Alert archive / Arizona / Flash Flood Warnings in 2018

Flash Flood Warning 127, NWS Flagstaff, AZ

August 25, 2018Yavapai County, Arizona

NWS Flagstaff, AZ issued this flash flood warning at Aug 25, 2018, 2:58 AM MST for Yavapai County, Arizona. 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: Aug 25, 2018, 2:58 AM MST (09:58 UTC)
Expired: Aug 25, 2018, 6:00 AM MST
In force: 3 hr
Issued by: NWS Flagstaff, AZ
Area: Storm-based polygon
Flood severity: None

County Yavapai County, AZ

The radar

The Flagstaff radar (KFSX), 124 km from the middle of the area, began a volume at 09:58 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

Phoenix, AZ (KPSR), launched 00:00Z, 10.0 hours before the alert went out and 141 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: 901 J/kg
Mixed-layer CIN: -32 J/kg
Mixed-layer LCL: 2164 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: 16 m²/s²
0-3 km storm-relative helicity: -3 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 Flagstaff, AZ wrote its last area forecast discussion before this flash flood warning went out at Aug 24, 8:27 PM MST, 6 hours 31 minutes earlier.

Area forecast discussion, Aug 24, 8:27 PM MST, 6 hours 31 minutes before

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In the hours before

Local storm report, Aug 24, 11:12 PM MST, 3 hours 46 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <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.
      </p>
      <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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</body>
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The office that day

Everything else NWS Flagstaff, AZ issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 24, 6:20 PM MST	Flash Flood Warning	FGZ	Gila	3 hr
Aug 24, 7:00 PM MST	Flash Flood Warning	FGZ	Yavapai	8 hr
Aug 25, 10:59 AM MST	Flash Flood Warning	FGZ	Coconino	3 hr
Aug 25, 11:39 AM MST	Flash Flood Warning	FGZ	Yavapai	3 hr
Aug 25, 12:47 PM MST	Areal Flood Advisory	FGZ	Coconino	3 hr
Aug 25, 1:38 PM MST	Flash Flood Warning	FGZ	Apache, Navajo	3 hr
Aug 25, 2:10 PM MST	Flash Flood Warning	FGZ	Yavapai	4 hr
Aug 25, 2:40 PM MST	Flash Flood Warning	FGZ	Yavapai	3 hr
Aug 25, 2:44 PM MST	Flash Flood Warning	FGZ	Yavapai	14 hr
Aug 25, 3:29 PM MST	Flash Flood Warning	FGZ	Yavapai	3 hr

Nearby

Flash Flood Warnings in Arizona, 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.