Alert archive / Colorado / Flash Flood Warnings in 2018

Flash Flood Warning 7, NWS Pueblo, CO

July 15, 2018Huerfano County, Colorado

NWS Pueblo, CO issued this flash flood warning at Jul 15, 2018, 11:44 PM MDT for Huerfano 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
Jul 15, 2018, 11:44 PM MDT (05:44 UTC)
Expired
Jul 16, 2018, 2:45 AM MDT
In force
3 hr
Issued by
NWS Pueblo, CO
Area
Storm-based polygon
Flood severity
None

County Huerfano County, CO

The radar

The Pueblo radar (KPUX), 118 km from the middle of the area, began a volume at 05:46 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 00:00Z, 5.7 hours before the alert went out and 294 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 2018-07-16Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 387 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 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 2018-07-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 31 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
387 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
598 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
31 m²/s²
0-3 km storm-relative helicity
140 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

Open this sounding in Storm Lab

The text

As transmitted.

550 
WGUS55 KPUB 160544
FFWPUB
COC055-160845-
/O.NEW.KPUB.FF.W.0007.180716T0544Z-180716T0845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Pueblo CO
1144 PM MDT SUN JUL 15 2018

The National Weather Service in Pueblo has issued a

* Flash Flood Warning for...
  Central Huerfano County in southeastern Colorado...

* Until 245 AM MDT.

* At 1141 PM MDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the northeast section of the Spring burn scar. 
  Flash flooding and debris flows is expected to begin shortly.

* Flash flooding will remain over mainly rural areas of central 
  Huerfano County. Excessive rainfall over the burn scar will result 
  in debris flows. The heaviest rain over the burn scar was 
  occurring north of highway 160.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, country roads, farmland, and other low lying
spots.

Move away from recently burned areas. Life-threatening flooding of
creeks, roads and normally dry arroyos is likely. The heavy rains
will likely trigger rockslides, mudslides and debris flows in steep
terrain, especially in and around these areas.

&&

LAT...LON 3767 10495 3756 10497 3755 10509 3769 10513

$$

Hodanish
1 follow-up statement
715 
WGUS75 KPUB 160631
FFSPUB

Flash Flood Statement
National Weather Service Pueblo CO
1231 AM MDT MON JUL 16 2018

COC055-160845-
/O.CON.KPUB.FF.W.0007.000000T0000Z-180716T0845Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Huerfano CO-
1231 AM MDT MON JUL 16 2018

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 245 AM MDT FOR
CENTRAL HUERFANO COUNTY...

At 1225 AM MDT, Doppler radar indicated thunderstorms producing 
heavy rain across the warned area, especially north of Highway 
160.  Flash flooding is expected. 

Excessive rainfall over northeastern and eastern sections of the 
Spring burn scar will result in debris flow moving through the Dog 
Springs Arroyo and North Abeyta Creek Drainages. The debris flow can 
consist of rock, mud, vegetation and other loose materials.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.

Excessive runoff from heavy rainfall will cause flooding of small
creeks and streams, urban areas, highways, streets and underpasses as
well as other drainage areas and low lying spots.

Remain alert for flooding even in locations not receiving rain.
Arroyos, streams, and rivers can become raging killer currents in a
matter of minutes, even from distant rainfall.

Move away from recently burned areas. Life-threatening flooding of
creeks, roads and normally dry arroyos is likely. The heavy rains
will likely trigger rockslides, mudslides and debris flows in steep
terrain, especially in and around these areas.

&&

LAT...LON 3767 10495 3756 10497 3755 10509 3769 10513

$$

The office that day

Everything else NWS Pueblo, CO issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 15, 10:48 PM MDTAreal Flood AdvisoryPUBPueblo117 min
Jul 16, 12:49 AM MDTAreal Flood AdvisoryPUBHuerfano, Las Animas3 hr
Jul 16, 1:41 AM MDTSpecial Weather StatementPUBEl Paso94 min
Jul 16, 1:56 AM MDTFlash Flood WarningPUBCostilla, Huerfano3 hr
Jul 16, 3:40 AM MDTAreal Flood AdvisoryPUBPueblo2 hr

Nearby

Flash Flood Warnings in Colorado, 2018Every flash flood warning in 2018

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.