Alert archive / Louisiana / Special Weather Statements in 2016

Special Weather Statement, NWS Shreveport, LA

August 7, 2016Webster Parish, Louisiana

NWS Shreveport, LA issued this special weather statement at Aug 7, 2016, 8:49 PM CDT for Webster Parish, Louisiana. It was in force for 41 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 7, 2016, 8:49 PM CDT (01:49 UTC)
Expired: Aug 7, 2016, 9:30 PM CDT
In force: 41 min
Issued by: NWS Shreveport, LA

County Webster Parish, LA

The radar

The Shreveport radar (KSHV), 28 km from the middle of the area, began a volume at 01:51 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

Shreveport, LA (KBAD), launched 00:00Z, 1.8 hours before the alert went out and 19 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: 1494 J/kg
Mixed-layer CIN: -48 J/kg
Mixed-layer LCL: 1709 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 21 m²/s²
0-3 km storm-relative helicity: 31 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Aug 7, 6:43 PM CDT, 2 hours 6 minutes earlier.

Area forecast discussion, Aug 7, 6:43 PM CDT, 2 hours 6 minutes before

Area Forecast Discussion
National Weather Service Shreveport LA
643 PM CDT SUN AUG 7 2016

.AVIATION...
Convection across area mostly concentrated across portions of sw
AR to the north of the KTXK and KELD terminals. However the slow
se cell movmt will bring a few storms into KELD btwn 08/00-01z and
possible into KMLU after 01z as some of these cells may continue
beyond sunset. Elsewhere, only very isold convection will diminish
before sunset. With virtually no change in upper pattern, expect
similar aftn convection Monday across sw AR and possibly northern
LA. Little if any fog or low clouds expected overnight and winds
to remain around 5 kts or less thru period./VII/.

&&

.PREV DISCUSSION... /issued 245 PM CDT SUN AUG 7 2016/

DISCUSSION...
Convection waited a little late to get going today compared to 24
hours ago but starting to see some storms pop now with the aid of
afternoon heating in the cu field across our southern zones and
more associated with mid level influences north of our region. As
hinted to in the morning discussion...upper ridge has shifted
enough south and west into southern Texas that disturbances
rounding the ridge across our northern and eastern zones will have
the capability to produce scattered showers and thunderstorms the
next several afternoons before dissipating during the overnight
hours. Seeing the first of these weaknesses across N Ar attm and
as it propagates sse...it should skirt our northern and eastern
zones before dissipating much later this evening.

The other story is the heat. The good news is we are not seeing
113+ degree heat index values today as has been the case the last
several days across our eastern zones but the cloud cover has
helped to limit the rapid warmup today...at least across much of S
Ar. Being on the out edge of the upper ridge axis may result in
the development of elevated cloud cover overnight which may tend
to limit sfc heating once again on Monday. Models all over the
place on whether or not this will occur and if so...just how
expansive this cloud cover will be. For this reason...we will play
it safe and extend the Heat Advisory areawide through Monday/7 pm.

By mid week...the upper ridge to our south and west does begin to
build back into the region with at the very least a continuation
to the heat and likely advisory criteria if not excessive heat
category for at least a portion of our region. The good news is
this relocation of the upper ridge closer to our region appears to
be temporary as a longwave trough begins to spill into the plains
by the end of the work week. This trough will be accompanied by a
strong cold front which should result in increased rain chances
and cooler temperatures by next weekend. Until then...most of our
region will continue to suffer through the heat with only small
rain chances...more centered across our eastern zones through the
upcoming work week.

Prelims to follow...13.

&&

.PRELIMINARY POINT TEMPS/POPS...
SHV  76  96  77  99 /  20  30  20  20
MLU  75  93  76  96 /  40  30  20  30
DEQ  72  94  74  96 /  20  30  20  30
TXK  74  94  75  98 /  30  30  20  30
ELD  74  93  74  95 /  40  30  20  30
TYR  78  99  78 100 /  20  20  20  20
GGG  76  97  77 100 /  20  20  20  20
LFK  75  97  76  99 /  20  20  20  20

&&

.SHV Watches/Warnings/Advisories...
AR...Heat Advisory until 7 PM CDT Monday for ARZ050-051-059>061-
     070>073.

LA...Heat Advisory until 7 PM CDT Monday for LAZ001>006-010>014-
     017>022.

OK...Heat Advisory until 7 PM CDT Monday for OKZ077.

TX...Heat Advisory until 7 PM CDT Monday for TXZ096-097-108>112-
     124>126-136>138-149>153-165>167.

