Alert archive / Colorado / Flash Flood Warnings in 2018
Flash Flood Warning 13, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this flash flood warning at Aug 17, 2018, 6:32 PM MDT for Washington County, Colorado. It was in force for 3 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 17, 2018, 6:32 PM MDT (00:32 UTC)
- Expired
- Aug 17, 2018, 9:30 PM MDT
- In force
- 3 hr
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Flood severity
- None
County Washington County, CO
The radar
The Denver radar (KFTG), 85 km from the middle of the area, began a volume at 00:34 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 (KDEN), launched 00:00Z, 0.5 hours before the alert went out and 29 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
- 785 J/kg
- Mixed-layer CIN
- -50 J/kg
- Mixed-layer LCL
- 1931 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 128 m²/s²
- 0-3 km storm-relative helicity
- 145 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 4.1
The text
As transmitted.
124 WGUS55 KBOU 180032 FFWBOU COC121-180330- /O.NEW.KBOU.FF.W.0013.180818T0032Z-180818T0330Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED Flash Flood Warning National Weather Service Denver CO 632 PM MDT FRI AUG 17 2018 The National Weather Service in Denver Colorado has issued a * Flash Flood Warning for... Southwestern Washington County in northeastern Colorado... * Until 930 PM MDT. * At 632 PM MDT, Doppler radar indicated thunderstorms producing heavy rain across the warned area. Up to three inches of rain have already fallen. Flash flooding is expected to begin shortly. * Some locations that will experience flooding include... Woodlin School, Lindon, Last Chance and Woodrow. 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 3963 10370 4000 10370 4000 10335 3963 10332 $$ RPK
1 follow-up statement
288 WGUS75 KBOU 180329 FFSBOU Flash Flood Statement National Weather Service Denver CO 929 PM MDT FRI AUG 17 2018 COC121-180333- /O.EXP.KBOU.FF.W.0013.000000T0000Z-180818T0330Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Washington CO- 929 PM MDT FRI AUG 17 2018 ...THE FLASH FLOOD WARNING FOR SOUTHWESTERN WASHINGTON COUNTY WILL EXPIRE AT 930 PM MDT... The heavy rain has ended. Flooding is no longer expected to pose a threat. Please continue to heed any remaining road closures. Rainfall amounts of 2 to 3 inches earlier this evening will cause drainages like Plum Bush Creek, Vega Creek and Sand Creek will continue to run at or above bankfull stages through the rest of tonight. Do not try to cross water-covered roads. It may be difficult to tell how deep the water is. LAT...LON 3963 10370 4000 10370 4000 10335 3963 10332 $$ DANKERS
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 17, 7:08 PM MDT | Special Weather Statement | BOU | Elbert | 37 min |
| Aug 17, 7:25 PM MDT | Areal Flood Advisory | BOU | Elbert, Lincoln | 95 min |
| Aug 18, 11:33 AM MDT | Special Weather Statement | BOU | Douglas, Jefferson | 42 min |
| Aug 18, 12:16 PM MDT | Special Weather Statement | BOU | Elbert | 44 min |
| Aug 18, 1:05 PM MDT | Special Weather Statement | BOU | Elbert | 40 min |
| Aug 18, 1:46 PM MDT | Special Weather Statement | BOU | Elbert | 44 min |
Nearby
Flash Flood Warnings in Colorado, 2018Every flash flood warning in 2018
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.