Alert archive / California / Flash Flood Warnings in 2017
Flash Flood Warning 1, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this flash flood warning at Jan 4, 2017, 1:08 AM PST for Santa Cruz County, California. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jan 4, 2017, 1:08 AM PST (09:08 UTC)
- Expired
- Jan 4, 2017, 4:00 AM PST
- In force
- 3 hr
- Issued by
- NWS San Francisco Bay Area, CA
- Area
- Storm-based polygon
- Flood severity
- None
County Santa Cruz County, CA
The radar
The San Francisco radar (KMUX), 20 km from the middle of the area, began a volume at 09:10 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
Oakland, CA (KOAK), launched 00:00Z, 9.1 hours before the alert went out and 78 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
- 707 m above ground
- 0-6 km bulk shear
- 56 kt
- 0-1 km storm-relative helicity
- 335 m²/s²
- 0-3 km storm-relative helicity
- 696 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
208 WGUS56 KMTR 040908 FFWMTR CAC087-041200- /O.NEW.KMTR.FF.W.0001.170104T0908Z-170104T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED Flash Flood Warning National Weather Service San Francisco CA 108 AM PST WED JAN 4 2017 The National Weather Service in The San Francisco Bay Area has issued a * Flash Flood Warning for... Central Santa Cruz County in northern California... * Until 400 AM PST * At 106 AM PST, Doppler radar indicated rain continuing across the warned area. The San Lorenzo River gauge at Big Trees has been rapidly rising and is quickly nearing flash flood levels. Flash flooding is expected to begin shortly. * Some locations that will likely experience flooding include... Scotts Valley and Felton. PRECAUTIONARY/PREPAREDNESS ACTIONS... Be especially cautious at night when it is harder to recognize the dangers of flooding. && LAT...LON 3701 12206 3704 12210 3707 12207 3704 12203 $$
1 follow-up statement
687 WGUS76 KMTR 041047 FFSMTR Flash Flood Statement National Weather Service San Francisco CA 247 AM PST WED JAN 4 2017 CAC087-041200- /O.CON.KMTR.FF.W.0001.000000T0000Z-170104T1200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Santa Cruz CA- 247 AM PST WED JAN 4 2017 ...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 400 AM PST FOR CENTRAL SANTA CRUZ COUNTY... At 244 AM PST, Doppler radar indicated rain continuing across the San Lorenzo River at Big Trees with additional rainfall likely. In addition, the gauge has gone over flood stage several times over the past two hours. Some locations that will may flooding include... Scotts Valley and Felton. PRECAUTIONARY/PREPAREDNESS ACTIONS... Be especially cautious at night when it is harder to recognize the dangers of flooding. && LAT...LON 3701 12206 3704 12210 3707 12207 3704 12203 $$
The office that day
Everything else NWS San Francisco Bay Area, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 3, 5:31 PM PST | Areal Flood Warning | MTR | Alameda, Contra Costa, Marin, Monterey, Napa, San Benito and 5 more | 6 hr |
| Jan 3, 5:43 PM PST | Areal Flood Advisory | MTR | Alameda, Contra Costa, Marin, Monterey, Napa, San Benito and 5 more | 12 hr |
| Jan 4, 2:35 AM PST | Small Craft Advisory | MTR | 6 hr | |
| Jan 4, 3:41 AM PST | Flash Flood Warning | MTR | Sonoma | 4 hr |
| Jan 4, 3:53 AM PST | Flash Flood Warning | MTR | Santa Cruz | 3 hr |
| Jan 4, 4:40 AM PST | Flash Flood Warning | MTR | Monterey | 6 hr |
| Jan 4, 3:30 PM PST | Flash Flood Warning | MTR | Santa Clara | 2 hr |
Nearby
Flash Flood Warnings in California, 2017Every flash flood warning in 2017
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.