Alert archive / Nebraska / Flash Flood Warnings in 2010

Flash Flood Warning 21, NWS Omaha, NE

July 14, 2010Saunders County, Nebraska

NWS Omaha, NE issued this flash flood warning at Jul 14, 2010, 8:07 PM CDT for Saunders County, Nebraska. It was in force for 4 hr. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 14, 2010, 8:07 PM CDT (01:07 UTC)
Expired: Jul 15, 2010, 12:00 AM CDT
In force: 4 hr
Issued by: NWS Omaha, NE
Area: Storm-based polygon
Flood severity: None

County Saunders County, NE

The radar

The Omaha radar (KOAX), 26 km from the middle of the area, began a volume at 01:09 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.

What was reported inside it

Time	Report	Where	Remark
Jul 14, 8:34 PM CDT	HEAVY RAIN 3.65	1 S Yutan, NE
Jul 14, 9:23 PM CDT	HEAVY RAIN 2.8	Ithaca, NE

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 1.1 hours before the alert went out and 26 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: 5182 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 1163 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 128 m²/s²
0-3 km storm-relative helicity: 209 m²/s²
Significant tornado parameter: 5.4
Supercell composite: 30.9

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

411 
WGUS53 KOAX 150107
FFWOAX
NEC155-150500-
/O.NEW.KOAX.FF.W.0021.100715T0107Z-100715T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
807 PM CDT WED JUL 14 2010

THE NATIONAL WEATHER SERVICE IN OMAHA HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHERN SAUNDERS COUNTY IN EAST CENTRAL NEBRASKA

* UNTIL MIDNIGHT CDT

* AT 805 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  SLOW MOVING THUNDERSTORMS WITH VERY HEAVY RAINFALL ACROSS THE   
  WARNED AREA. THERE ARE SOME REPORTS OF OVER 3 INCHES OF RAINFALL
  ACROSS PORTIONS OF THE WARNED AREA.

* RUNOFF FROM THIS EXCESSIVE RAINFALL WILL CAUSE FLASH FLOODING TO
  OCCUR. SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  ASHLAND...MEAD...VALPARAISO...WAHOO AND WESTON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE
BANKS OF CREEKS AND STREAMS. USE ALTERNATE ROUTES AROUND FLOOD PRONE
AREAS.

DO NOT UNDERESTIMATE THE POWER OF FLOOD WATERS. ONLY A FEW INCHES OF
RAPIDLY FLOWING WATER CAN QUICKLY CARRY AWAY YOUR VEHICLE. TURN
AROUND...DONT DROWN.

&&

LAT...LON 4104 9646 4104 9656 4105 9659 4105 9691
      4128 9689 4124 9636 4120 9635 4119 9633
      4115 9632 4111 9631 4109 9634 4104 9633
      4104 9635 4102 9635 4101 9637 4102 9646

$$

KERN

1 follow-up statement

666 
WGUS73 KOAX 150450
FFSOAX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
1150 PM CDT WED JUL 14 2010

NEC155-150505-
/O.EXP.KOAX.FF.W.0021.000000T0000Z-100715T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SAUNDERS NE-
1150 PM CDT WED JUL 14 2010

...THE FLASH FLOOD WARNING THAT WAS IN EFFECT FOR SOUTHERN SAUNDERS
COUNTY WILL BE ALLOWED TO EXPIRE AT MIDNIGHT CDT...

EXCESS RUNOFF FROM HEAVY RAIN HAS ENDED OVER THE WARNED AREA. STREAMS
AND CREEKS IN THE WARNED AREA HAVE RECEDED OR WERE BEGINNING TO
RECEDE...ENDING THE FLOOD THREAT. IF FLOODING HAS BEEN OBSERVED...
PLEASE REPORT IT TO YOUR LOCAL LAW ENFORCEMENT AGENCY.

LAT...LON 4104 9646 4104 9656 4105 9659 4105 9691
      4128 9689 4124 9636 4120 9635 4119 9633
      4115 9632 4111 9631 4109 9634 4104 9633
      4104 9635 4102 9635 4101 9637 4102 9646

$$

KERN

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 14, 7:06 PM CDT	Severe Thunderstorm Warning	OAX	Cass, Douglas, Sarpy, Saunders	39 min
Jul 14, 7:18 PM CDT	Severe Thunderstorm Warning	OAX	Douglas	27 min
Jul 14, 7:22 PM CDT	Severe Thunderstorm Warning	OAX	Lancaster, Saline, Seward	38 min
Jul 14, 7:31 PM CDT	Areal Flood Advisory	OAX	Douglas, Sarpy	3 hr
Jul 14, 7:42 PM CDT	Severe Thunderstorm Warning	OAX	Cass, Sarpy	48 min
Jul 14, 8:28 PM CDT	Severe Thunderstorm Warning	OAX	Cass	47 min
Jul 14, 9:25 PM CDT	Flash Flood Warning	OAX	Otoe	4 hr
Jul 14, 9:25 PM CDT	Severe Thunderstorm Warning	OAX	Otoe	50 min
Jul 14, 9:36 PM CDT	Severe Thunderstorm Warning	OAX	Johnson, Nemaha	39 min
Jul 14, 10:03 PM CDT	Severe Thunderstorm Warning	OAX	Richardson	42 min
Jul 15, 4:24 AM CDT	River Flood Advisory	OAX	Saunders	8 hr
Jul 15, 4:37 AM CDT	River Flood Warning	OAX	Otoe	64 hr
Jul 15, 7:08 AM CDT	River Flood Warning	OAX	Saunders	22 hr
Jul 15, 4:07 PM CDT	River Flood Warning	OAX	Seward	13 hr

Nearby

Flash Flood Warnings in Nebraska, 2010 Every flash flood warning in 2010

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.