Alert archive / Utah / Flash Flood Warnings in 2018

Flash Flood Warning 11, NWS Grand Junction, CO

July 14, 2018San Juan County, Utah

NWS Grand Junction, CO issued this flash flood warning at Jul 14, 2018, 7:05 PM MDT for San Juan County, Utah. 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: Jul 14, 2018, 7:05 PM MDT (01:05 UTC)
Expired: Jul 14, 2018, 10:00 PM MDT
In force: 3 hr
Issued by: NWS Grand Junction, CO
Area: Storm-based polygon
Flood severity: None

County San Juan County, UT

The radar

The Grand Junction radar (KGJX), 212 km from the middle of the area, began a volume at 01:05 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

Flgstf/Belemont, AZ (KFGZ), launched 00:00Z, 1.1 hours before the alert went out and 321 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: 88 J/kg
Mixed-layer CIN: -68 J/kg
Mixed-layer LCL: 1100 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 21 m²/s²
0-3 km storm-relative helicity: 104 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 Grand Junction, CO wrote its last area forecast discussion before this flash flood warning went out at Jul 14, 5:36 PM MDT, 1 hour 29 minutes earlier.

Area forecast discussion, Jul 14, 5:36 PM MDT, 1 hour 29 minutes before

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Hazardous weather outlook, Jul 14, 3:19 PM MDT, 3 hours 46 minutes before

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</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>
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        Please try again in a few minutes.
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The office that day

Everything else NWS Grand Junction, CO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 15, 11:46 AM MDT	Flash Flood Warning	GJT	La Plata	119 min
Jul 15, 1:50 PM MDT	Flash Flood Warning	GJT	San Miguel	115 min
Jul 15, 2:09 PM MDT	Flash Flood Warning	GJT	Montrose, Ouray, San Miguel	3 hr
Jul 15, 3:03 PM MDT	Flash Flood Watch	GJT	Archuleta, Dolores, Hinsdale, La Plata, Montezuma, San Juan and 1 more	30 hr
Jul 14, 8:27 PM MDT	Flash Flood Warning	GJT	San Juan	3 hr

Nearby

Flash Flood Warnings in Utah, 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.