Alert archive / Colorado / Flash Flood Warnings in 2015
Flash Flood Warning 7, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this flash flood warning at May 23, 2015, 3:35 PM MDT for Morgan 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
- May 23, 2015, 3:35 PM MDT (21:35 UTC)
- Expired
- May 23, 2015, 6:30 PM MDT
- In force
- 3 hr
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Flood severity
- None
County Morgan County, CO
The radar
The Denver radar (KFTG), 75 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
Denver, CO (KDEN), launched 12:00Z, 9.6 hours before the alert went out and 67 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
- 1 J/kg
- Mixed-layer CIN
- -241 J/kg
- Mixed-layer LCL
- 762 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- -18 m²/s²
- 0-3 km storm-relative helicity
- 67 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
243
WGUS55 KBOU 232135
FFWBOU
COC087-240030-
/O.NEW.KBOU.FF.W.0007.150523T2135Z-150524T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DENVER CO
335 PM MDT SAT MAY 23 2015
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A
* FLASH FLOOD WARNING FOR...
MORGAN COUNTY IN NORTHEASTERN COLORADO...
* UNTIL 630 PM MDT
* AT 331 PM MDT...DOPPLER RADAR INDICATED A THUNDERSTORM PRODUCING
HEAVY RAIN NEAR LOG LANE VILLAGE. THE RAIN IS MOVING NORTH-
NORTHEAST AT 20 MPH. THERE IS ALSO AN AREA OF THUNDERSTORMS WITH
MODERATE TO HEAVY RAIN DEVELOPING UPSTREAM OF MORGAN COUNTY.
* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
FORT MORGAN...BRUSH...WIGGINS...LOG LANE VILLAGE...HILLROSE...
GOODRICH...ADENA SCHOOL...ORCHARD...ANTELOPE SPRINGS...TWELVE-MILE
CORNER...JACKSON RESERVOIR...GARY...SNYDER AND WELDONA.
* RADAR RAINFALL ESTIMATES INDICATE THAT 0.5 TO 1.5 INCHES OF RAIN
HAVE FALLEN OVER SOUTHWESTERN AND CENTRAL PORTIONS OF MORGAN
COUNTY. MORE RAIN IS EXPECTED.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE.
&&
LAT...LON 4002 10413 4051 10412 4051 10347 4002 10349
$$
RJK2 follow-up statements
854 WGUS75 KBOU 232252 FFSBOU FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE DENVER CO 452 PM MDT SAT MAY 23 2015 COC087-240030- /O.CON.KBOU.FF.W.0007.000000T0000Z-150524T0030Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ MORGAN CO- 452 PM MDT SAT MAY 23 2015 ...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 630 PM MDT FOR MORGAN COUNTY... AT 445 PM MDT...MODERATE RAINFALL WAS STILL FALLING ACROSS THE NORTH TWO-THIRDS OF MORGAN COUNTY. THE SHOWERS AND THUNDERSTORMS PRODUCING THE RAINFALL WERE MOVING NORTHWARD AT 20 MPH. RADAR ESTIMATES INDICTED THAT 0.5 TO 2.0 INCHES OF RAIN HAVE FALL OVER MUCH OF MORGAN SINCE ABOUT 2:45 PM MDT. THERE HAVE BEEN NO REPORTS OF FLOOD THUS FAR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... FORT MORGAN...BRUSH...WIGGINS...LOG LANE VILLAGE...HILLROSE... GOODRICH...ADENA SCHOOL...ORCHARD...ANTELOPE SPRINGS...TWELVE-MILE CORNER...JACKSON RESERVOIR...GARY...SNYDER AND WELDONA. PRECAUTIONARY/PREPAREDNESS ACTIONS... MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE. EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY... COUNTRY ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND OTHER LOW LYING AREAS ARE SUBJECT TO FLOODING. && LAT...LON 4002 10413 4051 10412 4051 10347 4002 10349 $$ RJK
305 WGUS75 KBOU 240028 FFSBOU FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE DENVER CO 628 PM MDT SAT MAY 23 2015 COC087-240037- /O.EXP.KBOU.FF.W.0007.000000T0000Z-150524T0030Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ MORGAN CO- 628 PM MDT SAT MAY 23 2015 ...THE FLASH FLOOD WARNING FOR MORGAN COUNTY WILL EXPIRE AT 630 PM MDT... THE RAIN HAS ENDED...AND FLOODING IS NO LONGER EXPECTED TO POSE A THREAT. PLEASE CONTINUE TO HEED ALL ROAD CLOSURES. LAT...LON 4002 10413 4051 10412 4051 10347 4002 10349 $$ RJK
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 22, 6:08 PM MDT | Special Weather Statement | BOU | Lincoln | 37 min |
| May 22, 7:37 PM MDT | Special Weather Statement | BOU | Crowley | 38 min |
| May 23, 5:41 AM MDT | Flash Flood Watch | BOU | Adams, Arapahoe, Elbert, Lincoln, Logan, Morgan and 4 more | 18 hr |
| May 23, 1:38 PM MDT | Areal Flood Advisory | BOU | Adams, Broomfield, Denver, Jefferson | 2 hr |
| May 23, 2:36 PM MDT | Severe Thunderstorm Warning | BOU | Adams, Arapahoe | 24 min |
| May 23, 5:38 PM MDT | Areal Flood Advisory | BOU | Logan | 2 hr |
Nearby
Flash Flood Warnings in Colorado, 2015Every flash flood warning in 2015
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.