Alert archive / Wyoming / Flash Flood Warnings in 2014

Flash Flood Warning 21, NWS Cheyenne, WY

July 13, 2014Laramie County, Wyoming

NWS Cheyenne, WY issued this flash flood warning at Jul 13, 2014, 1:42 PM MDT for Laramie County, Wyoming. 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: Jul 13, 2014, 1:42 PM MDT (19:42 UTC)
Expired: Jul 13, 2014, 4:30 PM MDT
In force: 3 hr
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Flood severity: None

County Laramie County, WY

The radar

The Cheyenne radar (KCYS), 5 km from the middle of the area, began a volume at 19:43 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 13, 2:00 PM MDT	FLASH FLOOD	Cheyenne, WY	RECEIVED MULTIPLE REPORTS OF 6 TO 12 INCHES OF WATER IN AND AROUND DOWNTOWN CHEYENNE FROM VERY HEAVY RAINFALL. 6 TO 8 INCES OF HAIL ACCUMULATION AS WELL.

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 12:00Z, 7.7 hours before the alert went out and 190 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: 88 J/kg
Mixed-layer CIN: -71 J/kg
Mixed-layer LCL: 1036 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: -1 m²/s²
0-3 km storm-relative helicity: 18 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.

708 
WGUS55 KCYS 131942
FFWCYS
WYC021-132230-
/O.NEW.KCYS.FF.W.0021.140713T1942Z-140713T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
142 PM MDT SUN JUL 13 2014

THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTH CENTRAL LARAMIE COUNTY IN SOUTHEAST WYOMING...

* UNTIL 430 PM MDT

* AT 142 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE      
  WARNED AREA. EXPECT RAINFALL AMOUNTS OF 1 TO 2 INCHES IN LESS THAN
  ONE HOUR. 

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  CHEYENNE...ARCHER EXIT...FRONTIER PARK...NORTH CHEYENNE AND WARREN
  AF BASE.

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.

TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY
YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN
CHEYENNE.

&&

LAT...LON 4124 10497 4129 10462 4100 10451 4100 10452
      4100 10496

$$

RUBIN

2 follow-up statements

165 
WGUS75 KCYS 132115
FFSCYS

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
315 PM MDT SUN JUL 13 2014

WYC021-132230-
/O.CON.KCYS.FF.W.0021.000000T0000Z-140713T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LARAMIE WY-
315 PM MDT SUN JUL 13 2014

...FLASH FLOOD WARNING REMAINS IN EFFECT FOR SOUTH CENTRAL LARAMIE
COUNTY UNTIL 430 PM MDT...

AT 314 PM MDT...DOPPLER RADAR SHOWED NO SHOWERS OR THUNDERSTORMS IN 
THE FLASH FLOOD WARNING AREA.

SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...CHEYENNE...
ARCHER EXIT...FRONTIER PARK...NORTH CHEYENNE AND WARREN AF BASE.

WATER WAS RECEDING IN THE WARNED AREA...THOUGH STILL WITH LOCALIZED 
FLOODING OF LOW LYING AREAS AND CULVERTS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE MINOR FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES
AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.

REPORT FLOODING TO THE NEAREST LAW ENFORCEMENT AGENCY SO THAT THEY
MAY TAKE APPROPRIATE ACTION TO CLOSE FLOODED ROADWAYS. THEY WILL
RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE IN CHEYENNE.

&&

LAT...LON 4124 10497 4129 10462 4100 10451 4100 10452
      4100 10496

$$

RUBIN

329 
WGUS75 KCYS 132225
FFSCYS

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
425 PM MDT SUN JUL 13 2014

WYC021-132239-
/O.EXP.KCYS.FF.W.0021.000000T0000Z-140713T2230Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LARAMIE WY-
425 PM MDT SUN JUL 13 2014

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR SOUTH CENTRAL
LARAMIE COUNTY WILL BE ALLOWED TO EXPIRE AT 430 PM MDT...

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.

CREEKS MAY STILL BE RUNNING HIGH...WHILE WATER MAY STILL BE PONDING 
IN SPOTS...AND NO LONGER POSING A THREAT TO LIFE OR PROPERTY.

LAT...LON 4124 10497 4129 10462 4100 10451 4100 10452
      4100 10496

$$

RUBIN

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 13, 11:43 AM MDT	Special Weather Statement	CYS	Albany	62 min
Jul 13, 11:45 AM MDT	Special Weather Statement	CYS	Platte	60 min
Jul 13, 11:51 AM MDT	Severe Thunderstorm Warning	CYS	Albany, Platte	54 min
Jul 13, 12:29 PM MDT	Severe Thunderstorm Warning	CYS	Albany, Platte	46 min
Jul 13, 12:39 PM MDT	Special Weather Statement	CYS	Laramie	66 min
Jul 13, 12:53 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	67 min
Jul 13, 12:56 PM MDT	Special Weather Statement	CYS	Platte	49 min
Jul 13, 12:58 PM MDT	Special Weather Statement	CYS	Goshen	47 min
Jul 13, 1:11 PM MDT	Severe Thunderstorm Warning	CYS	Laramie, Platte	28 min
Jul 13, 1:22 PM MDT	Tornado Warning	CYS	Laramie	38 min
Jul 13, 1:55 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	27 min
Jul 13, 2:00 PM MDT	Special Weather Statement	CYS	Laramie	60 min
Jul 13, 5:48 PM MDT	Severe Thunderstorm Warning	CYS	Albany, Laramie	42 min

Nearby

Flash Flood Warnings in Wyoming, 2014 Every 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.