&&

Hazardous weather outlook, Aug 7, 10:46 AM CDT, 10 hours 3 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SHREVEPORT LA
1046 AM CDT SUN AUG 7 2016

ARZ050-051-059>061-070>073-LAZ001>006-010>014-017>022-OKZ077-
TXZ096-097-108>112-124>126-136>138-149>153-165>167-081200-
SEVIER-HOWARD-LITTLE RIVER-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-MCCURTAIN-BOWIE-FRANKLIN-TITUS-CAMP-
MORRIS-CASS-WOOD-UPSHUR-MARION-SMITH-GREGG-HARRISON-CHEROKEE-RUSK-
PANOLA-NACOGDOCHES-SHELBY-ANGELINA-SAN AUGUSTINE-
1046 AM CDT SUN AUG 7 2016

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

.DAY ONE...THIS AFTERNOON AND TONIGHT...

HOT TEMPERATURES APPROACHING 100 DEGREES...WHEN COMBINED WITH
MODERATE HUMIDITY WILL PRODUCE HEAT INDEX VALUES OF 105 TO 109
DEGREES THIS AFTERNOON WITH A HEAT ADVISORY IN EFFECT. TAKE
PRECAUTIONS WHEN WORKING OR PLAYING OUTDOORS WITH BREAKS IN THE
SHADE...WATER AND IF POSSIBLE...IN AIR CONDITIONING. SOME RELIEF
WILL COME IN THE FORM OF SCATTERED SHOWERS AND THUNDERSTORMS WITH
STRONGER STORMS PRODUCING GUSTY WINDS...HEAVY DOWNPOURS...AND
DANGEROUS CLOUD TO GROUND LIGHTNING. WHEN THUNDER ROARS...GO
INDOORS.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY...

SCATTERED AFTERNOON THUNDERSTORMS WILL CONTINUE INTO EARLY THIS
WEEK WITH COVERAGE BECOMING MORE ISOLATED LATER IN THE WEEK. IN
ADDITION...AFTERNOON HEAT INDEX VALUES WILL CONTINUE TO PEAK NEAR
OR ABOVE 105 DEGREES DURING THE AFTERNOON HOURS.

.SPOTTER INFORMATION STATEMENT...

ACTIVATION OF EMERGENCY MANAGEMENT PERSONNEL...AMATEUR RADIO
OPERATORS AND STORM SPOTTERS IS NOT ANTICIPATED THROUGH TONIGHT.

13

In the hours before

Special weather statement, Aug 7, 7:47 PM CDT, 1 hour 2 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
747 PM CDT SUN AUG 7 2016

ARZ070-071-LAZ001-002-080130-
MILLER AR-LAFAYETTE AR-BOSSIER LA-CADDO LA-
747 PM CDT SUN AUG 7 2016

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN LAFAYETTE AND SOUTH
CENTRAL MILLER COUNTIES...NORTH CENTRAL CADDO AND NORTHWESTERN
BOSSIER PARISHES UNTIL 830 PM CDT...

AT 747 PM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR
IDA...OR 18 MILES WEST OF SPRINGHILL...MOVING SOUTHEAST AT 35 MPH.

DIME SIZE HAIL AND WIND GUSTS UP TO 50 MPH WILL BE POSSIBLE WITH THIS
STORM.

LOCATIONS IMPACTED INCLUDE...
PLAIN DEALING...KIBLAH...CANALE...BOLINGER...ALDEN BRIDGE AND ROCKY
MOUNT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

&&

LAT...LON 3306 9391 3312 9376 3280 9348 3271 9374
TIME...MOT...LOC 0047Z 329DEG 28KT 3300 9378

20

Special weather statement, Aug 7, 7:52 PM CDT, 57 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
752 PM CDT SUN AUG 7 2016

LAZ004-005-012-013-080145-
CLAIBORNE LA-LINCOLN LA-BIENVILLE LA-JACKSON LA-
752 PM CDT SUN AUG 7 2016

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN JACKSON...
NORTHEASTERN BIENVILLE...SOUTHWESTERN LINCOLN AND SOUTH CENTRAL
CLAIBORNE PARISHES UNTIL 845 PM CDT...

AT 752 PM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR
HOMER...MOVING SOUTH AT 10 MPH.

WIND GUSTS UP TO 50 MPH WILL BE POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
GRAMBLING...ARCADIA...GIBSLAND...SIMSBORO...ATHENS...BRYCELAND...
MOUNT LEBANON...LAKE CLAIRBORNE...SPRING LAKE AND AYCOCK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

&&

LAT...LON 3273 9312 3277 9290 3235 9255 3243 9303
TIME...MOT...LOC 0052Z 342DEG 9KT 3272 9298

VII

Special weather statement, Aug 7, 8:01 PM CDT, 48 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
801 PM CDT SUN AUG 7 2016

LAZ012-013-019>022-080200-
LA SALLE LA-BIENVILLE LA-CALDWELL LA-JACKSON LA-WINN LA-GRANT LA-
801 PM CDT SUN AUG 7 2016

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN JACKSON...SOUTHEASTERN
BIENVILLE...SOUTHWESTERN CALDWELL...LA SALLE...WINN AND GRANT
PARISHES UNTIL 900 PM CDT...

