Alert archive / Arkansas / Flash Flood Warnings in 2009

Flash Flood Warning 92, NWS Little Rock, AR

August 17, 2009Logan County, Arkansas

NWS Little Rock, AR issued this flash flood warning at Aug 17, 2009, 4:37 PM CDT for Logan County, Arkansas. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Aug 17, 2009, 4:37 PM CDT (21:37 UTC)
Expired
Aug 17, 2009, 7:30 PM CDT
In force
3 hr
Issued by
NWS Little Rock, AR
Area
Storm-based polygon
Flood severity
None

County Logan County, AR

The radar

The Western Arkansas radar (KSRX), 59 km from the middle of the area, began a volume at 21:37 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 12:00Z, 9.6 hours before the alert went out and 188 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-pSkew-T log-p diagram, Springfield, MO at 12:00Z on 2009-08-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1822 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Springfield, MO at 12:00Z on 2009-08-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 153 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1822 J/kg
Mixed-layer CIN
-54 J/kg
Mixed-layer LCL
771 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
153 m²/s²
0-3 km storm-relative helicity
175 m²/s²
Significant tornado parameter
0.0
Supercell composite
3.7

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood 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 flash flood warning went out at Aug 17, 2:25 PM CDT, 2 hours 12 minutes earlier.

Area forecast discussion, Aug 17, 2:25 PM CDT, 2 hours 12 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LITTLE ROCK AR
225 PM CDT MON AUG 17 2009

.DISCUSSION...
AREA OF CONVECTION...DUE TO OUTFLOW...OVER NORTHWEST AR GRADUALLY
MOVING SOUTHEAST AND HAVE UPDATED FORECAST TO UP POPS OVER
NORTHWEST PARTS OF THE CWA. SLIGHT CHANCES OF CONVECTION EXPECTED
OVER REST OF STATE THIS EVENING. STILL UNCERTAIN HOW FAR NW
CONVECTION WILL DRIFT SOUTHEAST...BUT EXPECT AT LEAST CHANCE TO
SLIGHT CHANCES OVER NORTHWEST PARTS. A PULSE STORM MAY BE SEEN
WITH MAIN THREATS HAIL AND WIND. AFTERNOON HEATING...AND IN PLACE
MOIST AND UNSTABLE ATMOSPHERE MAY BE FUELED BY CONVECTION.

OTHERWISE...AT THE SURFACE...STALLED FRONTAL BOUNDARY WELL NORTH
OVER KS TO NORTHERN MO...WHILE THE REMNANTS OF CLAUDETTE WELL TO
THE SOUTHWEST. THESE TWO FEATURES WILL HAVE A GREATER AFFECT ON
THE WEATHER OVER AR ON TUESDAY. UPPER SHORTWAVE MOVING ALONG THE
BOUNDARY AND HELPING DEVELOP CONVECTION.

&&

.SHORT TERM...TONIGHT THROUGH THURSDAY NIGHT
WILL NEED CHANCE POPS IN THE EVENING PERIOD OVER FAR NW AR...WHILE
SLIGHT CHANCE REST OF CWA. AFTER SUNSET...CONVECTION WILL
GRADUALLY DISSIPATE. KEPT A SLIGHT CHANCE GOING MUCH OF OVERNIGHT
WITH EXPECTED SHORT WAVE ENERGY MOVING IN THE UPPER FLOW...AND
SOME UNCERTAIN INFLUENCE OF THE REMNANTS OF CLAUDETTE. ON
TUESDAY...THE BOUNDARY EXPECTED TO SAG A BIT MORE SOUTH...WHILE
TROPICAL LOW PUSHING N TO NW TO NEAR WESTERN TN. IN PLACE
ATMOSPHERE REMAINS MOIST AND UNSTABLE...AND WITH SOME AFTERNOON
HEATING...CONVECTION WILL BE MORE WIDESPREAD. TUESDAY NIGHT...KEPT
CURRENT SLIGHT TO CHANCE POP WITH PROXIMITY OF SYSTEM NEAR
AR...WHILE SHORTWAVE ENERGY AGAIN MOVES THROUGH THE MEAN WEST TO
EAST FLOW OVER OK...MO AND PARTS OF AR. A BIT OF A LULL TUESDAY
NIGHT...BUT ON WEDNESDAY...AGAIN CHANCE POPS DUE TO SHORTWAVE
ENERGY AND THE APPROACHING FRONT. THE REMNANTS OF CLAUDETTE SHOULD
HAVE MOVED OUT OF THE AREA TO THE NORTHEAST. THURSDAY...A COLD
FRONT IS EXPECTED TO DRIFT INTO AR...AND GRADUALLY PUSHING INTO
AND TO THE SOUTH. CHANCE CONVECTION IS IN THE FORECAST. OVERALL
TEMPS AROUND NORMAL...A BIT LOWER IN AND AROUND CONVECTION.
OVERALL SEVERE STORM THREAT IS EXPECTED TO REMAIN LOW...WITH ONLY
ISOLATED STRONG TO SEVERE STORMS EXPECTED. COOLER LATE IN THE
WEEK BEHIND THE FRONT.

