Alert archive / Oklahoma / Mesoscale Discussions in 2009
Mesoscale Discussion 1021
The Storm Prediction Center issued this mesoscale discussion at Jun 10, 2009, 10:44 AM CDT for 17 counties in Oklahoma; 7 counties in Texas. It was in force for 91 min.
The area
The outline as issued.
The facts
- Issued
- Jun 10, 2009, 10:44 AM CDT (15:44 UTC)
- Expired
- Jun 10, 2009, 12:15 PM CDT
- In force
- 91 min
- Issued by
- the Storm Prediction Center
All 24 counties
Beckham County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Comanche County, OK, Cotton County, OK, Custer County, OK, Dewey County, OK, Grady County, OK, Greer County, OK, Harmon County, OK, Jackson County, OK, Kiowa County, OK, Roger Mills County, OK, Stephens County, OK, Tillman County, OK, Washita County, OK, Collingsworth County, TX, Donley County, TX, Foard County, TX, Hardeman County, TX, Wheeler County, TX, Wichita County, TX, Wilbarger County, TX
The radar
The Altus AFB radar (KFDR), 70 km from the middle of the area, began a volume at 15:44 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, 3.7 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
- 528 J/kg
- Mixed-layer CIN
- -315 J/kg
- Mixed-layer LCL
- 1998 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 153 m²/s²
- 0-3 km storm-relative helicity
- 200 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
ACUS11 KWNS 101545
SWOMCD
SPC MCD 101544
OKZ000-TXZ000-101715-
MESOSCALE DISCUSSION 1021
NWS STORM PREDICTION CENTER NORMAN OK
1044 AM CDT WED JUN 10 2009
AREAS AFFECTED...PORTIONS OF NWRN TX AND THE ERN TX PNHDL INTO CNTRL
OK
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 101544Z - 101715Z
SEVERE STORM THREAT CURRENTLY OVER W TX IS EXPECTED TO SPREAD NEWD
ACROSS DISCUSSION AREA TODAY. CONVECTIVE TRENDS ARE BEING MONITORED
FOR A POSSIBLE WW ISSUANCE.
A CLUSTER OF ELEVATED TSTMS FROM PVW TO SW OF CDS AS OF 1530Z IS
MOVING/DEVELOPING NEWD AT 30-40 KT WITH EXTRAPOLATION TAKING IT N OF
WW 363 BETWEEN 1600-1630Z. THIS ACTIVITY IS LIKELY ASSOCIATED WITH
A LEAD SHORT WAVE TROUGH LIFTING NEWD THROUGH SWRN TX AND ERN NM
WHICH IS EVIDENT IN WATER VAPOR IMAGERY AND NOTED INCREASE IN
MIDLEVEL WIND FIELDS AT TUCUMCARI NM. COMPARISON OF 12Z ELP AND MAF
SOUNDING DATA INDICATE THAT CONSIDERABLE TROPOSPHERIC COOLING IS
ASSOCIATED WITH THIS IMPULSE WHICH SHOULD GRADUALLY ERODE STRONGER
CAP OBSERVED FROM FWD THROUGH OUN.
LATEST TRENDS IN SURFACE OBSERVATIONAL DATA INDICATE DEEPENING
SURFACE LOW ALONG COLD FRONT OVER W-CNTRL OK WHICH IS CONTRIBUTING
TO LOW-LEVEL MOISTENING ACROSS NWRN TX INTO SWRN OK. WHILE
INCREASING CLOUDINESS MAY TEND TO LIMIT DIABATIC HEATING...THIS
MOISTENING COUPLED WITH THE DYNAMIC COOLING ASSOCIATED WITH THE
MIDLEVEL IMPULSE SHOULD CONTINUE TO SUPPORT AIR MASS DESTABILIZATION
ACROSS AREA WITH MLCAPE OF 1500-3000 J/KG POSSIBLE BY AFTERNOON.
THIS INSTABILITY IN CONJUNCTION WITH THE STRENGTHENING WIND FIELDS
SHOULD MAINTAIN ONGOING TSTM COMPLEX WITH ACTIVITY BECOMING
PROGRESSIVELY SURFACE-BASED ALONG AND E/SE OF SURFACE BOUNDARY.
LARGE HAIL AND DAMAGING WIND GUSTS WILL BE THE PRIMARY THREATS WITH
THE MOST INTENSE STORMS.
..MEAD.. 06/10/2009
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...OUN...AMA...
LAT...LON 34830112 35590063 35989982 36129920 36089829 35769773
35379755 34709767 34159811 33759869 33649955 33819992
34799994 34830112SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 9, 9:15 PM CDT | Mesoscale Discussion | SPC | Craig, Delaware, Mayes, Ottawa | 60 min |
| Jun 9, 9:46 PM CDT | Severe Thunderstorm Watch | SPC | Delaware, Ottawa | 7 hr |
| Jun 9, 11:30 PM CDT | Mesoscale Discussion | SPC | Delaware | 60 min |
| Jun 10, 2:26 AM CDT | Mesoscale Discussion | SPC | Delaware, Ottawa | 64 min |
| Jun 10, 11:09 AM CDT | Severe Thunderstorm Watch | SPC | Alfalfa, Beckham, Blaine, Caddo, Canadian, Comanche and 20 more | 7 hr |
| Jun 10, 12:30 PM CDT | Mesoscale Discussion | SPC | Craig, Nowata, Ottawa, Washington | 90 min |
| Jun 10, 1:35 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Beckham, Blaine, Caddo, Canadian, Comanche and 15 more | 85 min |
| Jun 10, 2:13 PM CDT | Severe Thunderstorm Watch | SPC | Atoka, Bryan, Carter, Cleveland, Coal, Garvin and 10 more | 10 hr |
| Jun 10, 3:46 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Cherokee, Choctaw, Craig, Creek, Delaware and 19 more | 6 hr |
| Jun 10, 5:38 PM CDT | Mesoscale Discussion | SPC | Atoka, Bryan, Carter, Choctaw, Coal, Jefferson and 5 more | 67 min |
| Jun 10, 6:17 PM CDT | Mesoscale Discussion | SPC | McCurtain | 58 min |
| Jun 10, 6:37 PM CDT | Severe Thunderstorm Watch | SPC | McCurtain | 8 hr |
| Jun 10, 7:56 AM CDT | Mesoscale Discussion | SPC | Andrews, Borden, Cochran, Crane, Crosby, Dawson and 19 more | 64 min |
| Jun 10, 8:38 AM CDT | Severe Thunderstorm Watch | SPC | Andrews, Borden, Briscoe, Childress, Cochran, Cottle and 18 more | 6 hr |
| Jun 10, 11:46 AM CDT | Mesoscale Discussion | SPC | Andrews, Borden, Briscoe, Childress, Cochran, Cottle and 18 more | 89 min |
Nearby
Mesoscale Discussions in Oklahoma, 2009Mesoscale Discussions in Texas, 2009Every mesoscale discussion in 2009
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.