Alert archive / Colorado / Special Weather Statements in 2021

Special Weather Statement, NWS Goodland, KS

September 11, 2021Cheyenne County, Kit Carson County, Yuma County, Colorado

NWS Goodland, KS issued this special weather statement at Sep 11, 2021, 9:32 PM MDT for Cheyenne County, Kit Carson County, Yuma County, Colorado. It was in force for 28 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
Sep 11, 2021, 9:32 PM MDT (03:32 UTC)
Expired
Sep 11, 2021, 10:00 PM MDT
In force
28 min
Issued by
NWS Goodland, KS
Hail
0.00 in
Wind
30

Counties Cheyenne County, CO, Kit Carson County, CO, Yuma County, CO

The radar

The Goodland radar (KGLD), 89 km from the middle of the area, began a volume at 03:33 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

Denver, CO (KDNR), launched 00:00Z, 3.5 hours before the alert went out and 58 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, Denver, CO at 00:00Z on 2021-09-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 403 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, Denver, CO at 00:00Z on 2021-09-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 30 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
403 J/kg
Mixed-layer CIN
-128 J/kg
Mixed-layer LCL
3631 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
30 m²/s²
0-3 km storm-relative helicity
139 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

Open this sounding in Storm Lab

The text

As transmitted.

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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 Goodland, KS wrote its last area forecast discussion before this special weather statement went out at Sep 11, 5:45 PM MDT, 3 hours 47 minutes earlier.

Area forecast discussion, Sep 11, 5:45 PM MDT, 3 hours 47 minutes before
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  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
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  <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.
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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, Sep 11, 8:28 PM MDT, 1 hour 4 minutes before
Hazardous Weather Outlook
National Weather Service Goodland KS
828 PM MDT Sat Sep 11 2021

COZ090>092-KSZ001>004-013>016-027>029-041-042-NEZ079>081-121645-
Yuma-Kit Carson-Cheyenne-Rawlins-Decatur-Norton-Sherman-Thomas-
Sheridan-Graham-Wallace-Logan-Gove-Greeley-Wichita-Dundy-Hitchcock-
Red Willow-
828 PM MDT Sat Sep 11 2021 /928 PM CDT Sat Sep 11 2021/

This hazardous weather outlook is for extreme southwest Nebraska...
northwest Kansas and east central Colorado.

.DAY ONE...TODAY...

Isolated thunderstorms will track across northeast Colorado this
evening. Gusty and potentially damaging winds cannot be ruled out in
association with any thunderstorms, mainly over northeast Colorado
and adjacent Kansas and Nebraska border counties between 7 PM and 11
PM MDT.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH SATURDAY...

Severe thunderstorms are possible late Sunday afternoon and evening
from 5 PM MDT to 10 PM MDT, mainly in northeast Colorado and
adjacent Kansas and Nebraska border counties. The primary hazards
are wind gusts up to 65 mph and hail up to one inch in diameter.

Elevated fire weather conditions are possible Monday afternoon south
of a line from Flagler to Tribune and Leoti.

Elevated fire weather conditions are possible Thursday afternoon
across far eastern Colorado.

Elevated fire weather conditions are possible Saturday afternoon
along and west of Highway 25.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be required.

In the hours before

Special weather statement, Sep 11, 9:32 PM MDT, 0 minutes before
Special Weather Statement
National Weather Service Goodland KS
932 PM MDT Sat Sep 11 2021

COZ090>092-120400-
Kit Carson County CO-Cheyenne County CO-Yuma County CO-
932 PM MDT Sat Sep 11 2021

...Strong thunderstorms will impact portions of western Cheyenne
County in east central Colorado, Yuma County in northeastern Colorado
and Kit Carson Counties in east central Colorado through 1000 PM
MDT...

At 929 PM MDT, Doppler radar was tracking the outflow from
thunderstorms along a line extending from 8 miles east of Lone Star
to 8 miles south of Yuma to 6 miles north of Seibert to 13 miles
south of Flagler.
Movement was east at 45 mph.

HAZARD...Wind gusts between 30 and 40 mph and occasional lightning.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Strong thunderstorms will be near...
  Vona around 935 PM MDT.
  Stratton around 945 PM MDT.

Other locations in the path of these storms include Bethune.

This includes the following highways...
 Interstate 70 in Colorado between mile markers 391 and 440.
 Highway 385 between mile markers 160 and 165, and between mile
markers 171 and 261.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3957 10314 3957 10280 4025 10279 4032 10276
      4032 10214 3950 10216 3901 10229 3863 10269
      3871 10316
TIME...MOT...LOC 0329Z 276DEG 39KT 4034 10268 4000 10269 3938 10283
3911 10311

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...30 MPH

Lockhart

The office that day

Everything else NWS Goodland, KS issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 11, 10:46 PM MDTSpecial Weather StatementGLDSherman29 min
Sep 11, 11:15 PM MDTSpecial Weather StatementGLDCheyenne, Rawlins, Sherman45 min
Sep 11, 11:57 PM MDTSpecial Weather StatementGLDLogan, Thomas33 min
Sep 12, 1:33 AM MDTSpecial Weather StatementGLDCheyenne27 min
Sep 11, 10:13 PM MDTSpecial Weather StatementGLDKit Carson32 min
Sep 12, 4:35 PM MDTSpecial Weather StatementGLDKit Carson25 min
Sep 12, 4:59 PM MDTSpecial Weather StatementGLDKit Carson31 min
Sep 12, 5:06 PM MDTSevere Thunderstorm WarningGLDKit Carson54 min
Sep 12, 5:44 PM MDTSevere Thunderstorm WarningGLDCheyenne, Kit Carson61 min
Sep 12, 5:58 PM MDTSevere Thunderstorm WarningGLDKit Carson, Yuma47 min

Nearby

Special Weather Statements in Colorado, 2021Every special weather statement in 2021

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.