Alert archive / Colorado / Flash Flood Warnings in 2021
Flash Flood Warning 31, NWS Goodland, KS
NWS Goodland, KS issued this flash flood warning at Jul 16, 2021, 5:39 PM MDT for Cheyenne County, Colorado. It was in force for 58 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 16, 2021, 5:39 PM MDT (23:39 UTC)
- Expired
- Jul 16, 2021, 6:37 PM MDT
- In force
- 58 min
- Issued by
- NWS Goodland, KS
- Area
- Storm-based polygon
- Flood severity
- None
County Cheyenne County, CO
The radar
The Pueblo radar (KPUX), 107 km from the middle of the area, began a volume at 23:43 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, 11.7 hours before the alert went out and 102 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2659 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 6 m²/s²
- 0-3 km storm-relative helicity
- 14 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
358
WGUS53 KGLD 162339
FFWGLD
COC017-170145-
/O.NEW.KGLD.FF.W.0031.210716T2339Z-210717T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Goodland KS
539 PM MDT Fri Jul 16 2021
The National Weather Service in Goodland has issued a
* Flash Flood Warning for...
Northwestern Cheyenne County in east central Colorado...
* Until 745 PM MDT.
* At 539 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...Radar.
IMPACT...Flash flooding of small creeks and streams, urban
areas, highways, streets and underpasses as well as
other poor drainage and low-lying areas.
* Some locations that will experience flash flooding include...
mainly rural areas of Northwestern Cheyenne County
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3902 10316 3903 10297 3887 10295 3886 10316
3888 10316 3889 10316 3893 10316 3894 10316
3897 10316 3898 10316 3900 10316 3901 10316
FLASH FLOOD...RADAR INDICATED
$$
JN2 follow-up statements
522
WGUS73 KGLD 170000
FFSGLD
Flash Flood Statement
National Weather Service Goodland KS
600 PM MDT Fri Jul 16 2021
COC017-170145-
/O.CON.KGLD.FF.W.0031.000000T0000Z-210717T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Cheyenne CO-
600 PM MDT Fri Jul 16 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 745 PM MDT THIS
EVENING FOR NORTHWESTERN CHEYENNE COUNTY...
At 600 PM MDT, Doppler radar indicated thunderstorms producing heavy
rain across the warned area. Flash flooding is ongoing or expected
to begin shortly.
HAZARD...Flash flooding caused by thunderstorms.
SOURCE...Radar.
IMPACT...Flash flooding of small creeks and streams, urban areas,
highways, streets and underpasses as well as other poor
drainage and low-lying areas.
Some locations that will experience flash flooding include...
mainly rural areas of Northwestern Cheyenne County
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Please report observed flooding to local emergency services or law
enforcement and request they pass this information to the National
Weather Service when you can do so safely.
&&
LAT...LON 3902 10316 3903 10297 3887 10295 3886 10316
3888 10316 3889 10316 3893 10316 3894 10316
3897 10316 3898 10316 3900 10316 3901 10316
FLASH FLOOD...RADAR INDICATED
$$
JN487
WGUS73 KGLD 170037
FFSGLD
Flash Flood Statement
National Weather Service Goodland KS
637 PM MDT Fri Jul 16 2021
COC017-170047-
/O.CAN.KGLD.FF.W.0031.000000T0000Z-210717T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Cheyenne CO-
637 PM MDT Fri Jul 16 2021
...FLASH FLOOD WARNING IS CANCELLED FOR NORTHWESTERN CHEYENNE
COUNTY...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
LAT...LON 3902 10316 3903 10297 3887 10295 3886 10316
3888 10316 3889 10316 3893 10316 3894 10316
3897 10316 3898 10316 3900 10316 3901 10316
$$
JNThe office that day
Everything else NWS Goodland, KS issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 15, 10:20 PM MDT | Dense Fog Advisory | GLD | Kit Carson, Yuma | 11 hr |
| Jul 16, 4:15 PM MDT | Special Weather Statement | GLD | Kit Carson | 30 min |
| Jul 16, 4:44 PM MDT | Special Weather Statement | GLD | Yuma | 46 min |
| Jul 16, 5:02 PM MDT | Special Weather Statement | GLD | Cheyenne | 28 min |
| Jul 16, 5:29 PM MDT | Flash Flood Warning | GLD | Kit Carson | 87 min |
| Jul 16, 5:34 PM MDT | Severe Thunderstorm Warning | GLD | Kit Carson | 56 min |
| Jul 16, 5:37 PM MDT | Special Weather Statement | GLD | Cheyenne | 23 min |
| Jul 16, 5:42 PM MDT | Severe Thunderstorm Warning | GLD | Cheyenne | 14 min |
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.