Alert archive / Colorado / Special Weather Statements in 2018

Special Weather Statement, NWS Goodland, KS

July 12, 2018Cheyenne County, Colorado

NWS Goodland, KS issued this special weather statement at Jul 12, 2018, 4:13 PM MDT for Cheyenne County, Colorado. It was in force for 17 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
Jul 12, 2018, 4:13 PM MDT (22:13 UTC)
Expired
Jul 12, 2018, 4:30 PM MDT
In force
17 min
Issued by
NWS Goodland, KS

County Cheyenne County, CO

The radar

The Pueblo radar (KPUX), 117 km from the middle of the area, began a volume at 22:16 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

Denver, CO (KDEN), launched 12:00Z, 10.2 hours before the alert went out and 126 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 12:00Z on 2018-07-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 6 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 12:00Z on 2018-07-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 1 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
6 J/kg
Mixed-layer CIN
-334 J/kg
Mixed-layer LCL
1617 m above ground
0-6 km bulk shear
10 kt
0-1 km storm-relative helicity
1 m²/s²
0-3 km storm-relative helicity
30 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 Jul 12, 1:46 PM MDT, 2 hours 27 minutes earlier.

Area forecast discussion, Jul 12, 1:46 PM MDT, 2 hours 27 minutes before
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Hazardous weather outlook, Jul 12, 10:46 AM MDT, 5 hours 27 minutes before
Hazardous Weather Outlook
National Weather Service Goodland KS
1046 AM MDT Thu Jul 12 2018

COZ090>092-KSZ001>004-013>016-027>029-041-042-NEZ079>081-131200-
Yuma County-Kit Carson County-Cheyenne County-Cheyenne-Rawlins-
Decatur-Norton-Sherman-Thomas-Sheridan-Graham-Wallace-Logan-Gove-
Greeley-Wichita-Dundy-Hitchcock-Red Willow-
1046 AM MDT Thu Jul 12 2018 /1146 AM CDT Thu Jul 12 2018/

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

.DAY ONE...THIS AFTERNOON AND TONIGHT...

Scattered thunderstorms will develop along and west of the Colorado
border this afternoon and slowly move east through the rest of the
night. A few of these storms become severe along and west of a line
from Burlington to Saint Francis to Benkelman. The main severe threat
will be damaging winds. A more widespread threat with these storms
will be locally heavy rainfall which could cause flash flooding.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH THURSDAY...

Scattered thunderstorms are expected mainly Friday afternoon and
evening across much of the area. An isolated severe thunderstorm
cannot be ruled out. Locally heavy rainfall will also be possible.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be required this afternoon.

In the hours before

Special weather statement, Jul 12, 3:00 PM MDT, 1 hour 13 minutes before
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Special weather statement, Jul 12, 4:13 PM MDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 12, 4:18 PM MDTSpecial Weather StatementGLDCheyenne27 min
Jul 12, 3:00 PM MDTSpecial Weather StatementGLDDundy15 min

Nearby

Special Weather Statements in Colorado, 2018Every special weather statement 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.