Alert archive / Louisiana / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 10, NWS Shreveport, LA

January 2, 20175 parishes in Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at Jan 2, 2017, 10:53 AM CST for 5 parishes in Louisiana. It was in force for 52 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jan 2, 2017, 10:53 AM CST (16:53 UTC)
Expired: Jan 2, 2017, 11:45 AM CST
In force: 52 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Caldwell Parish, LA, Grant Parish, LA, LaSalle Parish, LA, Natchitoches Parish, LA, Winn Parish, LA

The radar

The Ft Polk radar (KPOE), 52 km from the middle of the area, began a volume at 16:58 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 was reported inside it

Time	Report	Where	Remark
Jan 2, 10:54 AM CST	TSTM WND DMG	3 N Colfax, LA	TREES DOWN ON HWY 8.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched one storm report to this severe thunderstorm warning; the first came 1 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jan 2, 6:12 AM CST	Tornado Watch	SPC	10 hr

The nearest sounding before it

Shreveport, LA (KBAD), launched 12:00Z, 4.9 hours before the alert went out and 147 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 0 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 240 m²/s²
0-3 km storm-relative helicity: 246 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.6

Open this sounding in Storm Lab

The text

As transmitted.

193 
WUUS54 KSHV 021653
SVRSHV
LAC021-043-059-069-127-021745-
/O.NEW.KSHV.SV.W.0010.170102T1653Z-170102T1745Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Shreveport LA
1053 AM CST MON JAN 2 2017

The National Weather Service in Shreveport has issued a

* Severe Thunderstorm Warning for...
  Grant Parish in north central Louisiana...
  Southwestern Caldwell Parish in north central Louisiana...
  Southeastern Natchitoches Parish in northwestern Louisiana...
  Northwestern La Salle Parish in north central Louisiana...
  Winn Parish in north central Louisiana...

* Until 1145 AM CST

* At 1052 AM CST, severe thunderstorms were located along a line
  extending from 8 miles northeast of Campti to near Montgomery to
  near Clifton, moving east at 50 mph.

  HAZARD...60 mph wind gusts and penny size hail. 

  SOURCE...Radar indicated. 

  IMPACT...Expect damage to roofs, siding, and trees. 

* Locations impacted include...
  Winnfield, Colfax, Urania, Pollock, Dry Prong, Tullos, Georgetown,
  Calvin, Atlanta, Sikes, Hudson, Bentley, Rochelle, Joyce, Zenoria,
  Lake Iatt, Aloha, Fishville and Williana.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

A tornado watch remains in effect until 200 PM CST for north central
and northwestern Louisiana.

LAT...LON 3139 9266 3141 9267 3140 9268 3140 9270
      3142 9268 3143 9269 3145 9268 3145 9271
      3147 9271 3147 9269 3152 9272 3148 9276
      3144 9283 3168 9285 3188 9295 3213 9241
      3186 9226 3147 9223
TIME...MOT...LOC 1652Z 248DEG 44KT 3198 9302 3168 9286 3132 9283 

HAIL...0.75IN
WIND...60MPH
 
$$

ITO

1 follow-up statement

493 
WWUS54 KSHV 021729
SVSSHV

Severe Weather Statement
National Weather Service Shreveport LA
1129 AM CST MON JAN 2 2017

LAC069-021739-
/O.CAN.KSHV.SV.W.0010.000000T0000Z-170102T1745Z/
Natchitoches LA-
1129 AM CST MON JAN 2 2017

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN NATCHITOCHES
PARISH IS CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A tornado watch remains in effect until 200 PM CST for north central
Louisiana.

LAT...LON 3177 9251 3202 9264 3213 9241 3186 9226
      3147 9223 3143 9245
TIME...MOT...LOC 1729Z 248DEG 44KT 3214 9257 3183 9241 3147 9238 

$$

LAC021-043-059-127-021745-
/O.CON.KSHV.SV.W.0010.000000T0000Z-170102T1745Z/
Grant LA-Caldwell LA-La Salle LA-Winn LA-
1129 AM CST MON JAN 2 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1145 AM CST
FOR EASTERN GRANT...SOUTHWESTERN CALDWELL...NORTHWESTERN LA SALLE AND
EASTERN WINN PARISHES...

