Alert archive / Tennessee / Flash Flood Warnings in 2009

Flash Flood Warning 215, NWS Memphis, TN

September 24, 2009Madison County, Tennessee

NWS Memphis, TN issued this flash flood warning at Sep 24, 2009, 4:56 PM CDT for Madison County, Tennessee. It was in force for 2 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: Sep 24, 2009, 4:56 PM CDT (21:56 UTC)
Expired: Sep 24, 2009, 7:00 PM CDT
In force: 2 hr
Issued by: NWS Memphis, TN
Area: Storm-based polygon
Flood severity: None

County Madison County, TN

The radar

The Memphis radar (KNQA), 98 km from the middle of the area, began a volume at 21:56 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

Little Rock, AR (KLZK), launched 12:00Z, 9.9 hours before the alert went out and 133 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 564 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: -43 m²/s²
0-3 km storm-relative helicity: 101 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 warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Memphis, TN wrote its last area forecast discussion before this flash flood warning went out at Sep 24, 2:53 PM CDT, 2 hours 3 minutes earlier.

Area forecast discussion, Sep 24, 2:53 PM CDT, 2 hours 3 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MEMPHIS TN
253 PM CDT THU SEP 24 2009

.DISCUSSION...

NEARLY STATIONARY FRONT IS JUST EAST OF THE MISSISSIPPI RIVER THIS
AFTERNOON WITH TEMPERATURES IN THE LOWER 70S TO LOWER 80S.
SCATTERED SHOWERS CONTINUE TO MOVE ACROSS MUCH OF THE FORECAST
AREA THIS AFTERNOON. UPPER LOW REMAINS CLOSE TO THE WESTERN EDGE
OF THE KANSAS/NEBRASKA BORDER. THE FRONT WILL MOVE ONLY A LITTLE
FURTHER EAST TONIGHT AND WILL CONTINUE TO PROVIDE A FOCUS FOR
SCATTERED SHOWERS AND THUNDERSTORMS. FRIDAY SHOULD BE A LOT LIKE
TODAY WITH THE FRONT A LITTLE FURTHER EAST AND WEAKENING. THE
RESULT WILL BE MORE SHOWERS AND THUNDERSTORMS. BY FRIDAY
NIGHT...THE UPPER LOW FINALLY MOVES OUT OF THE CENTRAL PLAINS AND
INTO WESTERN AND CENTRAL IOWA. THIS WILL KEEP A CHANCE OF RAIN
OVER THE FORECAST AREA BUT AN END TO THE RAIN IS IN SIGHT. BY
SATURDAY...THE UPPER LOW WEAKENS FURTHER AND BECOMES MORE OF A
TROUGH AS IT MOVES INTO THE GREAT LAKES AREA. THIS WILL MEAN A
SMALL CHANCE OF RAIN FOR SATURDAY MORNING BUT MUCH OF THE RAIN
SHOULD BE GONE BY AFTERNOON. WEAK HIGH PRESSURE WILL BUILD INTO
THE REGION SATURDAY NIGHT BRINGING AN END TO THE VERY WET COUPLE
OF WEEKS. A COLD FRONT WILL APPROACH THE FORECAST AREA ON SUNDAY
BUT THE FRONT SHOULD BE DRY. THE COLD FRONT SHOULD MOVE THROUGH
THE FORECAST AREA ON MONDAY WITH LITTLE IF ANY RAIN EXPECTED AHEAD
OF THE FRONT. BY MONDAY NIGHT...COOLER AND MUCH DRIER AIR WILL
BEGIN TO FILTER INTO THE FORECAST. THIS COOLER AND DRIER AIR WILL
KEEP THINGS RAIN FALL FROM MONDAY NIGHT THROUGH THURSDAY WITH
TEMPERATURES REMAINING BELOW NORMAL.

ARS

&&

AVIATION...
18Z TAFS

LATEST KNQA RADAR DATA SHOWS A SURFACE TROF ABOUT 25NM EAST OF
KMEM... MOVING EAST. ALTHOUGH RAIN SHOWERS CANNOT BE RULED OUT
ANYWHERE THIS AFTERNOON...BETTER CHANCES FOR IFR CIGS AND
RAINSHOWERS TO BE EAST OF THE SURFACE TROF.

WITH EXTENSIVE LATE AFTERNOON AND EVENING IFR/MVFR CIGS... HAVE
BUMPED UP OVERNIGHT VSBYS IN THE 18Z TAF PACKAGE. GFS LAMP
GUIDANCE AND NAM MODEL HUMIDITY PROGS STILL SUGGEST IFR /
OCNL VLIFR CIGS TOWARD 12Z. GIVEN THE PERSISTENCE OF THE GULF
AIRMASS...SEE LITTLE REASON TO DISAGREE.

BEYOND THE TAF PERIOD...DRIER AIR EDGING INTO AR FRIDAY AFTERNOON
MAY RESULT IN VFR CIGS AT KJBR AND PERHAPS KMEM.

PWB

&&

.PRELIMINARY POINT TEMPS/POPS...
MEM  67  82  66  82 /  40  40  40  40
MKL  65  81  61  79 /  40  40  40  40
JBR  64  79  58  81 /  40  40  40  40
TUP  68  84  67  82 /  40  40  40  40

&&

.MEG WATCHES/WARNINGS/ADVISORIES...
AR...NONE.
MO...NONE.
MS...NONE.
TN...NONE.
&&

Hazardous weather outlook, Sep 24, 3:35 PM CDT, 1 hour 21 minutes before

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In the hours before

Local storm report, Sep 24, 4:24 PM CDT, 32 minutes before

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE MEMPHIS TN
424 PM CDT THU SEP 24 2009

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

0615 PM     FLASH FLOOD      14 ESE ABERDEEN         33.75N 88.33W
09/23/2009                   MONROE             MS   LAW ENFORCEMENT

            WOLFE ROAD FLOODED FROM HEAVY RAINFALL. KGWX ESTIMATED
            AROUND 3 INCHES IN JUST OVER ONE HOUR.

0800 PM     FLASH FLOOD      6 WNW WALNUT            34.98N 89.00W
09/23/2009                   TIPPAH             MS   POST OFFICE

            HIGHWAY DEPARTMENT FIXED ROADS DAMAGED FROM EXCESSIVE
            HEAVY RAINFALL AND FLOODING NORTH OF HIGHWAY 72 NEAR THE
            TIPPAH AND BENTON COUNTY LINE.

1000 PM     FLASH FLOOD      8 SE GLENDORA           33.75N 90.19W
09/23/2009                   TALLAHATCHIE       MS   POST OFFICE

            EXCESSIVE WATER GREATER THAN 6 INCHES ON SEVERAL ROADS
            NEAR PHILIPP DUE TO HEAVY RAINFALL.

&&

MBS

The office that day

Everything else NWS Memphis, TN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 23, 7:35 PM CDT	Flash Flood Warning	MEG	Benton, Tippah	113 min
Sep 23, 8:52 PM CDT	Flash Flood Warning	MEG	Tallahatchie	3 hr
Sep 24, 5:17 PM CDT	Flash Flood Warning	MEG	Calhoun, Chickasaw	3 hr

Nearby

Flash Flood Warnings in Tennessee, 2009 Every 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.