Alert archive / Arkansas / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 174, NWS Shreveport, LA

May 10, 2009Hempstead County, Nevada County, Arkansas

NWS Shreveport, LA issued this severe thunderstorm warning at May 10, 2009, 5:38 AM CDT for Hempstead County, Nevada County, Arkansas. It was in force for 52 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: May 10, 2009, 5:38 AM CDT (10:38 UTC)
Expired: May 10, 2009, 6:30 AM CDT
In force: 52 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon

Counties Hempstead County, AR, Nevada County, AR

The radar

The Shreveport radar (KSHV), 143 km from the middle of the area, began a volume at 10:40 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 (KSHV), launched 00:00Z, 10.6 hours before the alert went out and 138 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: 1854 J/kg
Mixed-layer CIN: -40 J/kg
Mixed-layer LCL: 737 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 80 m²/s²
0-3 km storm-relative helicity: 164 m²/s²
Significant tornado parameter: 1.5
Supercell composite: 8.2

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 May 10, 3:26 AM CDT, 2 hours 12 minutes earlier.

Area forecast discussion, May 10, 3:26 AM CDT, 2 hours 12 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SHREVEPORT LA
326 AM CDT SUN MAY 10 2009

.DISCUSSION...
WEATHER PATTERN IS SOMEWHAT COMPLICATED THIS MORNING. WILL TRY TO
DESCRIBE IT AS BEST AS POSSIBLE. AT THE SURFACE...A STATIONARY COLD
FRONT HAS BEEN WAVERING ALONG THE I-20 CORRIDOR. NORTH OF THE
FRONT A COOL DENSE AIRMASS IS IN PLACE. THIS AREA NORTH OF THE
FRONT HAS BEEN WHERE SLIGHTLY ELEVATED CONVECTION HAS PERSISTED
THROUGH THE EARLY MORNING HOURS. A MID LEVEL SHORTWAVE HAS
PROVIDED THE INSTABILITY NECESSARY TO MAINTAIN MUCH OF THIS
ACTIVITY...WITH AVAILABLE MOISTURE STREAMING IN FROM 925-850 MB IN
AN ISENTROPIC UPGLIDE SETUP. THESE STORMS HAVE PROVIDED FLASH
FLOOD CONDITIONS ACROSS HOWARD COUNTY AND RED RIVER COUNTIES AS
WELL AS NICKEL SIZE HAIL ACROSS MCCURTAIN COUNTY IN SOUTHEAST
OKLAHOMA.

UNFORTUNATELY...THIS SETUP WILL CONTINUE THROUGH MONDAY...MAINLY
NORTH OF I-20. AS INDIVIDUAL MID LEVEL IMPULSES SLIDE ACROSS THE
REGION...STORMS PRODUCING HEAVY RAINS AND DAMAGING WINDS WILL BE POSSIBLE.
HENCE...THE FLASH FLOOD WATCH WILL BE EXTENDED THROUGH 12Z MONDAY
MORNING. AT THIS TIME...SPC HAS MUCH OF THE REGION IN A SLIGHT
RISK FOR SEVERE WEATHER THROUGH DAY TWO.

LOOKS LIKE THE LAST IMPULSE MAY BE THE STRONGEST. THIS IS EXPECTED
TO MOVE ACROSS THE TARGET AREA DURING THE DAY ON MONDAY. FOLLOWING
THIS EVENT THE UPPER LEVEL PATTERN SHIFTS TO A SW TO NE FLOW WITH
DRIER AIR FORECAST TO INFILTRATE THE REGION. SHOULD SEE A GRADUAL
CLEARING AND DRYING TREND THROUGH THE END OF THE WEEK WITH ANOTHER
FRONT EXPECTED TOWARD THE END OF THE FORECAST PERIOD. /05/

&&

.AVIATION...
FRONT APPEARS TO BE JUST SOUTH OF THE INTERSTATE 20 CORRIDOR OF NE
TX AND N LA ATTM. MOSTLY MVFR CEILINGS THROUGH THE EARLY MORNING
HOURS WITH AN OCCASIONAL IFR CEILING SHOULD GIVE WAY TO LOW VFR
CEILING LATER IN THE DAY EXCEPT WHERE SHOWERS AND THUNDERSTORMS
OCCUR. WILL KEEP TSRA MENTION IN ACROSS TXK/ELD TERMINALS THIS
MORNING WITH CONVECTION CLOSER TO THE I-20 CORRIDOR DEPENDENT ON
DAYTIME HEATING. WILL MENTION VCTS NEARER THE I-20 CORRIDOR THROUGH
THE AFTERNOON HOURS. /13/

