Alert archive / Nebraska / Flash Flood Watches in 2015

Flash Flood Watch 4, NWS Hastings, NE

August 16, 20154 counties in Nebraska

NWS Hastings, NE issued this flash flood watch at Aug 16, 2015, 4:27 AM CDT for 4 counties in Nebraska. It was in force for 5 hr.

The area

The counties it named.

The facts

Issued: Aug 16, 2015, 4:27 AM CDT (09:27 UTC)
Expired: Aug 16, 2015, 9:19 AM CDT
In force: 5 hr
Issued by: NWS Hastings, NE
Flood severity: None

Counties Dawson County, NE, Greeley County, NE, Sherman County, NE, Valley County, NE

The radar

The Grand Island radar (KUEX), 122 km from the middle of the area, began a volume at 09:30 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

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 9.5 hours before the alert went out and 129 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: 2275 J/kg
Mixed-layer CIN: -75 J/kg
Mixed-layer LCL: 1872 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 65 m²/s²
0-3 km storm-relative helicity: 305 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 8.8

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Hastings, NE wrote its last area forecast discussion before this flash flood watch went out at Aug 16, 12:58 AM CDT, 3 hours 29 minutes earlier.

Area forecast discussion, Aug 16, 12:58 AM CDT, 3 hours 29 minutes before

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Hazardous weather outlook, Aug 15, 9:38 PM CDT, 6 hours 49 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 16, 6:25 AM CDT	Special Weather Statement	GID	Buffalo	35 min
Aug 16, 6:36 AM CDT	Areal Flood Advisory	GID	Buffalo	4 hr
Aug 16, 7:06 AM CDT	Special Weather Statement	GID	Phelps	24 min
Aug 16, 9:19 AM CDT	Flash Flood Watch	GID	Buffalo, Dawson, Furnas, Gosper, Greeley, Kearney and 3 more	13 hr
Aug 16, 9:44 AM CDT	Areal Flood Advisory	GID	Gosper	4 hr
Aug 16, 3:25 PM CDT	Severe Thunderstorm Warning	GID	Furnas, Gosper, Harlan, Phelps	35 min
Aug 16, 4:00 PM CDT	Severe Thunderstorm Warning	GID	Furnas, Gosper, Harlan	34 min
Aug 16, 4:05 PM CDT	Flash Flood Warning	GID	Furnas, Gosper, Phelps	6 hr
Aug 16, 4:45 PM CDT	Special Weather Statement	GID	Furnas	30 min
Aug 16, 4:59 PM CDT	Special Weather Statement	GID	Sherman	31 min
Aug 16, 5:03 PM CDT	Flash Flood Warning	GID	Furnas	5 hr
Aug 16, 5:24 PM CDT	Areal Flood Advisory	GID	Phelps	5 hr

Nearby

Flash Flood Watches in Nebraska, 2015 Every flash flood watch 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.