Alert archive / Colorado / Flash Flood Warnings in 2013
Flash Flood Warning 21, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this flash flood warning at Aug 22, 2013, 4:12 PM MDT for Douglas 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 22, 2013, 4:12 PM MDT (22:12 UTC)
- Expired
- Aug 22, 2013, 6:45 PM MDT
- In force
- 3 hr
- Issued by
- NWS Denver/Boulder, CO
- Area
- Storm-based polygon
- Flood severity
- None
County Douglas County, CO
The radar
The Denver radar (KFTG), 58 km from the middle of the area, began a volume at 22:15 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, 10.2 hours before the alert went out and 152 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
- 994 J/kg
- Mixed-layer CIN
- -200 J/kg
- Mixed-layer LCL
- 831 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 6 m²/s²
- 0-3 km storm-relative helicity
- -4 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
167
WGUS55 KBOU 222212
FFWBOU
COC035-230045-
/O.NEW.KBOU.FF.W.0021.130822T2212Z-130823T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DENVER CO
412 PM MDT THU AUG 22 2013
THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A
* FLASH FLOOD WARNING FOR...
EASTERN DOUGLAS COUNTY IN NORTHEAST COLORADO...
* UNTIL 645 PM MDT
* AT 408 PM MDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING
HEAVY RAIN ACROSS THE WARNED AREA. TWO TO 3 INCHES OF RAIN HAS
FALLEN IN THIS AREA. IF IT HAS NOT DEVELOPED YET...FLASH FLOODING
IS EXPECTED TO BEGIN SHORTLY.
* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
CASTLE ROCK...LARKSPUR AND THE PINERY.
ADDITIONAL RAINFALL AMOUNTS OF 1 TO 1.5 INCHES ARE POSSIBLE IN THE
WARNED AREA.
PLUM CREEK IN CENTRAL DOUGLAS COUNTY WILL BE MOST PRONE TO FLASH
FLOODING.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE. DO NOT
DRIVE THROUGH HIGH WATER. TURN AROUND AND DON'T DROWN.
&&
LAT...LON 3923 10494 3934 10494 3945 10488 3945 10478
3931 10474 3923 10478
$$
BAKER2 follow-up statements
138
WGUS75 KBOU 222325
FFSBOU
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
525 PM MDT THU AUG 22 2013
COC035-230045-
/O.CON.KBOU.FF.W.0021.000000T0000Z-130823T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DOUGLAS CO-
525 PM MDT THU AUG 22 2013
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 645 PM MDT FOR
EASTERN DOUGLAS COUNTY...
AT 517 PM MDT...LOCAL LAW ENFORCEMENT REPORTED FLOOD WATERS COVERING
MANY ROADS IN CENTRAL DOUGLAS COUNTY. EARLIER THIS AFTERNOON
INTERSTATE 25 NEAR THE TOMAH EXIT SOUTH OF CASTLE ROCK CLOSED DUE TO
FLOOD WATERS.
HEAVY RAINFALL HAS GENERALLY ENDED IN THE AREA COVERED BY THIS
WARNING AND THUNDERSTORMS PRODUCING THE TORRENTIAL RAINFALL EARLIER
THIS AFTERNOON HAVE MOVED OUT OF THE AREA.
DOPPLER RADAR ESTIMATES THAT 2 TO 3 INCHES OF RAIN FELL ON PORTIONS
OF CENTRAL DOUGLAS COUNTY CENTERED ALONG PLUM CREEK BETWEEN 345 PM
AND 5 PM MDT THIS AFTERNOON.
SOME LOCATIONS THAT MAY STILL BE EXPERIENCING FLOODING INCLUDE...
CASTLE ROCK AND SURROUNDING AREAS.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...
COUNTRY ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS...STREAMS AND
OTHER LOW LYING AREAS ARE SUBJECT TO FLOODING.
PLEASE REPORT FLOODING TO YOUR LOCAL LAW ENFORCEMENT AGENCY WHEN YOU
CAN DO SO SAFELY.
&&
LAT...LON 3923 10494 3934 10494 3945 10488 3945 10478
3931 10474 3923 10478
$$
BAKER113
WGUS75 KBOU 230045
FFSBOU
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
645 PM MDT THU AUG 22 2013
COC035-230045-
/O.CON.KBOU.FF.W.0021.000000T0000Z-130823T0045Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DOUGLAS CO-
645 PM MDT THU AUG 22 2013
...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 645 PM MDT FOR
EASTERN DOUGLAS COUNTY...
AT 632 PM MDT...DOPPLER RADAR WAS NO LONGER INDICATING HEAVY RAIN IN
THE AREA COVERED BY THIS WARNING. FURTHERMORE THERE HAS BEEN NO
RECENT REPORTS OF FLASH FLOODING IN THE WARNING AREA DUE TO
TORRENTIAL RAINFALL EARLIER THIS AFTERNOON. THEREFORE THIS WARNING
WILL BE ALLOWED TO EXPIRE AT 645 PM MDT.
EARLIER THIS AFTERNOON LOCAL LAW ENFORCEMENT REPORTED A NUMBER OF
CAR FLOATING IN FLOOD WATERS NEAR THE INTERSECTION OF CHATFIELD
AVENUE AND SHAFFER PARKWAY IN SOUTH CENTRAL JEFFERSON COUNTY. PUBLIC
ALSO REPORTED VEHICLES FLOATING IN HIGH WATER AND DEEP HAIL NEAR KEN
CARYL RANCH IN SOUTHEAST JEFFERSON COUNTY.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
PLEASE REPORT FLOODING TO YOUR LOCAL LAW ENFORCEMENT AGENCY WHEN YOU
CAN DO SO SAFELY.
&&
LAT...LON 3923 10494 3934 10494 3945 10488 3945 10478
3931 10474 3923 10478
$$
BAKERThe office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 21, 6:14 PM MDT | Severe Thunderstorm Warning | BOU | Phillips, Sedgwick | 31 min |
| Aug 21, 6:40 PM MDT | Severe Thunderstorm Warning | BOU | Phillips, Sedgwick | 50 min |
| Aug 21, 7:26 PM MDT | Special Weather Statement | BOU | Adams | 64 min |
| Aug 22, 2:44 PM MDT | Special Weather Statement | BOU | Douglas | 46 min |
| Aug 22, 3:09 PM MDT | Special Weather Statement | BOU | Douglas | 36 min |
| Aug 22, 3:29 PM MDT | Special Weather Statement | BOU | Douglas | 46 min |
| Aug 22, 3:56 PM MDT | Areal Flood Advisory | BOU | Douglas, Elbert | 2 hr |
| Aug 22, 4:06 PM MDT | Severe Thunderstorm Warning | BOU | Douglas | 54 min |
| Aug 22, 4:34 PM MDT | Severe Thunderstorm Warning | BOU | Douglas | 41 min |
| Aug 22, 5:05 PM MDT | Severe Thunderstorm Warning | BOU | Douglas | 25 min |
| Aug 22, 5:45 PM MDT | Areal Flood Advisory | BOU | Arapahoe, Denver, Douglas, Jefferson | 3 hr |
| Aug 22, 5:45 PM MDT | Areal Flood Advisory | BOU | Jefferson | 3 hr |
| Aug 22, 5:45 PM MDT | Severe Thunderstorm Warning | BOU | Arapahoe, Denver, Jefferson | 30 min |
Nearby
Flash Flood Warnings in Colorado, 2013Every flash flood warning in 2013
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.