Alert archive / Kansas / Flash Flood Watches in 2018

Flash Flood Watch 6, NWS Goodland, KS

July 25, 201813 counties in Kansas; Cheyenne County, Kit Carson County, Yuma County, Colorado

NWS Goodland, KS issued this flash flood watch at Jul 25, 2018, 12:46 PM CDT for 13 counties in Kansas; Cheyenne County, Kit Carson County, Yuma County, Colorado. It took effect at Jul 25, 2018, 4:00 PM CDT. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued
Jul 25, 2018, 12:46 PM CDT (17:46 UTC)
In effect from
Jul 25, 2018, 4:00 PM CDT
Expired
Jul 26, 2018, 12:05 AM CDT
In force
8 hr
Issued by
NWS Goodland, KS
Flood severity
None

Counties Cheyenne County, CO, Kit Carson County, CO, Yuma County, CO, Cheyenne County, KS, Decatur County, KS, Gove County, KS, Graham County, KS, Greeley County, KS, Logan County, KS, Norton County, KS, Rawlins County, KS, Sheridan County, KS, Sherman County, KS, Thomas County, KS, Wallace County, KS, Wichita County, KS

The radar

The Goodland radar (KGLD), 38 km from the middle of the area, began a volume at 17:50 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, 5.8 hours before the alert went out and 180 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 2018-07-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 20 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 2018-07-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 87 square meters per square second.19395878Sfc1 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
20 J/kg
Mixed-layer CIN
-431 J/kg
Mixed-layer LCL
2245 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
87 m²/s²
0-3 km storm-relative helicity
74 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 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 25, 12:41 PM CDT, 5 minutes earlier.

Area forecast discussion, Jul 25, 12:41 PM CDT, 5 minutes before
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Hazardous weather outlook, Jul 25, 6:20 AM CDT, 6 hours 26 minutes before
Hazardous Weather Outlook
National Weather Service Goodland KS
520 AM MDT Wed Jul 25 2018

COZ090>092-KSZ001>004-013>016-027>029-041-042-NEZ079>081-261130-
Yuma County-Kit Carson County-Cheyenne County-Cheyenne-Rawlins-
Decatur-Norton-Sherman-Thomas-Sheridan-Graham-Wallace-Logan-Gove-
Greeley-Wichita-Dundy-Hitchcock-Red Willow-
520 AM MDT Wed Jul 25 2018 /620 AM CDT Wed Jul 25 2018/

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

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

Isolated thunderstorms are possible for a few hours this morning
generally east of a line from Trenton Nebraska to Hill City Kansas.
Gusty winds, small hail and a brief period of heavy rainfall will be
possible.

There is a slight risk of severe thunderstorms for nearly the entire
Tri-State area from early this afternoon through mid evening as a
frontal boundary sets up across the area. The primary threats will
be hail to the size of golf balls, wind gusts over 60 mph and
locally heavy rainfall which could produce flash flooding. A few
tornados are also possible.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY...

There is a marginal risk of severe thunderstorms across much of the
area Friday and Friday night with a slight risk of severe weather
from Yuma to Trenton northward. Locally heavy rainfall and the
possibility of flash flooding will also exist.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be required after 2 PM MDT (3 PM CDT).

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 25, 4:32 PM CDTSpecial Weather StatementGLDNorton43 min
Jul 25, 4:48 PM CDTSevere Thunderstorm WarningGLDNorton42 min
Jul 25, 5:12 PM CDTSevere Thunderstorm WarningGLDNorton33 min
Jul 25, 5:26 PM CDTTornado WarningGLDGraham, Norton14 min
Jul 25, 5:34 PM CDTSevere Thunderstorm WarningGLDGraham, Norton41 min
Jul 25, 5:50 PM CDTSevere Thunderstorm WarningGLDGraham40 min
Jul 25, 5:52 PM CDTSpecial Weather StatementGLDGove38 min
Jul 25, 5:54 PM CDTSevere Thunderstorm WarningGLDGove51 min
Jul 25, 6:13 PM CDTFlash Flood WarningGLDGraham111 min
Jul 25, 6:23 PM CDTSevere Thunderstorm WarningGLDGove37 min
Jul 25, 6:28 PM CDTFlash Flood WarningGLDGove58 min
Jul 25, 6:44 PM CDTSevere Thunderstorm WarningGLDGove13 min
Jul 25, 1:28 PM CDTSevere Thunderstorm WarningGLDRed Willow33 min
Jul 25, 2:03 PM CDTSpecial Weather StatementGLDRed Willow27 min
Jul 25, 2:56 PM CDTSevere Thunderstorm WarningGLDRed Willow34 min
Jul 25, 3:33 PM CDTSpecial Weather StatementGLDRed Willow42 min
Jul 25, 3:38 PM CDTSpecial Weather StatementGLDRed Willow37 min
Jul 25, 3:51 PM CDTSevere Thunderstorm WarningGLDRed Willow24 min

Nearby

Flash Flood Watches in Kansas, 2018Flash 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.