Alert archive / Nebraska / Severe Thunderstorm Watches in 2005

Severe Thunderstorm Watch 749

August 27, 200512 counties in Kansas; 20 counties in Nebraska

The Storm Prediction Center issued this severe thunderstorm watch at Aug 27, 2005, 5:15 PM CDT for 12 counties in Kansas; 20 counties in Nebraska. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Aug 27, 2005, 5:15 PM CDT (22:15 UTC)
Expired: Aug 27, 2005, 11:00 PM CDT
In force: 6 hr
Issued by: the Storm Prediction Center

All 32 counties

Decatur County, KS, Gove County, KS, Graham County, KS, Jewell County, KS, Norton County, KS, Osborne County, KS, Phillips County, KS, Republic County, KS, Rooks County, KS, Sheridan County, KS, Smith County, KS, Trego County, KS, Adams County, NE, Butler County, NE, Clay County, NE, Dodge County, NE, Fillmore County, NE, Franklin County, NE, Furnas County, NE, Hamilton County, NE, Harlan County, NE, Jefferson County, NE, Kearney County, NE, Lancaster County, NE, Nuckolls County, NE, Polk County, NE, Saline County, NE, Saunders County, NE, Seward County, NE, Thayer County, NE, Webster County, NE, York County, NE

The radar

The Grand Island radar (KUEX), 64 km from the middle of the area, began a volume at 22:14 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

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

Issued	Product	Office	Counties	Lasted
Aug 27, 5:31 PM CDT	Severe Thunderstorm Warning	GID	Polk	59 min
Aug 27, 5:37 PM CDT	Severe Thunderstorm Warning	GLD	Sheridan	52 min
Aug 27, 6:32 PM CDT	Severe Thunderstorm Warning	GID	Polk	60 min
Aug 27, 9:40 PM CDT	Severe Thunderstorm Warning	GLD	Decatur	65 min
Aug 27, 10:12 PM CDT	Severe Thunderstorm Warning	GID	Clay	48 min
Aug 27, 10:28 PM CDT	Flash Flood Warning	GLD	Decatur	3 hr
Aug 27, 10:43 PM CDT	Severe Thunderstorm Warning	GLD	Decatur	62 min
Aug 27, 10:48 PM CDT	Severe Thunderstorm Warning	GLD	Norton	59 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 10.3 hours before the alert went out and 179 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: 1434 J/kg
Mixed-layer CIN: -202 J/kg
Mixed-layer LCL: 1289 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 201 m²/s²
0-3 km storm-relative helicity: 244 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.8

Open this sounding in Storm Lab

The text

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

000 
WWUS20 KWNS 272211
SEL9  
SPC WW 272211
KSZ000-NEZ000-280400-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 749
NWS STORM PREDICTION CENTER NORMAN OK
515 PM CDT SAT AUG 27 2005

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF 

       NORTH CENTRAL KANSAS
       SOUTH CENTRAL AND SOUTHEAST NEBRASKA

EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 515 PM UNTIL
1100 PM CDT.

HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 50
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 60 MILES WEST
SOUTHWEST OF HILL CITY KANSAS TO 25 MILES NORTHEAST OF LINCOLN
NEBRASKA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA.
PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
TORNADOES.

DISCUSSION...SCATTERED THUNDERSTORMS ARE EXPECTED TO INCREASE IN
COVERAGE OVER PARTS OF KS/NEB THIS EVENING...IN AXIS OF MOIST/VERY
UNSTABLE AIR MASS.  VERTICAL SHEAR PROFILES ARE RELATIVELY
WEAK...BUT FAVORABLE THERMODYNAMICS WILL POSE A RISK OF DAMAGING
WINDS AND LARGE HAIL IN STRONGER CELLS.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 28025.


...HART

394,1005 415,0962 402,0962 381,1005

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 26, 8:50 PM CDT	Mesoscale Discussion	SPC	Chautauqua, Cherokee, Labette, Montgomery	85 min
Aug 27, 3:52 PM CDT	Mesoscale Discussion	SPC	Decatur, Graham, Jewell, Mitchell, Norton, Osborne and 6 more	113 min
Aug 27, 4:36 PM CDT	Mesoscale Discussion	SPC	Cheyenne, Finney, Gove, Grant, Gray, Greeley and 17 more	84 min
Aug 27, 6:56 PM CDT	Mesoscale Discussion	SPC	Decatur, Finney, Ford, Gove, Graham, Gray and 19 more	2 hr

Nearby

Severe Thunderstorm Watches in Nebraska, 2005 Severe Thunderstorm Watches in Kansas, 2005 Every severe thunderstorm watch in 2005

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.