Alert archive / Nebraska / Mesoscale Discussions in 2003

Mesoscale Discussion 2510

November 17, 2003Mills County, Iowa; 10 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Nov 17, 2003, 5:42 PM CST for Mills County, Iowa; 10 counties in Nebraska. It was in force for 93 min.

The area

The outline as issued.

The facts

Issued
Nov 17, 2003, 5:42 PM CST (23:42 UTC)
Expired
Nov 17, 2003, 7:15 PM CST
In force
93 min
Issued by
the Storm Prediction Center

Counties Mills County, IA, Cass County, NE, Douglas County, NE, Gage County, NE, Jefferson County, NE, Johnson County, NE, Lancaster County, NE, Nemaha County, NE, Otoe County, NE, Pawnee County, NE, Sarpy County, NE

The radar

The Omaha radar (KOAX), 71 km from the middle of the area, began a volume at 23:43 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

Omaha, NE (KOAX), launched 12:00Z, 11.7 hours before the alert went out and 71 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, Omaha, NE at 12:00Z on 2003-11-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Omaha, NE at 12:00Z on 2003-11-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 389 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
620 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
389 m²/s²
0-3 km storm-relative helicity
389 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.

035 
ACUS11 KWNS 172343
SWOMCD
SPC MCD 172342 
IAZ000-MOZ000-NEZ000-KSZ000-180115-

MESOSCALE DISCUSSION 2510
NWS STORM PREDICTION CENTER NORMAN OK
0542 PM CST MON NOV 17 2003

AREAS AFFECTED...SERN NE

CONCERNING...TORNADO WATCH 951...

VALID 172342Z - 180115Z

SUPERCELL POTENTIAL REMAINS SIGNIFICANT OVER A LARGE PART OF
SOUTHEASTERN NEBRASKA AIDED IN PART BY STRONGLY BACKED LOW LEVEL
FLOW AS SHOWN ON KOAX VAD WIND PROFILE.  SURFACE LOW OVER NORTH
CENTRAL KANSAS MOVING INTO SOUTHWEST CORNER OF WATCH NEXT 1 TO 2
HOURS...WILL HELP CONCENTRATE LOW LEVEL CONVERGENCE OVER
SOUTHEASTERN NEBRASKA AND AID FURTHER STORM DEVELOPMENT.  AS STORMS
MOVE EAST OF OMA AND INTO COOLER AIRMASS..THREAT SHOULD BE PRIMARILY
LARGE HAIL.

..BOTHWELL.. 11/17/2003

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

ATTN...WFO...EAX...OAX...TOP...

40419706 40759690 41159667 41409634 41389569 41129544
40669566 40159590 39999692 40069723

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Nov 17, 6:42 AM CSTMesoscale DiscussionSPCAdair, Adams, Boone, Clarke, Dallas, Decatur and 14 more3 hr
Nov 17, 3:07 PM CSTMesoscale DiscussionSPCAdams, Audubon, Cass, Fremont, Harrison, Mills and 5 more113 min
Nov 17, 3:45 PM CSTTornado WatchSPCAdair, Adams, Cass, Fremont, Mills, Montgomery and 3 more5 hr

Nearby

Mesoscale Discussions in Nebraska, 2003Mesoscale Discussions in Iowa, 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.