Alert archive / Arkansas / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 73, NWS Little Rock, AR

April 21, 2004Johnson County, Arkansas

NWS Little Rock, AR issued this severe thunderstorm warning at Apr 21, 2004, 9:13 PM CDT for Johnson County, Arkansas. 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: Apr 21, 2004, 9:13 PM CDT (02:13 UTC)
Expired: Apr 21, 2004, 10:00 PM CDT
In force: 47 min
Issued by: NWS Little Rock, AR
Area: Counties, with a storm outline in the text

County Johnson County, AR

The radar

The Western Arkansas radar (KSRX), 87 km from the middle of the area, began a volume at 02:15 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

Springfield, MO (KSGF), launched 00:00Z, 2.2 hours before the alert went out and 151 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: 91 J/kg
Mixed-layer CIN: -91 J/kg
Mixed-layer LCL: 1996 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 53 m²/s²
0-3 km storm-relative helicity: 152 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Little Rock, AR wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 21, 2:30 PM CDT, 6 hours 43 minutes earlier.

Area forecast discussion, Apr 21, 2:30 PM CDT, 6 hours 43 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LITTLE ROCK AR
230 PM CDT WED APR 21 2004

.DISCUSSION...
A WESTERLY FLOW ALOFT WILL CONTINUE TONIGHT. THIS WILL SEND A SERIES
OF SHORT WAVES TOWARDS ARKANSAS. SCATTERED TO NUMEROUS SHOWERS AND
THUNDERSTORMS WILL CONTINUE TO DEVELOP AND MOVE ACROSS MANY AREAS OF
ARKANSAS TONIGHT. SOME STORMS MAY BECOME SEVERE. THERE IS A MODERATE
RISK OF SEVERE THUNDERSTORMS OVER THE WESTERN SECTIONS TONIGHT
THROUGH EARLY THURSDAY...THEN THE AREA OF MODERATE RISK GROWS TO
COVER MOST OF ARKANSAS THURSDAY THROUGH THURSDAY NIGHT. THERE IS
ALSO A SLIGHT RISK OF SEVERE SURROUNDING THE MODERATE RISK AREA
WHICH COVERS ALL OF ARKANSAS FOR DAY 1 AND MOST OF THE STATE ON DAY
2. CONDITIONS SHOULD IMPROVE BY DAY 3.
&&

.PRELIMINARY POINT TEMPS/POPS...
LITTLE ROCK AR    60  77  63  75 /  60  40  40  40
HARRISON AR       55  69  56  68 /  80  50  60  60
HOT SPRINGS AR    61  76  63  75 /  60  30  40  40
PINE BLUFF AR     62  78  64  79 /  50  30  30  40
MOUNTAIN HOME AR  57  70  57  70 /  70  50  60  60
MONTICELLO AR     63  79  65  81 /  50  30  20  30
SEARCY AR         60  77  61  75 /  70  40  40  40
MOUNT IDA AR      60  75  63  74 /  60  40  40  50
RUSSELLVILLE AR   60  74  60  74 /  70  40  40  50
&&

.LZK WATCHES/WARNINGS/ADVISORIES...NONE.
&&

38

Hazardous weather outlook, Apr 21, 11:08 AM CDT, 10 hours 5 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE LITTLE ROCK AR
1108 AM CDT WED APR 21 2004

ARZ003>007-012>016-021>025-030>034-037>047-052>057-062>069-221000-
ARKANSAS-BAXTER-BOONE-BRADLEY-CALHOUN-CLARK-CLEBURNE-CLEVELAND-
CONWAY-DALLAS-DESHA-DREW-FAULKNER-FULTON-GARLAND-GRANT-HOT SPRING-
INDEPENDENCE-IZARD-JACKSON-JEFFERSON-JOHNSON-LINCOLN-LOGAN-LONOKE-
MARION-MONROE-MONTGOMERY-NEWTON-OUACHITA-PERRY-PIKE-POLK-POPE-
PRAIRIE-PULASKI-SALINE-SCOTT-SEARCY-SHARP-STONE-VAN BUREN-WHITE-
WOODRUFF-YELL-
1108 AM CDT WED APR 21 2004

THIS HAZARDOUS WEATHER OUTLOOK IS FOR A LARGE PART OF ARKANSAS.

.DAY ONE...TODAY AND TONIGHT

THERE IS A MODERATE RISK OF SEVERE THUNDERSTORMS ACROSS WESTERN
ARKANSAS TONIGHT.