&&

.PRELIMINARY POINT TEMPS/POPS...
SHV  83  65  78  64  83 /  40  30  50  20  20
MLU  83  65  76  63  81 /  40  40  50  30  30
DEQ  71  60  66  59  78 /  70  70  70  30  40
TXK  76  59  69  60  80 /  50  60  70  30  30
ELD  79  59  69  61  78 /  50  50  70  40  40
TYR  82  65  78  64  85 /  40  20  40  20  10
GGG  83  64  79  63  85 /  40  20  40  20  10
LFK  87  68  85  69  87 /  50  20  20  20  10

&&

.SHV WATCHES/WARNINGS/ADVISORIES...
AR...FLASH FLOOD WATCH THROUGH MONDAY MORNING FOR THE FOLLOWING
     ZONES: ARZ050-051-059>061-070>073.

LA...NONE.
OK...FLASH FLOOD WATCH THROUGH MONDAY MORNING FOR THE FOLLOWING
     ZONES: OKZ077.

TX...FLASH FLOOD WATCH THROUGH MONDAY MORNING FOR THE FOLLOWING
     ZONES: TXZ096-097.

&&

05/13

Hazardous weather outlook, May 9, 11:46 AM CDT, 17 hours 52 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SHREVEPORT LA
1146 AM CDT SAT MAY 9 2009

ARZ050-051-059>061-070>073-LAZ001>006-010>014-OKZ077-TXZ096-097-
108>112-124>126-136>138-149>151-101200-
SEVIER-HOWARD-LITTLE RIVER-HEMPSTEAD-NEVADA-MILLER-LAFAYETTE-
COLUMBIA-UNION AR-CADDO-BOSSIER-WEBSTER-CLAIBORNE-LINCOLN-
UNION LA-DE SOTO-RED RIVER-BIENVILLE-JACKSON-OUACHITA-MCCURTAIN-
BOWIE-FRANKLIN-TITUS-CAMP-MORRIS-CASS-WOOD-UPSHUR-MARION-SMITH-
GREGG-HARRISON-CHEROKEE-RUSK-PANOLA-
1146 AM CDT SAT MAY 9 2009

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

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

STRONG TO SEVERE THUNDERSTORMS MAY DEVELOP EARLY THIS
AFTERNOON...ALONG AND NORTH OF I 20...WHERE A FRONTAL BOUNDARY
LIES. THE THREAT WILL SHIFT TO JUST SOUTH OF I 20 AS THE FRONT
SLOWLY DIPS SOUTHWARD THIS EVENING. STRONG INSTABILITY FROM
DAYTIME HEATING WILL AID IN THUNDERSTORM INITIATION THIS AFTERNOON.
EVEN WITH THE LOSS OF DAYTIME HEATING...EXPECT THUNDERSTORMS TO
CONTINUE AS THE LOW LEVEL JET KICKS IN TONIGHT...WITH LOCALLY
HEAVY RAINFALL AND THE POSSIBILITY FOR LARGE HAIL AND DAMAGING
WINDS.

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

THE SEVERE WEATHER AND HEAVY RAINFALL THREAT WILL CONTINUE THROUGH
AT LEAST SUNDAY NIGHT. FLASH FLOODING WILL BE A POSSIBILITY...
CONSIDERING THE RAINFALL EARLIER IN THE MONTH.

ANOTHER STORM SYSTEM AND ASSOCIATED COLD FRONT WILL ARRIVE LATE ON
WEDNESDAY INTO THURSDAY WITH YET ANOTHER POSSIBILITY OF STRONG TO
SEVERE THUNDERSTORMS.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION MAY BE NEEDED THIS AFTERNOON AND TONIGHT.

LAZ017>022-TXZ152-153-165>167-101200-
SABINE LA-NATCHITOCHES-WINN-GRANT-CALDWELL-LA SALLE-NACOGDOCHES-
SHELBY-ANGELINA-SAN AUGUSTINE-SABINE TX-
1146 AM CDT SAT MAY 9 2009

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

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

SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS MAY DEVELOP THIS
AFTERNOON...AS A SOUTHWARD MOVING COLD FRONT ENTERS A MODERATELY
UNSTABLE ENVIRONMENT. THIS ACTIVITY WILL LIKELY DISSIPATE SHORTLY
AFTER SUNSET.

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

THUNDERSTORMS ARE EXPECTED TO DEVELOP ONCE AGAIN SUNDAY AND
MONDAY...AS THE FRONTAL BOUNDARY CONTINUES TO SLOWLY PUSH
SOUTHWARD. SOME STORMS MAY REACH SEVERE LIMITS...WITH LARGE HAIL
AND DAMAGING WINDS AS THE MAIN THREATS.

