Alert archive / Colorado / Flash Flood Warnings in 2021
Flash Flood Warning 2, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this flash flood warning at May 31, 2021, 3:36 PM MDT for Grand County, Colorado. It was in force for 84 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
- May 31, 2021, 3:36 PM MDT (21:36 UTC)
- Expired
- May 31, 2021, 5:00 PM MDT
- In force
- 84 min
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Flood severity
- None
County Grand County, CO
The radar
The Denver radar (KFTG), 126 km from the middle of the area, began a volume at 21:36 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
Grand Junction, CO (KGJT), launched 12:00Z, 9.6 hours before the alert went out and 227 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
- 1713 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 5 m²/s²
- 0-3 km storm-relative helicity
- 20 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
176
WGUS55 KBOU 312136
FFWBOU
COC049-312300-
/O.NEW.KBOU.FF.W.0002.210531T2136Z-210531T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Denver CO
336 PM MDT Mon May 31 2021
The National Weather Service in Denver has issued a
* Flash Flood Warning for...
South Central Grand County in north central Colorado...
* Until 500 PM MDT.
* At 336 PM MDT, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 0.5 and 1 inch of rain
has 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. Expect
flooding along Darling and Kinney Creek
* Some locations that will experience flash flooding include...
mainly rural areas of South Central Grand County
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Heavy Rainfall will cause minor flooding of small creeks, streams,
and ditches in the Williams Fork burn area. The heavy rains could
also trigger rock slides or debris flows.
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3985 10607 3988 10598 3977 10593 3979 10603
FLASH FLOOD...RADAR INDICATED
$$
Entrekin1 follow-up statement
439 WGUS75 KBOU 312253 FFSBOU Flash Flood Statement National Weather Service Denver CO 453 PM MDT Mon May 31 2021 COC049-312303- /O.EXP.KBOU.FF.W.0002.000000T0000Z-210531T2300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Grand CO- 453 PM MDT Mon May 31 2021 ...FLASH FLOOD WARNING WILL EXPIRE AT 5 PM MDT THIS AFTERNOON FOR SOUTH CENTRAL GRAND COUNTY... The heavy rain has ended. Flooding is no longer expected to pose a threat. Please continue to heed remaining road closures. Expect additional light rain showers through the early evening, but flooding impacts will be very low. LAT...LON 3985 10607 3988 10598 3977 10593 3979 10603 $$ Entrekin
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.