Alert archive / Nebraska / Severe Thunderstorm Watches in 2001

Severe Thunderstorm Watch 446

June 18, 2001Crawford County, Harrison County, Monona County, Iowa; 37 counties in Nebraska

The Storm Prediction Center issued this severe thunderstorm watch at Jun 18, 2001, 5:30 PM CDT for Crawford County, Harrison County, Monona County, Iowa; 37 counties in Nebraska. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Jun 18, 2001, 5:30 PM CDT (22:30 UTC)
Expired
Jun 18, 2001, 11:00 PM CDT
In force
6 hr
Issued by
the Storm Prediction Center
All 40 counties

Crawford County, IA, Harrison County, IA, Monona County, IA, Adams County, NE, Boone County, NE, Buffalo County, NE, Burt County, NE, Butler County, NE, Clay County, NE, Colfax County, NE, Cuming County, NE, Dodge County, NE, Douglas County, NE, Fillmore County, NE, Franklin County, NE, Furnas County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Harlan County, NE, Howard County, NE, Jefferson County, NE, Kearney County, NE, Lancaster County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Nuckolls County, NE, Phelps County, NE, Platte County, NE, Polk County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Stanton County, NE, Thayer County, NE, Washington County, NE, Webster County, NE, York County, NE

The radar

The Grand Island radar (KUEX), 66 km from the middle of the area, began a volume at 22:33 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.

Warnings issued inside it

20 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Jun 18, 5:46 PM CDTSevere Thunderstorm WarningGIDBuffalo, Dawson29 min
Jun 18, 6:45 PM CDTSevere Thunderstorm WarningOAXButler30 min
Jun 18, 7:05 PM CDTSevere Thunderstorm WarningOAXMonona40 min
Jun 18, 7:18 PM CDTSevere Thunderstorm WarningOAXButler27 min
Jun 18, 7:31 PM CDTTornado WarningOAXHarrison29 min
Jun 18, 7:32 PM CDTSevere Thunderstorm WarningOAXDodge, Washington43 min
Jun 18, 7:45 PM CDTSevere Thunderstorm WarningOAXButler, Seward30 min
Jun 18, 7:57 PM CDTTornado WarningOAXHarrison33 min
Jun 18, 8:00 PM CDTSevere Thunderstorm WarningDMXCrawford40 min
Jun 18, 8:01 PM CDTSevere Thunderstorm WarningOAXBurt14 min
Jun 18, 8:07 PM CDTSevere Thunderstorm WarningOAXLancaster, Saunders38 min
Jun 18, 8:16 PM CDTSevere Thunderstorm WarningOAXWashington44 min
Jun 18, 8:28 PM CDTSevere Thunderstorm WarningOAXHarrison, Shelby47 min
Jun 18, 8:41 PM CDTSevere Thunderstorm WarningOAXLancaster49 min
Jun 18, 8:51 PM CDTSevere Thunderstorm WarningOAXDouglas39 min
Jun 18, 8:53 PM CDTSevere Thunderstorm WarningDMXAudubon, Carroll, Crawford42 min
Jun 18, 8:56 PM CDTSevere Thunderstorm WarningOAXSaline19 min
Jun 18, 9:47 PM CDTSevere Thunderstorm WarningGIDFillmore43 min
Jun 18, 9:50 PM CDTSevere Thunderstorm WarningOAXJefferson, Saline40 min
Jun 18, 10:34 PM CDTSevere Thunderstorm WarningOAXGage, Jefferson41 min

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 10.5 hours before the alert went out and 211 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, N. Platte/Lee Bi, NE at 12:00Z on 2001-06-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2 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, N. Platte/Lee Bi, NE at 12:00Z on 2001-06-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 88 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
2 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2981 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
88 m²/s²
0-3 km storm-relative helicity
97 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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.

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 18, 1:30 AM CDTSevere Thunderstorm WatchSPCAllamakee, Benton, Black Hawk, Bremer, Buchanan, Butler and 23 more6 hr
Jun 18, 6:00 PM CDTSevere Thunderstorm WatchSPCBuena Vista, Calhoun, Cherokee, Clay, Dickinson, Emmet and 11 more5 hr

Nearby

Severe Thunderstorm Watches in Nebraska, 2001Severe Thunderstorm Watches in Iowa, 2001Every severe thunderstorm watch in 2001

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.