Alert archive / Colorado / Flash Flood Warnings in 2021
Flash Flood Warning 33, NWS Goodland, KS
NWS Goodland, KS issued this flash flood warning at Aug 12, 2021, 7:28 PM MDT for Kit Carson County, Colorado. It was in force for 3 hr. 2 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Aug 12, 2021, 7:28 PM MDT (01:28 UTC)
- Expired
- Aug 12, 2021, 10:30 PM MDT
- In force
- 3 hr
- Issued by
- NWS Goodland, KS
- Area
- Storm-based polygon
- Flood severity
- None
County Kit Carson County, CO
The radar
The Goodland radar (KGLD), 91 km from the middle of the area, began a volume at 01:29 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 12, 8:40 PM MDT | HEAVY RAIN 6.05 | Vona, CO | RAINFALL STARTED AROUND 530PM MT, JUST SPRINKLING NOW. |
| Aug 12, 8:41 PM MDT | FLASH FLOOD | 1 Wsw Vona, CO | REPORTS OF BASEMENTS FLOODING, SOME SIDEWALKS DOWNTOWN ARE NOT VISIBLE DUE TO THE STANDING WATER. 6 INCHES OF RAIN FELL IN 3 HOURS. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Denver, CO (KDNR), launched 00:00Z, 1.5 hours before the alert went out and 75 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
- 616 J/kg
- Mixed-layer CIN
- -65 J/kg
- Mixed-layer LCL
- 2322 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- 1 m²/s²
- 0-3 km storm-relative helicity
- 98 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
734
WGUS53 KGLD 130128
FFWGLD
COC063-130430-
/O.NEW.KGLD.FF.W.0033.210813T0128Z-210813T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Goodland KS
728 PM MDT Thu Aug 12 2021
The National Weather Service in Goodland has issued a
* Flash Flood Warning for...
Central Kit Carson County in east central Colorado...
* Until 1030 PM MDT.
* At 728 PM MDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 1 and 2 inches of rain
have fallen. 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...
Vona.
This includes the following highways...
Interstate 70 in Colorado between mile markers 408 and 417.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3935 10283 3936 10265 3922 10264 3922 10282
FLASH FLOOD...RADAR INDICATED
$$
0242 follow-up statements
865
WGUS73 KGLD 130225
FFSGLD
Flash Flood Statement
National Weather Service Goodland KS
825 PM MDT Thu Aug 12 2021
COC063-130430-
/O.CON.KGLD.FF.W.0033.000000T0000Z-210813T0430Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Kit Carson CO-
825 PM MDT Thu Aug 12 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1030 PM MDT THIS
EVENING FOR CENTRAL KIT CARSON COUNTY...
At 825 PM MDT, gauge reports indicated thunderstorms producing heavy
rain across the warned area. Between 5 and 6 inches of rain have
fallen. Flash flooding is ongoing or expected to begin shortly.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Gauges reported.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
Some locations that will experience flash flooding include...
Vona.
This includes the following highways...
Interstate 70 in Colorado between mile markers 408 and 417.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Be especially cautious at night when it is harder to recognize the
dangers of flooding.
&&
LAT...LON 3935 10283 3936 10265 3922 10264 3922 10282
FLASH FLOOD...GAUGE INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
024763 WGUS73 KGLD 130426 FFSGLD Flash Flood Statement National Weather Service Goodland KS 1026 PM MDT Thu Aug 12 2021 COC063-130436- /O.EXP.KGLD.FF.W.0033.000000T0000Z-210813T0430Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Kit Carson CO- 1026 PM MDT Thu Aug 12 2021 ...FLASH FLOOD WARNING WILL EXPIRE AT 1030 PM MDT THIS EVENING FOR CENTRAL KIT CARSON COUNTY... The heavy rain has ended. Flooding is no longer expected to pose a threat. Please continue to heed remaining road closures. LAT...LON 3935 10283 3936 10265 3922 10264 3922 10282 $$ 024
The office that day
Everything else NWS Goodland, KS issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 12, 7:08 PM MDT | Special Weather Statement | GLD | Kit Carson | 37 min |
| Aug 12, 7:16 PM MDT | Severe Thunderstorm Warning | GLD | Kit Carson | 29 min |
| Aug 12, 7:45 PM MDT | Severe Thunderstorm Warning | GLD | Kit Carson | 45 min |
| Aug 12, 7:52 PM MDT | Severe Thunderstorm Warning | GLD | Kit Carson | 29 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.