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS OVER THE REMAINDER OF
ARKANSAS TONIGHT.

SCATTERED SHOWERS AND THUNDERSTORMS WILL CONTINUE TO MOVE THROUGH
CENTRAL ARKANSAS THROUGH THE EARLY AFTERNOON HOURS...AND WILL WEAKEN
AS THEY PUSH INTO THE SOUTHERN COUNTIES. THERE WILL BE A LULL LATER
THIS AFTERNOON BEFORE THUNDERSTORMS REDEVELOP TONIGHT.

A SYSTEM ALOFT WILL HEAD ACROSS THE SOUTHERN PLAINS THIS AFTERNOON.
THE SYSTEM WILL INTERACT WITH A DRY LINE IN CENTRAL OKLAHOMA...OR A
BOUNDARY SEPARATING MOIST AIR TO ITS EAST FROM MUCH DRIER AIR TO ITS
WEST. THE INTERACTION WILL TRIGGER SCATTERED TO NUMEROUS
THUNDERSTORMS...WITH SEVERE STORMS LIKELY.

STORMS THAT DEVELOP IN CENTRAL AND EASTERN OKLAHOMA WILL TRACK INTO
WESTERN ARKANSAS TONIGHT. STORMS THAT BECOME SEVERE WILL PRODUCE
LARGE HAIL...DAMAGING WINDS AND POSSIBLE TORNADOES.

THE STORMS WILL CONTINUE MOVING NORTHEAST...AND WILL ARRIVE IN THE
NORTHERN COUNTIES AFTER MIDNIGHT. WITH A STALLED FRONT NEAR THE
ARKANSAS AND MISSOURI BORDER...THE FRONT WILL ACT AS A FOCUS FOR
HEAVY RAINFALL. ONE TO TWO INCHES OF RAIN MAY OCCUR...WITH LOCALLY
HEAVIER AMOUNTS.

THE REGION MOST PRONE TO SEVERE WEATHER AND HEAVY RAINFALL TONIGHT
INCLUDES AREAS NORTH AND WEST OF MENA...MORRILTON AND HARDY.

ELSEWHERE ACROSS ARKANSAS...THUNDERSTORMS WILL BE MORE SCATTERED
WITH LESS OF A POTENTIAL FOR SEVERE WEATHER AND HEAVY RAIN.
HOWEVER...ISOLATED SEVERE STORMS MAY STILL OCCUR...WITH MAINLY LARGE
HAIL POSSIBLE.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

STORMS THAT DEVELOP TONIGHT WILL EXIT THE STATE INTO MISSOURI
THURSDAY MORNING. THERE WILL BE ANOTHER LULL THURSDAY
AFTERNOON...WITH MORE STORMS IN THE FORECAST THURSDAY NIGHT.

THE WEATHER PATTERN WILL NOT CHANGE THROUGH AT LEAST SATURDAY. A
FRONTAL BOUNDARY WILL REMAIN STALLED ACROSS NORTHERN ARKANSAS. GIVEN
THIS...STORMS THAT DEVELOP THE REMAINDER OF THE WEEK WILL BE MOST
LIKELY ACROSS THE NORTHERN HALF OF THE STATE.

THE STORMS THAT ARE EXPECTED WILL OCCUR MAINLY AT NIGHT...WITH
STORMS MENTIONED THURSDAY NIGHT AND FRIDAY NIGHT. SEVERE WEATHER
WILL REMAIN A POSSIBILITY...WITH AREAS OF HEAVY TO EXCESSIVE
RAINFALL. FLASH FLOODING MAY OCCUR IN SOME SPOTS.

THE PATTERN WILL FINALLY CHANGE THIS WEEKEND. A COLD FRONT WILL PUSH
THROUGH THE REGION FROM THE WEST SATURDAY NIGHT AND SUNDAY...WITH
COOLER AND DRIER AIR TO FOLLOW MONDAY AND TUESDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL LIKELY BE REQUIRED TONIGHT IN NORTHERN AND
WESTERN ARKANSAS.

