Alert archive / Colorado / Flash Flood Watches in 2018

Flash Flood Watch 5, NWS Goodland, KS

July 23, 2018Cheyenne County, Kit Carson County, Colorado

NWS Goodland, KS issued this flash flood watch at Jul 23, 2018, 10:22 AM MDT for Cheyenne County, Kit Carson County, Colorado. It took effect at Jul 23, 2018, 3:00 PM MDT. It was in force for 9 hr.

The area

The counties it named.

The facts

Issued
Jul 23, 2018, 10:22 AM MDT (16:22 UTC)
In effect from
Jul 23, 2018, 3:00 PM MDT
Expired
Jul 24, 2018, 12:00 AM MDT
In force
9 hr
Issued by
NWS Goodland, KS
Flood severity
None

Counties Cheyenne County, CO, Kit Carson County, CO

The radar

The Goodland radar (KGLD), 85 km from the middle of the area, began a volume at 16:22 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, 4.4 hours before the alert went out and 104 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 2018-07-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 267 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 2018-07-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -4 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
267 J/kg
Mixed-layer CIN
-81 J/kg
Mixed-layer LCL
981 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
-4 m²/s²
0-3 km storm-relative helicity
80 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.1

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood watch 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 flash flood watch went out at Jul 23, 6:31 AM MDT, 3 hours 51 minutes earlier.

Area forecast discussion, Jul 23, 6:31 AM MDT, 3 hours 51 minutes before
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Hazardous weather outlook, Jul 23, 4:07 AM MDT, 6 hours 15 minutes before
Hazardous Weather Outlook
National Weather Service Goodland KS
407 AM MDT Mon Jul 23 2018

COZ090>092-KSZ001>004-013>016-027>029-041-042-NEZ079>081-241015-
Yuma County-Kit Carson County-Cheyenne County-Cheyenne-Rawlins-
Decatur-Norton-Sherman-Thomas-Sheridan-Graham-Wallace-Logan-Gove-
Greeley-Wichita-Dundy-Hitchcock-Red Willow-
407 AM MDT Mon Jul 23 2018 /507 AM CDT Mon Jul 23 2018/

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

.DAY ONE...TODAY AND TONIGHT...

An area of thunderstorms will form west of the Tri-State Area by mid
afternoon, moving into Kit Carson and Cheyenne counties around 5 PM
MDT. Flash flooding and hail up to ping-pong ball size may occur. The
best time for severe weather to occur will be from 5 to 11 PM MDT
for locations west of a Burlington to Leoti line. Confidence of
severe thunderstorms occurring increases to the southwest.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY...

Wednesday severe thunderstorms and flash flooding may occur during
the afternoon and evening. Confidence of hazardous weather occurring
is greatest south of I-70.

Locally heavy rainfall is likely from Thursday through Saturday
night. Severe thunderstorms may occur Friday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed. Any reports by phone or through
social media are greatly appreciated.

JTL

In the hours before

Local storm report, Jul 23, 6:54 AM MDT, 3 hours 28 minutes before
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Special weather statement, Jul 23, 8:38 AM MDT, 1 hour 44 minutes before
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Special weather statement, Jul 23, 9:03 AM MDT, 1 hour 19 minutes before
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Special weather statement, Jul 23, 9:31 AM MDT, 51 minutes before
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Local storm report, Jul 23, 9:39 AM MDT, 43 minutes before
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Local storm report, Jul 23, 9:43 AM MDT, 39 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GOODLAND KS
943 AM MDT MON JUL 23 2018

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0810 PM     HAIL             4 NNE WRAY              40.14N 102.20W
07/22/2018  E1.00 INCH       YUMA               CO   COCORAHS

&&

SJS

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 22, 7:49 PM MDTSpecial Weather StatementGLDCheyenne11 min
Jul 22, 8:14 PM MDTSevere Thunderstorm WarningGLDCheyenne46 min
Jul 22, 8:15 PM MDTSevere Thunderstorm WarningGLDCheyenne45 min
Jul 22, 9:00 PM MDTSevere Thunderstorm WarningGLDCheyenne, Rawlins45 min
Jul 22, 9:47 PM MDTSpecial Weather StatementGLDSherman13 min
Jul 22, 9:57 PM MDTSevere Thunderstorm WarningGLDSherman48 min
Jul 22, 11:02 PM MDTSpecial Weather StatementGLDWallace28 min
Jul 23, 2:17 PM MDTSpecial Weather StatementGLDGreeley43 min
Jul 23, 2:35 PM MDTSpecial Weather StatementGLDGreeley40 min
Jul 23, 2:51 PM MDTSpecial Weather StatementGLDGreeley24 min
Jul 23, 2:55 PM MDTSevere Thunderstorm WarningGLDGreeley35 min
Jul 22, 6:01 PM MDTSpecial Weather StatementGLDCheyenne14 min
Jul 22, 6:04 PM MDTSpecial Weather StatementGLDKit Carson11 min
Jul 22, 6:20 PM MDTSpecial Weather StatementGLDCheyenne25 min
Jul 22, 6:22 PM MDTSevere Thunderstorm WarningGLDKit Carson38 min
Jul 22, 6:24 PM MDTSevere Thunderstorm WarningGLDCheyenne51 min
Jul 22, 6:38 PM MDTFlash Flood WarningGLDCheyenne3 hr
Jul 22, 7:03 PM MDTSpecial Weather StatementGLDKit Carson12 min
Jul 22, 7:08 PM MDTSpecial Weather StatementGLDYuma22 min
Jul 22, 7:31 PM MDTSpecial Weather StatementGLDKit Carson14 min
Jul 22, 7:43 PM MDTSpecial Weather StatementGLDYuma17 min
Jul 22, 7:45 PM MDTSpecial Weather StatementGLDKit Carson15 min
Jul 22, 7:57 PM MDTSpecial Weather StatementGLDYuma18 min
Jul 22, 8:01 PM MDTSpecial Weather StatementGLDYuma14 min
Jul 22, 8:17 PM MDTSevere Thunderstorm WarningGLDYuma43 min
Jul 22, 8:37 PM MDTSpecial Weather StatementGLDKit Carson23 min
Jul 22, 10:14 PM MDTFlash Flood WarningGLDKit Carson, Yuma3 hr
Jul 22, 11:15 PM MDTSpecial Weather StatementGLDKit Carson15 min
Jul 23, 8:38 AM MDTSpecial Weather StatementGLDYuma22 min
Jul 23, 9:03 AM MDTSpecial Weather StatementGLDYuma27 min
Jul 23, 9:31 AM MDTSpecial Weather StatementGLDYuma14 min
Jul 23, 4:44 PM MDTSpecial Weather StatementGLDCheyenne46 min
Jul 22, 8:07 PM MDTSpecial Weather StatementGLDDundy8 min

Nearby

Flash Flood Watches in Colorado, 2018Every flash flood watch 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.