Alert archive / Texas / Mesoscale Discussions in 2003
Mesoscale Discussion 1069
The Storm Prediction Center issued this mesoscale discussion at May 19, 2003, 6:58 PM CDT for 16 counties in Oklahoma; 18 counties in Texas. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- May 19, 2003, 6:58 PM CDT (23:58 UTC)
- Expired
- May 19, 2003, 9:00 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 34 counties
Carter County, OK, Cleveland County, OK, Cotton County, OK, Garvin County, OK, Grady County, OK, Hughes County, OK, Jefferson County, OK, Lincoln County, OK, Love County, OK, McClain County, OK, Murray County, OK, Oklahoma County, OK, Pontotoc County, OK, Pottawatomie County, OK, Seminole County, OK, Stephens County, OK, Archer County, TX, Brown County, TX, Callahan County, TX, Clay County, TX, Coleman County, TX, Comanche County, TX, Eastland County, TX, Jack County, TX, Montague County, TX, Palo Pinto County, TX, Runnels County, TX, Shackelford County, TX, Stephens County, TX, Taylor County, TX, Throckmorton County, TX, Wichita County, TX, Wise County, TX, Young County, TX
The radar
The Altus AFB radar (KFDR), 100 km from the middle of the area, began a volume at 00:03 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 watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Fort Sill, OK (KFSI), launched 12:00Z, 12.0 hours before the alert went out and 125 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
- 196 J/kg
- Mixed-layer CIN
- -776 J/kg
- Mixed-layer LCL
- 1418 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 330 m²/s²
- 0-3 km storm-relative helicity
- 360 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
As transmitted, in the capitals the NWS used until 2016.
888 ACUS11 KWNS 192359 SWOMCD SPC MCD 192358 OKZ000-TXZ000-200200- MESOSCALE DISCUSSION 1069 NWS STORM PREDICTION CENTER NORMAN OK 0658 PM CDT MON MAY 19 2003 AREAS AFFECTED...CNTRL/SRN OK...NWRN TX CONCERNING...SEVERE THUNDERSTORM WATCH 415... VALID 192358Z - 200200Z ISOLATED SUPERCELLS HAVE DEVELOPED ACROSS NRN PORTIONS OF THE WW ALONG WIND SHIFT...ESPECIALLY OVER STEPHENS COUNTY. DESPITE VERY MOIST BOUNDARY LAYER AND SUPERCELL STRUCTURE...IT APPEARS THIS ACTIVITY IS ROOTED VERY NEAR OR SLIGHTLY NORTH OF WIND SHIFT AS WEAK WARM ADVECTION SEEMS TO BE REQUIRED TO INITIATE CONVECTION. LARGE HAIL IS LIKELY WITH THIS ACTIVITY. VERY DEEP BOUNDARY LAYER ACROSS TX SUGGESTS CONVECTIVE MODE IS SLIGHTLY DIFFERENT WITH VERY HIGH BASED ACTIVITY DUE TO EXTREME SFC HEATING. MUCH WEAKER SHEAR IS RESULTING IN MORE MULTICELL STRUCTURE WITH CONVECTIVE OUTFLOW STRONGLY INFLUENCING STORM PROPAGATION. RELATIVELY DRY SUB CLOUD LAYER FAVORS POTENTIAL FOR DAMAGING WINDS IN ADDITION TO LARGE HAIL. ..DARROW.. 05/19/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...TSA...FWD...OUN...SJT... 31780050 33489910 34979803 36139682 35169611 31459881
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 19, 2:44 PM CDT | Mesoscale Discussion | SPC | Caddo, Canadian, Cleveland, Comanche, Cotton, Garvin and 10 more | 91 min |
| May 19, 3:55 PM CDT | Mesoscale Discussion | SPC | Kay, Logan, Noble, Nowata, Osage, Pawnee and 2 more | 95 min |
| May 19, 4:05 PM CDT | Severe Thunderstorm Watch | SPC | Carter, Cleveland, Coal, Cotton, Garvin, Grady and 12 more | 6 hr |
Nearby
Mesoscale Discussions in Texas, 2003Mesoscale Discussions in Oklahoma, 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.