Alert archive / Arkansas / Tornado Watches in 2007
Tornado Watch 43
The Storm Prediction Center issued this tornado watch at Mar 1, 2007, 6:17 AM CST for 28 counties in Arkansas; 26 parishes in Louisiana; 10 counties in Texas. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 1, 2007, 6:17 AM CST (12:17 UTC)
- Expired
- Mar 1, 2007, 12:58 PM CST
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 2.5 in
- Strongest gust expected
- 70 kt
All 64 counties
Arkansas County, AR, Ashley County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Clark County, AR, Cleveland County, AR, Columbia County, AR, Dallas County, AR, Desha County, AR, Drew County, AR, Garland County, AR, Grant County, AR, Hempstead County, AR, Hot Spring County, AR, Jefferson County, AR, Lafayette County, AR, Lincoln County, AR, Lonoke County, AR, Monroe County, AR, Montgomery County, AR, Nevada County, AR, Ouachita County, AR, Pike County, AR, Prairie County, AR, Pulaski County, AR, Saline County, AR, Union County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Claiborne Parish, LA, Concordia Parish, LA, De Soto Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Red River Parish, LA, Richland Parish, LA, Sabine Parish, LA, Tensas Parish, LA, Union Parish, LA, Webster Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Angelina County, TX, Cherokee County, TX, Harrison County, TX, Marion County, TX, Nacogdoches County, TX, Panola County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, Shelby County, TX
The radar
The Shreveport radar (KSHV), 128 km from the middle of the area, began a volume at 12:19 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
- 50%
- One or more EF2 to EF5 tornadoes
- 30%
- Ten or more severe wind reports
- 40%
- One or more gusts of 65 knots or more
- 30%
- Ten or more severe hail reports
- 40%
- One or more hailstones of 2 inches or more
- 40%
- Six or more combined severe hail and wind reports
- 80%
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 |
|---|---|---|---|---|
| Mar 1, 6:27 AM CST | Severe Thunderstorm Warning | SHV | Cherokee | 48 min |
| Mar 1, 6:38 AM CST | Severe Thunderstorm Warning | LZK | Saline | 37 min |
| Mar 1, 6:49 AM CST | Severe Thunderstorm Warning | SHV | Nacogdoches, Rusk | 56 min |
| Mar 1, 7:13 AM CST | Severe Thunderstorm Warning | SHV | Lafayette | 32 min |
| Mar 1, 7:38 AM CST | Severe Thunderstorm Warning | JAN | Morehouse, West Carroll | 84 min |
| Mar 1, 8:15 AM CST | Severe Thunderstorm Warning | LZK | Calhoun | 30 min |
| Mar 1, 9:24 AM CST | Severe Thunderstorm Warning | JAN | Catahoula, Concordia | 51 min |
| Mar 1, 9:26 AM CST | Severe Thunderstorm Warning | LZK | Desha, Lincoln | 34 min |
| Mar 1, 9:47 AM CST | Tornado Warning | JAN | Catahoula, Concordia | 58 min |
| Mar 1, 10:19 AM CST | Severe Thunderstorm Warning | JAN | Tensas | 32 min |
| Mar 1, 11:05 AM CST | Severe Thunderstorm Warning | JAN | Chicot | 35 min |
| Mar 1, 11:33 AM CST | Severe Thunderstorm Warning | JAN | Catahoula, Concordia | 57 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 (KSHV), launched 12:00Z, 0.3 hours before the alert went out and 121 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
- 962 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 644 m above ground
- 0-6 km bulk shear
- 73 kt
- 0-1 km storm-relative helicity
- 256 m²/s²
- 0-3 km storm-relative helicity
- 237 m²/s²
- Significant tornado parameter
- 1.6
- Supercell composite
- 6.6
The text
As transmitted, in the capitals the NWS used until 2016.
000
WWUS20 KWNS 011218
SEL3
SPC WW 011218
ARZ000-LAZ000-TXZ000-012000-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 43
NWS STORM PREDICTION CENTER NORMAN OK
615 AM CST THU MAR 1 2007
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
SOUTHERN ARKANSAS
NORTHERN LOUISIANA
NORTHEAST TEXAS
EFFECTIVE THIS THURSDAY MORNING AND AFTERNOON FROM 615 AM UNTIL
200 PM CST.
TORNADOES...HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 80 STATUTE
MILES EAST AND WEST OF A LINE FROM 45 MILES NORTH NORTHWEST OF
PINE BLUFF ARKANSAS TO 40 MILES SOUTHWEST OF NATCHITOCHES
LOUISIANA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).
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 40...WW 41...WW 42...
DISCUSSION...STRONG FRONTAL SYSTEM ASSOCIATED WITH DEEP CYCLONE
ACROSS THE PLAINS WILL MOVE EAST INTO MOIST AND UNSTABLE AIR MASS
OVER PARTS OF NERN TX...NRN LA...AND SRN AR THIS MORNING. CONVECTION
ALONG THE FRONT HAS BEEN INCREASING SLOWLY AND THIS TREND IS
EXPECTED TO CONTINUE AS LARGE SCALE FORCING STRENGTHENS ACROSS THE
REGION THROUGH THE MORNING. DEEP AND LOW LEVEL SHEAR PROFILES ARE
VERY SUPPORTIVE OF UPDRAFT ROTATION AND TORNADOES.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
450. MEAN STORM MOTION VECTOR 24045.
...CARBIN/HARTSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 1, 12:12 AM CST | Mesoscale Discussion | SPC | Arkansas, Ashley, Baxter, Bradley, Chicot, Clay and 36 more | 2 hr |
| Mar 1, 1:32 AM CST | Tornado Watch | SPC | Benton, Boone, Carroll, Crawford, Franklin, Johnson and 7 more | 6 hr |
| Mar 1, 3:35 AM CST | Mesoscale Discussion | SPC | Baxter, Clay, Cleburne, Conway, Craighead, Cross and 18 more | 55 min |
| Mar 1, 3:58 AM CST | Tornado Watch | SPC | Baxter, Clay, Cleburne, Conway, Craighead, Faulkner and 18 more | 8 hr |
| Mar 1, 5:23 AM CST | Mesoscale Discussion | SPC | Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 19 more | 97 min |
| Mar 1, 6:54 AM CST | Mesoscale Discussion | SPC | Crittenden, Cross, Lee, Phillips, St. Francis | 66 min |
| Mar 1, 7:28 AM CST | Tornado Watch | SPC | Crittenden, Cross, Lee, Mississippi, Phillips, St. Francis | 12 hr |
| Mar 1, 5:22 PM CST | Mesoscale Discussion | SPC | Saint Bernard | 83 min |
| Mar 1, 3:03 AM CST | Mesoscale Discussion | SPC | Bell, Blanco, Burnet, Coryell, Gillespie, Kerr and 6 more | 27 min |
Nearby
Tornado Watches in Arkansas, 2007Tornado Watches in Louisiana, 2007Tornado Watches in Texas, 2007Every tornado watch 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.