Alert archive / Colorado / Flash Flood Warnings in 2019
Flash Flood Warning 13, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this flash flood warning at Aug 20, 2019, 7:10 PM MDT for Adams 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 20, 2019, 7:10 PM MDT (01:10 UTC)
- Expired
- Aug 20, 2019, 9:15 PM MDT
- In force
- 2 hr
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Flood severity
- None
County Adams County, CO
The radar
The Denver radar (KFTG), 24 km from the middle of the area, began a volume at 01:13 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 00:00Z, 1.2 hours before the alert went out and 92 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
- 358 J/kg
- Mixed-layer CIN
- -3 J/kg
- Mixed-layer LCL
- 3844 m above ground
- 0-6 km bulk shear
- 10 kt
- 0-1 km storm-relative helicity
- -51 m²/s²
- 0-3 km storm-relative helicity
- -24 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.3
The text
As transmitted.
689 WGUS55 KBOU 210110 FFWBOU COC001-210315- /O.NEW.KBOU.FF.W.0013.190821T0110Z-190821T0315Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED Flash Flood Warning National Weather Service Denver CO 710 PM MDT Tue Aug 20 2019 The National Weather Service in Denver Colorado has issued a * Flash Flood Warning for... Central Adams County in northeastern Colorado... * Until 915 PM MDT. * At 708 PM MDT, Doppler radar indicated thunderstorms producing torrential rain across the warned area, centered about 12 miles north of Strasburg. Up to three inches of rain have already fallen. Flash flooding is expected to begin shortly. * Flash flooding will remain over mainly rural areas of central Adams County. PRECAUTIONARY/PREPAREDNESS ACTIONS... Excessive runoff from heavy rainfall will cause flooding of small creeks and streams, country roads, farmland, and other low lying spots. && LAT...LON 3986 10435 3996 10433 3996 10425 3987 10425 $$ BARJENBRUCH
2 follow-up statements
565 WGUS75 KBOU 210154 FFSBOU Flash Flood Statement National Weather Service Denver CO 754 PM MDT Tue Aug 20 2019 COC001-210315- /O.CON.KBOU.FF.W.0013.000000T0000Z-190821T0315Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Adams CO- 754 PM MDT Tue Aug 20 2019 ...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 915 PM MDT FOR CENTRAL ADAMS COUNTY... At 753 PM MDT, Doppler radar indicated that heavy rain had ended. Radar estimated between 2 and 3.5 inches of rain had fallen in a short period of time earlier this evening. Flash flooding is expected to be ongoing. Flash flooding will remain over mainly rural areas of central Adams County. This includes the following streams and drainages... Comanche Creek, Wolf Creek, Kiowa Creek, Lost Creek and Mule Creek. PRECAUTIONARY/PREPAREDNESS ACTIONS... Be especially cautious at night when it is harder to recognize the dangers of flooding. Excessive runoff from heavy rainfall will cause flooding of small creeks and streams, country roads, farmland, and other low lying spots. && LAT...LON 3986 10435 3996 10433 3996 10425 3987 10425 $$ BARJENBRUCH
139 WGUS75 KBOU 210316 FFSBOU Flash Flood Statement National Weather Service Denver CO 916 PM MDT Tue Aug 20 2019 COC001-210323- /O.EXP.KBOU.FF.W.0013.000000T0000Z-190821T0315Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Adams CO- 916 PM MDT Tue Aug 20 2019 ...THE FLASH FLOOD WARNING FOR CENTRAL ADAMS COUNTY WILL EXPIRE AT 915 PM MDT... The heavy rain has ended. Flooding is no longer expected to pose a threat. Please continue to heed any remaining road closures. LAT...LON 3986 10435 3996 10433 3996 10425 3987 10425 $$ RJK
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 20, 6:30 PM MDT | Severe Thunderstorm Warning | BOU | Adams | 45 min |
| Aug 21, 12:04 AM MDT | Special Weather Statement | BOU | Logan, Phillips, Sedgwick, Weld | 41 min |
| Aug 21, 4:50 PM MDT | Areal Flood Advisory | BOU | Boulder | 115 min |
Nearby
Flash Flood Warnings in Colorado, 2019Every flash flood warning in 2019
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.