Alert archive / Colorado / Flash Flood Warnings in 2014

Flash Flood Warning 3, NWS Denver/Boulder, CO

May 23, 2014Larimer County, Colorado

NWS Denver/Boulder, CO issued this flash flood warning at May 23, 2014, 7:21 PM MDT for Larimer County, Colorado. It was in force for 3 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
May 23, 2014, 7:21 PM MDT (01:21 UTC)
Expired
May 23, 2014, 10:15 PM MDT
In force
3 hr
Issued by
NWS Denver/Boulder, CO
Area
Storm-based polygon
Flood severity
None

County Larimer County, CO

The radar

The Denver radar (KFTG), 84 km from the middle of the area, began a volume at 01:24 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

TimeReportWhereRemark
May 23, 8:41 PM MDTFLASH FLOOD2 W Loveland, CO1 TO 2 FEET OF FLOWING WATER OVER MAJOR INTERSECTIONS OF WEST LOVELAND. TRAINED OBSERVER MEASURED 4.15 INCHES OF RAINFALL IN VICINITY.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Denver, CO (KDEN), launched 00:00Z, 1.4 hours before the alert went out and 171 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.

Skew-T log-pSkew-T log-p diagram, Denver, CO at 00:00Z on 2014-05-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 530 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 00:00Z on 2014-05-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -72 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
530 J/kg
Mixed-layer CIN
-48 J/kg
Mixed-layer LCL
1524 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
-72 m²/s²
0-3 km storm-relative helicity
-15 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

655 
WGUS55 KBOU 240121
FFWBOU
COC069-240415-
/O.NEW.KBOU.FF.W.0003.140524T0121Z-140524T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DENVER CO
721 PM MDT FRI MAY 23 2014

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHEASTERN LARIMER COUNTY IN NORTH CENTRAL COLORADO...

* UNTIL 1015 PM MDT

* AT 717 PM MDT...DOPPLER RADAR AND AUTOMATED RAIN GAUGES INDICATED 
  VERY HEAVY RAIN FALLING OVER SOUTHEAST LARIMER COUNTY JUST TO THE 
  WEST AND NORTHWEST LOVELAND. 2.5 TO 3.5 INCHES OF RAIN HAS FALLEN 
  IN THE PAST HOUR. FLASH FLOODING HAS BEEN REPORTED IN THE AREA.  
  
* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  WESTERN AND NORTHERN LOVELAND.

ADDITIONAL RAINFALL AMOUNTS OF ONE HALF TO THREE QUARTER INCH ARE 
POSSIBLE IN THE WARNED AREA.

THIS INCLUDES THE FOLLOWING STREAMS AND DRAINAGES...BUCKHORN CREEK...
COTTONWOOD CREEK...BIG THOMPSON RIVER AND DRY CREEK.

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.

TURN AROUND...DONT DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

&&

LAT...LON 4035 10511 4036 10517 4048 10516 4048 10505

$$

BAKER
1 follow-up statement
487 
WGUS75 KBOU 240413
FFSBOU

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
1013 PM MDT FRI MAY 23 2014

COC069-240418-
/O.EXP.KBOU.FF.W.0003.000000T0000Z-140524T0415Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LARIMER CO-
1013 PM MDT FRI MAY 23 2014

...THE FLASH FLOOD WARNING FOR SOUTHEASTERN LARIMER COUNTY WILL
EXPIRE AT 1015 PM MDT...

THE HEAVY RAIN HAS DIMINISHED...SO FLASH FLOODING IS NO LONGER A 
THREAT. HOWEVER...THIS FLASH FLOOD WARNING HAS BEEN REPLACED BY AN 
AREAL FLOOD WARNING FOR SOUTHEASTERN LARIMER COUNTY.  

LAT...LON 4035 10511 4036 10517 4048 10516 4048 10505

$$

ENTREKIN

The office that day

Everything else NWS Denver/Boulder, CO issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 23, 6:05 PM MDTAreal Flood AdvisoryBOUAdams, Arapahoe, Denver115 min
May 23, 7:20 PM MDTFlash Flood WarningBOUBoulder3 hr
May 23, 8:10 PM MDTFlash Flood WarningBOULarimer, Weld3 hr
May 23, 9:20 PM MDTAreal Flood AdvisoryBOUWeld4 hr
May 23, 10:06 PM MDTAreal Flood WarningBOULarimer4 hr
May 23, 10:10 PM MDTFlash Flood WarningBOUWeld3 hr
May 23, 10:26 PM MDTAreal Flood AdvisoryBOUAdams, Denver, Weld3 hr
May 23, 11:09 PM MDTAreal Flood AdvisoryBOULarimer96 min
May 24, 5:50 AM MDTFlash Flood WatchBOUAdams, Arapahoe, Boulder, Broomfield, Clear Creek, Denver and 7 more17 hr
May 24, 4:42 PM MDTSpecial Weather StatementBOUGrand33 min
May 24, 5:11 PM MDTSpecial Weather StatementBOUJackson34 min
May 24, 5:37 PM MDTSpecial Weather StatementBOUJefferson23 min
May 24, 5:58 PM MDTSpecial Weather StatementBOUDouglas47 min

Nearby

Flash Flood Warnings in Colorado, 2014Every flash flood warning in 2014

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.