Alert archive / Wyoming / Flash Flood Warnings in 2002

Flash Flood Warning 2, NWS Cheyenne, WY

July 22, 2002Albany County, Carbon County, Wyoming

NWS Cheyenne, WY issued this flash flood warning at Jul 22, 2002, 6:25 PM MDT for Albany County, Carbon County, Wyoming. It was in force for 4 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 22, 2002, 6:25 PM MDT (00:25 UTC)
Expired: Jul 22, 2002, 10:15 PM MDT
In force: 4 hr
Issued by: NWS Cheyenne, WY
Area: Counties, with a storm outline in the text

Counties Albany County, WY, Carbon County, WY

The nearest sounding before it

Riverton, WY (KRIW), launched 00:00Z, 0.4 hours before the alert went out and 240 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: 1397 J/kg
Mixed-layer CIN: -46 J/kg
Mixed-layer LCL: 2129 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: -8 m²/s²
0-3 km storm-relative helicity: 45 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WGUS55 KCYS 230025 CCA
FFWCYS
WYC001-007-230415-

BULLETIN - EAS ACTIVATION REQUESTED...CORRECTION TO COUNTIES
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
622 PM MDT MON JUL 22 2002

THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EXTREME NORTHWESTERN ALBANY COUNTY IN SOUTHEAST WYOMING
  EXTREME NORTHEAST CARBON COUNTY IN SOUTHEAST WYOMING

* UNTIL 1015 PM MDT

* AT 615 PM MDT...A THUNDERSTORM WITH VERY HEAVY RAINFALL WAS
  15 MILES NORTH OF MEDICINE BOW DRIFTING TO THE SOUTH AT LESS
  THAN 5 MPH.

RADAR ESTIMATED A LEAST FOUR AND A HALF INCHES OF RAIN MAY HAVE 
FALLEN ABOUT 18 MILES NORTH OF THE TOWN OF MEDICINE BOW BETWEEN THE 
LITTLE MEDICINE BOW RIVER AND MUDDY CREEK.  FLASH FLOODING MAY OCCUR 
ALONG BOTH STREAMS.

THE LITTLE MEDICINE BOW RIVER FLOWS UNDER HIGHWAY 487 ABOUT 4 MILES 
NORTH OF THE TOWN OF MEDICINE BOW.  FLASH FLOODING MAY OCCUR ALONG 
HIGHWAY 487 IN THE NEXT TWO TO FOUR HOURS AS THE VERY HEAVY RAINFALL 
REACHES THE AREA.

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...AND NORMALLY DRY WASHES...AS
WELL AS FARMLAND ALONG THE BANKS OF CREEKS AND STREAMS.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE. IF YOUR VEHICLE STALLS, ABANDON IT IMMEDIATELY AND SEEK
HIGHER GROUND.

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

&&

COX

WCJIN-WYSE

LAT...LON 4203 10630 4190 10613 4296 10432 4335 10484

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 22, 6:23 PM MDT	Flash Flood Warning	CYS	Albany, Carbon	4 hr

Nearby

Flash Flood Warnings in Wyoming, 2002 Every flash flood warning in 2002

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.