Alert archive / Nebraska / Flash Flood Watches in 2018
Flash Flood Watch 3, NWS Omaha, NE
NWS Omaha, NE issued this flash flood watch at Jun 20, 2018, 4:30 AM CDT for 6 counties in Nebraska; 4 counties in Iowa. It took effect at Jun 20, 2018, 1:00 PM CDT. It was in force for 15 hr.
The area
The counties it named.
The facts
- Issued
- Jun 20, 2018, 4:30 AM CDT (09:30 UTC)
- In effect from
- Jun 20, 2018, 1:00 PM CDT
- Expired
- Jun 21, 2018, 4:11 AM CDT
- In force
- 15 hr
- Issued by
- NWS Omaha, NE
- Flood severity
- None
Counties Harrison County, IA, Monona County, IA, Pottawattamie County, IA, Shelby County, IA, Burt County, NE, Cedar County, NE, Cuming County, NE, Knox County, NE, Thurston County, NE, Wayne County, NE
The radar
The Omaha radar (KOAX), 77 km from the middle of the area, began a volume at 09:29 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
Omaha, NE (KOAX), launched 00:00Z, 9.5 hours before the alert went out and 77 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
- 1806 J/kg
- Mixed-layer CIN
- -39 J/kg
- Mixed-layer LCL
- 818 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 16 m²/s²
- 0-3 km storm-relative helicity
- 64 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.1
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 Jun 20, 3:58 AM CDT, 32 minutes earlier.
Area forecast discussion, Jun 20, 3:58 AM CDT, 32 minutes before
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</html>Hazardous weather outlook, Jun 19, 10:46 PM CDT, 5 hours 44 minutes before
Hazardous Weather Outlook National Weather Service Omaha/Valley NE 1046 PM CDT Tue Jun 19 2018 IAZ043-055-056-069-079-080-090-091-NEZ011-012-015>018-030>034- 042>045-050>053-065>068-078-088>093-201800- Monona-Harrison-Shelby-Pottawattamie-Mills-Montgomery-Fremont- Page-Knox-Cedar-Thurston-Antelope-Pierce-Wayne-Boone-Madison- Stanton-Cuming-Burt-Platte-Colfax-Dodge-Washington-Butler- Saunders-Douglas-Sarpy-Seward-Lancaster-Cass-Otoe-Saline- Jefferson-Gage-Johnson-Nemaha-Pawnee-Richardson- 1046 PM CDT Tue Jun 19 2018 This Hazardous Weather Outlook is for portions of southwest Iowa...west central Iowa...east central Nebraska...northeast Nebraska and southeast Nebraska. .DAY ONE...Tonight and Wednesday Some strong thunderstorms will occur across much of eastern Nebraska and southwest Iowa overnight, with areas of heavy rain. Flooding could develop in areas that received over 3 inches of rain Monday night and Tuesday morning. A flash flood watch is in effect for portions of the area. A few storms may be severe with damaging winds and hail. Thunderstorms will be possible again Wednesday, but the intensity is expected to be weaker. .DAYS TWO THROUGH SEVEN...Wednesday night through Tuesday Thunderstorm chances will remain in the forecast Wednesday night into Thursday night. Occasional periods of heavy rain are possible. Thunderstorm chances return to part of the area Saturday and Saturday night and continue into early next week. .SPOTTER INFORMATION STATEMENT... Storm spotter activation is not expected to be needed overnight or on Wednesday, but please pass along any reports of severe weather or flooding.
In the hours before
Local storm report, Jun 19, 10:30 PM CDT, 6 hours before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
1030 PM CDT TUE JUN 19 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1030 PM HEAVY RAIN 1 N FAIRBURY 40.15N 97.18W
06/19/2018 M3.20 INCH JEFFERSON NE EMERGENCY MNGR
&&
HDSpecial weather statement, Jun 19, 11:09 PM CDT, 5 hours 21 minutes before
Special Weather Statement National Weather Service Omaha/Valley Nebraska 1109 PM CDT TUE JUN 19 2018 IAZ055-056-069-079-080-090-091-200445- Pottawattamie IA-Mills IA-Page IA-Fremont IA-Montgomery IA-Shelby IA- Harrison IA- 1109 PM CDT TUE JUN 19 2018 ...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN FREMONT...WESTERN MONTGOMERY...MILLS...POTTAWATTAMIE...SOUTHEASTERN HARRISON...WESTERN SHELBY AND NORTHWESTERN PAGE COUNTIES UNTIL 1145 PM CDT... At 1109 PM CDT, Doppler radar was tracking strong thunderstorms along a line extending from 3 miles southwest of Logan to 6 miles northwest of Treynor to 7 miles northwest of Sidney. Movement was east at 30 mph. Winds in excess of 40 mph will be possible with these storms. Locations impacted include... Eastern Council Bluffs, Glenwood, Shenandoah, Missouri Valley, Logan, Oakland, Malvern, Treynor, Underwood, Carson, Essex, Shelby, Minden, Emerson, Persia, Macedonia, Woodbine, Tabor, Neola and Crescent. PRECAUTIONARY/PREPAREDNESS ACTIONS... Torrential rainfall is also occurring with these storms, and may lead to localized flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 4185 9546 4069 9525 4077 9573 4168 9593 TIME...MOT...LOC 0409Z 263DEG 27KT 4163 9585 4128 9571 4082 9575 SMITH
The office that day
Everything else NWS Omaha, NE issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 19, 7:15 PM CDT | Areal Flood Advisory | OAX | Lancaster | 3 hr |
| Jun 19, 7:47 PM CDT | Areal Flood Advisory | OAX | Seward | 3 hr |
| Jun 19, 7:56 PM CDT | Areal Flood Advisory | OAX | Jefferson | 64 min |
| Jun 19, 8:48 PM CDT | Flash Flood Warning | OAX | Jefferson | 6 hr |
| Jun 19, 9:20 PM CDT | Special Weather Statement | OAX | Saunders | 25 min |
| Jun 19, 11:13 PM CDT | Areal Flood Advisory | OAX | Gage | 5 hr |
| Jun 19, 11:24 PM CDT | Areal Flood Advisory | OAX | Cass, Douglas, Sarpy | 5 hr |
| Jun 19, 11:29 PM CDT | Flash Flood Warning | OAX | Washington | 4 hr |
| Jun 20, 12:58 AM CDT | River Flood Warning | OAX | Otoe | 37 hr |
| Jun 20, 2:39 AM CDT | Areal Flood Warning | OAX | Jefferson | 6 hr |
| Jun 20, 10:16 AM CDT | River Flood Warning | OAX | Cass | 24 hr |
| Jun 20, 10:25 AM CDT | River Flood Warning | OAX | Pierce | 23 hr |
| Jun 20, 10:41 AM CDT | Areal Flood Advisory | OAX | Jefferson | 5 hr |
| Jun 20, 6:22 PM CDT | River Flood Warning | OAX | Saunders | 31 hr |
| Jun 19, 9:47 PM CDT | Special Weather Statement | OAX | Montgomery | 43 min |
| Jun 19, 9:53 PM CDT | Areal Flood Advisory | OAX | Mills, Pottawattamie | 5 hr |
| Jun 19, 11:09 PM CDT | Special Weather Statement | OAX | Harrison, Mills, Pottawattamie | 36 min |
Nearby
Flash Flood Watches in Nebraska, 2018Flash Flood Watches in Iowa, 2018Every 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.