Alert archive / Nebraska / Flash Flood Warnings in 2015

Flash Flood Warning 8, NWS North Platte, NE

September 22, 2015Boyd County, Keya Paha County, Nebraska

NWS North Platte, NE issued this flash flood warning at Sep 22, 2015, 10:59 PM CDT for Boyd County, Keya Paha County, Nebraska. It was in force for 6 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Sep 22, 2015, 10:59 PM CDT (03:59 UTC)
Expired: Sep 23, 2015, 5:00 AM CDT
In force: 6 hr
Issued by: NWS North Platte, NE
Area: Storm-based polygon
Flood severity: None

Counties Boyd County, NE, Keya Paha County, NE

The radar

The Sioux Falls radar (KFSD), 174 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.

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 4.0 hours before the alert went out and 220 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2600 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 71 m²/s²
0-3 km storm-relative helicity: 503 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

934 
WGUS53 KLBF 230359
FFWLBF
NEC015-103-231000-
/O.NEW.KLBF.FF.W.0008.150923T0359Z-150923T1000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
1059 PM CDT TUE SEP 22 2015

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE  HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN KEYA PAHA COUNTY IN NORTH CENTRAL NEBRASKA...
  NORTHERN BOYD COUNTY IN NORTH CENTRAL NEBRASKA...

* UNTIL 500 AM CDT WEDNESDAY
    
* AT 1058 PM CDT...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...
  BROCKSBURG...GROSS...NAPER...ANOKA...BUTTE AND SPENCER. 

THIS INCLUDES HIGHWAY 281 BETWEEN MILE MARKERS 215 AND 223.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE TO HIGHER GROUND NOW. ACT QUICKLY TO PROTECT YOUR LIFE.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING.

PLEASE REPORT FLOODING TO YOUR LOCAL LAW ENFORCEMENT AGENCY WHEN YOU
CAN DO SO SAFELY.

&&

LAT...LON 4293 9844 4288 9832 4285 9831 4293 9940
      4300 9938 4300 9850

$$

JACOBS

1 follow-up statement

066 
WGUS73 KLBF 230955
FFSLBF

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
455 AM CDT WED SEP 23 2015

NEC015-103-231005-
/O.EXP.KLBF.FF.W.0008.000000T0000Z-150923T1000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
KEYA PAHA NE-BOYD NE-
455 AM CDT WED SEP 23 2015

...THE FLASH FLOOD WARNING FOR NORTHEASTERN KEYA PAHA AND NORTHERN
BOYD COUNTIES WILL EXPIRE AT 500 AM CDT...

THE HEAVY RAIN HAS ENDED...AND FLOODING IS NO LONGER EXPECTED TO POSE
A THREAT.

LAT...LON 4293 9844 4288 9832 4285 9831 4293 9940
      4300 9938 4300 9850

$$

POWER

The office that day

Everything else NWS North Platte, NE issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 22, 7:10 PM CDT	Severe Thunderstorm Warning	LBF	Lincoln	29 min
Sep 22, 7:56 PM CDT	Special Weather Statement	LBF	Lincoln	49 min
Sep 22, 7:58 PM CDT	Special Weather Statement	LBF	Custer	47 min
Sep 22, 8:14 PM CDT	Special Weather Statement	LBF	Logan	46 min
Sep 22, 8:37 PM CDT	Special Weather Statement	LBF	Blaine	38 min
Sep 22, 9:01 PM CDT	Special Weather Statement	LBF	Thomas	44 min
Sep 22, 9:10 PM CDT	Special Weather Statement	LBF	Blaine	50 min
Sep 22, 9:38 PM CDT	Special Weather Statement	LBF	Boyd	52 min
Sep 22, 9:39 PM CDT	Special Weather Statement	LBF	Cherry	51 min
Sep 22, 10:02 PM CDT	Special Weather Statement	LBF	Keya Paha	43 min
Sep 22, 10:30 PM CDT	Special Weather Statement	LBF	Boyd, Keya Paha	45 min
Sep 22, 10:53 PM CDT	Severe Thunderstorm Warning	LBF	Boyd	21 min
Sep 23, 4:18 AM CDT	Flash Flood Watch	LBF	Boyd, Holt	25 hr
Sep 23, 2:26 PM CDT	Areal Flood Advisory	LBF	Cherry, Hooker, McPherson, Thomas	6 hr

Nearby

Flash Flood Warnings in Nebraska, 2015 Every flash flood warning in 2015

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.