Alert archive / Arkansas / Flash Flood Watches in 2011

Flash Flood Watch 7, NWS Little Rock, AR

September 18, 2011Baxter County, Fulton County, Marion County, Arkansas

NWS Little Rock, AR issued this flash flood watch at Sep 18, 2011, 11:58 AM CDT for Baxter County, Fulton County, Marion County, Arkansas. It took effect at Sep 18, 2011, 1:00 PM CDT. It was in force for 12 hr.

The area

The counties it named.

The facts

Issued
Sep 18, 2011, 11:58 AM CDT (16:58 UTC)
In effect from
Sep 18, 2011, 1:00 PM CDT
Expired
Sep 19, 2011, 1:00 AM CDT
In force
12 hr
Issued by
NWS Little Rock, AR
Flood severity
None

Counties Baxter County, AR, Fulton County, AR, Marion County, AR

The radar

The Springfield radar (KSGF), 143 km from the middle of the area, began a volume at 17:02 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, 5.0 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-pSkew-T log-p diagram, Springfield, MO at 12:00Z on 2011-09-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 2011-09-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 228 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1001 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
228 m²/s²
0-3 km storm-relative helicity
350 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 flash flood watch 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 watch went out at Sep 18, 6:44 AM CDT, 5 hours 14 minutes earlier.

Area forecast discussion, Sep 18, 6:44 AM CDT, 5 hours 14 minutes before
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Hazardous weather outlook, Sep 18, 10:15 AM CDT, 1 hour 43 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LITTLE ROCK AR
1015 AM CDT SUN SEP 18 2011

ARZ003>007-012>016-021>025-030>034-037>047-052>057-062>069-191000-
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-
1015 AM CDT SUN SEP 18 2011

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

.DAY ONE...TODAY AND TONIGHT

A SLOW-MOVING FRONTAL BOUNDARY WILL MEANDER AROUND ARKANSAS TODAY
AND TONIGHT. AT THE SAME TIME...ABUNDANT LOW LEVEL MOISTURE WILL
CONTINUE TO MOVE ACROSS AND INTERACT WITH THE SYSTEM...AS SEVERAL
UPPER LEVEL WAVES MOVE THROUGH. THE RESULT WILL BE SCATTERED TO
NUMEROUS SHOWERS AND THUNDERSTORMS TODAY AND TONIGHT.

SOME STORMS THAT DEVELOP DURING THE AFTERNOON COULD BECOME STRONG TO
BRIEFLY SEVERE. IF ANY STORM WERE TO BECOME STRONG TO SEVERE...WIND
GUSTS OF 60 MPH WOULD BE POSSIBLE...ALONG WITH HAIL TO QUARTER SIZE.
THE GREATEST THREAT FOR STRONG STORMS WOULD BE IN THE AFTERNOON AND
EARLY EVENING HOURS...AND GENERALLY OVER NORTHWEST AND WEST CENTRAL
ARKANSAS...NORTH OF A LINE FROM MENA TO HARRISON.

STRONGER STORMS WILL BE CAPABLE OF PRODUCING HEAVY RAINFALL. IN
AREAS OF WESTERN AND NORTHERN ARKANSAS...MANY LOCATIONS HAVE
RECEIVED ANYWHERE FROM TWO TO FIVE INCHES OF RAINFALL SINCE
SATURDAY. ADDITIONAL RAINFALL OF ONE TO TWO INCHES COULD OCCUR
THROUGH TONIGHT...WHICH WILL INCREASE FLASH FLOOD POTENTIAL. THE
AREA OF GREATEST CONCERN FOR FLASH FLOOD POTENTIAL WILL BE FROM THE
WESTERN ARKANSAS RIVER VALLEY TO NORTH CENTRAL ARKANSAS...OR MORE
SPECIFICALLY WEST OF A LINE FROM CLARKSVILLE...TO GILBERT...TO
SALEM.

HEAVY RAINFALL COULD RESULT IN LOCALIZED AREAS OF FLASH FLOODING IN
SOUTHWEST AND WESTERN ARKANSAS. RAINFALL OF ONE TO TWO INCHES WILL
BE POSSIBLE IN AREAS SOUTH OF A LINE FROM MENA TO CLARKSVILLE...
AND GENERALLY WEST OF THE INTERSTATE 30 CORRIDOR.

A COLD FRONT WILL PUSH INTO ARKANSAS TONIGHT...AND TRAVERSE THE
STATE LATE TONIGHT THROUGH EARLY MONDAY.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

THE COLD FRONT WILL MOVE OUT OF ARKANSAS MONDAY AFTERNOON...WITH
RAIN CHANCES COMING TO AN END. HOWEVER...AN UNSETTLED WEATHER
PATTERN WILL CONTINUE.

ANOTHER COLD FRONT WILL MOVE THROUGH ON WEDNESDAY WITH ADDITIONAL
CHANCES OF SHOWERS AND THUNDERSTORMS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT EXPECTED.

&&

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

51/57

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 18, 5:16 PM CDTSevere Thunderstorm WarningLZKLogan, Scott29 min
Sep 18, 6:27 PM CDTSevere Thunderstorm WarningLZKLogan, Scott48 min

Nearby

Flash Flood Watches in Arkansas, 2011Every flash flood watch in 2011

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.