Alert archive / Texas / Mesoscale Discussions in 2019
Mesoscale Discussion 678
The Storm Prediction Center issued this mesoscale discussion at May 18, 2019, 7:13 PM CDT for 25 counties in Texas. It was in force for 62 min.
The area
The outline as issued.
The facts
- Issued
- May 18, 2019, 7:13 PM CDT (00:13 UTC)
- Expired
- May 18, 2019, 8:15 PM CDT
- In force
- 62 min
- Issued by
- the Storm Prediction Center
All 25 counties
Anderson County, TX, Bastrop County, TX, Bell County, TX, Brazos County, TX, Burleson County, TX, Cherokee County, TX, Falls County, TX, Fayette County, TX, Freestone County, TX, Grimes County, TX, Houston County, TX, Lee County, TX, Leon County, TX, Limestone County, TX, Madison County, TX, Milam County, TX, Montgomery County, TX, Polk County, TX, Robertson County, TX, San Jacinto County, TX, Travis County, TX, Trinity County, TX, Walker County, TX, Washington County, TX, Williamson County, TX
The radar
The Ft Hood radar (KGRK), 80 km from the middle of the area, began a volume at 00:17 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
Shreveport, LA (KBAD), launched 00:00Z, 0.2 hours before the alert went out and 325 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
- 1844 J/kg
- Mixed-layer CIN
- -15 J/kg
- Mixed-layer LCL
- 1157 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 132 m²/s²
- 0-3 km storm-relative helicity
- 197 m²/s²
- Significant tornado parameter
- 1.5
- Supercell composite
- 10.6
The text
As transmitted.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 18, 7:08 PM CDT | Tornado Watch | SPC | Angelina, Cherokee, Gregg, Harrison, Marion, Nacogdoches and 6 more | 7 hr |
| May 18, 10:16 PM CDT | Tornado Watch | SPC | Hardin, Houston, Jasper, Madison, Newton, Polk and 4 more | 6 hr |
| May 18, 11:53 PM CDT | Mesoscale Discussion | SPC | Angelina, Houston, Jasper, Madison, Nacogdoches, Newton and 9 more | 97 min |
| May 19, 1:02 AM CDT | Mesoscale Discussion | SPC | Newton | 58 min |
| May 19, 4:43 AM CDT | Mesoscale Discussion | SPC | Kinney, Maverick, Uvalde, Zavala | 3 hr |
| May 19, 3:49 PM CDT | Mesoscale Discussion | SPC | Hardin, Jasper, Newton, Orange, Sabine, San Augustine and 2 more | 86 min |
Nearby
Mesoscale Discussions in Texas, 2019Every mesoscale discussion in 2019
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.