Alert archive / Nebraska / Mesoscale Discussions in 2003
Mesoscale Discussion 183
The Storm Prediction Center issued this mesoscale discussion at Mar 3, 2003, 6:45 PM CST for 11 counties in Nebraska; 10 counties in South Dakota. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 3, 2003, 6:45 PM CST (00:45 UTC)
- Expired
- Mar 3, 2003, 11:45 PM CST
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
All 21 counties
Antelope County, NE, Boyd County, NE, Cedar County, NE, Cherry County, NE, Dawes County, NE, Dixon County, NE, Holt County, NE, Knox County, NE, Pierce County, NE, Sheridan County, NE, Sioux County, NE, Bennett County, SD, Bon Homme County, SD, Charles Mix County, SD, Clay County, SD, Custer County, SD, Fall River County, SD, Gregory County, SD, Oglala Lakota County, SD, Todd County, SD, Yankton County, SD
The radar
The North Platte radar (KLNX), 111 km from the middle of the area, began a volume at 00:45 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, 0.8 hours before the alert went out and 202 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1995 m above ground
- 0-6 km bulk shear
- 71 kt
- 0-1 km storm-relative helicity
- 4 m²/s²
- 0-3 km storm-relative helicity
- 141 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
404 ACUS11 KWNS 040045 SWOMCD SPC MCD 040045 SDZ000-NEZ000-040545- MESOSCALE DISCUSSION 0183 NWS STORM PREDICTION CENTER NORMAN OK 0645 PM CST MON MAR 03 2003 AREAS AFFECTED...SRN SD AND NRN NEB CONCERNING...HEAVY SNOW VALID 040045Z - 040545Z A NARROW AXIS OF HEAVY SNOW WILL DEVELOP ACROSS THE NWRN NEB PANHANDLE/BLACK HILLS REGION BETWEEN 03-06Z AND SPREAD RAPIDLY EWD ALONG THE SD/NEB BORDER OVERNIGHT. SNOWFALL RATES AROUND 1/HR ARE EXPECTED LOCALLY FOR A PERIOD OF 1-3 HOURS ACROSS THE DISCUSSION AREA. A STRONG E-W BAND OF UVV WILL DEVELOP ALONG THE SWRN SD/NWRN NEB BORDER BETWEEN 04/03-06Z AND SPREAD EWD TO FAR SERN SD AND FAR NERN NEB BY 04/12Z. STRONG DEFORMATION/FRONTOGENETIC FORCING WILL DEVELOP WITHIN CONFLUENT 700MB FLOW PATTERN AND STRONG BAROCLINIC ZONE ACROSS THE DISCUSSION AREA...DOWNSTREAM FROM THE POSITIVE TILT TROUGH ACROSS THE NRN ROCKIES. IR SATELLITE IMAGERY AT 0015Z INDICATES COOLING CLOUD TOPS ACROSS CENTRAL WY ASSOCIATED WITH THIS FORCING...WHICH WILL SPREAD INTO THE HIGH PLAINS BETWEEN 03-06Z. ETA MODEL SOUNDINGS ALONG SD/NEB BORDER TONIGHT INDICATE 700-500MB LAPSE RATES AROUND 7C/KM AND STRONG UVV WITHIN DENDRITE GROWTH ZONE /-12 TO -16C/ EXTENDING FROM 750-600MB. CONDITIONS APPEAR SUFFICIENT FOR A NARROW E-W BAND OF HEAVY SNOW PROPAGATING EWD ALONG THE NEB/SD BORDER DURING THE OVERNIGHT PERIOD. SNOW RATES AROUND 1/HR LASTING LOCALLY FOR A PERIOD OF 1-3 HOURS APPEAR LIKELY BEFORE VERY DRY BOUNDARY LAYER AIR ADVECTS MOVES INTO THE REGION FROM THE NORTH. ..BANACOS.. 03/04/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... 43560023 42860005 42090031 42070170 42270362 42670391 44170388 43880265 43360191 43269691 42339684 42099873
Nearby
Mesoscale Discussions in Nebraska, 2003Mesoscale Discussions in South Dakota, 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.