Alert archive / Louisiana / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 222, NWS Shreveport, LA

July 4, 2015Caldwell Parish, Grant Parish, Winn Parish, Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at Jul 4, 2015, 4:43 PM CDT for Caldwell Parish, Grant Parish, Winn Parish, Louisiana. It was in force for 47 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 4, 2015, 4:43 PM CDT (21:43 UTC)
Expired: Jul 4, 2015, 5:30 PM CDT
In force: 47 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Caldwell Parish, LA, Grant Parish, LA, Winn Parish, LA

The radar

The Ft Polk radar (KPOE), 95 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.

The nearest sounding before it

Shreveport, LA (KBAD), launched 12:00Z, 9.7 hours before the alert went out and 140 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: 1189 J/kg
Mixed-layer CIN: -59 J/kg
Mixed-layer LCL: 922 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 118 m²/s²
0-3 km storm-relative helicity: 94 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.2

Open this sounding in Storm Lab

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 Jul 4, 2:51 PM CDT, 1 hour 52 minutes earlier.

Area forecast discussion, Jul 4, 2:51 PM CDT, 1 hour 52 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SHREVEPORT LA
251 PM CDT SAT JUL 4 2015

.DISCUSSION...
MID-LEVEL VORT MAKING ITS WAY SLOWLY SSEWD THIS AFTERNOON...AND
CONTINUES TO ENHANCE CONVECTION ALONG AN OUTFLOW BOUNDARY FROM
NEAR CLARKSVILLE...SEWD TO NEAR SHREVEPORT. THE OUTFLOW BOUNDARY
DOES APPEAR TO BE MAKING SOME VERY SLOW SWWD PROGRESS. LATEST HI-
RES MODEL SOLUTIONS HAVE THE CONVECTION S OF I-20 BY 00Z. NOT
COMPLETELY CONFIDENT IN THE HI-RES SOLUTIONS GIVEN THE VERY SLOW
SWD PROPAGATION OF THE STORMS. HAVE KEPT THE ONGOING CONSERVATIVE
POPS FOR TONIGHT...AS THE LOSS OF DAYTIME HEATING WILL LIKELY PLAY
A ROLE IN DISSIPATING STORMS. THEN LATE TONIGHT...NOCTURNAL
REDEVELOPMENT WILL LIKELY BE SEEN SOMEWHERE ALONG THE LINGERING
OUTFLOW BOUNDARY.

ONGOING FLASH FLOOD WATCH WILL CONTINUE THROUGH 7 PM...AND WILL
ALLOW EVENING SHIFT TO REEVALUATE FOR THE OVERNIGHT CONVECTION.

EXPECT SOMEWHAT OF A REPEAT PERFORMANCE FOR SUNDAY...BEFORE THE
REGION BEGINS TO DRY OUT AS WE MOVE INTO NEXT WORK WEEK. THE UPPER
LEVEL RIDGE WILL BEGIN TO REINFORCE ITSELF OVER OUR REGION...AND
TEMPS WILL CONTINUE TO RATCHET UPWARDS THROUGH THE WORK WEEK. THE
ONLY EXCEPTION TO THIS WILL BE DURING TUESDAY WHEN A SHORTWAVE
MOVES ACROSS OK/AR. THIS WILL BRING SOME CHANCES FOR RAIN FOR
THOSE AREAS...BUT WILL COME TO AN END QUICKLY AS THE UPPER
DISTURBANCE DEPARTS TO THE NE.

