Alert archive / Colorado / Flash Flood Warnings in 2012
Flash Flood Warning 26, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this flash flood warning at Sep 26, 2012, 5:46 PM MDT for Weld County, Colorado. It was in force for 2 hr. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Sep 26, 2012, 5:46 PM MDT (23:46 UTC)
- Expired
- Sep 26, 2012, 7:46 PM MDT
- In force
- 2 hr
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Flood severity
- None
County Weld County, CO
The radar
The Denver radar (KFTG), 56 km from the middle of the area, began a volume at 23:47 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Sep 26, 5:55 PM MDT | FLASH FLOOD | Platteville, CO | 6 INCHES OF WATER RUNNING OVER THE ROAD. AUTOMOBILE SLID INTO A DITCH AND WAS SUBMERGED 4 FEET |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Denver, CO (KDNR), launched 12:00Z, 11.8 hours before the alert went out and 141 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
- 26 J/kg
- Mixed-layer CIN
- -27 J/kg
- Mixed-layer LCL
- 687 m above ground
- 0-6 km bulk shear
- 13 kt
- 0-1 km storm-relative helicity
- 17 m²/s²
- 0-3 km storm-relative helicity
- 39 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
330 WGUS55 KBOU 262346 FFWBOU COC123-270245- /O.NEW.KBOU.FF.W.0026.120926T2346Z-120927T0245Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE DENVER CO 546 PM MDT WED SEP 26 2012 THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A * FLASH FLOOD WARNING FOR... SOUTHWESTERN WELD COUNTY IN NORTHEAST COLORADO * UNTIL 845 PM MDT * AT 544 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY RAIN FROM A THUNDERSTORM OVER PLATTEVILLE...OR 14 MILES SOUTH OF GREELEY. THIS STORM WAS NEARLY STATIONARY. * LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO PLATTEVILLE. DOPPLER RADAR ESTIMATES THAT AROUND 2 INCHES OF RAIN HAS FALLEN FROM THIS STORM IN THE LAST 45 MINUTES. ANOTHER 1 TO 2 INCHES OF RAIN CAN BE EXPECTED BEFORE THE STORM WEAKENS. PRECAUTIONARY/PREPAREDNESS ACTIONS... EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF SMALL CREEKS AND STREAMS...COUNTRY ROADS...NORMALLY DRY WASHES AND ARROYOS...AS WELL AS FARMLAND ALONG THE BANKS OF CREEKS AND STREAMS. DO NOT DRIVE INTO AREAS WHERE WATER COVERS THE ROAD. TURN AROUND... DONT DROWN. && LAT...LON 4029 10483 4027 10475 4016 10479 4020 10487 $$ BARJENBRUCH
2 follow-up statements
582 WGUS75 KBOU 270033 FFSBOU FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE DENVER CO 633 PM MDT WED SEP 26 2012 COC123-270245- /O.CON.KBOU.FF.W.0026.000000T0000Z-120927T0245Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ WELD CO- 633 PM MDT WED SEP 26 2012 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 845 PM MDT FOR SOUTHWESTERN WELD COUNTY... AT 630 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THAT THE EXTREMELY HEAVY RAIN OVER PLATTEVILLE...OR ABOUT 14 MILES SOUTH OF GREELEY....HAD ENDED. LOCATIONS REMAINING IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO PLATTEVILLE. DOPPLER RADAR ESTIMATES THAT 2 TO 3 INCHES OF RAIN HAD FALLEN FROM THE STORMS EARLIER THIS EVENING. THE WELD COUNTY SHERIFF REPORTED CONSIDERABLE STREET FLOODING IN PLATTEVILLE. PRECAUTIONARY/PREPAREDNESS ACTIONS... EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF SMALL CREEKS AND STREAMS...HIGHWAYS...CITY STREETS AND UNDERPASSES. ADDITIONALLY...COUNTRY ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS AND STREAMS AND OTHER LOW LYING AREAS ARE SUBJECT TO FLASH FLOODING. && LAT...LON 4029 10483 4027 10475 4016 10479 4020 10487 $$ BARJENBRUCH
813 WGUS75 KBOU 270146 FFSBOU FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE DENVER CO 746 PM MDT WED SEP 26 2012 COC123-270155- /O.CAN.KBOU.FF.W.0026.000000T0000Z-120927T0245Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ WELD CO- 746 PM MDT WED SEP 26 2012 ...THE FLASH FLOOD WARNING FOR SOUTHWESTERN WELD COUNTY HAS BEEN CANCELLED... THE PLATTEVILLE FIRE DEPARTMENT REPORTED THAT FLOOD WATERS IN THE PLATTEVILLE AREA HAVE SUBSIDED. FLASH FLOODING IS NO LONGER EXPECTED. LAT...LON 4029 10483 4027 10475 4016 10479 4020 10487 $$ BARJENBRUCH
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 26, 4:33 PM MDT | Severe Thunderstorm Warning | BOU | Larimer, Weld | 33 min |
| Sep 26, 5:57 PM MDT | Areal Flood Advisory | BOU | Weld | 93 min |
Nearby
Flash Flood Warnings in Colorado, 2012Every flash flood warning in 2012
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.