Alert archive / California / Flash Flood Warnings in 2019

Flash Flood Warning 1, NWS Sacramento, CA

January 17, 2019Butte County, California

NWS Sacramento, CA issued this flash flood warning at Jan 17, 2019, 8:11 AM PST for Butte 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 counties it named.

The facts

Issued: Jan 17, 2019, 8:11 AM PST (16:11 UTC)
Expired: Jan 17, 2019, 11:15 AM PST
In force: 3 hr
Issued by: NWS Sacramento, CA
Area: Storm-based polygon
Flood severity: None

County Butte County, CA

The radar

The Beale AFB radar (KBBX), 19 km from the middle of the area, began a volume at 16:15 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

Medford/Jackson, OR (KMFR), launched 12:00Z, 4.2 hours before the alert went out and 317 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 6 J/kg
Mixed-layer CIN: -44 J/kg
Mixed-layer LCL: 968 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 123 m²/s²
0-3 km storm-relative helicity: 368 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Sacramento, CA wrote its last area forecast discussion before this flash flood warning went out at Jan 17, 4:36 AM PST, 3 hours 35 minutes earlier.

Area forecast discussion, Jan 17, 4:36 AM PST, 3 hours 35 minutes before

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In the hours before

Local storm report, Jan 17, 3:12 AM PST, 4 hours 59 minutes before

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Local storm report, Jan 17, 5:44 AM PST, 2 hours 27 minutes before

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Local storm report, Jan 17, 5:48 AM PST, 2 hours 23 minutes before

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Local storm report, Jan 17, 5:52 AM PST, 2 hours 19 minutes before

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Local storm report, Jan 17, 5:59 AM PST, 2 hours 12 minutes before

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Local storm report, Jan 17, 6:04 AM PST, 2 hours 7 minutes before

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The office that day

Everything else NWS Sacramento, CA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jan 16, 5:16 PM PST	Areal Flood Advisory	STO	Butte, Colusa, Glenn, Lake, Shasta, Sutter and 3 more	12 hr
Jan 16, 7:15 PM PST	Areal Flood Advisory	STO	Amador, Calaveras, El Dorado, Nevada, Placer, Sacramento and 7 more	10 hr
Jan 16, 11:22 PM PST	Special Weather Statement	STO	Amador, Calaveras, El Dorado	53 min
Jan 17, 12:17 AM PST	Special Weather Statement	STO	Calaveras	58 min
Jan 17, 1:24 AM PST	Special Weather Statement	STO	Tuolumne	21 min
Jan 17, 1:32 AM PST	River Flood Warning	STO	Tehama	28 hr
Jan 17, 1:45 AM PST	Wind Advisory	STO		8 hr
Jan 17, 2:50 AM PST	Flash Flood Watch	STO		13 hr

Nearby

Flash Flood Warnings in California, 2019 Every flash flood 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.