Alert archive / California / Flash Flood Warnings in 2023

Flash Flood Warning 49, NWS Hanford, CA

August 20, 2023Kern County, Tulare County, California

NWS Hanford, CA issued this flash flood warning at Aug 20, 2023, 4:02 PM PDT for Kern County, Tulare County, California. It was in force for 9 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: Aug 20, 2023, 4:02 PM PDT (23:02 UTC)
Expired: Aug 21, 2023, 12:32 AM PDT
In force: 9 hr
Issued by: NWS Hanford, CA
Area: Storm-based polygon
Flood severity: None

Counties Kern County, CA, Tulare County, CA

The radar

The San Joaquin Valley radar (KHNX), 98 km from the middle of the area, began a volume at 23:03 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

Las Vegas, NV (KVEF), launched 12:00Z, 11.0 hours before the alert went out and 297 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 563 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 147 m²/s²
0-3 km storm-relative helicity: 186 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 Aug 20, 1:51 PM PDT, 2 hours 11 minutes earlier.

Area forecast discussion, Aug 20, 1:51 PM PDT, 2 hours 11 minutes before

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In the hours before

Local storm report, Aug 20, 12:22 PM PDT, 3 hours 40 minutes before

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Local storm report, Aug 20, 1:10 PM PDT, 2 hours 52 minutes before

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Local storm report, Aug 20, 1:11 PM PDT, 2 hours 51 minutes before

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      <h1 id="headline">This service is currently unavailable.</h1>
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Local storm report, Aug 20, 2:46 PM PDT, 1 hour 16 minutes before

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Local storm report, Aug 20, 3:37 PM PDT, 25 minutes before

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      <p id="message2">
        Please try again in a few minutes.
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        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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Local storm report, Aug 20, 3:47 PM PDT, 15 minutes before

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<body>
  <main class="wrap">
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      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
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      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 19, 5:05 PM PDT	Special Weather Statement	HNX	Kings	40 min
Aug 19, 5:16 PM PDT	Special Weather Statement	HNX	Kings	44 min
Aug 19, 5:27 PM PDT	Special Weather Statement	HNX	Kings	48 min
Aug 19, 5:49 PM PDT	Wind Advisory	HNX	Kern, Tulare	3 hr
Aug 19, 6:01 PM PDT	Special Weather Statement	HNX	Kings	44 min
Aug 19, 6:13 PM PDT	Special Weather Statement	HNX		47 min
Aug 19, 6:15 PM PDT	Special Weather Statement	HNX		45 min
Aug 19, 7:05 PM PDT	Special Weather Statement	HNX	Fresno	40 min
Aug 19, 7:07 PM PDT	Special Weather Statement	HNX	Kings	38 min
Aug 20, 12:43 AM PDT	High Wind Warning	HNX	Kern	26 hr
Aug 20, 11:52 AM PDT	Areal Flood Advisory	HNX	Kern, Tulare	13 hr
Aug 20, 12:02 PM PDT	Flash Flood Warning	HNX	Kern	3 hr
Aug 20, 12:03 PM PDT	Flash Flood Warning Considerable damage threat	HNX	Kern	5 hr
Aug 20, 12:08 PM PDT	Areal Flood Advisory	HNX	Kern	5 hr
Aug 20, 2:05 PM PDT	Areal Flood Advisory	HNX	Kern	4 hr
Aug 20, 2:16 PM PDT	Flash Flood Warning	HNX	Kern	3 hr
Aug 20, 2:25 PM PDT	Areal Flood Advisory	HNX	Kern	3 hr
Aug 20, 2:35 PM PDT	Flash Flood Warning Considerable damage threat	HNX	Kern	8 hr
Aug 20, 3:21 PM PDT	Flash Flood Warning Considerable damage threat	HNX	Kern	2 hr
Aug 20, 3:23 PM PDT	Areal Flood Advisory	HNX	Kern, Tulare	3 hr
Aug 20, 3:36 PM PDT	Flash Flood Warning Considerable damage threat	HNX	Kern	114 min
Aug 20, 4:04 PM PDT	Flash Flood Warning Considerable damage threat	HNX	Kern	8 hr

Nearby

Flash Flood Warnings in California, 2023 Every flash flood warning in 2023

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.