CONSENSUS GUIDANCE APPEARS TO BE REASONABLE FOR TEMPS THROUGHOUT
THE PD...SO HAVE STAYED VERY CLOSE TO THOSE NUMBERS. /12/

&&

.PREV DISCUSSION... /ISSUED 149 PM CDT SAT JUL 4 2015/

AVIATION...
CLUSTER OF TSTMS..WITH VERY HEAVY RAIN..FQT LTG...AND POSSIBLE
GUSTY WINDS...MOVG SWD AHEAD OF A WELL DEFINED SHORT WAVE MOVING
SE INTO CENTRAL AR. MEANWHILE...SCATTERED CONVECTION REMAINING
JUST TO THE SOUTH OF CWA ACROSS SE TX/CENTRAL LA. TSTMS WILL
GRADUALLY SHIFT SOUTH OF KTXK BY AROUND 21Z...BUT WILL CONTINUE
FOR A FEW MORE HOURS AT KELD...AND WILL BEGIN TO INCREASE SHORTLY
AT KSHV. TSTMS TO LIKELY MOVE INTO KMLU LATER THIS AFTN. WHETHER
EAST TX TERMINALS SEE ANY TSTMS IS QUESTIONABLE. TERMINALS THAT
EXPERIENCE HEAVY RAIN WILL LIKELY SEE AREAS OF FOG OVERNIGHT...AS
LACK OF HEATING LIMITED TEMPS TO AROUND 70 DEGREES THUS FAR AT
KTXK AND KELD AND GROUND WILL REMAIN VERY WET. THIS COULD ALSO BE
THE CASE AT KSHV AND KMLU WHERE CONVECTION IS APPROACHING. ANOTHER
NOCTURNAL SHORT WAVE MAY AFFECT MAINLY EASTERN CWA...THUS PLACED
TEMPO TSTMS AFTER 05/12Z AT KELD AND 05/14Z AT KMLU./VII/.

&&

.PRELIMINARY POINT TEMPS/POPS...
SHV  74  90  75  94 /  30  30  20  10
MLU  73  88  73  92 /  50  50  20  10
DEQ  70  88  72  90 /  40  50  30  10
TXK  72  89  74  92 /  40  50  30  10
ELD  71  88  73  92 /  40  50  30  10
TYR  74  91  74  92 /  20  20  10  10
GGG  74  90  75  93 /  30  30  10  10
LFK  75  93  76  94 /  30  20  10  10

&&

.SHV WATCHES/WARNINGS/ADVISORIES...
AR...FLASH FLOOD WATCH UNTIL 7 PM CDT THIS EVENING FOR ARZ071>073.

LA...FLASH FLOOD WATCH UNTIL 7 PM CDT THIS EVENING FOR LAZ004>006-014.

OK...NONE.
TX...NONE.
&&

12

Hazardous weather outlook, Jul 4, 11:33 AM CDT, 5 hours 10 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SHREVEPORT LA
1133 AM CDT SAT JUL 4 2015

ARZ071>073-LAZ004>006-014-050715-
LAFAYETTE-COLUMBIA-UNION-CLAIBORNE-LINCOLN-OUACHITA-
1133 AM CDT SAT JUL 4 2015

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

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

SCATTERED...TO NUMEROUS THUNDERSTORMS WILL PERSIST INTO THE LATE
MORNING HOURS BEFORE DISSIPATING THIS AFTERNOON. IN ADDITION TO
HEAVY RAINFALL AND POTENTIAL FLASH FLOODING...SOME THUNDERSTORMS
MAY BECOME SEVERE WITH DAMAGING WINDS BEING THE PRIMARY THREAT.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY...

THUNDERSTORMS ARE EXPECTED TO DEVELOP DURING THE ENTIRE HOLIDAY
WEEKEND...NOT ONLY DURING PEAK HEATING...BUT MORE OVERNIGHT
ACTIVITY AS WELL. THESE STORMS WILL BE SLOW MOVERS AND COULD BRING
UP ONE TO THREE INCHES OF RAINFALL. LOCALLY HIGHER AMOUNTS WILL
BE POSSIBLE WHICH COULD LEAD TO ADDITIONAL FLASH FLOODING. HOT
AND DRIER WEATHER WILL RETURN FOR THE NEW WORK WEEK.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED LATER TODAY.