ANOTHER STORM SYSTEM AND ASSOCIATED COLD FRONT WILL ARRIVE LATE ON
WEDNESDAY INTO THURSDAY WITH YET ANOTHER POSSIBILITY OF STRONG TO
SEVERE THUNDERSTORMS.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION WILL LIKELY NOT BE NEEDED THIS AFTERNOON OR TONIGHT.

12

In the hours before

Special weather statement, May 10, 2:51 AM CDT, 2 hours 47 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
251 AM CDT SUN MAY 10 2009

ARZ051-100815-
HOWARD-
251 AM CDT SUN MAY 10 2009

...SIGNIFICANT WEATHER ALERT...

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A SIGNIFICANT
WEATHER ALERT...EFFECTIVE UNTIL 315 AM CDT...FOR THE FOLLOWING
COUNTY...

IN SOUTHWEST ARKANSAS...
     HOWARD...

INCLUDING THE FOLLOWING LOCATIONS...
     CENTER POINT...CORINTH AND DIERKS...

AT 250 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR CENTER POINT...OR 5 MILES SOUTHEAST OF
DIERKS...MOVING EAST AT 20 MPH...AS IT AFFECTS MAINLY RURAL AREAS OF
EASTERN HOWARD COUNTY.

PEA SIZE HAIL AND WIND GUSTS OF 30 TO 40 MPH ARE EXPECTED WITH THIS STORM.

15

Local storm report, May 10, 2:54 AM CDT, 2 hours 44 minutes before

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Local storm report, May 10, 3:05 AM CDT, 2 hours 33 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
305 AM CDT SUN MAY 10 2009

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

0300 AM     FLASH FLOOD      5 S DIERKS              34.05N 94.02W
05/10/2009                   HOWARD             AR   LAW ENFORCEMENT

            HIGH WATER REPORTED ACROSS HWY 278 BETWEEN DIERKS AND
            NASHVILLE.

0300 AM     FLASH FLOOD      W DIERKS                34.12N 94.02W
05/10/2009                   HOWARD             AR   LAW ENFORCEMENT

            HIGH WATER REPORTED WEST OF DIERKS ON HWY 70.

&&

MBERRY

Special weather statement, May 10, 3:30 AM CDT, 2 hours 8 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
330 AM CDT SUN MAY 10 2009

ARZ059-TXZ097-100930-
BOWIE-LITTLE RIVER-
330 AM CDT SUN MAY 10 2009

...SIGNIFICANT WEATHER ALERT...

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A SIGNIFICANT
WEATHER ALERT...EFFECTIVE UNTIL 430 AM CDT...FOR THE FOLLOWING
COUNTIES...

IN SOUTHWEST ARKANSAS...
     LITTLE RIVER...
IN NORTHEAST TEXAS...
     BOWIE...

INCLUDING THE FOLLOWING LOCATIONS...
     ASHDOWN AND RICHMOND...

AT 329 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 8 MILES NORTHEAST OF DE KALB...OR 9 MILES
NORTHWEST OF NEW BOSTON...MOVING EAST AT 25 MPH. THIS STORM WILL TRACK
EAST ALONG THE RED RIVER BORDERING NORTHERN BOWIE AND SOUTHERN LITTLE
RIVER COUNTIES DURING THE NEXT HOUR.

DIME SIZE HAIL...AND WINDS 30 TO 40 MPH ARE EXPECTED WITH THIS STORM.
SHOULD THIS STORM INTENSIFY...A SEVERE THUNDERSTORM WARNING WILL BE
NEEDED.

15

Special weather statement, May 10, 4:45 AM CDT, 53 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
445 AM CDT SUN MAY 10 2009

ARZ059-060-101030-
HEMPSTEAD-LITTLE RIVER-
445 AM CDT SUN MAY 10 2009

...SIGNIFICANT WEATHER ALERT...

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A SIGNIFICANT
WEATHER ALERT...EFFECTIVE UNTIL 530 AM CDT...FOR THE FOLLOWING
COUNTIES...

IN SOUTHWEST ARKANSAS...
     LITTLE RIVER AND HEMPSTEAD...

INCLUDING THE FOLLOWING LOCATIONS...
     FULTON AND OGDEN...

AT 445 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR OGDEN...OR 7 MILES SOUTH OF ASHDOWN...MOVING
EAST AT 25 MPH.

DIME SIZE HAIL...AND WINDS 30 TO 40 MPH ARE EXPECTED WITH THIS STORM.
SHOULD THIS STORM INTENSIFY...A SEVERE THUNDERSTORM WARNING WILL BE
NEEDED.