At 1129 AM CST, severe thunderstorms were located along a line
extending from 10 miles southeast of Jonesboro to 11 miles southwest
of Olla to near Ball, moving east at 50 mph.

HAZARD...60 mph wind gusts and penny size hail. 

SOURCE...Radar indicated. 

IMPACT...Expect damage to roofs, siding, and trees. 

Locations impacted include...
Urania, Pollock, Tullos, Georgetown, Sikes, Zenoria, Hudson,
Fishville and Rochelle.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

A tornado watch remains in effect until 200 PM CST for north central
Louisiana.

LAT...LON 3177 9251 3202 9264 3213 9241 3186 9226
      3147 9223 3143 9245
TIME...MOT...LOC 1729Z 248DEG 44KT 3214 9257 3183 9241 3147 9238 

HAIL...0.75IN
WIND...60MPH
 
$$

ITO

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Shreveport, LA wrote its last area forecast discussion before this severe thunderstorm warning went out at Jan 2, 10:50 AM CST, 3 minutes earlier.

Area forecast discussion, Jan 2, 10:50 AM CST, 3 minutes before

Area Forecast Discussion
National Weather Service Shreveport LA
1050 AM CST Mon Jan 2 2017

.DISCUSSION...
Have updated to remove more counties from tornado watch number 2
which included all of the Texas counties and Miller county in S AR
and Caddo and Bossier in NW LA. have also made adjustments to the
rain chances in wake of the stronger band of thunderstorms and
rainfall amounts/QPF. /06/

&&

PREV DISCUSSION... /issued 552 AM CST Mon Jan 2 2017/

AVIATION...
Low cigs/vsbys will continue to affect area terminals through this
afternoon, as tstms increase in coverage ahead of an upper level
disturbance. Gusty winds, possibly in excess of 40 to 50 kts under
stronger storms, will be possible in the vc of any convection.
Tstms will come to an end from w to e by this evening, and
conditions should rapidly improve into the VFR thereafter.
Otherwise, expect ely winds 5-10 kts to become w to swly later
today. /12/

&&

.PRELIMINARY POINT TEMPS/POPS...
SHV  72  50  73  44 / 100  10   0  10
MLU  73  52  75  46 / 100  10   0  10
DEQ  67  42  67  35 /  80  10  10  10
TXK  68  48  69  39 / 100  10   0  10
ELD  69  47  71  42 / 100  10   0  10
TYR  73  48  71  38 /  10  10   0  10
GGG  75  48  72  40 /  50  10   0  10
LFK  75  48  75  44 / 100  10   0  10

&&

.SHV WATCHES/WARNINGS/ADVISORIES...
AR...None.
LA...None.
OK...None.
TX...None.
&&

06/12

Hazardous weather outlook, Jan 2, 3:21 AM CST, 7 hours 32 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SHREVEPORT LA
321 AM CST MON JAN 2 2017

ARZ050-051-059-OKZ077-TXZ096-021800-
SEVIER-HOWARD-LITTLE RIVER-MCCURTAIN-RED RIVER-
321 AM CST MON JAN 2 2017

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHWEST
ARKANSAS...SOUTHEAST OKLAHOMA AND NORTHEAST TEXAS.

.DAY ONE...TODAY AND TONIGHT...

AREAS OF DENSE FOG THIS MORNING WILL GIVE WAY TO WIDESPREAD
SHOWERS AND THUNDERSTORMS LATER THIS MORNING BEFORE ENDING ACROSS
THE REGION THIS AFTERNOON. WHILE SOME OF THESE STORMS COULD BE
STRONG IN NATURE POSING A HAIL AND OR WIND THREAT...THE MORE
SIGNIFICANT SEVERE THUNDERSTORM POSSIBILITY TODAY SHOULD STAY TO
THE SOUTH OF THE REGION.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY...

A SIGNIFICANT COOL DOWN WILL COMMENCE LATE IN THE DAY TUESDAY
THROUGH TUESDAY NIGHT AND IT WILL REMAIN MUCH COLDER ACROSS THE
REGION THROUGH THE REMAINDER OF THE WORK WEEK. AT THIS TIME...IT
DOES NOT APPEAR THAT ANY SIGNIFICANT WINTER PRECIPITATION WILL BE
POSSIBLE WITH THIS COLDER AIRMASS IN PLACE TOWARDS LATE WEEK BUT
THIS POSSIBILITY WILL CONTINUE TO BE MONITORED IN FUTURE
FORECASTS.