46

In the hours before

Local storm report, Apr 21, 7:19 PM CDT, 1 hour 54 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LITTLE ROCK AR
719 PM CDT WED APR 21 2004

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

0712 PM     HAIL             1 NE MAYFLOWER          34.98N 92.41W
04/21/2004  0.75 INCH        FAULKNER           AR   AMATEUR RADIO

&&

28

Local storm report, Apr 21, 7:40 PM CDT, 1 hour 33 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LITTLE ROCK AR
740 PM CDT WED APR 21 2004

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

0727 PM     HAIL             7 E MAYFLOWER           34.97N 92.30W
04/21/2004  1.00 INCH        FAULKNER           AR   AMATEUR RADIO

0730 PM     FLASH FLOOD      CONWAY                  35.09N 92.45W
04/21/2004                   FAULKNER           AR   AMATEUR RADIO

            SEVERAL HOUSES FLOODED.

&&

28

Local storm report, Apr 21, 8:03 PM CDT, 1 hour 10 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LITTLE ROCK AR
803 PM CDT WED APR 21 2004

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

0750 PM     HAIL             5 N MACON               34.99N 92.17W
04/21/2004  1.00 INCH        PULASKI            AR   TRAINED SPOTTER

            NICKEL TO OCCASIONAL QUARTER SIZE HAIL AT INTERSECTION OF
            HIGHWAYS 89 AND 107.

0759 PM     HAIL             CABOT                   34.97N 92.02W
04/21/2004  0.88 INCH        LONOKE             AR   PUBLIC

&&

28

Local storm report, Apr 21, 8:23 PM CDT, 50 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LITTLE ROCK AR
823 PM CDT WED APR 21 2004

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

0800 PM     HAIL             3 S EL PASO             35.12N 92.08W
04/21/2004  0.75 INCH        WHITE              AR   FIRE DEPT/RESCUE

&&

28

Local storm report, Apr 21, 8:32 PM CDT, 41 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LITTLE ROCK AR
832 PM CDT WED APR 21 2004

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

0742 PM     HAIL             6 N CABOT               35.06N 92.02W
04/21/2004  0.75 INCH        LONOKE             AR   FIRE DEPT/RESCUE

&&

28

Local storm report, Apr 21, 9:04 PM CDT, 9 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LITTLE ROCK AR
904 PM CDT WED APR 21 2004

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

0858 PM     HAIL             2 SE HUNT               35.51N 93.64W
04/21/2004  1.75 INCH        JOHNSON            AR   TRAINED SPOTTER

&&

28

The office that day

Everything else NWS Little Rock, AR issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 21, 7:16 PM CDT	Flash Flood Warning	LZK	Faulkner	3 hr
Apr 21, 7:17 PM CDT	Severe Thunderstorm Warning	LZK	Faulkner, Pulaski	43 min
Apr 21, 7:57 PM CDT	Severe Thunderstorm Warning	LZK	Lonoke, White	43 min
Apr 21, 8:19 PM CDT	Flash Flood Warning	LZK	White	116 min
Apr 21, 8:46 PM CDT	Severe Thunderstorm Warning	LZK	Johnson	29 min
Apr 21, 8:59 PM CDT	Severe Thunderstorm Warning	LZK	Prairie	31 min
Apr 21, 9:04 PM CDT	Severe Thunderstorm Warning	LZK	Lincoln	46 min
Apr 21, 10:23 PM CDT	Flash Flood Warning	LZK	Faulkner, White, Woodruff	3 hr
Apr 22, 12:12 AM CDT	Flash Flood Warning	LZK	Johnson	3 hr
Apr 22, 12:28 AM CDT	Flash Flood Warning	LZK	Conway, Pope	3 hr
Apr 22, 12:44 AM CDT	Flash Flood Warning	LZK	Logan	3 hr
Apr 22, 1:45 AM CDT	Severe Thunderstorm Warning	LZK	Yell	35 min
Apr 22, 2:45 AM CDT	Severe Thunderstorm Warning	LZK	Scott	30 min
Apr 22, 3:28 AM CDT	Flash Flood Warning	LZK	Scott, Yell	2 hr
Apr 22, 3:30 AM CDT	Flash Flood Warning	LZK	Conway, Perry	2 hr
Apr 22, 3:43 AM CDT	Severe Thunderstorm Warning	LZK	Yell	42 min
Apr 22, 5:54 AM CDT	Flash Flood Warning	LZK	Faulkner, Perry, White, Yell	2 hr
Apr 22, 6:09 AM CDT	Flash Flood Warning	LZK	Scott	111 min

Nearby

Severe Thunderstorm Warnings in Arkansas, 2004 Every severe thunderstorm warning in 2004

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.