Alert archive / Colorado / Flash Flood Warnings in 2021

Flash Flood Warning 16, NWS Goodland, KS

May 17, 2021Yuma County, Colorado

NWS Goodland, KS issued this flash flood warning at May 17, 2021, 2:27 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
May 17, 2021, 2:27 PM MDT (20:27 UTC)
Expired
May 17, 2021, 4:58 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), 91 km from the middle of the area, began a volume at 20:28 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 12:00Z, 8.5 hours before the alert went out and 85 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 2021-05-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 44 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 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 2021-05-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -7 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
44 J/kg
Mixed-layer CIN
-30 J/kg
Mixed-layer LCL
779 m above ground
0-6 km bulk shear
9 kt
0-1 km storm-relative helicity
-7 m²/s²
0-3 km storm-relative helicity
12 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

879 
WGUS53 KGLD 172027
FFWGLD
COC125-180030-
/O.NEW.KGLD.FF.W.0016.210517T2027Z-210518T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Goodland KS
227 PM MDT Mon May 17 2021

The National Weather Service in Goodland has issued a

* Flash Flood Warning for...
  East Central Yuma County in northeastern Colorado...

* Until 630 PM MDT.

* At 226 PM MDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Flash flooding is ongoing or 
  expected to begin shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Doppler radar.

  IMPACT...Flooding of small creeks and streams, urban areas,
           highways, streets and underpasses as well as other
           drainage and low lying areas.

* Some locations that will experience flash flooding include...
  Wray, Vernon and Laird.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

Please report flooding to your local law enforcement agency when you 
can do so safely.

&&

LAT...LON 4022 10232 4022 10205 3981 10218 3983 10243

FLASH FLOOD...RADAR INDICATED

$$

ANW
1 follow-up statement
416 
WGUS73 KGLD 172258
FFSGLD

Flash Flood Statement
National Weather Service Goodland KS
458 PM MDT Mon May 17 2021

COC125-172308-
/O.CAN.KGLD.FF.W.0016.000000T0000Z-210518T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Yuma CO-
458 PM MDT Mon May 17 2021

...FLASH FLOOD WARNING IS CANCELLED FOR EAST CENTRAL YUMA COUNTY...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat.

LAT...LON 4022 10232 4022 10205 3981 10218 3983 10243

$$

ANW

The office that day

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

IssuedProductOfficeCountiesLasted
May 16, 6:04 PM MDTFlash Flood WarningGLDCheyenne3 hr
May 16, 6:14 PM MDTSpecial Weather StatementGLDCheyenne61 min
May 16, 6:40 PM MDTSevere Thunderstorm WarningGLDKit Carson35 min
May 16, 6:56 PM MDTTornado WarningGLDKit Carson18 min
May 16, 7:07 PM MDTSpecial Weather StatementGLDKit Carson23 min
May 16, 7:10 PM MDTSpecial Weather StatementGLDKit Carson35 min
May 16, 7:10 PM MDTTornado WarningGLDCheyenne, Kit Carson35 min
May 16, 7:16 PM MDTSevere Thunderstorm WarningGLDKit Carson29 min
May 16, 7:22 PM MDTFlash Flood WarningGLDKit Carson5 hr
May 16, 7:42 PM MDTSpecial Weather StatementGLDKit Carson63 min
May 16, 7:58 PM MDTSpecial Weather StatementGLDKit Carson47 min
May 16, 8:24 PM MDTFlash Flood WarningGLDKit Carson4 hr
May 16, 8:39 PM MDTSpecial Weather StatementGLDYuma66 min
May 16, 8:42 PM MDTSpecial Weather StatementGLDKit Carson78 min
May 16, 8:49 PM MDTSpecial Weather StatementGLDCheyenne71 min
May 16, 9:09 PM MDTAreal Flood WarningGLDCheyenne3 hr
May 16, 9:52 PM MDTSpecial Weather StatementGLDYuma53 min
May 16, 10:57 PM MDTSpecial Weather StatementGLDYuma63 min
May 17, 12:12 AM MDTAreal Flood WarningGLDKit Carson6 hr

Nearby

Flash Flood Warnings in Colorado, 2021Every flash flood warning 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.