Alert archive / Nebraska / Mesoscale Discussions in 2003

Mesoscale Discussion 2007

July 27, 20035 counties in Colorado; 9 counties in Nebraska; Laramie County, Wyoming

The Storm Prediction Center issued this mesoscale discussion at Jul 27, 2003, 6:31 PM MDT for 5 counties in Colorado; 9 counties in Nebraska; Laramie County, Wyoming. It was in force for 119 min.

The area

The outline as issued.

The facts

Issued
Jul 27, 2003, 6:31 PM MDT (00:31 UTC)
Expired
Jul 27, 2003, 8:30 PM MDT
In force
119 min
Issued by
the Storm Prediction Center

Counties Logan County, CO, Morgan County, CO, Phillips County, CO, Sedgwick County, CO, Weld County, CO, Banner County, NE, Box Butte County, NE, Cheyenne County, NE, Deuel County, NE, Garden County, NE, Kimball County, NE, Morrill County, NE, Scotts Bluff County, NE, Sioux County, NE, Laramie County, WY

The radar

The Cheyenne radar (KCYS), 57 km from the middle of the area, began a volume at 00:33 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.

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 0.5 hours before the alert went out and 163 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, Denver, CO at 00:00Z on 2003-07-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 653 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, Denver, CO at 00:00Z on 2003-07-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 23 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
653 J/kg
Mixed-layer CIN
-25 J/kg
Mixed-layer LCL
1971 m above ground
0-6 km bulk shear
8 kt
0-1 km storm-relative helicity
23 m²/s²
0-3 km storm-relative helicity
30 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.

584 
ACUS11 KWNS 280031
SWOMCD
SPC MCD 280031 
NEZ000-COZ000-WYZ000-280230-

MESOSCALE DISCUSSION 2007
NWS STORM PREDICTION CENTER NORMAN OK
0731 PM CDT SUN JUL 27 2003

AREAS AFFECTED...SERN WY...NERN CO AND THE NEB PANHANDLE

CONCERNING...SEVERE THUNDERSTORM WATCH 810...

VALID 280031Z - 280230Z

THREAT FOR SEVERE HAIL/DAMAGING WINDS CONTINUES ACROSS THE NEB
PANHANDLE INTO NERN CO FOR THE NEXT FEW HOURS. 

ISOLATED STRONG-SEVERE THUNDERSTORMS TO THE NORTH OF THE BFF AREA
WILL CONTINUE TO PROPAGATE SSEWD INTO THE INSTABILITY GRADIENT.
STORM MERGERS ARE POSSIBLE OVER THE NEXT HOUR. THIS MAY AID IN
SUFFICIENT ENOUGH COLD POOL GENERATION TO DEVELOP AN INCREASING
DAMAGING WIND THREAT/BOWING LINE OVER THE NEB PANHANDLE. IF
CONVECTION DOES NOT INTENSIFY AND FORM A COLD POOL...THEN LACK OF
STRONG INFLOW COUPLED WITH INCREASING INHIBITION WOULD LIKELY LEAD
TO A END TO THE THREAT FOR SEVERE BEFORE WW EXPIRATION TIME 28/04Z.

..CROSBIE.. 07/28/2003

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

ATTN...WFO...LBF...GLD...BOU...CYS...

40050526 41140543 41720457 42580389 42590238 40030207

Nearby

Mesoscale Discussions in Nebraska, 2003Mesoscale Discussions in Colorado, 2003Mesoscale Discussions in Wyoming, 2003Every mesoscale discussion in 2003

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.