Alert archive / Colorado / Flash Flood Warnings in 2021
Flash Flood Warning 65, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this flash flood warning at Aug 3, 2021, 2:58 PM MDT for Elbert County, Colorado. It was in force for 2 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 3, 2021, 2:58 PM MDT (20:58 UTC)
- Expired
- Aug 3, 2021, 5:00 PM MDT
- In force
- 2 hr
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Flood severity
- None
County Elbert County, CO
The radar
The Denver radar (KFTG), 56 km from the middle of the area, began a volume at 21:01 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, 9.0 hours before the alert went out and 99 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
- 12 J/kg
- Mixed-layer CIN
- -226 J/kg
- Mixed-layer LCL
- 2110 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- -16 m²/s²
- 0-3 km storm-relative helicity
- -6 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
033
WGUS55 KBOU 032058
FFWBOU
COC039-032300-
/O.NEW.KBOU.FF.W.0065.210803T2058Z-210803T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Denver CO
258 PM MDT Tue Aug 3 2021
The National Weather Service in Denver has issued a
* Flash Flood Warning for...
North Central Elbert County in east central Colorado...
* Until 500 PM MDT.
* At 258 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, gulches,
roads, and poor drainage and low-lying areas.
* Some locations that will experience flash flooding include...
mainly rural areas of North Central Elbert County
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
Be aware of your surroundings and do not drive on flooded roads.
&&
LAT...LON 3931 10416 3930 10422 3940 10426 3942 10422
3942 10416 3939 10413
FLASH FLOOD...RADAR INDICATED
$$
Meier1 follow-up statement
956
WGUS75 KBOU 032252
FFSBOU
Flash Flood Statement
National Weather Service Denver CO
452 PM MDT Tue Aug 3 2021
COC039-032302-
/O.EXP.KBOU.FF.W.0065.000000T0000Z-210803T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Elbert CO-
452 PM MDT Tue Aug 3 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 5 PM MDT THIS AFTERNOON FOR
NORTH CENTRAL ELBERT COUNTY...
The heavy rain has ended. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
LAT...LON 3931 10416 3930 10422 3940 10426 3942 10422
3942 10416 3939 10413
$$
MeierThe office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 2, 6:26 PM MDT | Flash Flood Warning | BOU | Larimer | 116 min |
| Aug 3, 3:41 AM MDT | Flash Flood Watch | BOU | Boulder, Clear Creek, Gilpin, Grand, Jackson, Jefferson and 3 more | 18 hr |
| Aug 3, 8:10 AM MDT | Areal Flood Advisory | BOU | Grand | 3 hr |
| Aug 3, 2:22 PM MDT | Areal Flood Advisory | BOU | Douglas, Jefferson | 113 min |
| Aug 3, 3:48 PM MDT | Areal Flood Advisory | BOU | Adams, Arapahoe, Elbert | 87 min |
| Aug 3, 4:05 PM MDT | Flash Flood Warning | BOU | Adams, Arapahoe | 115 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.