Alert archive / Texas / Tornado Watches in 2015
Tornado Watch 103
The Storm Prediction Center issued this tornado watch at Apr 24, 2015, 4:45 PM CDT for 4 counties in Arkansas; 13 parishes in Louisiana; 26 counties in Texas. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 24, 2015, 4:45 PM CDT (21:45 UTC)
- Expired
- Apr 24, 2015, 10:00 PM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2 in
- Strongest gust expected
- 60 kt
All 43 counties
Columbia County, AR, Lafayette County, AR, Miller County, AR, Union County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Jackson Parish, LA, Lincoln Parish, LA, Natchitoches Parish, LA, Red River Parish, LA, Sabine Parish, LA, Union Parish, LA, Webster Parish, LA, Winn Parish, LA, Angelina County, TX, Bowie County, TX, Camp County, TX, Cass County, TX, Cherokee County, TX, Franklin County, TX, Gregg County, TX, Harrison County, TX, Houston County, TX, Madison County, TX, Marion County, TX, Morris County, TX, Nacogdoches County, TX, Panola County, TX, Polk 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, Upshur County, TX, Walker County, TX, Wood County, TX
The radar
The Shreveport radar (KSHV), 46 km from the middle of the area, began a volume at 21:46 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.
What SPC expected
The probabilities SPC published with the watch, for the watch area over its life.
- Two or more tornadoes
- 70%
- One or more EF2 to EF5 tornadoes
- 50%
- Ten or more severe wind reports
- 50%
- One or more gusts of 65 knots or more
- 20%
- Ten or more severe hail reports
- 60%
- One or more hailstones of 2 inches or more
- 40%
- Six or more combined severe hail and wind reports
- 95%
Warnings issued inside it
12 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 24, 5:03 PM CDT | Severe Thunderstorm Warning | HGX | Houston, Madison | 27 min |
| Apr 24, 5:15 PM CDT | Tornado Warning | HGX | Houston, Madison, Trinity, Walker | 30 min |
| Apr 24, 7:55 PM CDT | Severe Thunderstorm Warning | SHV | Hempstead, Lafayette, Little River, Miller, Nevada | 50 min |
| Apr 24, 7:59 PM CDT | Severe Thunderstorm Warning | SHV | Camp, Franklin, Smith, Titus, Wood | 46 min |
| Apr 24, 8:40 PM CDT | Severe Thunderstorm Warning | SHV | Camp, Gregg, Morris, Smith, Titus, Upshur and 1 more | 50 min |
| Apr 24, 8:52 PM CDT | Tornado Warning | SHV | Upshur | 23 min |
| Apr 24, 9:07 PM CDT | Severe Thunderstorm Warning | SHV | Miller | 38 min |
| Apr 24, 9:14 PM CDT | Severe Thunderstorm Warning | SHV | Cherokee, Gregg, Harrison, Marion, Nacogdoches, Panola and 3 more | 46 min |
| Apr 24, 9:20 PM CDT | Flash Flood Warning | SHV | Columbia, Hempstead, Lafayette, Little River, Miller, Nevada and 1 more | 3 hr |
| Apr 24, 9:21 PM CDT | Tornado Warning | SHV | Cass | 24 min |
| Apr 24, 9:44 PM CDT | Severe Thunderstorm Warning | SHV | Lafayette, Miller | 46 min |
| Apr 24, 9:57 PM CDT | Severe Thunderstorm Warning | SHV | Bossier, Caddo, De Soto | 48 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Shreveport, LA (KBAD), launched 12:00Z, 9.8 hours before the alert went out and 55 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
- 78 J/kg
- Mixed-layer CIN
- -248 J/kg
- Mixed-layer LCL
- 612 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 179 m²/s²
- 0-3 km storm-relative helicity
- 160 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.4
The text
As transmitted, in the capitals the NWS used until 2016.
438
WWUS20 KWNS 242142
SEL3
SPC WW 242142
ARZ000-LAZ000-TXZ000-250300-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 103
NWS STORM PREDICTION CENTER NORMAN OK
445 PM CDT FRI APR 24 2015
THE NWS STORM PREDICTION CENTER HAS ISSUED A
* TORNADO WATCH FOR PORTIONS OF
EXTREME SOUTHWEST ARKANSAS
NORTHWEST LOUISIANA
EAST CENTRAL AND NORTHEAST TEXAS
* EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 445 PM UNTIL
1000 PM CDT.
* PRIMARY THREATS INCLUDE...
