Alert archive / Nebraska / Flash Flood Warnings in 2012
Flash Flood Warning 3, NWS Cheyenne, WY
NWS Cheyenne, WY issued this flash flood warning at Apr 26, 2012, 9:59 PM MDT for Box Butte County, Nebraska. It was in force for 4 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
- Apr 26, 2012, 9:59 PM MDT (03:59 UTC)
- Expired
- Apr 27, 2012, 2:00 AM MDT
- In force
- 4 hr
- Issued by
- NWS Cheyenne, WY
- Area
- Storm-based polygon
- Flood severity
- None
County Box Butte County, NE
The radar
The North Platte radar (KLNX), 195 km from the middle of the area, began a volume at 04:02 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 |
|---|---|---|---|
| Apr 26, 11:00 PM MDT | FLASH FLOOD | 7 N Alliance, NE | HIGHWAY 87 NORTH OF ALLIANCE BETWEEN MM 6 AND MM 16 FLLODED AND CLOSED. |
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 (KUNR), launched 00:00Z, 4.0 hours before the alert went out and 206 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
- 35 J/kg
- Mixed-layer CIN
- -110 J/kg
- Mixed-layer LCL
- 1002 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 184 m²/s²
- 0-3 km storm-relative helicity
- 516 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.7
The text
As transmitted, in the capitals the NWS used until 2016.
482 WGUS55 KCYS 270359 FFWCYS NEC013-270800- /O.NEW.KCYS.FF.W.0003.120427T0359Z-120427T0800Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE CHEYENNE WY 959 PM MDT THU APR 26 2012 THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A * FLASH FLOOD WARNING FOR... CENTRAL BOX BUTTE COUNTY IN THE PANHANDLE OF NEBRASKA... * UNTIL 200 AM MDT * AT 940 PM MDT...LAW ENFORCEMENT REPORTED CONTINUED FLOODING ALONG HIGHWAY 87 NORTH OF ALLIANCE...WITH THE HIGHWAY CLOSED BETWEEN MILE MARKER 6 AND MILE MARKER 16. 4 TO 6 INCHES OF WATER REMAINS OVER THE ROAD. AN ADDITIONAL ONE QUARTER OF AN INCH OF RAIN IS POSSIBLE THROUGH 200 AM MDT. * SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...BEREA AND WILD HORSE BUTTE. PRECAUTIONARY/PREPAREDNESS ACTIONS... EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE BANKS OF CREEKS AND STREAMS. TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN CHEYENNE. && LAT...LON 4230 10282 4215 10278 4211 10303 4225 10309 $$ HAMMER/MAZUR
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 26, 6:05 PM MDT | Special Weather Statement | CYS | Box Butte | 55 min |
| Apr 26, 7:04 PM MDT | Special Weather Statement | CYS | Box Butte | 56 min |
| Apr 26, 7:59 PM MDT | Special Weather Statement | CYS | Box Butte | 31 min |
| Apr 26, 10:58 PM MDT | Areal Flood Advisory | CYS | Scotts Bluff | 6 hr |
| Apr 27, 2:00 AM MDT | Areal Flood Advisory | CYS | Box Butte | 7 hr |
| Apr 27, 5:02 AM MDT | Areal Flood Advisory | CYS | Scotts Bluff | 103 min |
Nearby
Flash Flood Warnings in Nebraska, 2012Every flash flood warning in 2012
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.