Alert archive / Colorado / Flash Flood Warnings in 2015
Flash Flood Warning 9, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this flash flood warning at May 24, 2015, 11:57 AM MDT for Arapahoe County, Elbert 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 24, 2015, 11:57 AM MDT (17:57 UTC)
- Expired
- May 24, 2015, 3:00 PM MDT
- In force
- 3 hr
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Flood severity
- None
Counties Arapahoe County, CO, Elbert County, CO
The radar
The Denver radar (KFTG), 44 km from the middle of the area, began a volume at 18:01 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, 6.0 hours before the alert went out and 114 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
- 1092 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 4 m²/s²
- 0-3 km storm-relative helicity
- 11 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
086
WGUS55 KBOU 241757
FFWBOU
COC005-039-242100-
/O.NEW.KBOU.FF.W.0009.150524T1757Z-150524T2100Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DENVER CO
1157 AM MDT SUN MAY 24 2015
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A
* FLASH FLOOD WARNING FOR...
NORTHWESTERN ELBERT COUNTY IN EAST CENTRAL COLORADO...
SOUTH CENTRAL ARAPAHOE COUNTY IN NORTHEASTERN COLORADO...
* UNTIL 300 PM MDT
* AT 1156 AM MDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING
HEAVY RAIN OVER NORTHWEST ELBERT COUNTY. THE RAIN IS MOVING
NORTHEAST AT 20 MPH. UP TO THREE INCHES OF RAIN MAY HAVE ALREADY
FALLEN. FLASH FLOODING IS EXPECTED TO BEGIN SHORTLY.
* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
KIOWA.
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...COUNTRY ROADS...AS WELL AS FARMLAND AS WELL AS
OTHER DRAINAGE AREAS AND LOW LYING SPOTS.
&&
LAT...LON 3925 10442 3930 10460 3963 10443 3960 10424
$$
RPK2 follow-up statements
486 WGUS75 KBOU 241841 FFSBOU FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE DENVER CO 1241 PM MDT SUN MAY 24 2015 COC005-039-242100- /O.CON.KBOU.FF.W.0009.000000T0000Z-150524T2100Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ ELBERT CO-ARAPAHOE CO- 1241 PM MDT SUN MAY 24 2015 ...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 300 PM MDT FOR NORTHWESTERN ELBERT AND SOUTH CENTRAL ARAPAHOE COUNTIES... AT 1240 PM MDT...RAIN WAS ENDING OVER NORTHWEST ELBERT COUNTY. UP TO THREE INCHES OF RAIN HAVE ALREADY FALLEN IN A FEW LOCATIONS. FLASH FLOODING IS EXPECTED TO BEGIN SHORTLY. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... KIOWA. PRECAUTIONARY/PREPAREDNESS ACTIONS... MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE. EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS. && LAT...LON 3925 10442 3930 10460 3963 10443 3960 10424 $$ RPK
574 WGUS75 KBOU 242054 FFSBOU FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE DENVER CO 254 PM MDT SUN MAY 24 2015 COC005-039-242103- /O.EXP.KBOU.FF.W.0009.000000T0000Z-150524T2100Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ ELBERT CO-ARAPAHOE CO- 254 PM MDT SUN MAY 24 2015 ...THE FLASH FLOOD WARNING FOR NORTHWESTERN ELBERT AND SOUTH CENTRAL ARAPAHOE COUNTIES WILL EXPIRE AT 300 PM MDT... FLOOD WATERS HAVE RECEDED...AND ARE NO LONGER EXPECTED TO POSE A THREAT TO LIFE OR PROPERTY. PLEASE CONTINUE TO HEED ANY ROAD CLOSURES. LAT...LON 3925 10442 3930 10460 3963 10443 3960 10424 $$ RPK
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 23, 6:27 PM MDT | River Flood Warning | BOU | Logan, Morgan, Washington | 72 hr |
| May 23, 8:18 PM MDT | Areal Flood Advisory | BOU | Logan | 3 hr |
| May 23, 10:20 PM MDT | Flash Flood Warning | BOU | Logan | 5 hr |
| May 24, 2:10 AM MDT | Areal Flood Warning | BOU | Logan | 18 hr |
| May 24, 4:44 AM MDT | Flash Flood Watch | BOU | Adams, Arapahoe, Elbert, Lincoln, Logan, Morgan and 4 more | 14 hr |
| May 24, 11:22 AM MDT | Areal Flood Advisory | BOU | Elbert | 3 hr |
| May 24, 12:08 PM MDT | Special Weather Statement | BOU | Arapahoe | 37 min |
| May 24, 12:15 PM MDT | Tornado Warning | BOU | Arapahoe, Elbert | 15 min |
| May 24, 12:33 PM MDT | Tornado Warning | BOU | Arapahoe, Elbert | 27 min |
| May 24, 1:00 PM MDT | Tornado Warning | BOU | Arapahoe | 18 min |
| May 24, 1:23 PM MDT | Areal Flood Advisory | BOU | Adams, Arapahoe | 3 hr |
| May 24, 1:25 PM MDT | Special Weather Statement | BOU | Adams | 35 min |
| May 24, 2:17 PM MDT | Special Weather Statement | BOU | Washington | 28 min |
| May 24, 2:43 PM MDT | Areal Flood Advisory | BOU | Adams, Morgan, Washington | 3 hr |
| May 24, 3:15 PM MDT | Special Weather Statement | BOU | Washington | 30 min |
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.