Alert archive / California / Flash Flood Warnings in 2017
Flash Flood Warning 5, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this flash flood warning at Jan 4, 2017, 3:30 PM PST for Santa Clara County, California. It was in force for 2 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, 3:30 PM PST (23:30 UTC)
- Expired
- Jan 4, 2017, 5:30 PM PST
- In force
- 2 hr
- Issued by
- NWS San Francisco Bay Area, CA
- Area
- Storm-based polygon
- Flood severity
- None
County Santa Clara County, CA
The radar
The San Francisco radar (KMUX), 35 km from the middle of the area, began a volume at 23:32 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 12:00Z, 11.5 hours before the alert went out and 100 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
- 3 J/kg
- Mixed-layer CIN
- -26 J/kg
- Mixed-layer LCL
- 513 m above ground
- 0-6 km bulk shear
- 74 kt
- 0-1 km storm-relative helicity
- 166 m²/s²
- 0-3 km storm-relative helicity
- 200 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted.
045 WGUS56 KMTR 042330 FFWMTR CAC085-050130- /O.NEW.KMTR.FF.W.0005.170104T2330Z-170105T0130Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED Flash Flood Warning National Weather Service San Francisco CA 330 PM PST WED JAN 4 2017 The National Weather Service in The San Francisco Bay Area has issued a * Flash Flood Warning for... Southeastern Santa Clara County in northern California... * Until 530 PM PST * At 328 PM PST, the public media reported flash flooding of Uvas Creek overflowing near Christmas Hill Park. Flash flooding is already occurring. PRECAUTIONARY/PREPAREDNESS ACTIONS... Turn around, don't drown when encountering flooded roads. Most flood deaths occur in vehicles. && LAT...LON 3696 12156 3699 12160 3701 12158 3698 12154 $$ WP
1 follow-up statement
852 WGUS76 KMTR 050127 FFSMTR Flash Flood Statement National Weather Service San Francisco CA 527 PM PST WED JAN 4 2017 CAC085-050130- /O.EXP.KMTR.FF.W.0005.000000T0000Z-170105T0130Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Santa Clara CA- 527 PM PST WED JAN 4 2017 ...THE FLASH FLOOD WARNING FOR SOUTHEASTERN SANTA CLARA COUNTY WILL EXPIRE AT 530 PM PST... The flash flood warning will be allowed to expire. However due to periodic releases of water from Uvas Reservoir...flooding of Uvas Creek near Christmas Hill Park is still likely to continue. Road closures are in place at the impacted area. Please continue to heed any road closures. LAT...LON 3696 12156 3699 12160 3701 12158 3698 12154 $$ WP
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, 1:08 AM PST | Flash Flood Warning | MTR | Santa Cruz | 3 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 |
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.