Alert archive / Nebraska / Mesoscale Discussions in 2004

Mesoscale Discussion 565

May 5, 20045 counties in Kansas; 24 counties in Nebraska; Gregory County, South Dakota

The Storm Prediction Center issued this mesoscale discussion at May 5, 2004, 3:05 PM CDT for 5 counties in Kansas; 24 counties in Nebraska; Gregory County, South Dakota. It was in force for 115 min.

The area

The outline as issued.

The facts

Issued: May 5, 2004, 3:05 PM CDT (20:05 UTC)
Expired: May 5, 2004, 5:00 PM CDT
In force: 115 min
Issued by: the Storm Prediction Center

All 30 counties

Decatur County, KS, Norton County, KS, Rawlins County, KS, Sheridan County, KS, Thomas County, KS, Blaine County, NE, Boyd County, NE, Brown County, NE, Buffalo County, NE, Custer County, NE, Dawson County, NE, Frontier County, NE, Furnas County, NE, Garfield County, NE, Gosper County, NE, Harlan County, NE, Hayes County, NE, Hitchcock County, NE, Holt County, NE, Keya Paha County, NE, Lincoln County, NE, Logan County, NE, Loup County, NE, Phelps County, NE, Red Willow County, NE, Rock County, NE, Sherman County, NE, Thomas County, NE, Valley County, NE, Gregory County, SD

The radar

The North Platte radar (KLNX), 107 km from the middle of the area, began a volume at 20:04 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

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 8.1 hours before the alert went out and 37 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1318 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 465 m²/s²
0-3 km storm-relative helicity: 549 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

264 
ACUS11 KWNS 052006
SWOMCD
SPC MCD 052005 
SDZ000-NEZ000-KSZ000-052200-

MESOSCALE DISCUSSION 0565
NWS STORM PREDICTION CENTER NORMAN OK
0305 PM CDT WED MAY 05 2004

AREAS AFFECTED...NWRN KS/CENTRAL  AND SWRN NEB/SCENTRAL SD

CONCERNING...CONVECTIVE TRENDS 

VALID 052005Z - 052200Z

STRONG HEATING HAS CREATED VERY STEEP LAPSE RATES 9-9.5 C/KM IN THE
HIGH PLAINS OF WRN NEB/ERN CO. SURFACE TROUGH/DRY LINE LOCATED FROM
NEAR GLD NEWD TO E OF VTN SEPARATES THE QUITE DRY AIR MASS TO THE W
FROM MARGINALLY MOIST AND DEEPLY MIXED AIR FROM S CENTRAL SD TO NWRN
KS.

THE HIGH BASED CONVECTION THAT HAS DEVELOPED W OF DRY LINE FROM NWRN
CORNER KS NWD INTO NEB PANHANDLE  EXPECTED TO MOVE EWD ACROSS THE
DRY LINE REMAINDER OF AFTERNOON.  SUFFICIENT MUCAPE...1000-1500
J/KG...E OF DRY LINE WILL BE AVAILABLE FOR THUNDERSTORMS TO
INTENSIFY EWD ACROSS CENTRAL NEB.  THE POTENTIAL FOR SEVERE WILL BE
ISOLATED WITH THE LACK OF STRONG SHEAR AND LITTLE UPPER SUPPORT. 
HOWEVER THE VERY STEEP LAPSE RATES AND HIGH BASES SUGGEST DAMAGING
MICRO BURSTS ARE LIKELY WITH THE MOST INTENSE STORMS.

..HALES.. 05/05/2004

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...FSD...ABR...GID...LBF...UNR...GLD...

39370126 40450140 41600078 42380014 43829947 43479865
41089866 39689941 39240069

Nearby

Mesoscale Discussions in Nebraska, 2004 Mesoscale Discussions in Kansas, 2004 Mesoscale Discussions in South Dakota, 2004 Every mesoscale discussion in 2004

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.