Alert archive / Wyoming / Flash Flood Warnings in 1993
Flash Flood Warning 3, NWS Cheyenne, WY
NWS Cheyenne, WY issued this flash flood warning at Aug 20, 1993, 1:21 AM MDT for Goshen County, Wyoming. It was in force for 2 hr.
The area
The counties it named.
The facts
- Issued
- Aug 20, 1993, 1:21 AM MDT (07:21 UTC)
- Expired
- Aug 20, 1993, 3:30 AM MDT
- In force
- 2 hr
- Issued by
- NWS Cheyenne, WY
- Area
- Whole counties
County Goshen County, WY
The nearest sounding before it
Rapid City, SD (KRAP), launched 00:00Z, 7.4 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 200731 FFWCYS WYC015-200930- BULLETIN - EBS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE CHEYENNE WY 121 AM MDT FRI AUG 20 1993 THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A FLASH FLOOD WARNING EFFECTIVE UNTIL 330 AM MDT FOR PEOPLE IN THE FOLLOWING LOCATION... IN SOUTHEAST WYOMING ...CENTRAL GOSHEN COUNTY ...THIS WARNING INCLUDES THE TOWN OF TORRINGTON... ...VERY HEAVY RAIN HAS FALLEN ALONG CHERRY CREEK IN CENTRAL GOSHEN COUNTY... AT 130 AM MDT...EMERGENCY MANAGEMENT OFFICIALS IN GOSHEN COUNTY REPORTED NEATLY 2 INCHES OF RAIN HAD FALLEN SINCE 1 AM. CHERRY CREEK WAS REPORTED RISING QUICKLY. AT A POINT 9 MILES WEST AND 5 MILES NORTH OF VETERAN, A SHERIFFS DEPUTY REPORTED WATER 75 YARDS WIDE AND A FOOT AND A HALF DEEP. RADAR SHOWED THAT THE STORM WAS REMAINING STRONG AS IT MOVED NORTHEAST A15 MILES AN HOUR. MORE RAIN WILL LIKELY CAUSE FLOODING ALONG CHERRY CREEAND OTHER STREAMS IN GOSHEN COUNTY. THIS AREA OF CONCERN IS ABOUT 20 MIL WEST OF TORRINGTON. 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. 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 BED ABANDONED QUICKLY. MOVE TO HIGHER GROUND. 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 19, 8:35 PM MDT, 4 hours 46 minutes before
WYZ068>073-200400- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 835 PM MDT THU AUG 19 1993 ...INTENSE THUNDERSTORMS CONTINUE OVER SOUTHEAST WYOMING... AT 815 PM...INTENSE THUNDERSTORMS CONTINUED OVER SOUTHEAST WYOMING. AT THAT TIME...THE STRONGEST STORMS WERE LOCATED 15 MILES SOUTH OF SLATER...OR 29 MILES SOUTHEAST OF WHEATLAND AND 25 MILES SOUTHEAST OF WHEATLAND. IN ADDITION AN INTENSE THUNDERSTORM WAS OVER CHEYENNE. THE INTENSE THUNDERSTORMS WERE MOVING SLOWLY EAST. THESE INTENSE THUNDERSTORMS WERE PRODUCING HEAVY RAIN...SMALL HAIL AND DANGEROUS LIGHTNING. THE THUNDERSTORMS WILL CONTINUE IN SOUTHEAST WYOMING UNTIL MIDNIGHT. DUE TO THE SLOW MOVEMENT OF THE STORMS... FLOODING OF SMALL STREAMS...LOW LYING AREAS AND URBAN AREAS IS POSSIBLE. A FLASH FLOOD WATCH IS IN EFFECT UNTIL MIDNIGHT FOR FAR EAST WYOMING. < PEOPLE IN SOUTHEAST WYOMING SHOULD BE PREPARED FOR THE INTENSE THUNDERSTORMS. HEAVY RAIN AND FLOODING IS QUITE POSSIBLE...SO MOVE OUT OF LOW LYING AREAS AND DO NOT TRY TO CROOS WATER RUNNING OVER ROADS OR BRIDGES. WCJIN-WYSE WEILAND
Special weather statement, Aug 19, 8:41 PM MDT, 4 hours 40 minutes before
WYZ068>073-200400- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 835 PM MDT THU AUG 19 1993 ...INTENSE THUNDERSTORMS CONTINUE OVER SOUTHEAST WYOMING... AT 815 PM...INTENSE THUNDERSTORMS CONTINUED OVER SOUTHEAST WYOMING. AT THAT TIME...THE STRONGEST STORMS WERE LOCATED 15 MILES SOUTH OF SLATER...OR 29 MILES SOUTHEAST OF WHEATLAND AND 25 MILES SOUTHEAST OF WHEATLAND. IN ADDITION AN INTENSE THUNDERSTORM WAS OVER CHEYENNE. THE INTENSE THUNDERSTORMS WERE MOVING SLOWLY EAST. THESE INTENSE THUNDERSTORMS WERE PRODUCING HEAVY RAIN...SMALL HAIL AND DANGEROUS LIGHTNING. THE THUNDERSTORMS WILL CONTINUE IN SOUTHEAST WYOMING UNTIL MIDNIGHT. DUE TO THE SLOW MOVEMENT OF THE STORMS... FLOODING OF SMALL STREAMS...LOW LYING AREAS AND URBAN AREAS IS POSSIBLE. A FLASH FLOOD WATCH IS IN EFFECT UNTIL MIDNIGHT FOR FAR EAST WYOMING. < PEOPLE IN SOUTHEAST WYOMING SHOULD BE PREPARED FOR THE INTENSE THUNDERSTORMS. HEAVY RAIN AND FLOODING IS QUITE POSSIBLE...SO MOVE OUT OF LOW LYING AREAS AND DO NOT TRY TO CROOS WATER RUNNING OVER ROADS OR BRIDGES. WCJIN-WYSE WEILAND
Special weather statement, Aug 20, 12:27 AM MDT, 54 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, 50 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, 2:22 AM MDT | Severe Thunderstorm Warning | CYS | Goshen | 34 min |
| Aug 20, 3:34 AM MDT | Flash Flood Warning | CYS | Goshen | 86 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.