Alert archive / Oklahoma / Mesoscale Discussions in 2004
Mesoscale Discussion 424
The Storm Prediction Center issued this mesoscale discussion at Apr 21, 2004, 10:26 PM CDT for 13 counties in Oklahoma. It was in force for 64 min.
The area
The outline as issued.
The facts
- Issued
- Apr 21, 2004, 10:26 PM CDT (03:26 UTC)
- Expired
- Apr 21, 2004, 11:30 PM CDT
- In force
- 64 min
- Issued by
- the Storm Prediction Center
Counties Atoka County, OK, Bryan County, OK, Choctaw County, OK, Coal County, OK, Haskell County, OK, Hughes County, OK, Johnston County, OK, Latimer County, OK, LeFlore County, OK, McCurtain County, OK, Pittsburg County, OK, Pushmataha County, OK, Seminole County, OK
The radar
The Western Arkansas radar (KSRX), 158 km from the middle of the area, began a volume at 03:26 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 00:00Z, 3.4 hours before the alert went out and 168 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
- 415 J/kg
- Mixed-layer CIN
- -82 J/kg
- Mixed-layer LCL
- 1340 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 120 m²/s²
- 0-3 km storm-relative helicity
- 357 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 11.0
The text
As transmitted, in the capitals the NWS used until 2016.
098 ACUS11 KWNS 220326 SWOMCD SPC MCD 220326 OKZ000-TXZ000-220430- MESOSCALE DISCUSSION 0424 NWS STORM PREDICTION CENTER NORMAN OK 1026 PM CDT WED APR 21 2004 AREAS AFFECTED...SERN OK CONCERNING...TORNADO WATCH 101... VALID 220326Z - 220430Z TORNADO THREAT CONTINUES WITHIN WW...THOUGH 3/4-2 INCH DIAMETER HAIL APPEARS TO BE THE MAIN THREAT. MOST STORMS ARE IN NRN PORTION OF WW AND THE WATCH MAY BE CANCELLED EARLY IF THESE STORMS SHIFT NWD OUT OF THE AREA. THE AIR MASS ACROSS SERN OK REMAINS MODERATELY UNSTABLE AND DEEP LAYER SHEAR AROUND 55 KT. THE NUMBER OF STORMS HAS DECREASED DURING THE PAST HOUR...BUT THE STORMS THAT REMAIN ARE SEVERE WITH HAIL LIKELY. LOCAL VAD WIND PROFILES SHOW STRONG TURNING...SUPPORTIVE OF TORNADOES...THOUGH THERE MAY BE SUFFICIENT DECOUPLING OF THE BOUNDARY LAYER THAT MIGHT INHIBIT TORNADOGENESIS. ..IMY.. 04/22/2004 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...SHV...TSA...FWD...OUN... 33919669 35369660 35289446 33969453
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 21, 7:06 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Beaver, Blaine, Dewey, Ellis, Harper and 3 more | 2 hr |
| Apr 21, 7:51 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Blaine, Choctaw, Cleveland, Creek, Delaware and 18 more | 84 min |
| Apr 21, 8:35 PM CDT | Severe Thunderstorm Watch | SPC | Alfalfa, Blaine, Dewey, Ellis, Garfield, Grant and 9 more | 5 hr |
| Apr 21, 8:35 PM CDT | Tornado Watch | SPC | Atoka, Bryan, Choctaw, Coal, Haskell, Hughes and 6 more | 5 hr |
| Apr 21, 10:10 PM CDT | Mesoscale Discussion | SPC | Adair, Cherokee, Craig, Creek, Delaware, Mayes and 8 more | 95 min |
| Apr 21, 10:50 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Cherokee, Craig, Creek, Delaware, Haskell and 14 more | 5 hr |
| Apr 21, 10:56 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Garfield, Grant, Kay, Kingfisher, Logan and 2 more | 94 min |
| Apr 22, 1:43 AM CDT | Mesoscale Discussion | SPC | Adair, Cherokee, Haskell, McIntosh, Mayes, Muskogee and 7 more | 92 min |
| Apr 22, 12:32 PM CDT | Mesoscale Discussion | SPC | Adair, Atoka, Cherokee, Coal, Delaware, Haskell and 15 more | 88 min |
| Apr 22, 1:40 PM CDT | Tornado Watch | SPC | Adair, Atoka, Bryan, Carter, Cherokee, Choctaw and 33 more | 6 hr |
| Apr 22, 3:26 PM CDT | Mesoscale Discussion | SPC | Adair, Atoka, Cherokee, Coal, Haskell, Hughes and 16 more | 64 min |
| Apr 22, 4:30 PM CDT | Tornado Watch | SPC | Bryan, Love | 6 hr |
| Apr 22, 5:27 PM CDT | Mesoscale Discussion | SPC | Adair, Atoka, Bryan, Choctaw, Coal, Craig and 23 more | 63 min |
| Apr 22, 6:23 PM CDT | Mesoscale Discussion | SPC | Adair, Carter, Garvin, Hughes, LeFlore, McCurtain and 10 more | 67 min |
Nearby
Mesoscale Discussions in Oklahoma, 2004Every mesoscale discussion in 2004
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.