Alert archive / Wyoming / Flash Flood Warnings in 1993
Flash Flood Warning 4, NWS Cheyenne, WY
NWS Cheyenne, WY issued this flash flood warning at Aug 20, 1993, 3:34 AM MDT for Goshen County, Wyoming. It was in force for 86 min.
The area
The counties it named.
The facts
- Issued
- Aug 20, 1993, 3:34 AM MDT (09:34 UTC)
- Expired
- Aug 20, 1993, 5:00 AM MDT
- In force
- 86 min
- Issued by
- NWS Cheyenne, WY
- Area
- Whole counties
County Goshen County, WY
The nearest sounding before it
Rapid City, SD (KRAP), launched 00:00Z, 9.6 hours before the alert went out and 251 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
- 774 J/kg
- Mixed-layer CIN
- -36 J/kg
- Mixed-layer LCL
- 1714 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 8 m²/s²
- 0-3 km storm-relative helicity
- 39 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.6
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KCYS 200938 COR FFWCYS WYC015-201230- BULLETIN - EBS ACTIVATION REQUESTED FLASH FLOOD WARNING...CORRECTED NATIONAL WEATHER SERVICE CHEYENNE WY 334 AM MDT FRI AUG 20 1993 THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A FLASH FLOOD WARNING EFFECTIVE UNTIL 630 AM MDT FOR PEOPLE IN THE FOLLOWING LOCATION... IN SOUTHEAST WYOMING ...CENTRAL GOSHEN COUNTY ...THIS WARNING INCLUDES THE TOWNS OF TORRINGTON..LINGLE..AND VETERAN... AT 315 AM MDT...MORE THUNDERSTORMS WERE DEVELOPING IN CENTRAL GOSHEN COUNTY AT 315 AM MDT. THIS AREA RECEIVED HEAVY RAIN EARLIER WHICH RESULTED IN FLASH FLOODING. ANY NEW RAIN WILL PRODUCE MORE FLOODING. THUNDERSTORMS WILL CONTINUE IN CENTRAL GOSHEN COUNTY THROUGH 7 AM MDT. THIS HAS PROMPTED THE NATIONAL WEATHER SERVICE TO EXTEND THE FLASH FLOOD WARNING UNTIL 7 AM MDT. BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE DANGERS OF FLOODS AND FLASH FLOODS. IF FLASH FLOODING IS OBSERVED...ACT QUICKLY. MOVE UP TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING. A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IS IMMINENT. MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES. DO NOT ATTEMPT TO CROSS BRIDGES...DIPS...OR LOW SPOTS IF WATER COVERS THE ROADWAY. NEVER TRY TO CROSS A FLOWING STREAM...EVEN A SMALL ONE...ON FOOT. TO ESCAPE RISING WATER MOVE UP TO HIGHER GROUND. ...CORRECTED TO ADD SPECIAL CODING... WCJIN-WYSE CAS
What forecasters said that day
The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
In the hours before
Special weather statement, Aug 20, 12:27 AM MDT, 3 hours 7 minutes before
WYZ068-069-070-200830- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 1227 AM MDT FRI AUG 20 1993 ...STRONG THUNDERSTORMS WERE NEAR WHEATLAND IN SOUTHEAST WYOMING... AT 1215 AM MDT...RADAR INDICATED THAT STRONG THUNDERSTORMS HAD REDEVELOPED ABOUT 10 MILES SOUTHEAST OF WHEATLAND. ANOTHER STORM WAS 8 MILES NORTHEAST OF SLATER. THIS AREA IS RIGHT ALONG THE PLATTE AND GOSHEN COUNTY LINE. THE THUNDERSTORMS WERE MOVING NORTHEAST AT 15 MILES AN HOUR. NO REPORTS HAD BEEN RECEIVED FROM OBSERVERS IN THE AREAS. SMALL HAIL IS ALSO LIKELY. STORMS IN THIS AREA EARLIER IN THE EVENING PRODUCED HEAVY RAIN. MORE RAIN OVER THE WET GROUND COULD CAUSE RAPID RUNOFF AND LOCALIZED FLASH FLOODING IN SOME AREAS. PEOPLE TRAVELING IN PLATTE AND GOSHEN COUNTIES SHOULD PAY CLOSE ATTENTION AND WATCH FOR FLOODING IN LOW LYING AREAS. DO NOT ATTEMPT TO DRIVE OR WADE THROUGH FLOODED AREAS. THE CURRENT COULD BE STRONGER THAN EXPECTED AND OTHER HAZARDS COULD BE HIDDEN BENEATH THE WATER. WCJIN-WYSE CAS
Special weather statement, Aug 20, 12:31 AM MDT, 3 hours 3 minutes before
WYZ068-069-070-200830- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 1227 AM MDT FRI AUG 20 1993 ...STRONG THUNDERSTORMS WERE NEAR WHEATLAND IN SOUTHEAST WYOMING... AT 1215 AM MDT...RADAR INDICATED THAT STRONG THUNDERSTORMS HAD REDEVELOPED ABOUT 10 MILES SOUTHEAST OF WHEATLAND. ANOTHER STORM WAS 8 MILES NORTHEAST OF SLATER. THIS AREA IS RIGHT ALONG THE PLATTE AND GOSHEN COUNTY LINE. THE THUNDERSTORMS WERE MOVING NORTHEAST AT 15 MILES AN HOUR. NO REPORTS HAD BEEN RECEIVED FROM OBSERVERS IN THE AREAS. SMALL HAIL IS ALSO LIKELY. STORMS IN THIS AREA EARLIER IN THE EVENING PRODUCED HEAVY RAIN. MORE RAIN OVER THE WET GROUND COULD CAUSE RAPID RUNOFF AND LOCALIZED FLASH FLOODING IN SOME AREAS. PEOPLE TRAVELING IN PLATTE AND GOSHEN COUNTIES SHOULD PAY CLOSE ATTENTION AND WATCH FOR FLOODING IN LOW LYING AREAS. DO NOT ATTEMPT TO DRIVE OR WADE THROUGH FLOODED AREAS. THE CURRENT COULD BE STRONGER THAN EXPECTED AND OTHER HAZARDS COULD BE HIDDEN BENEATH THE WATER. WCJIN-WYSE CAS
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 19, 6:19 PM MDT | Severe Thunderstorm Warning | CYS | Goshen | 56 min |
| Aug 20, 1:21 AM MDT | Flash Flood Warning | CYS | Goshen | 2 hr |
| Aug 20, 2:22 AM MDT | Severe Thunderstorm Warning | CYS | Goshen | 34 min |
Nearby
Flash Flood Warnings in Wyoming, 1993Every flash flood warning in 1993
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.