Alert archive / Texas / Mesoscale Discussions in 2016
Mesoscale Discussion 415
The Storm Prediction Center issued this mesoscale discussion at Apr 18, 2016, 10:08 PM CDT for 6 counties in Texas. It was in force for 67 min.
The area
The outline as issued.
The facts
- Issued
- Apr 18, 2016, 10:08 PM CDT (03:08 UTC)
- Expired
- Apr 18, 2016, 11:15 PM CDT
- In force
- 67 min
- Issued by
- the Storm Prediction Center
Counties Cameron County, TX, Hidalgo County, TX, Jim Hogg County, TX, Starr County, TX, Willacy County, TX, Zapata County, TX
The radar
The Brownsville radar (KBRO), 115 km from the middle of the area, began a volume at 03:09 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
Brownsville Intl, TX (KBRO), launched 00:00Z, 3.1 hours before the alert went out and 118 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
- 1260 J/kg
- Mixed-layer CIN
- -10 J/kg
- Mixed-layer LCL
- 947 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 27 m²/s²
- 0-3 km storm-relative helicity
- 308 m²/s²
- Significant tornado parameter
- 0.6
- Supercell composite
- 4.3
The text
As transmitted.
380
ACUS11 KWNS 190308
SWOMCD
SPC MCD 190308
TXZ000-190415-
MESOSCALE DISCUSSION 0415
NWS STORM PREDICTION CENTER NORMAN OK
1008 PM CDT MON APR 18 2016
AREAS AFFECTED...PORTIONS DEEP S TX...LOWER RIO GRANDE VALLEY.
CONCERNING...SEVERE THUNDERSTORM WATCH 97...
VALID 190308Z - 190415Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 97
CONTINUES.
SUMMARY...REMAINDER WW MAY BE ALLOWED TO EXPIRE AS
SCHEDULED...EXCEPT WHERE CANCELED EARLY LOCALLY.
DISCUSSION...AGGREGATED COLD POOL FROM EARLIER CONVECTION FARTHER
N...REINFORCED BY PRIOR ACTIVITY OVER THIS REGION...HAS STABILIZED
LOW-LEVEL LAPSE RATES CONSIDERABLY. THIS CONTRIBUTES TO MLCINH
100-250 J/KG IN MODIFIED RAOBS AND FCST SOUNDINGS...OVER MUCH OF
AREA N OF RIO GRANDE. ELEVATED WAA MAY CONTINUE TO SUPPORT WIDELY
SCATTERED TSTMS N OF OUTFLOW BOUNDARY THAT HAS SURGED WELL SWWD INTO
MEX...AND ISOLATED/BRIEF HAIL NEAR SVR LIMITS CANNOT BE RULED OUT
DEFINITIVELY INVOF RIO GRANDE...ESPECIALLY NW MFE WHERE POCKETS OF
FAVORABLE MIDLEVEL LAPSE RATES MAY LINGER ABOVE COLD POOL.
HOWEVER...PRIND ORGANIZED SVR THREAT HAS WANED SUFFICIENTLY THAT WW
IS NO LONGER NEEDED PAST NOMINAL 04Z EXPIRATION.
..EDWARDS.. 04/19/2016
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...CRP...BRO...
LAT...LON 25949710 25939732 25839735 25859753 26019763 26049778
26069798 26059814 26229846 26229864 26369878 26419909
26509910 26869928 26919938 26989937 27039944 27229943
27329951 27569943 27459926 26989862 26759856 26549833
26549784 26659746 26589726 26279717 25949710SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 19, 12:48 PM CDT | Mesoscale Discussion | SPC | Baylor, Briscoe, Childress, Cottle, Crosby, Dickens and 14 more | 2 hr |
| Apr 19, 1:15 PM CDT | Mesoscale Discussion | SPC | Andrews, Borden, Crane, Crockett, Dawson, Ector and 13 more | 3 hr |
| Apr 19, 3:48 PM CDT | Mesoscale Discussion | SPC | Archer, Baylor, Clay, Cottle, Dickens, Foard and 7 more | 2 hr |
| Apr 19, 6:11 PM CDT | Mesoscale Discussion | SPC | Callahan, Coke, Coleman, Concho, Crane, Crockett and 17 more | 94 min |
| Apr 19, 6:32 PM CDT | Mesoscale Discussion | SPC | Archer, Baylor, Clay, Cooke, Denton, Dickens and 23 more | 2 hr |
Nearby
Mesoscale Discussions in Texas, 2016Every mesoscale discussion in 2016
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.