Alert archive / Nebraska / Flash Flood Warnings in 2012

Flash Flood Warning 7, NWS Omaha, NE

May 3, 2012Saline County, Seward County, Nebraska

NWS Omaha, NE issued this flash flood warning at May 3, 2012, 2:08 AM CDT for Saline County, Seward County, Nebraska. It was in force for 6 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
May 3, 2012, 2:08 AM CDT (07:08 UTC)
Expired
May 3, 2012, 8:00 AM CDT
In force
6 hr
Issued by
NWS Omaha, NE
Area
Storm-based polygon
Flood severity
None

Counties Saline County, NE, Seward County, NE

The radar

The Omaha radar (KOAX), 97 km from the middle of the area, began a volume at 07:11 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, 7.1 hours before the alert went out and 97 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-pSkew-T log-p diagram, Omaha, NE at 00:00Z on 2012-05-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2533 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Omaha, NE at 00:00Z on 2012-05-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 46 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
2533 J/kg
Mixed-layer CIN
-7 J/kg
Mixed-layer LCL
1223 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
46 m²/s²
0-3 km storm-relative helicity
102 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.4

Open this sounding in Storm Lab

The text

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

454 
WGUS53 KOAX 030708
FFWOAX

NEC151-159-031300-
/O.NEW.KOAX.FF.W.0007.120503T0708Z-120503T1300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE OMAHA/VALLEY NEBRASKA
208 AM CDT THU MAY 3 2012

THE NATIONAL WEATHER SERVICE IN OMAHA HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SEWARD COUNTY IN  NEBRASKA...
  SALINE COUNTY IN  NEBRASKA...

* UNTIL 800 AM CDT

* AT 206 AM CDT...DOPPLER RADAR INDICATED THUNDERSTORMS PRODUCING 
  HEAVY RAIN ACROSS THE WARNED AREA. TWO TO THREE INCHES OF RAIN 
  HAVE ALREADY FALLEN. FLASH FLOODING IS EXPECTED TO BEGIN SHORTLY. 

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  MILFORD...FRIEND...DORCHESTER...PLEASANT DALE AND CORDOVA. 

ADDITIONAL RAINFALL AMOUNTS OF TWO TO THREE INCHES ARE POSSIBLE IN 
THE WARNED AREA.

THIS INCLUDES THE FOLLOWING STREAMS AND DRAINAGES...BIG BLUE RIVER...
COON CREEK...WEST FORK BIG BLUE RIVER...SAND CREEK...TURKEY CREEK...
DRY BRANCH...NORTH FORK SWAN CREEK...JOHNSON CREEK...NORTH FORK 
JOHNSON CREEK...SOUTH FORK JOHNSON CREEK...WALNUT CREEK...INDIAN 
CREEK...CHEESE CREEK...WOLF CREEK...SOUTH BRANCH MIDDLE CREEK...
CULVER CREEK...HOLMES CREEK AND SOUTH BRANCH CROOKED CREEK.

THIS INCLUDES INTERSTATE 80 IN NEBRASKA NEAR MILE MARKER 388.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE 
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. 
MOVE UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS.  DO NOT STAY IN 
AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING. 

&&

LAT...LON 4074 9737 4084 9691 4067 9693 4052 9736

$$

DERGAN

The office that day

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

IssuedProductOfficeCountiesLasted
May 2, 7:58 PM CDTSpecial Weather StatementOAXBoone32 min
May 2, 8:05 PM CDTSevere Thunderstorm WarningOAXBoone25 min
May 2, 8:28 PM CDTSevere Thunderstorm WarningOAXBoone32 min
May 2, 9:11 PM CDTSevere Thunderstorm WarningOAXPlatte34 min
May 2, 9:34 PM CDTSpecial Weather StatementOAXPierce26 min
May 2, 10:08 PM CDTSpecial Weather StatementOAXBoone37 min
May 2, 10:17 PM CDTSevere Thunderstorm WarningOAXBoone, Platte28 min
May 2, 10:26 PM CDTSevere Thunderstorm WarningOAXBoone, Platte34 min
May 2, 10:45 PM CDTSevere Thunderstorm WarningOAXPlatte45 min
May 2, 11:05 PM CDTSevere Thunderstorm WarningOAXSaline, Seward40 min
May 2, 11:16 PM CDTSpecial Weather StatementOAXWayne44 min
May 2, 11:26 PM CDTSevere Thunderstorm WarningOAXMadison, Platte, Stanton49 min
May 2, 11:30 PM CDTSevere Thunderstorm WarningOAXCedar, Wayne45 min
May 2, 11:46 PM CDTSevere Thunderstorm WarningOAXSaline, Seward44 min
May 2, 11:51 PM CDTSevere Thunderstorm WarningOAXSaline39 min
May 2, 11:57 PM CDTSevere Thunderstorm WarningOAXColfax, Platte, Stanton48 min
May 3, 12:22 AM CDTSevere Thunderstorm WarningOAXGage, Lancaster, Saline, Seward23 min
May 3, 12:36 AM CDTSevere Thunderstorm WarningOAXColfax, Dodge39 min
May 3, 12:47 AM CDTSevere Thunderstorm WarningOAXCass, Gage, Lancaster, Otoe, Sarpy, Saunders28 min
May 3, 1:15 AM CDTSevere Thunderstorm WarningOAXDodge, Saunders, Washington33 min
May 3, 1:15 AM CDTSevere Thunderstorm WarningOAXCass, Douglas, Sarpy30 min
May 3, 1:46 AM CDTSpecial Weather StatementOAXDouglas, Sarpy29 min

Nearby

Flash Flood Warnings in Nebraska, 2012Every flash flood warning in 2012

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.