Alert archive / Colorado / Flash Flood Warnings in 2018

Flash Flood Warning 49, NWS Goodland, KS

August 25, 2018Yuma County, Colorado

NWS Goodland, KS issued this flash flood warning at Aug 25, 2018, 7:28 PM MDT for Yuma County, Colorado. It was in force for 3 hr. 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 25, 2018, 7:28 PM MDT (01:28 UTC)
Expired
Aug 25, 2018, 10:30 PM MDT
In force
3 hr
Issued by
NWS Goodland, KS
Area
Storm-based polygon
Flood severity
None

County Yuma County, CO

The radar

The Goodland radar (KGLD), 101 km from the middle of the area, began a volume at 01:30 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 00:00Z, 1.5 hours before the alert went out and 46 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 2018-08-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 78 joules per kilogram.LCLEL10008507005003002001001 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 2018-08-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 10 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
78 J/kg
Mixed-layer CIN
-6 J/kg
Mixed-layer LCL
3559 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
10 m²/s²
0-3 km storm-relative helicity
72 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

423 
WGUS53 KGLD 260128
FFWGLD
COC125-260430-
/O.NEW.KGLD.FF.W.0049.180826T0128Z-180826T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Goodland KS
728 PM MDT SAT AUG 25 2018

The National Weather Service in Goodland has issued a

* Flash Flood Warning for...
  Southwestern Yuma County in northeastern Colorado...

* Until 1030 PM MDT.

* At 727 PM MDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Over 4 inches of rain have 
  fallen, with rainfall rates of 2-3 inches per hour occurring over 
  the same location . Flash flooding is expected to begin shortly.

* Some locations that will experience flooding include...
  Abarr and Heartstrong. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, country roads, farmland, and other low lying
spots.

&&

LAT...LON 3997 10280 3998 10254 3970 10251 3969 10280

$$

Lundquist
2 follow-up statements
128 
WGUS73 KGLD 260241
FFSGLD

Flash Flood Statement
National Weather Service Goodland KS
841 PM MDT SAT AUG 25 2018

COC125-260430-
/O.CON.KGLD.FF.W.0049.000000T0000Z-180826T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Yuma CO-
841 PM MDT SAT AUG 25 2018

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1030 PM MDT FOR
SOUTHWESTERN YUMA COUNTY...

At 840 PM MDT, Doppler radar up to four inches of rain have fallen. 
Flash flooding is expected to begin shortly if not already occurring.

Some locations that will experience flooding include...
Abarr and Heartstrong. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Be especially cautious at night when it is harder to recognize the
dangers of flooding.

Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, country roads, farmland, and other low lying
spots.

&&

LAT...LON 3997 10280 3998 10254 3970 10251 3969 10280

$$

Lundquist
294 
WGUS73 KGLD 260421
FFSGLD

Flash Flood Statement
National Weather Service Goodland KS
1021 PM MDT SAT AUG 25 2018

COC125-260431-
/O.EXP.KGLD.FF.W.0049.000000T0000Z-180826T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Yuma CO-
1021 PM MDT SAT AUG 25 2018

...THE FLASH FLOOD WARNING FOR SOUTHWESTERN YUMA COUNTY WILL EXPIRE
AT 1030 PM MDT...

The heavy rain has ended. Flood waters have receded. Flooding is no
longer expected to pose a threat. Please continue to heed any
remaining road closures.

LAT...LON 3997 10280 3998 10254 3970 10251 3969 10280

$$

DDT

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 25, 6:30 PM MDTSpecial Weather StatementGLDYuma15 min
Aug 25, 6:46 PM MDTSpecial Weather StatementGLDCheyenne14 min
Aug 25, 6:52 PM MDTSpecial Weather StatementGLDYuma8 min
Aug 25, 6:55 PM MDTSpecial Weather StatementGLDYuma20 min
Aug 25, 7:01 PM MDTSpecial Weather StatementGLDYuma14 min
Aug 25, 7:11 PM MDTSevere Thunderstorm WarningGLDYuma49 min
Aug 25, 8:33 PM MDTSpecial Weather StatementGLDYuma27 min
Aug 25, 9:16 PM MDTSpecial Weather StatementGLDYuma14 min
Aug 26, 5:04 PM MDTSpecial Weather StatementGLDCheyenne, Kit Carson, Yuma26 min
Aug 26, 5:32 PM MDTSpecial Weather StatementGLDKit Carson, Yuma28 min
Aug 26, 5:59 PM MDTSpecial Weather StatementGLDCheyenne, Kit Carson, Yuma31 min

Nearby

Flash Flood Warnings in Colorado, 2018Every flash flood warning 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.