ARZ050-051-059>061-070-OKZ077-TXZ096-097-108>112-124-125-136-137-
149-150-152-165-050715-
SEVIER-HOWARD-LITTLE RIVER-HEMPSTEAD-NEVADA-MILLER-MCCURTAIN-
RED RIVER-BOWIE-FRANKLIN-TITUS-CAMP-MORRIS-CASS-WOOD-UPSHUR-SMITH-
GREGG-CHEROKEE-RUSK-NACOGDOCHES-ANGELINA-
1133 AM CDT SAT JUL 4 2015

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

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

SCATTERED THUNDERSTORMS WILL PERSIST INTO THE LATE MORNING HOURS
BEFORE DISSIPATING AND MOVING EASTWARD. SOME ADDITIONAL
DEVELOPMENT IS POSSIBLE THIS AFTERNOON. IN ADDITION TO HEAVY
RAINFALL AND POTENTIAL FLASH FLOODING...SOME THUNDERSTORMS MAY
BECOME SEVERE WITH DAMAGING WINDS BEING THE PRIMARY THREAT.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY...

THUNDERSTORMS ARE EXPECTED TO DEVELOP DURING THE ENTIRE HOLIDAY
WEEKEND...NOT ONLY DURING PEAK HEATING...BUT MORE OVERNIGHT
ACTIVITY AS WELL. THESE STORMS WILL BE SLOW MOVERS AND COULD BRING
UP ONE TO THREE INCHES OF RAINFALL. LOCALLY HIGHER AMOUNTS WILL
BE POSSIBLE WHICH COULD LEAD TO ADDITIONAL FLASH FLOODING. HOT
AND DRIER WEATHER WILL RETURN FOR THE NEW WORK WEEK.

.SPOTTER INFORMATION STATEMENT...

DUE TO THE ISOLATED NATURE OF ANY SEVERE WEATHER...SPOTTER
ACTIVATION IS NOT ANTICIPATED THROUGH TONIGHT.

LAZ001>003-010>013-017>022-TXZ126-138-151-153-166-167-050715-
CADDO-BOSSIER-WEBSTER-DE SOTO-RED RIVER-BIENVILLE-JACKSON-SABINE-
NATCHITOCHES-WINN-GRANT-CALDWELL-LA SALLE-MARION-HARRISON-PANOLA-
SHELBY-SAN AUGUSTINE-
1133 AM CDT SAT JUL 4 2015

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

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

SCATTERED THUNDERSTORMS WILL BE POSSIBLE TODAY AND TONIGHT ALONG
AND SOUTH OF I-20...SOME OF WHICH MAY BECOME SEVERE WITH DAMAGING
WINDS BEING THE PRIMARY THREAT. RAINFALL MAY BE HEAVY AT TIMES.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY...

THUNDERSTORMS ARE EXPECTED TO DEVELOP DURING THE ENTIRE HOLIDAY
WEEKEND...NOT ONLY DURING PEAK HEATING...BUT MORE OVERNIGHT
ACTIVITY AS WELL. THESE STORMS WILL BE SLOW MOVERS AND COULD BRING
UP ONE TO THREE INCHES OF RAINFALL. LOCALLY HIGHER AMOUNTS WILL
BE POSSIBLE WHICH COULD LEAD TO ADDITIONAL FLASH FLOODING. HOT
AND DRIER WEATHER WILL RETURN FOR THE NEW WORK WEEK.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED LATER TODAY.

12

In the hours before

Local storm report, Jul 4, 12:33 PM CDT, 4 hours 10 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
1233 PM CDT SAT JUL 04 2015

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

1000 AM     FLASH FLOOD      5 N PRESCOTT            33.87N  93.37W
07/04/2015                   NEVADA             AR   PUBLIC

            FLASH FLOODING WASHED OUT A BRIDGE ON NUBBIN HILL RD.

&&

EVENT NUMBER SHV1500672

20

Local storm report, Jul 4, 12:51 PM CDT, 3 hours 52 minutes before

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
      </p>
    </section>
  </main>
  <script src="index.js"></script>
</body>
</html>

Local storm report, Jul 4, 1:06 PM CDT, 3 hours 37 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
106 PM CDT SAT JUL 04 2015

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

1000 AM     FLASH FLOOD      8 ENE BLEVINS           33.91N  93.44W
07/04/2015                   NEVADA             AR   PUBLIC

            WATER ACROSS HWY 19 NEAR BRUSHY CREEK.

