Alert archive / Nebraska / Flash Flood Warnings in 1999

Flash Flood Warning 21, NWS Omaha, NE

June 27, 1999Lancaster County, Saunders County, Nebraska

NWS Omaha, NE issued this flash flood warning at Jun 27, 1999, 5:03 AM CDT for Lancaster County, Saunders County, Nebraska. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jun 27, 1999, 5:03 AM CDT (10:03 UTC)
Expired
Jun 27, 1999, 8:05 AM CDT
In force
3 hr
Issued by
NWS Omaha, NE
Area
Whole counties

Counties Lancaster County, NE, Saunders County, NE

The radar

The Omaha radar (KOAX), 43 km from the middle of the area, began a volume at 10:08 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, 10.1 hours before the alert went out and 43 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 1999-06-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1150 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 1999-06-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 29 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
1150 J/kg
Mixed-layer CIN
-33 J/kg
Mixed-layer LCL
1565 m above ground
0-6 km bulk shear
24 kt
0-1 km storm-relative helicity
29 m²/s²
0-3 km storm-relative helicity
117 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.8

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KOMA 271003
FFWOMA
NEC109-155-271305-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
503 AM CDT SUN JUN 27 1999

THE NATIONAL WEATHER SERVICE IN OMAHA HAS ISSUED A

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

* UNTIL 805 AM CDT

* AT 445 AM CDT... HEAVY RAIN HAD FALLEN ACROSS SAUNDERS AND PARTS OF
  LANCASTER COUNTIES EARLY THIS MORNING WITH MORE STORMS AND HEAVY
  RAIN EXPECTED TO MOVE THROUGH THIS SAME AREA THROUGH 7 AM.

SOME STREAMS AFFECTED INCLUDE...SALT CREEK AND WAHOO CREEK.

DO NOT DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.  THE WATER
DEPTH MAY BE TOO GREAT TO ALLOW YOUR VEHICLE TO CROSS SAFELY.

DF

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 27, 2:47 AM CDTFlash Flood WarningOAXPlatte3 hr
Jun 27, 3:16 AM CDTSevere Thunderstorm WarningOAXButler49 min
Jun 27, 4:50 AM CDTSevere Thunderstorm WarningOAXJefferson, Saline45 min
Jun 27, 5:25 AM CDTSevere Thunderstorm WarningOAXGage45 min
Jun 27, 6:04 AM CDTFlash Flood WarningOAXButler2 hr
Jun 27, 8:15 AM CDTFlash Flood WarningOAXButler, Lancaster, Saunders85 min

Nearby

Flash Flood Warnings in Nebraska, 1999Every flash flood warning in 1999

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.