Alert archive / Wyoming / Flash Flood Warnings in 1996
Flash Flood Warning 1, NWS Cheyenne, WY
NWS Cheyenne, WY issued this flash flood warning at May 30, 1996, 2:33 PM MDT for Platte County, Wyoming. It was in force for 42 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- May 30, 1996, 2:33 PM MDT (20:33 UTC)
- Expired
- May 30, 1996, 3:15 PM MDT
- In force
- 42 min
- Issued by
- NWS Cheyenne, WY
- Area
- Whole counties
County Platte County, WY
The radar
The Cheyenne radar (KCYS), 110 km from the middle of the area, began a volume at 20:35 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, 8.6 hours before the alert went out and 274 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
- 12 J/kg
- Mixed-layer CIN
- -136 J/kg
- Mixed-layer LCL
- 674 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 90 m²/s²
- 0-3 km storm-relative helicity
- 194 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KCYS 302038 FFWCYS WYC031-302115- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM AND FLASH FLOOD WARNING NATIONAL WEATHER SERVICE CHEYENNE WY 233 PM MDT THU MAY 30 1996 THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A SEVERE THUNDERSTORM AND FLASH FLOOD WARNING EFFECTIVE UNTIL 315 PM MDT FOR PEOPLE IN THE FOLLOWING LOCATION... IN SOUTHEAST WYOMING ...SOUTHERN PLATTE COUNTY ...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN PLATTE COUNTY HAS BEEN EXTENDED UNTIL 315 PM MDT... AT 230 PM MDT A SEVERE THUNDERSTORM WAS 10 MILES NORTHWEST OF CHUGWATER MOVING EAST AT 15 MPH. THIS THUNDERSTORM HAS ALREADY PRODUCED LARGE HAIL AND VERY HEAVY RAIN. FLASH FLOODING IS POSSIBLE ALONG SYBILLE AND RICHEAU CREEKS AS WELL AS OTHER SMALLER CREEKS IN THE AREA. RAINFALL OF THREE INCHES WILL PRODUCE FLASH FLOODING IN THIS AREA. GO INSIDE A STURDY BUILDING AND STAY AWAY FROM WINDOWS! A TORNADO WATCH IS IN EFFECT. SEVERE THUNDERST$ORMS CAN PRODUCE TORNADOES. DO NOT DRIVE THROUGH FLOOD WATERS OVER ROADS. WCJIN-WYSE. BAKER
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, May 30, 9:29 AM MDT, 5 hours 4 minutes before
WYZ059>070-NEZ001>003-019>021-054-055-302300 SEVERE WEATER OUTLOOK NATIONAL WEATHER SERVICE CHEYENNE WY 1000 AM MDT THU MAY 30 1996 THE SEVERE WEATHER POTENTIAL IN THE NWS CHEYENNE COUNTY WARNING AREA IS MEDIUM FOR TODAY. SPOTTER ACTIVITY MAY BE NECESSARY BY THIS AFTERNOON. DISCUSSION...SOUTH TO SOUTHEAST LOW LEVEL FLOW WITH SURFACE DEWPOINTS IN 50S UPSTREAM. LIFTED INDICES OVER AREA ALREADY 0 TO -2 AND FORECAST EVEN LOWER BY LATE AFTERNOON AS TEMPERATURES WARM INTO THE 70S. STRONG UPWARD MOTION ALSO FORECAST TO DEVELOP. LEE SIDE SURFACE LOW PRESSURE TROF EASTERN WYOMING TO AID LOW LEVEL CONVERGENCE. 700 MILLIBAR THERMAL RIDGE JUST TO EAST OF EASTERN WYOMING BORDER ALSO A CONTRIBUTING FACTOR. THIS OUTLOOK IS FOR THE FOLLOWING COUNTIES IN SOUTHEAST WYOMING AND THE NEBRASKA PANHANDLE... WYOMING... ALBANY CARBON CONVERSE GOSHEN LARAMIE NIOBRARA PLATTE NEBRASKA... BANNER BOX BUTTE CHEYENNE DAWES KIMBAL MORRILLt SIOUX SCOTTS BLUFF WCJIN-WYSE CGB
Special weather statement, May 30, 12:56 PM MDT, 1 hour 37 minutes before
WYZ065>066-067-302000- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 1255 PM MDT THU MAY 30 1996 AT 1250 PM...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM 25 MILES NORTHWEST OF LARAMIE IN ALBANY COUNTY WYOMING. THE STORM WAS MOVING TO THE NORTHEAST AT 25 TO 30 MILES AN HOUR. SMALL HAIL...BRIEF HEAVY RAIN AND STRONG GUSTY WINDS CAN BE EXPECTED FROM THIS STORM UNTIL 2 PM THIS AFTERNOON. WCJIN-WYSE PAL
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 30, 1:32 PM MDT | Severe Thunderstorm Warning | CYS | Platte | 58 min |
| May 30, 2:33 PM MDT | Severe Thunderstorm Warning | CYS | Platte | 42 min |
| May 30, 3:17 PM MDT | Tornado Warning | CYS | Goshen, Platte | 28 min |
| May 30, 3:49 PM MDT | Severe Thunderstorm Warning | CYS | Goshen, Platte | 26 min |
| May 30, 4:15 PM MDT | Severe Thunderstorm Warning | CYS | Goshen | 45 min |
| May 30, 5:03 PM MDT | Severe Thunderstorm Warning | CYS | Goshen | 27 min |
Nearby
Flash Flood Warnings in Wyoming, 1996Every flash flood warning in 1996
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.