&&

EVENT NUMBER SHV1500674

20

Local storm report, Jul 4, 2:33 PM CDT, 2 hours 10 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
233 PM CDT SAT JUL 04 2015

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

0230 PM     FLASH FLOOD      DE KALB                 33.51N  94.62W
07/04/2015                   BOWIE              TX   EMERGENCY MNGR

            WATER OVER ROADWAY AT US 82 AND FM 1840

&&

EVENT NUMBER SHV1500675

25

Local storm report, Jul 4, 2:56 PM CDT, 1 hour 47 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
256 PM CDT SAT JUL 04 2015

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

0230 PM     FLASH FLOOD      ASHDOWN                 33.67N  94.13W
07/04/2015                   LITTLE RIVER       AR   LAW ENFORCEMENT

            SOME ROADWAYS COVERED WITH WATER IN ASHDOWN ARKANSAS

&&

EVENT NUMBER SHV1500676

25

Local storm report, Jul 4, 3:38 PM CDT, 1 hour 5 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
338 PM CDT SAT JUL 04 2015

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

0230 PM     FLASH FLOOD      1 ESE DE KALB           33.50N  94.60W
07/04/2015                   BOWIE              TX   EMERGENCY MNGR

            HIGHWAY 82 FLOODED OUTSIDE OF DE KALB TOWARD MALTA

&&

EVENT NUMBER SHV1500677

25

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 4, 7:54 AM CDT	Flash Flood Warning	SHV	Bowie	4 hr
Jul 4, 12:35 PM CDT	Flash Flood Warning	SHV	Bowie	3 hr
Jul 4, 4:56 PM CDT	Special Weather Statement	SHV	Sabine	64 min
Jul 4, 5:17 PM CDT	Special Weather Statement	SHV	Red River	58 min
Jul 4, 5:52 PM CDT	Special Weather Statement	SHV	Sabine, San Augustine	38 min
Jul 4, 4:54 AM CDT	Flash Flood Watch	SHV	Claiborne, Lincoln, Ouachita, Union	14 hr
Jul 4, 9:28 AM CDT	Flash Flood Warning	SHV	Claiborne, Lincoln, Union	5 hr
Jul 4, 11:11 AM CDT	River Flood Warning	SHV	Grant, Natchitoches, Winn	7 days
Jul 4, 5:47 PM CDT	Special Weather Statement	SHV	Red River, Winn	58 min
Jul 4, 5:59 PM CDT	Severe Thunderstorm Warning	SHV	De Soto, Grant, Natchitoches, Red River, Sabine, Winn	46 min
Jul 4, 6:50 PM CDT	Special Weather Statement	SHV	Winn	40 min
Jul 4, 1:03 AM CDT	Special Weather Statement	SHV	Howard	57 min
Jul 4, 2:29 AM CDT	Severe Thunderstorm Warning	SHV	Hempstead, Nevada	61 min
Jul 4, 2:53 AM CDT	Severe Thunderstorm Warning	SHV	Hempstead, Howard	52 min
Jul 4, 3:09 AM CDT	Flash Flood Warning	SHV	Hempstead, Howard, Nevada	4 hr
Jul 4, 3:30 AM CDT	Severe Thunderstorm Warning	SHV	Hempstead, Nevada	60 min
Jul 4, 4:20 AM CDT	Severe Thunderstorm Warning	SHV	Howard, Sevier	55 min
Jul 4, 4:37 AM CDT	Special Weather Statement	SHV	Hempstead, Nevada	53 min
Jul 4, 5:34 AM CDT	Severe Thunderstorm Warning	SHV	Sevier	56 min
Jul 4, 6:20 AM CDT	Severe Thunderstorm Warning	SHV	Hempstead, Nevada	55 min
Jul 4, 6:54 AM CDT	Flash Flood Warning	SHV	Hempstead, Howard, Nevada, Sevier	6 hr

Nearby

Severe Thunderstorm Warnings in Louisiana, 2015 Every severe thunderstorm warning 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.