&&

.LONG TERM...FRIDAY THROUGH MONDAY
LARGE UPPER TROUGH/CLOSED LOW WILL BE OVER THE GREAT LAKES
REGION...AND WILL ALLOW COLD FRONT TO MOVE SOUTH OF THE STATE.
RAIN CHANCES WILL REMAIN IN THE FORECAST FOR FRIDAY...WITH DRY
WEATHER FOR THE REST OF THE FORECAST. NORTHWEST FLOW WILL BRING
COOLER AND DRIER AIR INTO THE STATE...WITH TEMPERATURES AT OR JUST
BELOW NORMAL. MODELS ARE HINTING AT ANOTHER FRONT LATE MONDAY INTO
TUESDAY...BUT DID NOT INCLUDE ANY PRECIP AT THIS TIME.

&&

.PRELIMINARY POINT TEMPS/POPS...
BATESVILLE AR     71  91  71  90 /  20  30  30  30
CAMDEN AR         72  92  72  93 /  20  30  30  30
HARRISON AR       70  88  69  89 /  30  30  30  30
HOT SPRINGS AR    71  93  71  93 /  20  30  30  30
LITTLE ROCK   AR  73  93  73  92 /  20  30  30  30
MONTICELLO AR     73  91  73  92 /  20  30  30  30
MOUNT IDA AR      71  93  71  93 /  20  30  30  30
MOUNTAIN HOME AR  70  89  69  89 /  30  30  30  30
NEWPORT AR        73  91  72  90 /  20  30  30  30
PINE BLUFF AR     73  92  73  92 /  20  30  30  30
RUSSELLVILLE AR   72  91  71  91 /  30  30  30  30
SEARCY AR         72  91  72  91 /  20  30  30  30
STUTTGART AR      74  92  73  92 /  20  30  30  30
&&

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

SHORT TERM...59 / LONG TERM...58
Hazardous weather outlook, Aug 17, 3:30 PM CDT, 1 hour 7 minutes before
HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE LITTLE ROCK AR
330 PM CDT MON AUG 17 2009

ARZ003>007-012>016-021>025-030>034-037>047-052>057-062>069-181000-
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-
330 PM CDT MON AUG 17 2009

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

.DAY ONE...TODAY AND TONIGHT

SHOWERS AND THUNDERSTORMS CONTINUE TO DEVELOP ACROSS THE STATE WITH
THE HIGHEST CONCENTRATION ACROSS THE NORTH. THE STORMS ACROSS THE
NORTH ARE DEVELOPING ALONG AN OUTFLOW BOUNDARY FROM PREVIOUS STORMS
THAT DEVELOPED LAST NIGHT OVER THE CENTRAL PLAINS. THE STORMS
ELSEWHERE ARE DEVELOPING IN A MOIST AND UNSTABLE ATMOSPHERE...AIDED
BY THE HEAT OF THE DAY.

SOME STORMS COULD BECOME STRONG...POSSIBLY SEVERE WITH THE BEST
CHANCES OVER THE NORTH. HOWEVER...NO WIDESPREAD SEVERE WEATHER IS
EXPECTED AT THIS TIME. THE MAIN THREATS WITH THE STRONGEST STORMS
WILL BE HAIL AND HIGH WINDS. LOCALIZED FLASH FLOODING WILL ALSO BE
POSSIBLE AS ANY THUNDERSTORMS THAT DO DEVELOP WILL BE SLOW MOVING.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

