Alert archive / Nebraska / Areal Flood Advisories in 2018

Areal Flood Advisory 21, NWS North Platte, NE

July 5, 2018Custer County, Nebraska

NWS North Platte, NE issued this areal flood advisory at Jul 5, 2018, 12:24 AM CDT for Custer County, Nebraska. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued: Jul 5, 2018, 12:24 AM CDT (05:24 UTC)
Expired: Jul 5, 2018, 3:37 AM CDT
In force: 3 hr
Issued by: NWS North Platte, NE
Area: Storm-based polygon

County Custer County, NE

The radar

The North Platte radar (KLNX), 94 km from the middle of the area, began a volume at 05:27 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.

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 5.4 hours before the alert went out and 79 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: 2449 J/kg
Mixed-layer CIN: -20 J/kg
Mixed-layer LCL: 1815 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 56 m²/s²
0-3 km storm-relative helicity: 222 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 19.2

Open this sounding in Storm Lab

What forecasters said that day

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

NWS North Platte, NE wrote its last area forecast discussion before this areal flood advisory went out at Jul 5, 12:04 AM CDT, 20 minutes earlier.

Area forecast discussion, Jul 5, 12:04 AM CDT, 20 minutes before

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Hazardous weather outlook, Jul 4, 3:20 PM CDT, 9 hours 4 minutes before

Hazardous Weather Outlook
National Weather Service North Platte NE
320 PM CDT Wed Jul 4 2018

NEZ004>010-022>029-035>038-056>059-069>071-094-052030-
Sheridan-Eastern Cherry-Keya Paha-Boyd-Brown-Rock-Holt-Garden-
Grant-Hooker-Thomas-Blaine-Loup-Garfield-Wheeler-Arthur-McPherson-
Logan-Custer-Deuel-Keith-Perkins-Lincoln-Chase-Hayes-Frontier-
Western Cherry-
320 PM CDT Wed Jul 4 2018 /220 PM MDT Wed Jul 4 2018/

This Hazardous Weather Outlook is for portions of western and
north central Nebraska.

.DAY ONE...TONIGHT.

Strong to locally severe thunderstorms are possible late this
afternoon and evening. The area of concern will be for areas
along and east of a Lewellen through Ainsworth and Spencer line.
Large hail, damaging winds and locally heavy rainfall will be the
greatest threats.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY.

Scattered thunderstorms are possible again Thursday through
Friday. The risk of organized severe weather is low during this
period.

There is another low chance of thunderstorms again on Sunday
night. Again, severe weather potential is low.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed.

&&

Get your weather, hydrological, and climate information at
http://www.weather.gov/northplatte

Roberg

In the hours before

Special weather statement, Jul 4, 9:00 PM CDT, 3 hours 24 minutes before

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Special weather statement, Jul 4, 9:11 PM CDT, 3 hours 13 minutes before

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Local storm report, Jul 4, 9:24 PM CDT, 3 hours before

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Special weather statement, Jul 4, 9:26 PM CDT, 2 hours 58 minutes before

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Special weather statement, Jul 4, 10:12 PM CDT, 2 hours 12 minutes before

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Special weather statement, Jul 4, 10:14 PM CDT, 2 hours 10 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 4, 7:52 PM CDT	Special Weather Statement	LBF	Frontier	38 min
Jul 4, 8:25 PM CDT	Special Weather Statement	LBF	Garfield	50 min
Jul 4, 8:49 PM CDT	Severe Thunderstorm Warning	LBF	Blaine, Custer	41 min
Jul 4, 8:55 PM CDT	Special Weather Statement	LBF	Hayes	50 min
Jul 4, 9:00 PM CDT	Special Weather Statement	LBF	Wheeler	45 min
Jul 4, 9:11 PM CDT	Special Weather Statement	LBF	Garfield	49 min
Jul 4, 9:26 PM CDT	Special Weather Statement	LBF	Custer	49 min
Jul 4, 10:12 PM CDT	Special Weather Statement	LBF	Custer	48 min
Jul 4, 10:14 PM CDT	Special Weather Statement	LBF	Wheeler	46 min

Nearby

Areal Flood Advisories in Nebraska, 2018 Every areal flood advisory in 2018

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.