Alert archive / Wyoming / Flash Flood Warnings in 2016
Flash Flood Warning 13, NWS Cheyenne, WY
NWS Cheyenne, WY issued this flash flood warning at Aug 7, 2016, 11:01 PM MDT for Goshen County, Platte County, Wyoming. It was in force for 3 hr. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Aug 7, 2016, 11:01 PM MDT (05:01 UTC)
- Expired
- Aug 8, 2016, 2:00 AM MDT
- In force
- 3 hr
- Issued by
- NWS Cheyenne, WY
- Area
- Storm-based polygon
- Flood severity
- None
Counties Goshen County, WY, Platte County, WY
The radar
The Cheyenne radar (KCYS), 125 km from the middle of the area, began a volume at 05:00 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 7, 11:15 PM MDT | FLASH FLOOD | 2 Se Fort Laramie, WY | GOSHEN COUNTY EMA REPORTS EVIDENCE OF FLASH FLOODING FROM HEAVY RAIN LAST EVENING. DEBRIS ON HIGHWAY 2 MILES SOUTHEAST OF FORT LARAMIE. AT 7 AM...WATER STILL HIGH IN CREEK WITH DEBRIS IN THE FENCE LINE. RAILROAD APPROACH WEST OF FORT LARAMIE WAS NEARLY WASHED |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Rapid City, SD (KRAP), launched 00:00Z, 5.0 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.
- Mixed-layer CAPE
- 966 J/kg
- Mixed-layer CIN
- -124 J/kg
- Mixed-layer LCL
- 1514 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 72 m²/s²
- 0-3 km storm-relative helicity
- 55 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.7
The text
As transmitted.
547 WGUS55 KCYS 080501 FFWCYS WYC015-031-080800- /O.NEW.KCYS.FF.W.0013.160808T0501Z-160808T0800Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE CHEYENNE WY 1101 PM MDT SUN AUG 7 2016 THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A * FLASH FLOOD WARNING FOR... NORTHWESTERN GOSHEN COUNTY IN SOUTHEASTERN WYOMING... EAST CENTRAL PLATTE COUNTY IN SOUTHEASTERN WYOMING... * UNTIL 200 AM MDT * AT 1100 PM MDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING HEAVY RAIN ACROSS THE WARNED AREA. UP TO TWO INCHES OF RAIN HAVE ALREADY FALLEN. FLASH FLOODING IS EXPECTED TO BEGIN SHORTLY. * SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... GUERNSEY...LINGLE...FORT LARAMIE...GRAYROCKS RESERVOIR... FORT LARAMIE NATIONAL HISTORIC SITE... HARTVILLE AND HWY 85 AT DRY RAWHIDE CREEK. ADDITIONAL RAINFALL AMOUNTS OF 1 TO 2 INCHES ARE POSSIBLE IN THE WARNED AREA. PRECAUTIONARY/PREPAREDNESS ACTIONS... TURN AROUND...DON'T DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD DEATHS OCCUR IN VEHICLES. BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE DANGERS OF FLOODING. && LAT...LON 4237 10426 4196 10427 4211 10475 4241 10473 $$ HAMMER
1 follow-up statement
675 WGUS75 KCYS 080801 FFSCYS FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 201 AM MDT MON AUG 8 2016 WYC015-031-080811- /O.EXP.KCYS.FF.W.0013.000000T0000Z-160808T0800Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ GOSHEN WY-PLATTE WY- 201 AM MDT MON AUG 8 2016 ...THE FLASH FLOOD WARNING FOR NORTHWESTERN GOSHEN AND EAST CENTRAL PLATTE COUNTIES HAS EXPIRED... THE HEAVY RAIN HAS ENDED. FLOODING IS NO LONGER EXPECTED TO POSE A THREAT. PLEASE CONTINUE TO HEED ANY REMAINING ROAD CLOSURES. LAT...LON 4237 10426 4196 10427 4211 10475 4241 10473 $$ HAMMER
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 7, 6:07 PM MDT | Special Weather Statement | CYS | Converse | 38 min |
| Aug 7, 6:53 PM MDT | Special Weather Statement | CYS | Converse | 37 min |
| Aug 7, 7:33 PM MDT | Special Weather Statement | CYS | Platte | 57 min |
| Aug 7, 8:28 PM MDT | Special Weather Statement | CYS | Platte | 62 min |
| Aug 7, 8:37 PM MDT | Special Weather Statement | CYS | Niobrara | 38 min |
| Aug 7, 9:26 PM MDT | Special Weather Statement | CYS | Goshen | 64 min |
| Aug 7, 10:26 PM MDT | Special Weather Statement | CYS | Goshen | 64 min |
| Aug 7, 10:28 PM MDT | Severe Thunderstorm Warning | CYS | Goshen, Platte | 62 min |
| Aug 8, 2:47 AM MDT | Fire Weather Watch | CYS | 17 hr | |
| Aug 8, 3:50 PM MDT | Special Weather Statement | CYS | Niobrara | 40 min |
Nearby
Flash Flood Warnings in Wyoming, 2016Every flash flood warning in 2016
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.