Alert archive / Colorado / Special Weather Statements in 2015

Special Weather Statement, NWS Grand Junction, CO

August 4, 2015Delta County, Colorado

NWS Grand Junction, CO issued this special weather statement at Aug 4, 2015, 12:13 AM MDT for Delta County, Colorado. It was in force for 47 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Aug 4, 2015, 12:13 AM MDT (06:13 UTC)
Expired
Aug 4, 2015, 1:00 AM MDT
In force
47 min
Issued by
NWS Grand Junction, CO

County Delta County, CO

The radar

The Grand Junction radar (KGJX), 45 km from the middle of the area, began a volume at 06:16 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 00:00Z, 6.2 hours before the alert went out and 69 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 00:00Z on 2015-08-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 192 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 00:00Z on 2015-08-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 8 square meters per square second.193958Sfc1 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
192 J/kg
Mixed-layer CIN
-7 J/kg
Mixed-layer LCL
2815 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
8 m²/s²
0-3 km storm-relative helicity
35 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Aug 3, 5:38 PM MDT, 6 hours 35 minutes earlier.

Area forecast discussion, Aug 3, 5:38 PM MDT, 6 hours 35 minutes before
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  <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>
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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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Hazardous weather outlook, Aug 3, 5:30 AM MDT, 18 hours 43 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GRAND JUNCTION CO
530 AM MDT MON AUG 3 2015

COZ001>014-017>023-UTZ022>025-027>029-041130-
LOWER YAMPA RIVER BASIN-CENTRAL YAMPA RIVER BASIN-
ROAN AND TAVAPUTS PLATEAUS-ELKHEAD AND PARK MOUNTAINS-
UPPER YAMPA RIVER BASIN-GRAND VALLEY-DEBEQUE TO SILT CORRIDOR-
CENTRAL COLORADO RIVER BASIN-GRAND AND BATTLEMENT MESAS-
GORE AND ELK MOUNTAINS/CENTRAL MOUNTAIN VALLEYS-
CENTRAL GUNNISON AND UNCOMPAHGRE RIVER BASIN-
WEST ELK AND SAWATCH MOUNTAINS-FLATTOPS-
UPPER GUNNISON RIVER VALLEY-UNCOMPAHGRE PLATEAU AND DALLAS DIVIDE-
NORTHWEST SAN JUAN MOUNTAINS-SOUTHWEST SAN JUAN MOUNTAINS-
PARADOX VALLEY/LOWER DOLORES RIVER-
FOUR CORNERS/UPPER DOLORES RIVER-ANIMAS RIVER BASIN-
SAN JUAN RIVER BASIN-SOUTHEAST UTAH-EASTERN UINTA MOUNTAINS-
EASTERN UINTA BASIN-TAVAPUTS PLATEAU-ARCHES/GRAND FLAT-
LA SAL AND ABAJO MOUNTAINS-CANYONLANDS/NATURAL BRIDGES-
530 AM MDT MON AUG 3 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN UTAH AND WESTERN
COLORADO.

.DAY ONE...TODAY AND TONIGHT

THE FOCUS FOR THUNDERSTORMS AND HEAVY SHOWERS TODAY WILL BE
CENTERED FROM NORTHEAST UTAH TO NORTHWEST COLORADO. SHOWERS AND
THUNDERSTORMS WILL BE NUMEROUS IN COVERAGE BY THIS
AFTERNOON...WITH THE FLASH FLOOD THREAT DECREASING BUT STRONG WIND
AND POTENTIAL HAIL THREAT INCREASING. BACKCOUNTRY TRAVELERS SHOULD
REMAIN AWARE OF THE POTENTIAL FOR RAPIDLY RISING SMALL STREAMS OR
NORMALLY DRY WASHES ESPECIALLY IN AREAS WHERE CREEKS ARE SWOLLEN
FROM RAIN ON SUNDAY. THE HEAVIEST PRECIPITATION IS EXPECTED MAINLY
NORTH OF THE BOOKCLIFFS AND TAVAPUTS TODAY.

DRY AIR WILL BEGIN TO MOVE INTO THE REGION TONIGHT AS THE
THUNDERSTORMS MOVE NORTH OUT OF UTAH AND COLORADO.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

TUESDAY...SCATTERED AFTERNOON SHOWERS AND THUNDERSTORMS ARE
EXPECTED OVER THE WESTERN COLORADO HIGH COUNTRY. THESE STORMS WILL
BE WEAKER AND THE POTENTIAL FOR HEAVY RAIN IS LOW.

DRIER CONDITIONS EXPECTED WEDNESDAY AND THURSDAY...ALTHOUGH AN
ISOLATED THUNDERSTORM MAY OCCUR OVER THE WESTERN COLORADO HIGH
COUNTRY.

THE SUMMER MONSOON RETURNS LATE ON FRIDAY OR SATURDAY AND BRINGS
A CHANCE FOR SHOWERS AND THUNDERSTORMS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NECESSARY THIS AFTERNOON OVER NORTHEAST
UTAH AND NORTHWEST COLORADO.

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 3, 6:01 PM MDTAreal Flood AdvisoryGJTDolores, San Miguel3 hr
Aug 3, 6:38 PM MDTSpecial Weather StatementGJTSan Miguel37 min
Aug 3, 6:42 PM MDTSpecial Weather StatementGJTDolores33 min
Aug 3, 7:04 PM MDTSpecial Weather StatementGJTDolores26 min
Aug 3, 7:16 PM MDTSpecial Weather StatementGJTDolores14 min
Aug 3, 7:18 PM MDTSpecial Weather StatementGJTSan Miguel27 min
Aug 3, 10:35 PM MDTSpecial Weather StatementGJTMesa40 min
Aug 3, 10:43 PM MDTSpecial Weather StatementGJT47 min
Aug 3, 11:03 PM MDTSpecial Weather StatementGJTMesa27 min
Aug 3, 11:34 PM MDTSpecial Weather StatementGJTMesa26 min
Aug 3, 11:48 PM MDTSpecial Weather StatementGJTDelta27 min
Aug 3, 6:06 PM MDTSpecial Weather StatementGJTGrand24 min
Aug 3, 7:10 PM MDTSpecial Weather StatementGJTGrand50 min

Nearby

Special Weather Statements in Colorado, 2015Every special weather statement in 2015

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.