Alert archive / Wyoming / Flash Flood Warnings in 2000

Flash Flood Warning 6, NWS Cheyenne, WY

August 15, 2000Laramie County, Wyoming

NWS Cheyenne, WY issued this flash flood warning at Aug 15, 2000, 6:45 PM MDT for Laramie County, Wyoming. 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 the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued: Aug 15, 2000, 6:45 PM MDT (00:45 UTC)
Expired: Aug 15, 2000, 9:00 PM MDT
In force: 2 hr
Issued by: NWS Cheyenne, WY
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Laramie County, WY

The radar

The Cheyenne radar (KCYS), 33 km from the middle of the area, began a volume at 00:46 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 (KDNR), launched 00:00Z, 0.8 hours before the alert went out and 228 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: 367 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 2974 m above ground
0-6 km bulk shear: 4 kt
0-1 km storm-relative helicity: 7 m²/s²
0-3 km storm-relative helicity: 58 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 160046
FFWCYS
WYC021-160300-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
645 PM MDT TUE AUG 15 2000

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WESTERN LARAMIE COUNTY IN SOUTHEAST WYOMING

* UNTIL 900 PM MDT

* AT 635 PM MDT...WEATHER SPOTTERS REPORTED FLOODING PROBLEMS AROUND 
  THE COMMUNITY OF FEDERAL. THERE WAS ALSO WATER OVER THE ROAD ALONG 
  PARTS OF HAPPY JACK ROAD IN THE FOOTHILLS OF THE LITTLE            
  LARAMIE RANGE.  DOPPLER RADAR INDICATES 2 TO 3 INCHES OF RAIN      
  HAS ALREADY FALLEN OVER THIS REGION FROM EARLIER STORMS.           
  ANOTHER AREA OF THUNDERSTORMS WILL MOVE ACROSS THE SOUTHERN        
  LARAMIE RANGE THROUGH 830 PM.  AN ADDITIONAL 1 TO 2 INCHES OF RAIN 
  IS POSSIBLE IN THIS AREA WITH ISOLATED HIGHER TOTALS.    

* SOME AREAS IN THIS WARNING INCLUDE FEDERAL AND CURT GOWDY STATE PARK

EXCESSIVE RUNOFF FROM RAINS OVER THE HIGHER TERRAIN WILL CAUSE FLASH 
FLOODING OF CREEKS AND STREAMS...ROADS AND ROADSIDE CULVERTS. THE 
HEAVY RAINS COULD ALSO TRIGGER ROCK AND MUDSLIDES IN STEEP TERRAIN.

MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES. DO NOT DRIVE YOUR
VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. THE WATER
DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. VEHICLES
CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY. MOVE TO HIGHER
GROUND.

TO REPORT SEVERE WEATHElR HAVE THE NEAREST LAW ENFORCEMENT AGENCY
RELAY YOUR REPORT TO THE NEAREST NATIONAL WEATHER SERVICE.

LAT...LON 4160 10526 4100 10523 4102 10480 4161 10481

KEYSOR
WCJIN-WYSE

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 15, 11:45 PM MDT	Flash Flood Warning	CYS	Laramie	2 hr

Nearby

Flash Flood Warnings in Wyoming, 2000 Every flash flood warning in 2000

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.