Alert archive / Wyoming / Flash Flood Warnings in 2003
Flash Flood Warning 1, NWS Cheyenne, WY
NWS Cheyenne, WY issued this flash flood warning at Jul 18, 2003, 4:02 PM MDT for Goshen County, Wyoming. It was in force for 3 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 18, 2003, 4:02 PM MDT (22:02 UTC)
- Expired
- Jul 18, 2003, 7:00 PM MDT
- In force
- 3 hr
- Issued by
- NWS Cheyenne, WY
- Area
- Counties, with a storm outline in the text
County Goshen County, WY
The radar
The Cheyenne radar (KCYS), 141 km from the middle of the area, began a volume at 22:02 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 12:00Z, 10.0 hours before the alert went out and 227 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.
- Mixed-layer CAPE
- 1538 J/kg
- Mixed-layer CIN
- -274 J/kg
- Mixed-layer LCL
- 1339 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- -1 m²/s²
- 0-3 km storm-relative helicity
- 19 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WGUS55 KCYS 182205 FFWCYS WYC015-190100- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE CHEYENNE WY 402 PM MDT FRI JUL 18 2003 THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A * FLASH FLOOD WARNING FOR... NORTHWESTERN GOSHEN COUNTY IN SOUTHEAST WYOMING * UNTIL 700 PM MDT * AT 352 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THUNDERSTORMS WITH VERY HEAVY RAINFALL WERE 11 MILES SOUTHWEST OF JAY EM...OR ABOUT 25 MILES NORTHWEST OF TORRINGTON...MOVING NORTHEAST AT 5 MPH OR LESS. DOPPLAR RADAR INDICATED AT LEAST FOUR INCHES OF THUNDERSTORM RAINFALL MAY HAVE BEEN DROPPED BY THE STORM OVER THE PAST HOUR. THE STORM IS NORTH OF HIGHWAY 26 AND EAST OF WYOMING HIGHWAY 270 IN NORTHWEST GOSHEN COUNTY. 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. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM. TO REPORT SEVERE WEATHER HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY YOUR REPORT TO THE NEAREST NATIONAL WEATHER SERVICE. LAT...LON 4252 10466 4222 10464 4220 10424 4255 10426 $$ COX
3 follow-up statements
175 RWUS32 KCYS 182249 FFSCYS WYC015-182345- FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 450 PM MDT FRI JUL 18 2003 ...A FLASH FLOOD WARNING CONTINUES UNTIL 700 PM MDT FOR NORTHWEST GOSHEN COUNTY... AT 445 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM ABOUT 20 MILES NORTHWEST OF TORRINGTON MOVING SOUTHEAST AT 5 MPH. BETWEEN 300 AND 400 PM THE STORM DROPPED IN EXCESS OF FOUR INCHES OF RAIN ABOUT 27 MILES NORTHWEST OF TORRINGTON. THIS AREA IS NORTH OF HIGHWAY 26 AND JUST EAST OF THE PLATTE-GOSHEN COUNTY LINE. AT 430 PM MDT THE PUBLIC REPORTED LOW LAND FLOODING ABOUT 15 MILES NORTHWEST OF FT. LARAMIE. QUARTER SIZE HAIL ALSO OCCURRED WITH THE STORM. MOST DEATHS IN FLASH FLOODING OCCUR IN AUTOMOBILES. DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE WATER COVERS THE ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY. MOVE TO HIGHER GROUND. A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING. IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY. RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY AUTOMOBILE. IF YOUR VEHICLE STALLS...ABANDON IT IMMEDIATELY AND SEEK HIGHER GROUND. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM. TO REPORT SEVERE WEATHER...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE. $$ COX
626 RWUS32 KCYS 182324 FFSCYS WYC015-190020- FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 520 PM MDT FRI JUL 18 2003 ...A FLASH FLOOD WARNING CONTINUES UNTIL 700 PM MDT FOR NORTHWEST GOSHEN COUNTY... AT 515 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM ABOUT 8 MILES NORTHWEST OF TORRINGTON MOVING SOUTHEAST AT 5 MPH. BRIEF HEAVY RAIN...SMALL HAIL AND GUSTY WINDS SHOULD BE EXPECTED WITH THIS STORM. IN THE HOUR AND A HALF BEFORE 420 PM A RELIABLE MEASUREMENT OF FIVE AND A HALF INCHES OF RAIN OCCURRED 11 MILES NORTHWEST OF FT. LARAMIE. UP TO THREE QUARTER INCH HAIL ALSO OCCURRED EARLIER. A COUPLE CULVERTS WERE WASHED OUT AS WELL AS SOME FENCE. IN THE HOUR BEFORE 400 PM CHEYENNE DOPPLER RADAR INDICATED FIVE TO SIX INCHES OF RAINFALL ABOUT 27 MILES NORTHWEST OF TORRINGTON. THIS AREA IS NORTH OF HIGHWAY 26 AND JUST EAST OF THE PLATTE-GOSHEN COUNTY LINE. AT 430 PM MDT THE PUBLIC REPORTED LOW LAND FLOODING ABOUT 15 MILES NORTHWEST OF FT. LARAMIE. QUARTER SIZE HAIL ALSO OCCURRED WITH THE STORM. MOST DEATHS IN FLASH FLOODING OCCUR IN AUTOMOBILES. DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE 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. 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. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM. TO REPORT SEVERE WEATHER...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE. $$ COX
834 RWUS32 KCYS 190100 FFSCYS WYC015-190200- FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 701 PM MDT FRI JUL 18 2003 ...THE FLASH FLOOD WARNING FOR NORTHWEST GOSHEN COUNTY WAS ALLOWED TO EXPIRE... THE FLASH FLOOD WARNING FOR NORTHWEST GOSHEN COUNTY WAS ALLOWED TO EXPIRE AT 700 PM. THUNDERSTORMS HAVE MOVED WELL TO THE EAST AND SOUTH OF THE AREA. NO HEAVY RAINFALL IS EXPECTED IN THE FLOODED AREA IN THE NEXT FEW HOURS. COTTONWOOD CREEK IN NORTHWEST GOSHEN COUNTY WAS REPORTED RUNNING FULL BUT WITHIN ITS BANKS. IN THE HOUR AND A HALF BEFORE 420 PM FIVE AND A HALF INCHES OF THUNDERSTORM RAINFALL OCCURRED 11 MILES NORTHWEST OF FT. LARAMIE. A COUPLE CULVERTS WERE WASHED OUT AS WELL AS SOME FENCE. AT 430 PM MDT THE PUBLIC REPORTED LOW LAND FLOODING ABOUT 15 MILES NORTHWEST OF FT. LARAMIE. QUARTER SIZE HAIL ALSO OCCURRED WITH THE STORM. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM. $$ COX
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 18, 3:17 PM MDT | Severe Thunderstorm Warning | CYS | Goshen | 43 min |
| Jul 18, 3:40 PM MDT | Severe Thunderstorm Warning | CYS | Albany | 35 min |
Nearby
Flash Flood Warnings in Wyoming, 2003Every flash flood warning in 2003
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.