Alert archive / Colorado / Areal Flood Advisories in 2021
Areal Flood Advisory 21, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this areal flood advisory at Jun 5, 2021, 2:43 PM MDT for Grand County, Colorado. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 5, 2021, 2:43 PM MDT (20:43 UTC)
- Expired
- Jun 5, 2021, 4:45 PM MDT
- In force
- 2 hr
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
County Grand County, CO
The radar
The Denver radar (KFTG), 125 km from the middle of the area, began a volume at 20:46 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, 8.7 hours before the alert went out and 229 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
- 3490 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 94 m²/s²
- 0-3 km storm-relative helicity
- 91 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
416
WGUS85 KBOU 052043
FLSBOU
Flood Advisory
National Weather Service Denver CO
243 PM MDT Sat Jun 5 2021
COC049-052245-
/O.NEW.KBOU.FA.Y.0021.210605T2043Z-210605T2245Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Grand CO-
243 PM MDT Sat Jun 5 2021
The National Weather Service in Denver has issued a
* Small Stream Flood Advisory for...
South Central Grand County in north central Colorado...
* Until 445 PM MDT.
* At 243 PM MDT, Doppler radar indicated heavy rain due to
thunderstorms. This will cause small stream flooding. Between 0.2
and 0.5 inches of rain have fallen.
* Some locations that will experience flooding include...
mainly rural areas of South Central Grand County, including"
Kinney Creek and County Road 302 in the Williams Fork Burn Area.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
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.
&&
LAT...LON 3989 10602 3991 10601 3991 10599 3988 10596
3983 10597 3981 10604 3982 10606
$$
RJK1 follow-up statement
188
WGUS85 KBOU 052237
FLSBOU
Flood Advisory
National Weather Service Denver CO
437 PM MDT Sat Jun 5 2021
COC049-052247-
/O.EXP.KBOU.FA.Y.0021.000000T0000Z-210605T2245Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Grand CO-
437 PM MDT Sat Jun 5 2021
...THE SMALL STREAM FLOOD ADVISORY WILL EXPIRE AT 445 PM MDT THIS
AFTERNOON FOR SOUTH CENTRAL GRAND COUNTY...
The rain has ended. Small stream flooding is no longer expected to
pose a threat. Please continue to heed remaining road closures.
LAT...LON 3989 10602 3991 10601 3991 10599 3988 10596
3983 10597 3981 10604 3982 10606
$$
RJKThe office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 5, 12:28 PM MDT | Flash Flood Warning | BOU | Larimer | 98 min |
| Jun 5, 1:29 PM MDT | Areal Flood Advisory | BOU | Grand | 109 min |
| Jun 5, 1:59 PM MDT | Flash Flood Warning | BOU | Grand | 78 min |
Nearby
Areal Flood Advisories in Colorado, 2021Every areal flood advisory 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.