Alert archive / Nebraska / Areal Flood Advisories in 2021

Areal Flood Advisory 4, NWS North Platte, NE

May 16, 2021Sheridan County, Nebraska

NWS North Platte, NE issued this areal flood advisory at May 16, 2021, 3:38 AM MDT for Sheridan County, Nebraska. It was in force for 101 min.

The area

The counties it named.

The facts

Issued: May 16, 2021, 3:38 AM MDT (09:38 UTC)
Expired: May 16, 2021, 5:19 AM MDT
In force: 101 min
Issued by: NWS North Platte, NE
Area: Storm-based polygon

County Sheridan County, NE

The radar

The North Platte radar (KLNX), 163 km from the middle of the area, began a volume at 09:42 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, 9.6 hours before the alert went out and 214 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: 266 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 1597 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: -5 m²/s²
0-3 km storm-relative helicity: 90 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

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 May 16, 3:04 AM MDT, 34 minutes earlier.

Area forecast discussion, May 16, 3:04 AM MDT, 34 minutes before

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Hazardous weather outlook, May 16, 3:34 AM MDT, 4 minutes before

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In the hours before

Special weather statement, May 15, 9:56 PM MDT, 5 hours 42 minutes before

Special Weather Statement
National Weather Service North Platte NE
956 PM MDT Sat May 15 2021

NEZ058-160445-
Perkins NE-
956 PM MDT Sat May 15 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN PERKINS COUNTY UNTIL
1045 PM MDT...

At 955 PM MDT, Doppler radar was tracking a strong thunderstorm near
Madrid, or near Grant, moving southeast at 10 mph.

Nickel size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Madrid.

This includes Highway 61 between mile markers 55 and 64.

LAT...LON 4072 10169 4083 10174 4091 10153 4071 10135
TIME...MOT...LOC 0355Z 334DEG 10KT 4081 10160

Taylor

Special weather statement, May 15, 11:08 PM MDT, 4 hours 30 minutes before

Special Weather Statement
National Weather Service North Platte NE
1208 AM CDT Sun May 16 2021

NEZ058-059-160600-
Perkins NE-Lincoln NE-
1208 AM CDT Sun May 16 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN PERKINS AND
SOUTHWESTERN LINCOLN COUNTIES UNTIL 100 AM CDT/MIDNIGHT MDT/...

At 1207 AM CDT/1107 PM MDT/, Doppler radar was tracking a strong
thunderstorm near Madrid, or 12 miles east of Grant, moving east at
10 mph.

Nickel size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Madrid, Elsie and Grainton.

LAT...LON 4074 10155 4084 10158 4097 10129 4070 10122
TIME...MOT...LOC 0507Z 262DEG 8KT 4082 10149

Gomez

Local storm report, May 15, 11:54 PM MDT, 3 hours 44 minutes before

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Local storm report, May 15, 11:55 PM MDT, 3 hours 43 minutes before

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Local storm report, May 16, 12:08 AM MDT, 3 hours 30 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
May 15, 6:01 PM MDT	Special Weather Statement	LBF	Chase	44 min
May 15, 6:03 PM MDT	Special Weather Statement	LBF	Perkins	42 min
May 15, 6:31 PM MDT	Special Weather Statement	LBF	Lincoln	44 min
May 15, 6:42 PM MDT	Severe Thunderstorm Warning	LBF	Perkins	48 min
May 15, 6:48 PM MDT	Special Weather Statement	LBF	Arthur	42 min
May 15, 7:06 PM MDT	Severe Thunderstorm Warning	LBF	Lincoln	39 min
May 15, 7:13 PM MDT	Severe Thunderstorm Warning	LBF	Keith	47 min
May 15, 7:35 PM MDT	Special Weather Statement	LBF	Perkins	40 min
May 15, 7:44 PM MDT	Severe Thunderstorm Warning	LBF	Perkins	46 min
May 15, 8:06 PM MDT	Special Weather Statement	LBF	Lincoln	39 min
May 15, 8:07 PM MDT	Special Weather Statement	LBF	Custer	38 min
May 15, 8:23 PM MDT	Severe Thunderstorm Warning	LBF	Lincoln	52 min
May 15, 8:42 PM MDT	Special Weather Statement	LBF	Perkins	48 min
May 15, 9:56 PM MDT	Special Weather Statement	LBF	Perkins	49 min
May 15, 11:08 PM MDT	Special Weather Statement	LBF	Perkins	52 min
May 15, 11:21 PM MDT	Areal Flood Warning	LBF	Lincoln, Perkins	4 hr
May 16, 3:16 AM MDT	Areal Flood Advisory	LBF	Cherry, Grant, Hooker	3 hr

Nearby

Areal Flood Advisories in Nebraska, 2021 Every areal flood advisory in 2021

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.