Alert archive / Nebraska / Flash Flood Warnings in 1999

Flash Flood Warning 33, NWS Omaha, NE

July 31, 1999Gage County, Nebraska

NWS Omaha, NE issued this flash flood warning at Jul 31, 1999, 5:38 AM CDT for Gage 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
Jul 31, 1999, 5:38 AM CDT (10:38 UTC)
Expired
Jul 31, 1999, 9:00 AM CDT
In force
3 hr
Issued by
NWS Omaha, NE
Area
Whole counties

County Gage County, NE

The radar

The Omaha radar (KOAX), 121 km from the middle of the area, began a volume at 10:37 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

Topeka, KS (KTOP), launched 00:00Z, 10.6 hours before the alert went out and 167 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, Topeka, KS at 00:00Z on 1999-07-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 875 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, Topeka, KS at 00:00Z on 1999-07-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 52 square meters per square second.1939Sfc1 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
875 J/kg
Mixed-layer CIN
-114 J/kg
Mixed-layer LCL
2578 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
52 m²/s²
0-3 km storm-relative helicity
208 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 30, 7:59 PM CDTSevere Thunderstorm WarningOAXBurt36 min
Jul 30, 10:34 PM CDTSevere Thunderstorm WarningOAXOtoe21 min
Jul 30, 8:33 PM CDTSevere Thunderstorm WarningOAXMonona32 min
Jul 30, 10:35 PM CDTSevere Thunderstorm WarningOAXFremont50 min
Jul 30, 11:00 PM CDTSevere Thunderstorm WarningOAXPage60 min
Jul 30, 11:44 PM CDTSevere Thunderstorm WarningOAXShelby36 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.