Alert archive / Nebraska / Mesoscale Discussions in 2003
Mesoscale Discussion 2248
The Storm Prediction Center issued this mesoscale discussion at Aug 25, 2003, 3:44 PM CDT for 17 counties in Nebraska. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 25, 2003, 3:44 PM CDT (20:44 UTC)
- Expired
- Aug 25, 2003, 5:45 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
Counties Antelope County, NE, Boone County, NE, Custer County, NE, Dawson County, NE, Frontier County, NE, Garfield County, NE, Greeley County, NE, Hayes County, NE, Lincoln County, NE, Logan County, NE, Loup County, NE, Madison County, NE, Pierce County, NE, Stanton County, NE, Valley County, NE, Wayne County, NE, Wheeler County, NE
The radar
The North Platte radar (KLNX), 115 km from the middle of the area, began a volume at 20:45 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 12:00Z, 8.7 hours before the alert went out and 111 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
- 2502 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- -89 m²/s²
- 0-3 km storm-relative helicity
- 5 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
834 ACUS11 KWNS 252045 SWOMCD SPC MCD 252044 NEZ000-252245- MESOSCALE DISCUSSION 2248 NWS STORM PREDICTION CENTER NORMAN OK 0344 PM CDT MON AUG 25 2003 AREAS AFFECTED...CNTRL/NE NEB CONCERNING...SEVERE THUNDERSTORM POTENTIAL VALID 252044Z - 252245Z ISOLATED DOWNBURSTS...PERHAPS SOME HAIL...MAY ACCOMPANY STRONGEST CELLS THROUGH EARLY EVENING. HOWEVER...WW IS NOT CURRENTLY ANTICIPATED. LATEST VISIBLE IMAGERY INDICATES DEEPENING CONVECTIVE DEVELOPMENT ALONG WEAK SURFACE BOUNDARY ACROSS CENTRAL NEBRASKA. WIND SHIFT EXTENDS FROM AREAS SOUTHEAST OF IMPERIAL INTO THE VICINITY OF BROKEN BOW...EAST NORTHEASTWARD INTO AREAS NORTHWEST OF SIOUX CITY IA. STRONG HEATING TO AROUND 100F HAS CONTRIBUTED TO A DEEP MIXED BOUNDARY LAYER WITH CAPE IN EXCESS OF 1000 J/KG ALONG/JUST SOUTH OF BOUNDARY...SUPPORTIVE OF VIGOROUS UPDRAFTS. ACTIVITY MAY CONTINUE TO INCREASE/INTENSIFY LATE THIS AFTERNOON...AIDED BY WEAK LARGE-SCALE FORCING FOR UPWARD VERTICAL MOTION ASSOCIATED WITH APPROACHING SHORT WAVE TROUGH. LOW AMPLITUDE TROUGH IS EMBEDDED WITHIN WEAK SUBTROPICAL JET...AND PROGGED TO ONLY SLOWLY MIGRATE EASTWARD OUT OF THE NORTH CENTRAL HIGH PLAINS LATE THIS AFTERNOON AND EVENING. WHILE THERMODYNAMIC ENVIRONMENT IS SUPPORTIVE OF LARGE HAIL...THIS THREAT WILL BE MARGINALIZED BY WEAK ENVIRONMENTAL SHEAR. ISOLATED DAMAGING DOWNBURSTS APPEARS PRIMARY SEVERE THREAT...AS LARGE TEMPERATURE/ DEW POINT SPREADS IN THE SUB CLOUD LAYER ENHANCES EVAPORATIVE COOLING IN DOWNDRAFTS. ..KERR.. 08/25/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...FSD...OAX...GID...LBF...GLD... 41640040 42349910 42649751 42399670 41619739 41359883 40829947 40250050 40370143 41100112
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 25, 6:21 PM CDT | Mesoscale Discussion | SPC | Keya Paha | 54 min |
Nearby
Mesoscale Discussions in Nebraska, 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.