.SPOTTER INFORMATION STATEMENT...

ACTIVATION OF EMERGENCY MANAGEMENT PERSONNEL...AMATEUR RADIO
OPERATORS...AND STORM SPOTTERS SHOULD NOT BE NEEDED BUT WILL BE
NECESSARY FOR COUNTIES FURTHER SOUTH OF THE REGION THIS MORNING.

ARZ060-061-070>073-LAZ001>006-010>014-017>022-TXZ097-108>112-
124>126-136>138-149>153-165>167-021800-
HEMPSTEAD-NEVADA-MILLER-LAFAYETTE-COLUMBIA-UNION-CADDO-BOSSIER-
WEBSTER-CLAIBORNE-LINCOLN-DE SOTO-RED RIVER-BIENVILLE-JACKSON-
OUACHITA-SABINE-NATCHITOCHES-WINN-GRANT-CALDWELL-LA SALLE-BOWIE-
FRANKLIN-TITUS-CAMP-MORRIS-CASS-WOOD-UPSHUR-MARION-SMITH-GREGG-
HARRISON-CHEROKEE-RUSK-PANOLA-NACOGDOCHES-SHELBY-ANGELINA-
SAN AUGUSTINE-
321 AM CST MON JAN 2 2017

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTH CENTRAL
ARKANSAS...SOUTHWEST ARKANSAS...NORTH CENTRAL LOUISIANA...
NORTHWEST LOUISIANA...EAST TEXAS AND NORTHEAST TEXAS.

.DAY ONE...TODAY AND TONIGHT...

AREAS OF DENSE FOG EARLY THIS MORNING WILL GIVE WAY TO WIDESPREAD
SHOWERS AND THUNDERSTORMS LATE THIS MORNING INTO THE AFTERNOON
HOURS BEFORE ENDING LATE IN THE AFTERNOON. SOME OF THESE STORMS
WILL BE STRONG TO SEVERE...PRODUCING DAMAGING THUNDERSTORM WIND
GUSTS...LARGE HAIL AND ISOLATED TORNADOES. BRIEF HEAVY DOWNPOURS
WILL ALSO ACCOMPANY THE STRONGEST STORMS TODAY.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY...

A SIGNIFICANT COOL DOWN WILL COMMENCE LATE IN THE DAY TUESDAY
THROUGH TUESDAY NIGHT AND IT WILL REMAIN MUCH COLDER ACROSS THE
REGION THROUGH THE REMAINDER OF THE WORK WEEK. AT THIS TIME...IT
DOES NOT APPEAR THAT ANY SIGNIFICANT WINTER PRECIPITATION WILL BE
POSSIBLE WITH THIS COLDER AIRMASS IN PLACE TOWARDS LATE WEEK BUT
THIS POSSIBILITY WILL CONTINUE TO BE MONITORED IN FUTURE
FORECASTS.

.SPOTTER INFORMATION STATEMENT...

ACTIVATION OF EMERGENCY MANAGEMENT PERSONNEL...AMATEUR RADIO
OPERATORS...AND STORM SPOTTERS WILL BE NEEDED LATER THIS MORNING
THROUGH THE AFTERNOON HOURS ACROSS THE REGION BECAUSE OF THE
LIKELIHOOD OF SEVERE THUNDERSTORMS.

13

In the hours before

Special weather statement, Jan 2, 8:29 AM CST, 2 hours 24 minutes before

Special Weather Statement
National Weather Service Shreveport LA
829 AM CST MON JAN 2 2017

LAZ017-TXZ152-153-165>167-021530-
Sabine LA-Sabine TX-Angelina TX-Nacogdoches TX-San Augustine TX-
Shelby TX-
829 AM CST MON JAN 2 2017

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN SABINE PARISH...
SOUTHEASTERN NACOGDOCHES...SOUTHEASTERN SHELBY...ANGELINA...SAN
AUGUSTINE AND SABINE COUNTIES UNTIL 930 AM CST...

At 828 AM CST, Doppler radar was tracking strong thunderstorms along
a line extending from Lufkin to 11 miles south of Huntington to 6
miles southwest of Colmesneil. Movement was northeast at 65 mph.

