Alert archive / Nebraska / Flash Flood Warnings in 2011
Flash Flood Warning 9, NWS Cheyenne, WY
NWS Cheyenne, WY issued this flash flood warning at Jul 2, 2011, 8:25 PM MDT for Goshen County, Wyoming; Banner County, Scotts Bluff County, Nebraska. It was in force for 6 hr. 5 reports 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
- Jul 2, 2011, 8:25 PM MDT (02:25 UTC)
- Expired
- Jul 3, 2011, 1:56 AM MDT
- In force
- 6 hr
- Issued by
- NWS Cheyenne, WY
- Area
- Storm-based polygon
- Flood severity
- None
Counties Banner County, NE, Scotts Bluff County, NE, Goshen County, WY
The radar
The Cheyenne radar (KCYS), 115 km from the middle of the area, began a volume at 02:27 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 |
|---|---|---|---|
| Jul 2, 8:25 PM MDT | FLASH FLOOD | 4 W Lyman, WY | WATER OVER HIGHWAY 92 EAST OF HUNTLEY |
| Jul 2, 8:40 PM MDT | FLASH FLOOD | 9 Se Torrington, WY | INTERSECTION OF HIGHWAY 61 AND 92 FLOODED AND CLOSED |
| Jul 2, 8:58 PM MDT | FLASH FLOOD | 3 Ssw Lyman, WY | HIGHWAY 158...MILE MARKER 1 FLOODED WITH DEBRIS OVER ROAD |
| Jul 2, 10:58 PM MDT | FLASH FLOOD | Lyman, NE | HIGHWAY 92 BETWEEN LYMAN AND GERING FLOODED IN MANY AREAS |
| Jul 2, 11:00 PM MDT | FLASH FLOOD | 9 Nw Harrisburg, NE | SEVERAL COUNTY ROADS ACROSS NORTHWESTERN BANNER COUNTY FLOODED AND CLOSED |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Denver, CO (KDNR), launched 00:00Z, 2.4 hours before the alert went out and 224 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
- 920 J/kg
- Mixed-layer CIN
- -98 J/kg
- Mixed-layer LCL
- 2294 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- -51 m²/s²
- 0-3 km storm-relative helicity
- -12 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -1.0
The text
As transmitted, in the capitals the NWS used until 2016.
315 WGUS55 KCYS 030225 FFWCYS NEC007-157-WYC015-030830- /O.NEW.KCYS.FF.W.0009.110703T0225Z-110703T0830Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE CHEYENNE WY 825 PM MDT SAT JUL 2 2011 THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A * FLASH FLOOD WARNING FOR... NORTHERN BANNER COUNTY IN THE PANHANDLE OF NEBRASKA... SCOTTS BLUFF COUNTY IN THE PANHANDLE OF NEBRASKA... SOUTHEASTERN GOSHEN COUNTY IN SOUTHEAST WYOMING... * UNTIL 230 AM MDT SUNDAY * AT 824 PM MDT...EMERGENCY MANAGEMENT REPORTED SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE WARNED AREA. WATER WAS REPORTED OVER HIGHWAY 92 SOUTH OF HUNTLEY BY THE SCOTTSBLUFF EMERGENCY MANAGER. * RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE... SCOTTSBLUFF...GERING...LAKE ALICE...LYMAN...MITCHELL...MORRILL... SCOTTS BLUFF NATIONAL MONUMENT...SCOTTSBLUFF AIRPORT...STEGALL... TERRYTOWN AND WILDCAT HILLS STATE RECREATION AREA. PRECAUTIONARY/PREPAREDNESS ACTIONS... TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN CHEYENNE. && LAT...LON 4201 10354 4162 10350 4158 10410 4199 10424 $$ CLAYCOMB
1 follow-up statement
576 WGUS75 KCYS 030756 FFSCYS FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 156 AM MDT SUN JUL 3 2011 NEC007-157-WYC015-030811- /O.CAN.KCYS.FF.W.0009.000000T0000Z-110703T0830Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BANNER NE-SCOTTS BLUFF NE-GOSHEN WY- 156 AM MDT SUN JUL 3 2011 ...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR SOUTHEASTERN GOSHEN...SCOTTS BLUFF AND NORTHERN BANNER COUNTIES IS CANCELLED AND HAS BEEN REPLACED WITH AN AREAL FLOOD WARNING THROUGH 10 AM TODAY... EXCESS RUNOFF FROM HEAVY RAIN HAS ENDED OVER THE WARNED AREA. STREAMS AND CREEKS IN THE WARNED AREA HAVE RECEDED OR WERE BEGINNING TO RECEDE...ENDING THE FLOOD THREAT. IF FLOODING HAS BEEN OBSERVED... PLEASE REPORT IT TO YOUR LOCAL LAW ENFORCEMENT AGENCY. PRECAUTIONARY/PREPAREDNESS ACTIONS... IF FLOODING WAS OBSERVED PLEASE RELAY YOUR REPORT TO LOCAL LAW ENFORCEMENT OR TO THE NATIONAL WEATHER SERVICE IN CHEYENNE. && LAT...LON 4201 10354 4162 10350 4158 10410 4199 10424 $$ CLAYCOMB
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 2, 6:04 PM MDT | Severe Thunderstorm Warning | CYS | Goshen, Platte | 41 min |
| Jul 2, 6:22 PM MDT | Tornado Warning | CYS | Goshen | 37 min |
| Jul 2, 6:44 PM MDT | Severe Thunderstorm Warning | CYS | Goshen | 61 min |
| Jul 2, 6:56 PM MDT | Tornado Warning | CYS | Goshen | 49 min |
| Jul 2, 7:23 PM MDT | Tornado Warning | CYS | Goshen | 37 min |
| Jul 2, 7:54 PM MDT | Tornado Warning | CYS | Goshen | 40 min |
| Jul 2, 8:30 PM MDT | Tornado Warning | CYS | Goshen | 45 min |
| Jul 3, 1:55 AM MDT | Areal Flood Warning | CYS | Goshen | 7 hr |
| Jul 2, 7:41 PM MDT | Severe Thunderstorm Warning | CYS | Box Butte, Morrill, Scotts Bluff, Sioux | 49 min |
| Jul 2, 9:11 PM MDT | Severe Thunderstorm Warning | CYS | Banner, Cheyenne, Kimball, Morrill, Scotts Bluff | 49 min |
Nearby
Flash Flood Warnings in Nebraska, 2011Flash Flood Warnings in Wyoming, 2011Every flash flood warning in 2011
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.