Alert archive / Nebraska / Flash Flood Warnings in 2020

Flash Flood Warning 13, NWS Hastings, NE

August 16, 2020Clay County, Nebraska

NWS Hastings, NE issued this flash flood warning at Aug 16, 2020, 8:52 PM CDT for Clay 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: Aug 16, 2020, 8:52 PM CDT (01:52 UTC)
Expired: Aug 17, 2020, 2:45 AM CDT
In force: 6 hr
Issued by: NWS Hastings, NE
Area: Storm-based polygon
Flood severity: None

County Clay County, NE

The radar

The Grand Island radar (KUEX), 46 km from the middle of the area, began a volume at 01:51 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

Omaha, NE (KOAX), launched 00:00Z, 1.9 hours before the alert went out and 160 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: 1501 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 26 m²/s²
0-3 km storm-relative helicity: 47 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

298 
WGUS53 KGID 170152
FFWGID
NEC035-170745-
/O.NEW.KGID.FF.W.0013.200817T0152Z-200817T0745Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Hastings NE
852 PM CDT Sun Aug 16 2020

The National Weather Service in Hastings has issued a

* Flash Flood Warning for...
  Eastern Clay County in south central Nebraska...

* Until 245 AM CDT.

* At 852 PM CDT, Doppler radar indicated thunderstorms producing 
  heavy rain across the warned area. Between 2 and 4 inches of rain 
  have fallen. Flash flooding is ongoing or expected to begin 
  shortly.

  HAZARD...Flash flooding caused by thunderstorms.

  SOURCE...Doppler radar.

  IMPACT...Flooding of small creeks and streams, urban areas,
           highways, streets and underpasses as well as other
           drainage and low lying areas.

* Some locations that will experience flash flooding include...
  Primarily rural areas between Sutton, Clay Center, and Ong.

This includes the following streams and drainages...
  Little Sandy Creek, Elk Run Creek, Dry Sandy Creek, Turkey Creek, 
  School Creek, and Big Sandy Creek.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Turn around, don't drown when encountering flooded roads. Most flood 
deaths occur in vehicles.

&&

LAT...LON 4065 9808 4065 9782 4035 9782 4035 9795
      4058 9809

FLASH FLOOD...RADAR INDICATED

$$

Wesely

1 follow-up statement

337 
WGUS73 KGID 170736
FFSGID

Flash Flood Statement
National Weather Service Hastings NE
236 AM CDT Mon Aug 17 2020

NEC035-170746-
/O.EXP.KGID.FF.W.0013.000000T0000Z-200817T0745Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Clay NE-
236 AM CDT Mon Aug 17 2020

...FLASH FLOOD WARNING WILL EXPIRE AT 245 AM CDT EARLY THIS MORNING 
FOR EASTERN CLAY COUNTY...

The heavy rain has ended. Flooding is no longer expected to pose a 
threat. Please continue to heed remaining road closures.

LAT...LON 4065 9808 4065 9782 4035 9782 4035 9795
      4058 9809

$$

Rossi

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 16, 7:00 PM CDT	Severe Thunderstorm Warning	GID	Webster	30 min
Aug 16, 7:03 PM CDT	Severe Thunderstorm Warning	GID	Hall, Howard	27 min
Aug 16, 7:40 PM CDT	Special Weather Statement	GID	Clay, Nuckolls, Thayer	50 min
Aug 16, 7:44 PM CDT	Severe Thunderstorm Warning	GID	Thayer	31 min
Aug 16, 7:46 PM CDT	Severe Thunderstorm Warning	GID	Clay, Fillmore, Hamilton, Nuckolls, Thayer	44 min
Aug 16, 7:47 PM CDT	Special Weather Statement	GID	Phelps	28 min
Aug 16, 7:48 PM CDT	Special Weather Statement	GID	Kearney	27 min
Aug 16, 7:50 PM CDT	Special Weather Statement	GID	Hall	25 min
Aug 16, 8:10 PM CDT	Special Weather Statement	GID	Kearney	35 min
Aug 16, 8:26 PM CDT	Severe Thunderstorm Warning	GID	Clay, Fillmore, Nuckolls, Thayer	34 min
Aug 16, 8:50 PM CDT	Special Weather Statement	GID	Clay	40 min
Aug 16, 8:55 PM CDT	Special Weather Statement	GID	Nuckolls	35 min
Aug 16, 9:15 PM CDT	Special Weather Statement	GID	Nuckolls	45 min

Nearby

Flash Flood Warnings in Nebraska, 2020 Every flash flood warning in 2020

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.