Nickel size hail and wind gusts up to 50 mph will be possible with
these storms.

Locations impacted include...
Lufkin, Milam, Hudson, Huntington, San Augustine, Zwolle, Hemphill,
Pineland, Patroon, Bland Lake, Neuville, Woden, Rosevine, Etoile,
Macune, Zavalla, Chireno, Huxley, Broaddus and Bronson.

A tornado watch remains in effect until 200 PM CST for northwestern
Louisiana...and eastern Texas.

LAT...LON 3107 9459 3135 9482 3185 9389 3185 9386
      3155 9357 3128 9351 3128 9353 3124 9356
      3119 9355 3117 9358 3116 9391 3114 9404
      3111 9406 3103 9447
TIME...MOT...LOC 1428Z 244DEG 58KT 3131 9474 3111 9457 3085 9451

12

Local storm report, Jan 2, 9:14 AM CST, 1 hour 39 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
914 AM CST MON JAN 2 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0705 AM     TSTM WND DMG     6 E LINDALE             32.51N 95.30W
01/02/2017                   SMITH              TX   LAW ENFORCEMENT

            NUMEROUS TREES DOWN ACROSS FM 14.

&&

AS

Local storm report, Jan 2, 9:22 AM CST, 1 hour 31 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
922 AM CST MON JAN 2 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0810 AM     TSTM WND DMG     5 ESE HENDERSON         32.12N 94.73W
01/02/2017                   RUSK               TX   LAW ENFORCEMENT

            SEVERAL TREES DOWN.

&&

AS

Local storm report, Jan 2, 9:24 AM CST, 1 hour 29 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
924 AM CST MON JAN 02 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0906 AM     TSTM WND DMG     6 S SAN AUGUSTINE       31.44N  94.11W
01/02/2017                   SAN AUGUSTINE      TX   LAW ENFORCEMENT

            TREE DOWN ON 1751 SOUTH OF 103

&&

EVENT NUMBER SHV1700002

25

Local storm report, Jan 2, 9:58 AM CST, 55 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
958 AM CST MON JAN 02 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0930 AM     TSTM WND DMG     6 NE SAN AUGUSTINE      31.59N  94.04W
01/02/2017                   SAN AUGUSTINE      TX   PUBLIC

            LARGE LIMBS / BRANCHES DOWN LESS THAN 2... CHICKEN
            HOUSE ROOF DAMAGED IN PATROON TX... WIND EST 55 MPH

&&

EVENT NUMBER SHV1700003

25

Local storm report, Jan 2, 10:01 AM CST, 52 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
1001 AM CST MON JAN 2 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1000 AM     HAIL             1 E SIBLEY              32.54N 93.28W
01/02/2017  E1.00 INCH       WEBSTER            LA   PUBLIC

            .

&&

AS

The office that day

Everything else NWS Shreveport, LA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jan 2, 2:24 AM CST	Special Weather Statement	SHV	Webster	51 min
Jan 2, 2:50 AM CST	Severe Thunderstorm Warning	SHV	Claiborne, Webster	40 min
Jan 2, 3:21 AM CST	Special Weather Statement	SHV	LaSalle	39 min
Jan 2, 3:23 AM CST	Special Weather Statement	SHV	Natchitoches	52 min
Jan 2, 4:00 AM CST	Special Weather Statement	SHV	Caldwell	45 min
Jan 2, 7:41 AM CST	Severe Thunderstorm Warning	SHV	Sabine	34 min
Jan 2, 7:55 AM CST	Special Weather Statement	SHV	De Soto	50 min
Jan 2, 8:46 AM CST	Severe Thunderstorm Warning	SHV	Sabine	44 min
Jan 2, 9:28 AM CST	Severe Thunderstorm Warning	SHV	De Soto, Natchitoches, Sabine	62 min
Jan 2, 10:18 AM CST	Severe Thunderstorm Warning	SHV	Bienville, De Soto, Grant, Natchitoches, Red River, Sabine and 1 more	42 min
Jan 2, 11:33 AM CST	Severe Thunderstorm Warning	SHV	Caldwell, Grant, Jackson, LaSalle, Winn	42 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2017 Every severe thunderstorm warning in 2017

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.