Alert archive / Nebraska / Flash Flood Watches in 2018

Flash Flood Watch 9, NWS Omaha, NE

September 3, 201813 counties in Nebraska; Fremont County, Montgomery County, Page County, Iowa

NWS Omaha, NE issued this flash flood watch at Sep 3, 2018, 1:06 PM CDT for 13 counties in Nebraska; Fremont County, Montgomery County, Page County, Iowa. It was in force for 45 hr.

The area

The counties it named.

The facts

Issued: Sep 3, 2018, 1:06 PM CDT (18:06 UTC)
Expired: Sep 5, 2018, 10:35 AM CDT
In force: 45 hr
Issued by: NWS Omaha, NE
Flood severity: None

Counties Fremont County, IA, Montgomery County, IA, Page County, IA, Cass County, NE, Gage County, NE, Jefferson County, NE, Johnson County, NE, Lancaster County, NE, Nemaha County, NE, Otoe County, NE, Pawnee County, NE, Richardson County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE

The radar

The Omaha radar (KOAX), 78 km from the middle of the area, began a volume at 18:07 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

Topeka, KS (KFOE), launched 12:00Z, 6.1 hours before the alert went out and 188 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: 325 J/kg
Mixed-layer CIN: -45 J/kg
Mixed-layer LCL: 826 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 140 m²/s²
0-3 km storm-relative helicity: 119 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 2.0

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 Omaha, NE wrote its last area forecast discussion before this flash flood watch went out at Sep 3, 12:35 PM CDT, 31 minutes earlier.

Area forecast discussion, Sep 3, 12:35 PM CDT, 31 minutes before

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Hazardous weather outlook, Sep 3, 4:11 AM CDT, 8 hours 55 minutes before

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In the hours before

Local storm report, Sep 3, 8:33 AM CDT, 4 hours 33 minutes before

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Local storm report, Sep 3, 11:07 AM CDT, 1 hour 59 minutes before

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Local storm report, Sep 3, 11:08 AM CDT, 1 hour 58 minutes before

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Local storm report, Sep 3, 11:34 AM CDT, 1 hour 32 minutes before

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Local storm report, Sep 3, 11:45 AM CDT, 1 hour 21 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 2, 7:23 PM CDT	Special Weather Statement	OAX	Gage	22 min
Sep 2, 7:43 PM CDT	Special Weather Statement	OAX	Gage	32 min
Sep 2, 8:12 PM CDT	Special Weather Statement	OAX	Gage	33 min
Sep 2, 8:45 PM CDT	Special Weather Statement	OAX	Johnson	30 min
Sep 2, 11:40 PM CDT	Areal Flood Advisory	OAX	Johnson, Nemaha	6 hr

Nearby

Flash Flood Watches in Nebraska, 2018 Flash Flood Watches in Iowa, 2018 Every flash flood watch 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.