SOUTHERLY FLOW WILL CONTINUE TO BRING INCREASING MOISTURE TO
ARKANSAS AND A CHANCE OF MOSTLY AFTERNOON AND EVENING SHOWERS AND
THUNDERSTORMS... THROUGH MUCH OF THE WORK WEEK. THE CHANCE FOR RAIN
WILL INCREASE AS A COLD FRONT STALLS IN MISSOURI...AND SEVERAL UPPER
LEVEL WEATHER SYSTEMS MOVE THROUGH THE AREA. THE FRONT SHOULD MOVE
THROUGH ARKANSAS FRIDAY...BRINGING INCREASED CHANCES FOR SHOWERS AND
THUNDERSTORMS FRIDAY AFTERNOON...WITH POTENTIAL FOR SOME SEVERE
THUNDERSTORMS RETURNING. DRY WEATHER WILL RETURN THIS COMING WEEKEND
AS THE COLD FRONT PUSHES SOUTH INTO THE GULF OF MEXICO...WITH
RELATIVELY COOLER AND DRIER AIR CONTINUING TO FILTER IN FROM THE
NORTH.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED AT THIS TIME.

&&

VISIT NWS LITTLE ROCK ON THE WEB. GO TO HTTP://WEATHER.GOV AND
CLICK ON CENTRAL ARKANSAS.

62

In the hours before

Special weather statement, Aug 17, 2:36 PM CDT, 2 hours 1 minute before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE LITTLE ROCK AR
236 PM CDT MON AUG 17 2009

ARZ003-172035-
BOONE-
236 PM CDT MON AUG 17 2009

...SIGNIFICANT WEATHER ALERT FOR BOONE COUNTY UNTIL 335 PM CDT...

AT 235 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 8 MILES SOUTHWEST OF OMAHA...MOVING EAST AT 10
MPH.

SMALL HAIL...WIND GUSTS UP TO 35 MPH...DANGEROUS LIGHTNING AND HEAVY
RAIN ARE EXPECTED WITH THIS STORM.

FREQUENT...DANGEROUS LIGHTNING IS OCCURRING WITH THIS STORM. IF
OUTDOORS...STAY AWAY FROM ISOLATED HIGH OBJECTS SUCH AS TREES. MOVE
INDOORS IF POSSIBLE. WHEN INDOORS...STAY AWAY FROM WINDOWS AND DOORS
AND AVOID USING TELEPHONES UNLESS IT IS AN EMERGENCY.

IF ON OR NEAR BULL SHOALS...GET OUT OF THE WATER AND MOVE INDOORS OR
INSIDE A VEHICLE. REMEMBER...LIGHTNING CAN STRIKE OUT TO 15 MILES
FROM THE PARENT THUNDERSTORM. IF YOU CAN HEAR THUNDER...YOU ARE
CLOSE ENOUGH TO BE STRUCK BY LIGHTNING. MOVE TO SAFE SHELTER NOW.
DONT BE CAUGHT ON THE WATER IN A THUNDERSTORM

59
Special weather statement, Aug 17, 3:23 PM CDT, 1 hour 14 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE LITTLE ROCK AR
323 PM CDT MON AUG 17 2009

ARZ003-012-172055-
BOONE-NEWTON-
323 PM CDT MON AUG 17 2009

...SIGNIFICANT WEATHER ALERT FOR BOONE AND NEWTON COUNTIES UNTIL 355
PM CDT...

AT 323 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM NEAR LOST VALLEY STATE PARK...MOVING EAST AT 10
MPH.

WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS STORM.

AREAS THAT WILL BE AFFECTED INCLUDE JASPER.

FREQUENT...DANGEROUS LIGHTNING IS OCCURRING WITH THIS STORM. IF
OUTDOORS...STAY AWAY FROM ISOLATED HIGH OBJECTS SUCH AS TREES. MOVE
INDOORS IF POSSIBLE. WHEN INDOORS...STAY AWAY FROM WINDOWS AND DOORS
AND AVOID USING TELEPHONES UNLESS IT IS AN EMERGENCY.

56
Special weather statement, Aug 17, 3:50 PM CDT, 47 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Aug 17, 4:06 PM CDTSevere Thunderstorm WarningLZKLogan, Yell39 min
Aug 17, 4:23 PM CDTFlash Flood WarningLZKBoone3 hr
Aug 17, 6:12 PM CDTSevere Thunderstorm WarningLZKVan Buren23 min

Nearby

Flash Flood Warnings in Arkansas, 2009Every flash flood 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.