco Bay Area, CA
- Flood severity
- None
Counties Marin County, CA, Napa County, CA, Sonoma County, CA
The radar
The Sacramento radar (KDAX), 88 km from the middle of the area, began a volume at 12:10 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
Reno, NV (KREV), launched 12:00Z, 0.2 hours before the alert went out and 409 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
- 1600 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 222 m²/s²
- 0-3 km storm-relative helicity
- 317 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS San Francisco Bay Area, CA wrote its last area forecast discussion before this flood watch went out at Feb 24, 3:54 AM PST, 16 minutes earlier.
Area forecast discussion, Feb 24, 3:54 AM PST, 16 minutes before
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</html>The office that day
Everything else NWS San Francisco Bay Area, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 23, 7:27 PM PST | Small Craft Advisory | MTR | 68 hr | |
| Feb 24, 1:38 PM PST | Flash Flood Watch | MTR | Alameda, Contra Costa, City and County of San Francisco, San Mateo, Santa Clara, Santa Cruz | 61 hr |
| Feb 24, 1:56 PM PST | Gale Watch | MTR | 12 hr |
Nearby
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.