Alert archive / Oklahoma / Mesoscale Discussions in 2003
Mesoscale Discussion 548
The Storm Prediction Center issued this mesoscale discussion at Apr 23, 2003, 5:47 PM CDT for 22 counties in Oklahoma. It was in force for 88 min.
The area
The outline as issued.
The facts
- Issued
- Apr 23, 2003, 5:47 PM CDT (22:47 UTC)
- Expired
- Apr 23, 2003, 7:15 PM CDT
- In force
- 88 min
- Issued by
- the Storm Prediction Center
All 22 counties
Alfalfa County, OK, Beckham County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Comanche County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Garfield County, OK, Grady County, OK, Grant County, OK, Greer County, OK, Harmon County, OK, Harper County, OK, Kingfisher County, OK, Kiowa County, OK, Major County, OK, Roger Mills County, OK, Washita County, OK, Woods County, OK, Woodward County, OK
The radar
The Altus AFB radar (KFDR), 130 km from the middle of the area, began a volume at 22:50 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
Norman, OK (KOUN), launched 12:00Z, 10.8 hours before the alert went out and 170 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
- 1075 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 233 m²/s²
- 0-3 km storm-relative helicity
- 242 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
000 ACUS11 KWNS 232248 SWOMCD SPC MCD 232247 OKZ000-TXZ000-240015- MESOSCALE DISCUSSION 0548 NWS STORM PREDICTION CENTER NORMAN OK 0547 PM CDT WED APR 23 2003 AREAS AFFECTED...WESTERN/NORTHWESTERN OK CONCERNING...SEVERE THUNDERSTORM WATCH 147... VALID 232247Z - 240015Z SCATTERED SEVERE TSTM ACTIVITY CONTINUES TO AFFECT PORTIONS OF WW #147 IN WRN/NWRN OK. WW #147 WILL CONTINUE TO REMAIN IN EFFECT THRU EXPIRATION...ALTHOUGH LACK OF INSTABILITY SHOULD LIMIT THE OVERALL SEVERE THREAT. MOST RECENT SFC ANALYSIS SUGGESTS THE DRYLINE HAS SURGED TO JUST WEST OF AN ALVA-CLINTON LINE ACROSS MUCH OF WRN OK. SURFACE DEWPOINT / TEMPERATURE VALUES TO THE EAST OF THIS LINE ARE GENERALLY IN THE UPPER 50S/LOW 60S YIELDING MUCAPES GENERALLY BETWEEN 500-1000 J/KG IN THE REGION. EXPECT ISOLATED SEVERE ACTIVITY TO AFFECT PARTS OF THE WW THRU EXPIRATION. A WEDGE OF CLEARING IS NOTICEABLE ON VISIBLE IN THE MOIST AXIS JUST TO THE EAST OF AFOREMENTIONED DRYLINE ACTIVITY WHICH SHOULD ALLOW SOME ADDITIONAL DESTABILIZATION OVER THE NEXT HOUR. THIS COULD LEAD TO A TEMPORARY INCREASE IN THE INTENSITY OF SOME OF THIS ACTIVITY...WITH THE MAIN THREATS LARGE HAIL AND LOCALLY DAMAGING WINDS. HOWEVER...EXPECT AN OVERALL DOWNWARD TREND IN CONVECTIVE INTENSITY THRU THE 24/00Z EXPIRATION AS STORMS MOVE INTO CLOUDY / RAIN-COOLED AIRMASS IN PLACE ACROSS CENTRAL OK. ..NADEN.. 04/23/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...OUN...AMA... 34599976 34899998 36000020 36939980 36919749 34649773
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 23, 2:58 AM CDT | Mesoscale Discussion | SPC | Harmon | 2 hr |
| Apr 23, 9:55 AM CDT | Mesoscale Discussion | SPC | Alfalfa, Blaine, Caddo, Canadian, Cleveland, Creek and 17 more | 65 min |
| Apr 23, 10:30 AM CDT | Mesoscale Discussion | SPC | Beckham, Custer, Dewey, Ellis, Greer, Harmon and 4 more | 90 min |
| Apr 23, 11:50 AM CDT | Tornado Watch | SPC | Comanche, Cotton, Harmon, Jackson, Tillman | 6 hr |
| Apr 23, 1:20 PM CDT | Severe Thunderstorm Watch | SPC | Alfalfa, Beckham, Blaine, Caddo, Canadian, Custer and 15 more | 6 hr |
| Apr 23, 1:26 PM CDT | Mesoscale Discussion | SPC | Comanche, Cotton, Harmon, Jackson, Tillman | 94 min |
| Apr 23, 2:44 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Beckham, Blaine, Caddo, Canadian, Custer and 15 more | 91 min |
| Apr 23, 3:08 PM CDT | Mesoscale Discussion | SPC | Carter, Comanche, Cotton, Garvin, Jackson, Jefferson and 5 more | 97 min |
| Apr 23, 4:00 PM CDT | Tornado Watch | SPC | Atoka, Bryan, Carter, Jefferson, Johnston, Love and 3 more | 6 hr |
| Apr 23, 5:36 PM CDT | Mesoscale Discussion | SPC | Cotton, Tillman | 54 min |
| Apr 23, 6:00 PM CDT | Tornado Watch | SPC | Comanche, Cotton, Stephens, Tillman | 4 hr |
Nearby
Mesoscale 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.