Alert archive / Nebraska / Flash Flood Watches in 2007
Flash Flood Watch 5, NWS Omaha, NE
NWS Omaha, NE issued this flash flood watch at May 31, 2007, 3:14 PM CDT for 27 counties in Nebraska; 4 counties in Iowa. It took effect at May 31, 2007, 4:00 PM CDT. It was in force for 23 hr.
The area
The counties it named.
The facts
- Issued
- May 31, 2007, 3:14 PM CDT (20:14 UTC)
- In effect from
- May 31, 2007, 4:00 PM CDT
- Expired
- Jun 1, 2007, 2:54 PM CDT
- In force
- 23 hr
- Issued by
- NWS Omaha, NE
- Flood severity
- None
All 31 counties
Fremont County, IA, Mills County, IA, Montgomery County, IA, Page County, IA, Antelope County, NE, Boone County, NE, Butler County, NE, Cass County, NE, Cedar County, NE, Colfax County, NE, Cuming County, NE, Dodge County, NE, Douglas County, NE, Gage County, NE, Jefferson County, NE, Johnson County, NE, Knox County, NE, Lancaster County, NE, Madison County, NE, Nemaha County, NE, Otoe County, NE, Pawnee County, NE, Pierce County, NE, Platte County, NE, Richardson County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Stanton County, NE, Wayne County, NE
The radar
The Omaha radar (KOAX), 30 km from the middle of the area, began a volume at 20:15 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 12:00Z, 8.2 hours before the alert went out and 30 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
- 1305 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 126 m²/s²
- 0-3 km storm-relative helicity
- 109 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 31, 3:35 AM CDT, 11 hours 39 minutes earlier.
Area forecast discussion, May 31, 3:35 AM CDT, 11 hours 39 minutes before
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</html>Hazardous weather outlook, May 31, 12:07 PM CDT, 3 hours 7 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE OMAHA/VALLEY NE 1207 PM CDT THU MAY 31 2007 IAZ043-055-056-069-079-080-090-091-NEZ011-012-015>018-030>034- 042>045-050>053-065>068-078-088>093-010715- 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- 1207 PM CDT THU MAY 31 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PARTS OF EASTERN NEBRASKA AND SOUTHWEST IOWA. .DAY ONE...THIS AFTERNOON AND TONIGHT SCATTERED THUNDERSTORMS ARE EXPECTED TO DEVELOP OVER THE AREA THIS AFTERNOON. A FEW SEVERE STORMS WILL BE POSSIBLE...GENERALLY SOUTH AND SOUTHEAST OF A COLUMBUS TO WAYNE LINE. A WEAK COLD FRONT WILL BE MOVING THROUGH NEBRASKA THIS AFTERNOON WHICH WILL TRIGGER SCATTERED SHOWERS AND THUNDERSTORMS. ALTHOUGH ONLY A MODERATE AMOUNT OF INSTABILITY IS FORECAST...WIND SHEAR WILL BE FAIRLY STRONG WHICH COULD SUPPORT A FEW SUPERCELLS. LARGE HAIL AND DAMAGING WINDS ARE THE MAIN HAZARD INTO EARLY EVENING. LATER THIS EVENING AND OVERNIGHT A CLUSTER OF STORMS MAY MOVE OUT OF CENTRAL NEBRASKA AND KANSAS INTO THE OUTLOOK AREA. ALTHOUGH THERE IS A THREAT OF LARGE HAIL FROM THESE STORMS...THE MAIN SEVERE WEATHER HAZARDS SHOULD SHIFT TO HEAVY RAIN ALONG WITH STRONG WINDS. SOME RIVERS ARE ALREADY RUNNING HIGH...SO ANY ADDITIONAL HEAVY RAIN FROM THUNDERSTORMS COULD LEAD TO FLOODING PROBLEMS OVER AREAS ALREADY SATURATED. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY THUNDERSTORM CHANCES CONTINUE INTO FRIDAY OVER THE OUTLOOK AREA. A FEW SEVERE STORMS ARE POSSIBLE...GENERALLY FROM FAR SOUTHEAST NEBRASKA INTO SOUTHWEST IOWA. IN ADDITION...HEAVY RAIN REMAINS A THREAT THROUGH EVENING...ALTHOUGH THE RISK OF HEAVY RAIN SHOULD SHIFT INTO FAR SOUTHEAST NEBRASKA AND SOUTHWEST IOWA DURING THE AFTERNOON. THERE IS A CHANCE OF THUNDERSTORMS SATURDAY AFTERNOON AND AGAIN BY NEXT WEDNESDAY. .SPOTTER INFORMATION STATEMENT... STORM SPOTTER ACTIVATION MAY BE NEEDED THIS AFTERNOON AND TONIGHT. RAINFALL AMOUNTS WILL BE ESPECIALLY VALUABLE THROUGH THE WEEKEND. CHERMOK
The office that day
Everything else NWS Omaha, NE issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 31, 2:57 PM CDT | Severe Thunderstorm Warning | OAX | Lancaster, Saline | 48 min |
| May 31, 3:37 PM CDT | Severe Thunderstorm Warning | OAX | Saline, Seward | 38 min |
| May 31, 3:48 PM CDT | Severe Thunderstorm Warning | OAX | Lancaster, Saunders | 42 min |
| May 31, 4:31 PM CDT | Severe Thunderstorm Warning | OAX | Douglas, Saunders | 29 min |
| May 31, 5:06 PM CDT | Severe Thunderstorm Warning | OAX | Washington | 13 min |
| May 31, 6:02 PM CDT | Severe Thunderstorm Warning | OAX | Jefferson | 43 min |
| May 31, 6:43 PM CDT | Severe Thunderstorm Warning | OAX | Gage, Jefferson | 47 min |
| May 31, 4:06 PM CDT | Severe Thunderstorm Warning | OAX | Monona | 39 min |
| May 31, 5:33 PM CDT | Severe Thunderstorm Warning | OAX | Harrison, Monona | 27 min |
Nearby
Flash Flood Watches in Nebraska, 2007Flash Flood Watches in Iowa, 2007Every flash flood watch in 2007
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.