Alert archive / Nebraska / Flash Flood Watches in 2017
Flash Flood Watch 1, NWS Omaha, NE
NWS Omaha, NE issued this flash flood watch at May 18, 2017, 2:02 PM CDT for 13 counties in Nebraska. It took effect at May 18, 2017, 7:00 PM CDT. It was in force for 30 hr.
The area
The counties it named.
The facts
- Issued
- May 18, 2017, 2:02 PM CDT (19:02 UTC)
- In effect from
- May 18, 2017, 7:00 PM CDT
- Expired
- May 20, 2017, 1:00 AM CDT
- In force
- 30 hr
- Issued by
- NWS Omaha, NE
- Flood severity
- None
Counties Butler County, NE, 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, Saunders County, NE, Seward County, NE
The radar
The Omaha radar (KOAX), 82 km from the middle of the area, began a volume at 19:04 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, 7.0 hours before the alert went out and 192 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1033 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 204 m²/s²
- 0-3 km storm-relative helicity
- 335 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 May 17, 6:12 PM CDT, 19 hours 50 minutes earlier.
Area forecast discussion, May 17, 6:12 PM CDT, 19 hours 50 minutes before
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</html>Hazardous weather outlook, May 17, 6:51 PM CDT, 19 hours 11 minutes before
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Flash Flood Watches in Nebraska, 2017Every flash flood watch in 2017
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.