Alert archive / Texas / Mesoscale Discussions in 2007
Mesoscale Discussion 1213
The Storm Prediction Center issued this mesoscale discussion at Jun 20, 2007, 10:21 AM CDT for 4 states. It was in force for 54 min.
The area
The outline as issued.
The facts
- Issued
- Jun 20, 2007, 10:21 AM CDT (15:21 UTC)
- Expired
- Jun 20, 2007, 11:15 AM CDT
- In force
- 54 min
- Issued by
- the Storm Prediction Center
All 102 counties
Clark County, AR, Columbia County, AR, Crawford County, AR, Franklin County, AR, Hempstead County, AR, Howard County, AR, Lafayette County, AR, Little River County, AR, Logan County, AR, Miller County, AR, Montgomery County, AR, Nevada County, AR, Pike County, AR, Polk County, AR, Scott County, AR, Sebastian County, AR, Sevier County, AR, Washington County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Red River Parish, LA, Sabine Parish, LA, Webster Parish, LA, Adair County, OK, Cherokee County, OK, Haskell County, OK, Latimer County, OK, LeFlore County, OK, McCurtain County, OK, McIntosh County, OK, Muskogee County, OK, Sequoyah County, OK, Wagoner County, OK, Anderson County, TX, Angelina County, TX, Atascosa County, TX, Austin County, TX, Bastrop County, TX, Bexar County, TX, Bowie County, TX, Brazos County, TX, Burleson County, TX, Caldwell County, TX, Camp County, TX, Cass County, TX, Cherokee County, TX, Colorado County, TX, Comal County, TX, DeWitt County, TX, Dimmit County, TX, Fayette County, TX, Franklin County, TX, Freestone County, TX, Frio County, TX, Goliad County, TX, Gonzales County, TX, Gregg County, TX, Grimes County, TX, Guadalupe County, TX, Harrison County, TX, Henderson County, TX, Houston County, TX, Karnes County, TX, Kinney County, TX, La Salle County, TX, Lavaca County, TX, Lee County, TX, Leon County, TX, Limestone County, TX, Madison County, TX, Marion County, TX, Maverick County, TX, McMullen County, TX, Medina County, TX, Milam County, TX, Montgomery County, TX, Morris County, TX, Nacogdoches County, TX, Panola County, TX, Polk County, TX, Red River County, TX, Robertson County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, San Jacinto County, TX, Shelby County, TX, Smith County, TX, Titus County, TX, Trinity County, TX, Tyler County, TX, Upshur County, TX, Uvalde County, TX, Walker County, TX, Waller County, TX, Washington County, TX, Wilson County, TX, Wood County, TX, Zavala County, TX
The radar
The Dallas/Ft Worth radar (KFWS), 90 km from the middle of the area, began a volume at 15:24 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
Fort Worth, TX (KFWD), launched 12:00Z, 3.4 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
- 2 J/kg
- Mixed-layer CIN
- -501 J/kg
- Mixed-layer LCL
- 1108 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- -96 m²/s²
- 0-3 km storm-relative helicity
- 4 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 201521 SWOMCD SPC MCD 201521 ARZ000-LAZ000-TXZ000-OKZ000-201615- MESOSCALE DISCUSSION 1213 NWS STORM PREDICTION CENTER NORMAN OK 1021 AM CDT WED JUN 20 2007 AREAS AFFECTED...SRN-ERN TX/NWRN LA/WRN AR/ERN OK CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY VALID 201521Z - 201615Z SURFACE HEATING ALONG SRN/ERN PERIPHERIES OF LARGE WANING SRN PLAINS CONVECTIVE COMPLEX...WHERE THE AIR MASS REMAINS VERY MOIST FROM SRN TO ERN TX INTO NWRN LA AND NWD TO WRN AR/ERN OK...IS SUPPORTING AN ARCED AXIS OF MODERATE INSTABILITY. TSTMS WILL CONTINUE TO DEVELOP ALONG OUTFLOW BOUNDARIES WITH THIS CONVECTIVE SYSTEM AND A WWD MOVING BOUNDARY ALONG THE MIDDLE TX COASTAL PLAINS. HOWEVER... OVERALL WEAK DEEP LAYER SHEAR AS OBSERVED BY AREA WSR-88D VADS/WIND PROFILERS SUGGESTS THE POTENTIAL FOR STORM ORGANIZATION SHOULD BE LIMITED DURING THE SHORT TERM /THROUGH THE REST OF THE MORNING/. THE GREATEST THREAT IS EXPECTED TO BE LOCALLY HEAVY RAINFALL RATES OF AT LEAST 2 INCHES PER HOUR /ESPECIALLY OVER SOUTH CENTRAL TX/...GIVEN HIGH PRECIPITABLE WATER VALUES /1.75-2.0 INCHES PER 12Z SOUNDINGS/ AND WEAK MEAN FLOW RESULTING IN SLOW STORM MOTIONS. ..PETERS.. 06/20/2007 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...LZK...LCH...SHV...TSA...HGX...FWD...CRP...EWX... 36229421 35419369 33129270 31489316 29529613 28639733 28309900 28340024 28730049 29300088 29570055 29739842 30429731 31629676 32799558 33979508 34849531 35799599 36319502
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 19, 7:26 PM CDT | Mesoscale Discussion | SPC | Assumption, Iberia, Jefferson, Lafayette, Lafourche, Plaquemines and 3 more | 64 min |
| Jun 19, 7:39 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Beaver, Beckham, Blaine, Caddo, Canadian and 39 more | 66 min |
| Jun 19, 9:28 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Beaver, Beckham, Blaine, Caddo, Canadian and 32 more | 62 min |
| Jun 19, 11:20 PM CDT | Severe Thunderstorm Watch | SPC | Atoka, Beckham, Bryan, Caddo, Carter, Cleveland and 22 more | 6 hr |
| Jun 20, 12:49 AM CDT | Mesoscale Discussion | SPC | Atoka, Bryan, Carter, Choctaw, Cotton, Garvin and 6 more | 56 min |
| Jun 20, 4:09 AM CDT | Mesoscale Discussion | SPC | Bryan, Choctaw, Love, Marshall | 96 min |
| Jun 20, 4:38 AM CDT | Severe Thunderstorm Watch | SPC | Choctaw | 6 hr |
| Jun 20, 1:10 AM CDT | Severe Thunderstorm Watch | SPC | Borden, Bosque, Brown, Callahan, Coke, Coleman and 47 more | 8 hr |
| Jun 20, 3:44 AM CDT | Mesoscale Discussion | SPC | Anderson, Bandera, Bastrop, Bell, Bexar, Blanco and 65 more | 91 min |
| Jun 20, 6:24 AM CDT | Mesoscale Discussion | SPC | Edwards, Kinney, Real, Sutton, Terrell, Val Verde | 66 min |
| Jun 20, 6:42 AM CDT | Mesoscale Discussion | SPC | Bastrop, Bell, Caldwell, Falls, Hays, Lee and 4 more | 93 min |
| Jun 20, 2:39 PM CDT | Mesoscale Discussion | SPC | El Paso, Hudspeth | 96 min |
Nearby
Mesoscale Discussions in Texas, 2007Mesoscale Discussions in Arkansas, 2007Mesoscale Discussions in Oklahoma, 2007Every mesoscale discussion in 2007
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.