Alert archive / Wyoming / Flash Flood Warnings in 2012

Flash Flood Warning 11, NWS Cheyenne, WY

July 5, 2012Albany County, Wyoming

NWS Cheyenne, WY issued this flash flood warning at Jul 5, 2012, 5:02 PM MDT for Albany County, Wyoming. It was in force for 5 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: Jul 5, 2012, 5:02 PM MDT (23:02 UTC)
Expired: Jul 5, 2012, 9:52 PM MDT
In force: 5 hr
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Flood severity: None

County Albany County, WY

The radar

The Cheyenne radar (KCYS), 131 km from the middle of the area, began a volume at 23:03 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

Time	Report	Where	Remark
Jul 5, 5:12 PM MDT	FLASH FLOOD	11 S Esterbrook, WY	FLOODING OBSERVED ALONG COTTONWOOD CREEK BY FIRE OFFICIALS AT THE ARAPAHO BURN SITE.

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

The nearest sounding before it

Riverton, WY (KRIW), launched 12:00Z, 11.0 hours before the alert went out and 259 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 34 J/kg
Mixed-layer CIN: -190 J/kg
Mixed-layer LCL: 2588 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 73 m²/s²
0-3 km storm-relative helicity: 102 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.

674 
WGUS55 KCYS 052302
FFWCYS
WYC001-060500-
/O.NEW.KCYS.FF.W.0011.120705T2302Z-120706T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
502 PM MDT THU JUL 5 2012

THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN ALBANY COUNTY IN SOUTHEAST WYOMING...

* UNTIL 1100 PM MDT

* AT 458 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE      
  WARNED AREA. RADAR ESTIMATED RAINFALL OF ONE TO ONE AND HALF       
  INCHES HAS FALLEN OVER THE ARAPAHO FIRE SITE.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...     
  THE ARAPAHO FIRE SITE...FRIEND PARK CAMPGROUND...GARRETT AND       
  LARAMIE PEAK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL 
CREEKS AND STREAMS OVER THE ARAPAHO FIRE SITE.

LAT...LON 4225 10560 4229 10542 4229 10538 4230 10537
      4232 10529 4212 10529 4205 10561

$$

HAHN

3 follow-up statements

551 
WGUS75 KCYS 052317
FFSCYS

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
517 PM MDT THU JUL 5 2012

WYC001-060500-
/O.CON.KCYS.FF.W.0011.000000T0000Z-120706T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ALBANY WY-
517 PM MDT THU JUL 5 2012

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR NORTHEASTERN ALBANY
COUNTY UNTIL 1100 PM MDT...

AT 514 PM MDT...OFFICIALS AT THE ARAPAHO FIRE REPORTED THAT FLASH 
FLOODING WAS OCCURRING ALONG COTTONWOOD CREEK WITHIN THE PERIMETER 
OF THE ARAPAHO FIRE SITE.

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...ARAPAHO FIRE 
SITE...FRIEND PARK CAMPGROUND...GARRETT AND LARAMIE PEAK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL 
CREEKS AND STREAMS...INCLUDING COTTONWOOD CREEK WITHIN THE ARAPAHO 
FIRE SITE.

&&

LAT...LON 4225 10560 4229 10542 4229 10538 4230 10537
      4232 10529 4212 10529 4205 10561

$$

HAHN

558 
WGUS75 KCYS 060136
FFSCYS

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
736 PM MDT THU JUL 5 2012

WYC001-060500-
/O.CON.KCYS.FF.W.0011.000000T0000Z-120706T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ALBANY WY-
736 PM MDT THU JUL 5 2012

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR NORTHEASTERN ALBANY
COUNTY UNTIL 1100 PM MDT...

AT 733 PM MDT...DOPPLER RADAR INDICATED ANOTHER AREA OF 
THUNDERSTORMS WILL MOVE THROUGH THE ARAPAHO FIRE SITE. OFFICIALS AT 
THE ARAPAHO FIRE SITE PREVIOUSLY REPORTED FLOODING ALONG COTTONWOOD 
CREEK IN COTTONWOOD CANYON FROM EARLIER THUNDERSTORMS. ADDITIONAL 
RAINFALL OF ONE HALF INCH TO ONE INCH WILL BE POSSIBLE THROUGH 9 PM.

RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO 
OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... THE 
ARAPAHO FIRE SITE...FRIEND PARK CAMPGROUND...GARRETT AND LARAMIE 
PEAK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL 
CREEKS AND STREAMS...INCLUDING COTTONWOOD CREEK WITHIN THE ARAPAHO 
FIRE SITE.

&&

LAT...LON 4225 10560 4229 10542 4229 10538 4230 10537
      4232 10529 4212 10529 4205 10561

$$

HAHN

078 
WGUS75 KCYS 060352
FFSCYS

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
952 PM MDT THU JUL 5 2012

WYC001-060406-
/O.CAN.KCYS.FF.W.0011.000000T0000Z-120706T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ALBANY WY-
952 PM MDT THU JUL 5 2012

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR NORTHEASTERN ALBANY
COUNTY IS CANCELLED...

EXCESS RUNOFF FROM HEAVY RAIN HAS ENDED OVER THE WARNED AREA. STREAMS
AND CREEKS IN THE WARNED AREA HAVE RECEDED OR WERE BEGINNING TO
RECEDE...ENDING THE FLOOD THREAT. IF FLOODING HAS BEEN OBSERVED... 
PLEASE REPORT IT TO YOUR LOCAL LAW ENFORCEMENT AGENCY OR THE 
NATIONAL WEATHER SERVICE OFFICE IN CHEYENNE.

&&

LAT...LON 4225 10560 4229 10542 4229 10538 4230 10537
      4232 10529 4212 10529 4205 10561

$$

HAHN

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 4, 8:43 PM MDT	Special Weather Statement	CYS	Albany	32 min
Jul 4, 8:52 PM MDT	Severe Thunderstorm Warning	CYS	Albany	20 min
Jul 4, 9:23 PM MDT	Special Weather Statement	CYS	Albany	37 min
Jul 5, 2:44 PM MDT	Special Weather Statement	CYS	Albany	31 min
Jul 5, 2:50 PM MDT	Special Weather Statement	CYS		25 min
Jul 5, 3:01 PM MDT	Special Weather Statement	CYS	Converse	29 min
Jul 5, 3:02 PM MDT	Special Weather Statement	CYS	Converse	28 min
Jul 5, 3:11 PM MDT	Severe Thunderstorm Warning	CYS	Converse	39 min
Jul 5, 3:21 PM MDT	Special Weather Statement	CYS		24 min
Jul 5, 3:48 PM MDT	Special Weather Statement	CYS	Platte	42 min
Jul 5, 3:55 PM MDT	Severe Thunderstorm Warning	CYS	Albany, Converse	50 min
Jul 5, 4:01 PM MDT	Special Weather Statement	CYS	Converse	44 min
Jul 5, 4:39 PM MDT	Severe Thunderstorm Warning	CYS	Albany, Platte	51 min
Jul 5, 4:47 PM MDT	Severe Thunderstorm Warning	CYS	Albany, Converse, Platte	43 min
Jul 5, 5:26 PM MDT	Special Weather Statement	CYS	Platte	49 min
Jul 5, 5:44 PM MDT	Severe Thunderstorm Warning	CYS	Converse, Niobrara, Platte	46 min

Nearby

Flash Flood Warnings in Wyoming, 2012 Every flash flood warning in 2012

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.