AT 759 PM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM
NEAR JONESBORO...MOVING SOUTH SOUTHEAST AT 15 MPH. ANOTHER STRONG
STORM HAS DEVELOPED JUST SOUTH OF JENA OVER LAKE CATAHOULA.

WIND GUSTS UP TO 50 MPH WILL BE POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
WINNFIELD...JONESBORO...JENA...COLFAX...OLLA...MIDWAY...URANIA...
HODGE...POLLOCK...DRY PRONG...NORTH HODGE...TULLOS...DODSON...
GEORGETOWN...EAST HODGE...CALVIN...QUITMAN...ATLANTA...
SIKES AND WILLIANA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

&&

LAT...LON 3133 9201 3134 9204 3132 9208 3134 9209
      3135 9207 3135 9208 3141 9215 3145 9216
      3146 9217 3147 9216 3148 9218 3147 9219
      3148 9221 3139 9266 3241 9294 3236 9254
      3172 9201
TIME...MOT...LOC 0059Z 324DEG 16KT 3223 9265

VII

Special weather statement, Aug 7, 8:02 PM CDT, 47 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
802 PM CDT SUN AUG 7 2016

ARZ072-073-LAZ003-004-006-014-080145-
UNION AR-COLUMBIA AR-UNION LA-OUACHITA LA-CLAIBORNE LA-WEBSTER LA-
802 PM CDT SUN AUG 7 2016

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN COLUMBIA AND
SOUTHERN UNION COUNTIES...NORTH CENTRAL WEBSTER...UNION...CLAIBORNE
AND NORTHEASTERN OUACHITA PARISHES UNTIL 845 PM CDT...

AT 802 PM CDT...DOPPLER RADAR WAS TRACKING A LINE OF STRONG
THUNDERSTORMS ALONG A LINE EXTENDING FROM NEAR ATLANTA TO NEAR
GALION...AND MOVING SOUTH AT 20 MPH.

WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
HOMER...HUTTIG...JUNCTION CITY...SWARTZ...FARMERVILLE...
HAYNESVILLE...BERNICE...STERLINGTON...EMERSON...SHONGALOO...
ATLANTA...COOLEY...MARION...LISBON...SPEARSVILLE...LILLIE...
LOCH LOMON...LOCKHART...HORSEHEAD AND SHILOH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THESE STORMS.
LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.

&&

LAT...LON 3260 9193 3269 9252 3272 9252 3276 9263
      3276 9282 3274 9284 3282 9333 3319 9327
      3302 9208 3300 9207 3287 9208 3284 9206
      3274 9205 3273 9207 3269 9205 3270 9203
      3271 9204 3271 9197 3266 9194 3266 9191
TIME...MOT...LOC 0102Z 001DEG 17KT 3308 9312 3292 9175

20

Special weather statement, Aug 7, 8:38 PM CDT, 11 minutes before

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Special weather statement, Aug 7, 8:49 PM CDT, 0 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 8, 3:31 PM CDT	Special Weather Statement	SHV	Red River	44 min
Aug 8, 5:01 PM CDT	Special Weather Statement	SHV	Camp, Franklin, Gregg, Titus, Upshur	59 min
Aug 8, 5:14 PM CDT	Areal Flood Advisory	SHV	Camp, Titus, Upshur	3 hr
Aug 7, 7:18 PM CDT	Special Weather Statement	SHV	Lincoln	57 min
Aug 7, 7:42 PM CDT	Special Weather Statement	SHV	Bossier	48 min
Aug 7, 7:47 PM CDT	Special Weather Statement	SHV	Bossier	43 min
Aug 7, 7:52 PM CDT	Special Weather Statement	SHV	Lincoln	53 min
Aug 7, 8:01 PM CDT	Special Weather Statement	SHV	Grant, Jackson, LaSalle, Winn	59 min
Aug 7, 8:02 PM CDT	Special Weather Statement	SHV	Claiborne, Union	43 min
Aug 7, 8:25 PM CDT	Areal Flood Advisory	SHV	Bienville, Claiborne, Jackson, LaSalle, Lincoln, Winn	3 hr
Aug 7, 8:38 PM CDT	Special Weather Statement	SHV	Bienville, Jackson, Lincoln, Ouachita	52 min
Aug 7, 8:59 PM CDT	Areal Flood Advisory	SHV	Bossier, Webster	3 hr
Aug 7, 10:02 PM CDT	Areal Flood Advisory	SHV	Grant, LaSalle, Natchitoches, Winn	3 hr
Aug 7, 10:07 PM CDT	Special Weather Statement	SHV	Grant, LaSalle, Natchitoches, Sabine	38 min
Aug 7, 7:21 PM CDT	Special Weather Statement	SHV	Columbia, Union	39 min

Nearby

Special Weather Statements in Louisiana, 2016 Every special weather statement 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.