Alert archive / Utah / Flash Flood Warnings in 2022

Flash Flood Warning 46, NWS Grand Junction, CO

August 15, 2022Grand County, Utah

NWS Grand Junction, CO issued this flash flood warning at Aug 15, 2022, 5:55 PM MDT for Grand 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
Aug 15, 2022, 5:55 PM MDT (23:55 UTC)
Expired
Aug 15, 2022, 8:47 PM MDT
In force
3 hr
Issued by
NWS Grand Junction, CO
Area
Storm-based polygon
Flood severity
None

County Grand County, UT

The radar

The Grand Junction radar (KGJX), 118 km from the middle of the area, began a volume at 23:58 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

Grand Junction, CO (KGJT), launched 12:00Z, 11.9 hours before the alert went out and 94 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-pSkew-T log-p diagram, Grand Junction, CO at 12:00Z on 2022-08-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 17 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Grand Junction, CO at 12:00Z on 2022-08-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -44 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
17 J/kg
Mixed-layer CIN
-206 J/kg
Mixed-layer LCL
1423 m above ground
0-6 km bulk shear
5 kt
0-1 km storm-relative helicity
-44 m²/s²
0-3 km storm-relative helicity
-63 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 Aug 15, 5:38 PM MDT, 17 minutes earlier.

Area forecast discussion, Aug 15, 5:38 PM MDT, 17 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.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>
Hazardous weather outlook, Aug 15, 4:24 AM MDT, 13 hours 31 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.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

In the hours before

Special weather statement, Aug 15, 12:29 PM MDT, 5 hours 26 minutes before
Special Weather Statement
National Weather Service Grand Junction CO
1229 PM MDT Mon Aug 15 2022

COZ009-151900-
Grand and Battlement Mesas CO-
1229 PM MDT Mon Aug 15 2022

...A couple of strong thunderstorms will impact portions of
northeastern Mesa County through 100 PM MDT...

At 1225 PM MDT, Doppler radar was tracking two strong thunderstorms
10 to 13 miles southeast of Collbran, or 32 to 36 miles southwest of
Glenwood Springs. These storm are nearly stationary.

HAZARD...Winds in excess of 30 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

This storm will remain over mainly rural areas of northeastern Mesa
County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with these storms and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3906 10775 3910 10795 3934 10780 3920 10755
TIME...MOT...LOC 1825Z 216DEG 4KT 3916 10776

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...30 MPH

DB
Special weather statement, Aug 15, 1:40 PM MDT, 4 hours 15 minutes before
Special Weather Statement
National Weather Service Grand Junction CO
140 PM MDT Mon Aug 15 2022

COZ017-152015-
Uncompahgre Plateau/Dallas Divide CO-
140 PM MDT Mon Aug 15 2022

...Strong thunderstorms will impact portions of southwestern Mesa
County through 215 PM MDT...

At 140 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from 20 miles south of Grand Junction to 26 miles
west of Delta. Movement was east at 10 mph.

HAZARD...Winds in excess of 40 mph and half inch hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

These storms will remain over mainly rural areas of southwestern Mesa
County.

This includes Colorado 141 between mile markers 133 and 138.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with these storms and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3882 10856 3862 10838 3864 10856 3883 10873
TIME...MOT...LOC 1940Z 283DEG 10KT 3880 10864 3871 10855

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...40 MPH

BGB
Local storm report, Aug 15, 3:03 PM MDT, 2 hours 52 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.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>
Local storm report, Aug 15, 4:45 PM MDT, 1 hour 10 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.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 14, 6:04 PM MDTSpecial Weather StatementGJTGarfield26 min
Aug 14, 6:10 PM MDTSpecial Weather StatementGJTSan Miguel35 min
Aug 14, 6:24 PM MDTFlash Flood WarningGJTGarfield, Mesa3 hr
Aug 14, 6:59 PM MDTSpecial Weather StatementGJTRio Blanco31 min
Aug 14, 7:38 PM MDTSpecial Weather StatementGJTEagle37 min
Aug 14, 7:50 PM MDTAreal Flood AdvisoryGJTMontrose, Ouray3 hr
Aug 14, 8:42 PM MDTFlash Flood WatchGJTEagle, Garfield, Moffat, Pitkin, Rio Blanco, Routt3 hr
Aug 15, 3:18 AM MDTFlash Flood WatchGJTEagle, Garfield, Moffat, Pitkin, Rio Blanco, Routt14 hr
Aug 15, 10:35 AM MDTFlood WatchGJTDolores, Mesa, Montezuma, Montrose, San Miguel11 hr
Aug 15, 12:29 PM MDTSpecial Weather StatementGJTDelta31 min
Aug 15, 1:40 PM MDTSpecial Weather StatementGJTMesa35 min
Aug 15, 1:59 PM MDTAreal Flood AdvisoryGJTGarfield, Mesa3 hr
Aug 15, 2:01 PM MDTAreal Flood AdvisoryGJTMesa3 hr
Aug 15, 2:05 PM MDTFlash Flood Warning Considerable damage threatGJTGarfield, Mesa102 min
Aug 15, 2:34 PM MDTAreal Flood AdvisoryGJTGarfield, Mesa3 hr
Aug 15, 2:58 PM MDTAreal Flood AdvisoryGJTMontezuma25 min
Aug 15, 3:24 PM MDTFlash Flood Warning Considerable damage threatGJTMontezuma3 hr
Aug 15, 4:32 PM MDTAreal Flood AdvisoryGJTGunnison, Pitkin55 min
Aug 15, 5:03 PM MDTFlash Flood Warning Considerable damage threatGJTEagle, Garfield3 hr
Aug 15, 5:11 PM MDTFlash Flood Warning Considerable damage threatGJTEagle, Garfield, Pitkin2 hr
Aug 15, 5:20 PM MDTFlash Flood WarningGJTGarfield, Gunnison, Pitkin3 hr
Aug 14, 6:02 PM MDTAreal Flood AdvisoryGJTSan Juan3 hr
Aug 15, 3:51 PM MDTAreal Flood AdvisoryGJTSan Juan3 hr
Aug 15, 4:26 PM MDTAreal Flood AdvisoryGJTGrand3 hr
Aug 15, 5:34 PM MDTFlash Flood Warning Considerable damage threatGJTGrand, San Juan4 hr

Nearby

Flash Flood Warnings in Utah, 2022Every flash flood warning in 2022

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.