Alert archive / Nebraska / Mesoscale Discussions in 2008

Mesoscale Discussion 1908

July 25, 200826 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Jul 25, 2008, 1:21 AM CDT for 26 counties in Nebraska. It was in force for 84 min.

The area

The outline as issued.

The facts

Issued: Jul 25, 2008, 1:21 AM CDT (06:21 UTC)
Expired: Jul 25, 2008, 2:45 AM CDT
In force: 84 min
Issued by: the Storm Prediction Center

All 26 counties

Adams County, NE, Antelope County, NE, Boone County, NE, Buffalo County, NE, Custer County, NE, Dawson County, NE, Frontier County, NE, Furnas County, NE, Garfield County, NE, Gosper County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Hayes County, NE, Hitchcock County, NE, Holt County, NE, Howard County, NE, Kearney County, NE, Loup County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Phelps County, NE, Sherman County, NE, Valley County, NE, Wheeler County, NE

The radar

The North Platte radar (KLNX), 106 km from the middle of the area, began a volume at 06:23 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 00:00Z, 6.4 hours before the alert went out and 103 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: 1529 J/kg
Mixed-layer CIN: -19 J/kg
Mixed-layer LCL: 2036 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: -53 m²/s²
0-3 km storm-relative helicity: 4 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -1.1

Open this sounding in Storm Lab

The text

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

000 
ACUS11 KWNS 250621
SWOMCD
SPC MCD 250621 
NEZ000-250745-

MESOSCALE DISCUSSION 1908
NWS STORM PREDICTION CENTER NORMAN OK
0121 AM CDT FRI JUL 25 2008

AREAS AFFECTED...CENTRAL NEB

CONCERNING...SEVERE THUNDERSTORM WATCH 748...

VALID 250621Z - 250745Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 748
CONTINUES.

SEVERE TSTM WATCH 748 CONTINUES UNTIL 08Z ACROSS WEST CENTRAL
NEB...WITH A RISK FOR DAMAGING WINDS/SEVERE HAIL. A WATCH EXTENSION
MAY BE NEEDED SOON ACROSS CENTRAL NEB...AND WILL MONITOR FOR AN
ADDITIONAL WATCH FATHER DOWNSTREAM INTO EAST CENTRAL NEB.

LEADING EDGE OF NORTH-SOUTH/80-MILE LONG QUASI-LINEAR MCS CONTINUES
TO SPREAD EAST-SOUTHEASTWARD AT AROUND 35 KT ACROSS CENTRAL NEB
NORTH OF I-80 AS OF 06Z...WITH ADDITIONAL/MORE RECENT DEVELOPMENT
ACROSS FAR SOUTHWEST NEB ATOP MCS-PERIPHERAL OUTFLOW. IN ASSOCIATION
WITH THE MCS...SUB-SEVERE GUSTS OF 38 KT/39 KT HAVE BEEN REPORTED
OVER THE PAST HOUR AT BROKEN BOW/NORTH PLATTE RESPECTIVELY. IN SPITE
OF MODEST VERTICAL SHEAR...AN INCREASING/EXPANDING COLD POOL AND AN
APPARENT MCV /EVIDENT WEST-NORTHWEST OF BROKEN BOW PER KLNX WSR-88D/
MAY SUSTAIN A SEVERE RISK OVER THE NEXT SEVERAL HOURS INTO EAST
CENTRAL NEB...WITH AN ISOLATED DAMAGING WIND THREAT POTENTIALLY
INCREASING.

..GUYER.. 07/25/2008

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

ATTN...WFO...OAX...GID...LBF...GLD...

42199973 42719885 42049739 40199829 40170168 40950057

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 24, 7:36 PM CDT	Mesoscale Discussion	SPC	Blaine, Box Butte, Brown, Cherry, Custer, Dawes and 12 more	54 min
Jul 24, 9:08 PM CDT	Mesoscale Discussion	SPC	Adams, Antelope, Arthur, Blaine, Boone, Box Butte and 49 more	67 min
Jul 24, 10:03 PM CDT	Severe Thunderstorm Watch	SPC	Arthur, Blaine, Boyd, Brown, Buffalo, Chase and 31 more	5 hr
Jul 25, 2:36 PM CDT	Mesoscale Discussion	SPC	Arthur, Banner, Box Butte, Chase, Cheyenne, Dawes and 10 more	2 hr
Jul 25, 3:54 PM CDT	Severe Thunderstorm Watch	SPC	Banner, Box Butte, Cheyenne, Dawes, Kimball, Morrill and 2 more	6 hr

Nearby

Mesoscale Discussions in Nebraska, 2008 Every mesoscale discussion in 2008

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.