15

Special weather statement, May 10, 5:12 AM CDT, 26 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
512 AM CDT SUN MAY 10 2009

ARZ050-059-OKZ077-TXZ096-097-101100-
BOWIE-LITTLE RIVER-MCCURTAIN-RED RIVER-SEVIER-
512 AM CDT SUN MAY 10 2009

...SIGNIFICANT WEATHER ALERT...

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A SIGNIFICANT
WEATHER ALERT...EFFECTIVE UNTIL 600 AM CDT...FOR THE FOLLOWING
COUNTIES...

IN SOUTHWEST ARKANSAS...
     LITTLE RIVER AND SEVIER...
IN SOUTHEAST OKLAHOMA...
     MCCURTAIN...
IN NORTHEAST TEXAS...
     RED RIVER AND BOWIE...

INCLUDING THE FOLLOWING LOCATIONS...
     ARKINDA...DE QUEEN...FOREMAN...HORATIO...WINTHROP...BROKEN BOW
     AND IDABEL...

AT 509 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 11 MILES WEST OF ARKINDA...OR 15 MILES WEST OF
FOREMAN...MOVING EAST AT 30 MPH.

DIME SIZE HAIL IS EXPECTED WITH THIS STORM.

05

The office that day

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

Issued	Product	Office	Counties	Lasted
May 9, 10:16 PM CDT	Flash Flood Warning	SHV	Bowie	3 hr
May 9, 10:21 PM CDT	Severe Thunderstorm Warning	SHV	Bowie	24 min
May 9, 10:41 PM CDT	Severe Thunderstorm Warning	SHV	Bowie	64 min
May 10, 1:05 AM CDT	Severe Thunderstorm Warning	SHV	Red River	55 min
May 10, 1:50 AM CDT	Severe Thunderstorm Warning	SHV	Red River	55 min
May 10, 2:05 AM CDT	Flash Flood Warning	SHV	Red River	12 hr
May 10, 6:31 AM CDT	Flash Flood Warning	SHV	Bowie	8 hr
May 10, 10:00 AM CDT	River Flood Warning	SHV	Bowie, Red River	6 days
May 10, 11:20 AM CDT	River Flood Warning	SHV	Bienville, Bossier, Red River, Webster	7 days
May 10, 11:22 AM CDT	River Flood Warning	SHV	Bienville, Bossier, Caddo, Natchitoches, Red River	6 days
May 10, 11:22 AM CDT	River Flood Warning	SHV	Grant, Natchitoches, Red River	10 days
May 10, 1:12 PM CDT	Severe Thunderstorm Warning	SHV	Winn	48 min
May 10, 3:16 PM CDT	Tornado Warning	SHV	Bienville, Jackson, Natchitoches, Red River, Winn	29 min
May 10, 3:43 PM CDT	Tornado Warning	SHV	Bienville, Jackson, Natchitoches, Winn	47 min
May 10, 4:29 PM CDT	Tornado Warning	SHV	Grant, Natchitoches, Winn	46 min
May 10, 4:55 PM CDT	Tornado Warning	SHV	Natchitoches, Red River	35 min
May 10, 5:18 PM CDT	Severe Thunderstorm Warning	SHV	Caldwell, Grant, LaSalle, Winn	42 min
May 10, 5:39 PM CDT	Severe Thunderstorm Warning	SHV	Bienville, Natchitoches, Red River	51 min
May 10, 6:07 PM CDT	Severe Thunderstorm Warning	SHV	De Soto, Natchitoches, Red River	38 min
May 10, 6:40 PM CDT	Severe Thunderstorm Warning	SHV	Caldwell	35 min
May 10, 12:58 AM CDT	Severe Thunderstorm Warning	SHV	Howard, Sevier	32 min
May 10, 2:36 AM CDT	Severe Thunderstorm Warning	SHV	Hempstead, Howard	54 min
May 10, 3:21 AM CDT	Severe Thunderstorm Warning	SHV	Nevada	54 min
May 10, 4:57 AM CDT	Severe Thunderstorm Warning	SHV	Hempstead, Little River	63 min
May 10, 7:26 AM CDT	Flash Flood Warning	SHV	Nevada	7 hr
May 10, 9:58 AM CDT	River Flood Warning	SHV	Howard, Little River, Sevier	6 days
May 10, 2:17 PM CDT	Flash Flood Warning	SHV	Hempstead, Howard, Little River, Sevier	4 hr
May 10, 4:03 PM CDT	Flash Flood Warning	SHV	Nevada	57 min

Nearby

Severe Thunderstorm Warnings in Arkansas, 2009 Every severe thunderstorm warning in 2009

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.