Alert archive / California / Flash Flood Warnings in 2018

Flash Flood Warning 1, NWS Hanford, CA

March 13, 2018Mariposa County, Tuolumne County, California

NWS Hanford, CA issued this flash flood warning at Mar 13, 2018, 2:36 PM PDT for Mariposa County, Tuolumne County, California. It was in force for 4 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: Mar 13, 2018, 2:36 PM PDT (21:36 UTC)
Expired: Mar 13, 2018, 6:30 PM PDT
In force: 4 hr
Issued by: NWS Hanford, CA
Area: Storm-based polygon
Flood severity: None

Counties Mariposa County, CA, Tuolumne County, CA

The radar

The San Joaquin Valley radar (KHNX), 168 km from the middle of the area, began a volume at 21:36 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, 9.6 hours before the alert went out and 247 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: 1 J/kg
Mixed-layer CIN: -80 J/kg
Mixed-layer LCL: 1389 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 164 m²/s²
0-3 km storm-relative helicity: 225 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 Hanford, CA wrote its last area forecast discussion before this flash flood warning went out at Mar 13, 5:50 AM PDT, 8 hours 46 minutes earlier.

Area forecast discussion, Mar 13, 5:50 AM PDT, 8 hours 46 minutes before

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In the hours before

Special weather statement, Mar 13, 1:25 PM PDT, 1 hour 11 minutes before

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Special weather statement, Mar 13, 1:51 PM PDT, 45 minutes before

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Special weather statement, Mar 13, 2:17 PM PDT, 19 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 13, 11:11 AM PDT	Areal Flood Advisory	HNX	Madera, Mariposa, Merced, Tuolumne	3 hr
Mar 13, 1:25 PM PDT	Special Weather Statement	HNX	Merced	50 min
Mar 13, 1:51 PM PDT	Special Weather Statement	HNX	Merced	39 min
Mar 13, 2:12 PM PDT	Areal Flood Advisory	HNX	Madera, Mariposa, Merced, Tuolumne	3 hr
Mar 13, 2:17 PM PDT	Special Weather Statement	HNX	Mariposa	73 min
Mar 13, 2:52 PM PDT	Winter Storm Watch	HNX		22 hr
Mar 13, 4:18 PM PDT	Special Weather Statement	HNX	Mariposa	42 min
Mar 13, 4:52 PM PDT	Special Weather Statement	HNX	Madera, Mariposa	53 min
Mar 13, 4:59 PM PDT	Special Weather Statement	HNX		46 min

Nearby

Flash Flood Warnings in California, 2018 Every flash flood warning in 2018

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.