Alert archive / Nebraska / Flash Flood Warnings in 2009

Flash Flood Warning 13, NWS Cheyenne, WY

June 29, 2009Dawes County, Nebraska

NWS Cheyenne, WY issued this flash flood warning at Jun 29, 2009, 9:34 PM MDT for Dawes County, Nebraska. It was in force for 68 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Jun 29, 2009, 9:34 PM MDT (03:34 UTC)
Expired
Jun 29, 2009, 10:42 PM MDT
In force
68 min
Issued by
NWS Cheyenne, WY
Area
Storm-based polygon
Flood severity
None

County Dawes County, NE

The radar

The Rapid City radar (KUDX), 158 km from the middle of the area, began a volume at 03:38 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

Rapid City, SD (KUNR), launched 00:00Z, 3.6 hours before the alert went out and 151 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, Rapid City, SD at 00:00Z on 2009-06-30Temperature 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°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Rapid City, SD at 00:00Z on 2009-06-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 72 square meters per square second.193958Sfc1 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
3438 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
72 m²/s²
0-3 km storm-relative helicity
79 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.

000 
WGUS55 KCYS 300334
FFWCYS
NEC045-300630-
/O.NEW.KCYS.FF.W.0013.090630T0334Z-090630T0630Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
934 PM MDT MON JUN 29 2009

THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EASTERN DAWES COUNTY IN THE PANHANDLE OF NEBRASKA

* UNTIL 1230 AM MDT

* AT 925 PM MDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED SOME
  FLASH FLOODING OF STREETS IN THE CHADRON AREA. THUNDERSTORMS       
  WITH HEAVY RAINFALL WILL LINGER ACROSS THE WARNED AREA
  THROUGH 10 PM.  RADAR ESTIMATED ABOUT 2 INCHES OF RAIN HAD FALLEN  
  IN THE CHADRON AREA AS OF 930 PM.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  CHADRON...CHADRON AIRPORT AND DEVILS BACKBONE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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.

&&

LAT...LON 4259 10278 4259 10293 4289 10314 4288 10279

$$
1 follow-up statement
682 
WGUS75 KCYS 300442
FFSCYS

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
1042 PM MDT MON JUN 29 2009

NEC045-300455-
/O.CAN.KCYS.FF.W.0013.000000T0000Z-090630T0630Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
DAWES NE-
1042 PM MDT MON JUN 29 2009

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR EASTERN DAWES
COUNTY IS CANCELLED...

EXCESS RUNOFF FROM HEAVY RAIN HAS ENDED OVER THE WARNED AREA. 
FLOODING ON STREETS IN THE CHADRON AREA HAS ENDED AS OF 1040 PM...
SO THE WARNING HAS BEEN CANCELLED.  IF ANY FLOODING WAS OBSERVED... 
PLEASE REPORT IT TO YOUR LOCAL LAW ENFORCEMENT AGENCY.

LAT...LON 4259 10278 4259 10293 4289 10314 4288 10279

$$

The office that day

Everything else NWS Cheyenne, WY issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 29, 8:23 PM MDTSevere Thunderstorm WarningCYSDawes52 min

Nearby

Flash Flood Warnings in Nebraska, 2009Every flash flood warning in 2009

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.