A FEW TORNADOES LIKELY
SCATTERED LARGE HAIL LIKELY WITH ISOLATED VERY LARGE HAIL EVENTS
TO 2 INCHES IN DIAMETER POSSIBLE
SCATTERED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE
SUMMARY...SCATTERED STORMS DEVELOPING IN THE WARM SECTOR ACROSS E TX
AND NW LA WILL POTENTIALLY BECOME SUPERCELLS WITH THE RISK FOR
TORNADOES...LARGE HAIL...AND DAMAGING WINDS THROUGH THIS EVENING.
OTHER SEVERE STORMS WILL LIKELY MOVE EWD FROM N CENTRAL INTO NE TX
LATER THIS EVENING...WITH A TORNADO RISK AS WELL. A STRONG TORNADO
OR TWO WILL BE POSSIBLE...ESPECIALLY WITH STORMS MOVING ALONG THE
STALLED FRONT CLOSE TO I-20 THIS EVENING.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE
MILES EAST AND WEST OF A LINE FROM 25 MILES WEST NORTHWEST OF EL
DORADO ARKANSAS TO 10 MILES SOUTHEAST OF HUNTSVILLE TEXAS. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU3).
PRECAUTIONARY/PREPAREDNESS ACTIONS...
REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS.
&&
OTHER WATCH INFORMATION...CONTINUE...WW 99...WW 100...WW 101...WW
102...
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 25035.
...THOMPSONSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 24, 3:58 PM CDT | Mesoscale Discussion | SPC | Columbia, Lafayette, Miller, Union | 92 min |
| Apr 24, 10:29 AM CDT | Mesoscale Discussion | SPC | Allen, Beauregard, Calcasieu, Jefferson Davis | 91 min |
| Apr 24, 11:53 AM CDT | Mesoscale Discussion | SPC | Acadia, Allen, Assumption, Beauregard, Calcasieu, Cameron and 7 more | 97 min |
| Apr 24, 12:18 PM CDT | Tornado Watch | SPC | Acadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 10 more | 5 hr |
| Apr 24, 1:58 PM CDT | Mesoscale Discussion | SPC | Acadia, Ascension, Assumption, Cameron, East Baton Rouge, Iberia and 15 more | 92 min |
| Apr 24, 3:15 PM CDT | Tornado Watch | SPC | Ascension, Assumption, Iberville, Jefferson, Lafourche, Orleans and 6 more | 5 hr |
| Apr 23, 9:34 PM CDT | Mesoscale Discussion | SPC | Bandera, Dimmit, Edwards, Frio, Jim Hogg, Kinney and 10 more | 56 min |
| Apr 24, 2:36 AM CDT | Mesoscale Discussion | SPC | Dimmit, La Salle, McMullen, Webb, Zavala | 84 min |
| Apr 24, 3:01 AM CDT | Severe Thunderstorm Watch | SPC | Atascosa, Dimmit, Frio, La Salle, Live Oak, McMullen and 5 more | 4 hr |
| Apr 24, 5:41 AM CDT | Mesoscale Discussion | SPC | Atascosa, Bandera, Dimmit, Duval, Edwards, Frio and 10 more | 94 min |
| Apr 24, 11:12 AM CDT | Mesoscale Discussion | SPC | Bosque, Brown, Callahan, Coke, Coleman, Collin and 43 more | 2 hr |
| Apr 24, 12:56 PM CDT | Mesoscale Discussion | SPC | Childress, Collingsworth, Cottle, Crosby, Dickens, Foard and 3 more | 94 min |
| Apr 24, 2:10 PM CDT | Tornado Watch | SPC | Anderson, Bell, Bosque, Brown, Callahan, Coke and 52 more | 8 hr |
| Apr 24, 4:56 PM CDT | Mesoscale Discussion | SPC | Atascosa, Dimmit, Duval, Frio, Jim Hogg, Kinney and 9 more | 94 min |
| Apr 24, 6:01 PM CDT | Mesoscale Discussion | SPC | Dallas, Ellis, Erath, Hood, Johnson, Kaufman and 3 more | 59 min |
| Apr 24, 6:53 PM CDT | Severe Thunderstorm Watch | SPC | Atascosa, Bee, Brooks, Cameron, DeWitt, Dimmit and 19 more | 6 hr |
Nearby
Tornado Watches in Texas, 2015Tornado Watches in Louisiana, 2015Tornado Watches in Arkansas, 2015Every tornado watch in 2015
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.