Alert archive / Colorado / Flash Flood Warnings in 2016

Flash Flood Warning 5, NWS Denver/Boulder, CO

July 22, 2016Larimer County, Colorado

NWS Denver/Boulder, CO issued this flash flood warning at Jul 22, 2016, 2:12 PM MDT for Larimer County, Colorado. It was in force for 2 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
Jul 22, 2016, 2:12 PM MDT (20:12 UTC)
Expired
Jul 22, 2016, 4:15 PM MDT
In force
2 hr
Issued by
NWS Denver/Boulder, CO
Area
Storm-based polygon
Flood severity
None

County Larimer County, CO

The radar

The Cheyenne radar (KCYS), 75 km from the middle of the area, began a volume at 20:13 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, 8.2 hours before the alert went out and 204 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 12:00Z on 2016-07-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 12:00Z on 2016-07-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -8 square meters per square second.1939Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2708 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
-8 m²/s²
0-3 km storm-relative helicity
47 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

493 
WGUS55 KBOU 222012
FFWBOU
COC069-222215-
/O.NEW.KBOU.FF.W.0005.160722T2012Z-160722T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DENVER CO
212 PM MDT FRI JUL 22 2016

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  THE HIGH PARK BURN AREA IN CENTRAL LARIMER COUNTY IN NORTH CENTRAL 
  COLORADO...

* UNTIL 415 PM MDT

* AT 210 PM MDT...DOPPLER RADAR INDICATED A THUNDERSTORM PRODUCING
  HEAVY RAIN IN THE SOUTHWEST PART OF THE HIGH PARK BURN AREA. THE
  STORM IS MOVING SLOWLY NORTHEAST. FLASH FLOODING IS EXPECTED TO
  BEGIN SHORTLY.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  POUDRE PARK AND MISHAWAKA. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

HEAVY RAINFALL WILL CAUSE FLASH FLOODING OF CREEKS...STREAMS...ROADS
AND CULVERTS IN THE HIGH PARK BURN AREA. SOME AREAS AFFECTED INCLUDE
RIST CANYON...BUCKHORN CREEK...REDSTONE CANYON...STOVE PRAIRIE...AND
GULCHES DRAINING INTO THE POUDRE CANYON ALONG HIGHWAY 14. ROCK SLIDES
OR DEBRIS FLOWS CAN ALSO BE EXPECTED ACROSS ROADS IN THE BURN AREA.

&&

LAT...LON 4057 10548 4065 10555 4072 10542 4076 10522
      4065 10530

$$
TH
2 follow-up statements
694 
WGUS75 KBOU 222115
FFSBOU

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
315 PM MDT FRI JUL 22 2016

COC069-222215-
/O.CON.KBOU.FF.W.0005.000000T0000Z-160722T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LARIMER CO-
315 PM MDT FRI JUL 22 2016

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 415 PM MDT FOR
CENTRAL LARIMER COUNTY...

AT 312 PM MDT...THE THUNDERSTORM IN THE HIGH PARK BURN AREA WAS
WEAKENING AS IT MOVED EAST OUT OF THE WARNED AREA. UP TO 1.4 INCHES
OF RAIN FELL IN THE SOUTHWEST SECTION OF THE BURN AREA. FLOODING IN
LOW LYING AREAS ALONG BUCKHORN CREEK COULD STILL OCCUR DUE TO
RUNOFF.  

PRECAUTIONARY/PREPAREDNESS ACTIONS...

HEAVY RAINFALL WILL CAUSE FLASH FLOODING OF CREEKS...ROADS AND
CULVERTS IN THE HIGH PARK BURN AREA. SOME AREAS AFFECTED INCLUDE
BUCKHORN CREEK.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...FARMLAND...AND OTHER LOW LYING
SPOTS.

&&

LAT...LON 4057 10548 4065 10555 4072 10542 4076 10522
      4065 10530

$$
TH
890 
WGUS75 KBOU 222130
FFSBOU

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
330 PM MDT FRI JUL 22 2016

COC069-222139-
/O.CAN.KBOU.FF.W.0005.000000T0000Z-160722T2215Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LARIMER CO-
330 PM MDT FRI JUL 22 2016

...THE FLASH FLOOD WARNING FOR THE HIGH PARK BURN AREA IN CENTRAL 
LARIMER COUNTY IS CANCELLED...

THE HEAVY RAIN HAS ENDED. FLOODING IS NO LONGER EXPECTED TO POSE A
THREAT.

LAT...LON 4057 10548 4065 10555 4072 10542 4076 10522
      4065 10530

$$
TH

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 21, 7:56 PM MDTSpecial Weather StatementBOULincoln49 min
Jul 21, 7:58 PM MDTSpecial Weather StatementBOULincoln47 min
Jul 21, 8:46 PM MDTSpecial Weather StatementBOULincoln44 min
Jul 22, 1:52 PM MDTAreal Flood AdvisoryBOUJefferson113 min
Jul 22, 3:08 PM MDTSpecial Weather StatementBOUDouglas52 min
Jul 22, 3:48 PM MDTSpecial Weather StatementBOUArapahoe42 min
Jul 22, 4:13 PM MDTSpecial Weather StatementBOUElbert47 min

Nearby

Flash Flood Warnings in Colorado, 2016Every flash flood warning in 2016

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.