Alert archive / Mississippi / Flash Flood Warnings in 2008

Flash Flood Warning 108, NWS Memphis, TN

June 12, 2008Calhoun County, Mississippi

NWS Memphis, TN issued this flash flood warning at Jun 12, 2008, 3:45 PM CDT for Calhoun County, Mississippi. 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
Jun 12, 2008, 3:45 PM CDT (20:45 UTC)
Expired
Jun 12, 2008, 5:45 PM CDT
In force
2 hr
Issued by
NWS Memphis, TN
Area
Storm-based polygon
Flood severity
None

County Calhoun County, MS

The radar

The Columbus AFB radar (KGWX), 93 km from the middle of the area, began a volume at 20:45 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

Birmingham, AL (KBMX), launched 12:00Z, 8.8 hours before the alert went out and 251 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, Birmingham, AL at 12:00Z on 2008-06-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1105 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, Birmingham, AL at 12:00Z on 2008-06-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -35 square meters per square second.1939Sfc1 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
1105 J/kg
Mixed-layer CIN
-51 J/kg
Mixed-layer LCL
764 m above ground
0-6 km bulk shear
7 kt
0-1 km storm-relative helicity
-35 m²/s²
0-3 km storm-relative helicity
-35 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 Jun 12, 12:01 PM CDT, 3 hours 44 minutes earlier.

Area forecast discussion, Jun 12, 12:01 PM CDT, 3 hours 44 minutes before
AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE MEMPHIS TN
1201 PM CDT THU JUN 12 2008

.UPDATE...

UPDATED TO EXPAND THE MENTION OF ISOLATED TO SCATTERED
THUNDERSTORMS ACROSS ALL OF WEST TN...NORTH MS INTO PART OF EAST-
CENTRAL AR BASED ON CURRENT RADAR TRENDS. A FEW STORMS MAY BECOME
STRONG TO SEVERE WITH DAMAGING WINDS BEING THE MAIN THREAT.
MARGINALLY SEVERE HAIL IS ALSO POSSIBLE ALTHOUGH A FREEZING LEVEL
NEAR 15000 FT AND A WET BULB ZERO NEAR 13000 FT SHOULD REDUCE THE
HAIL THREAT.

JCL

&&

.PREV DISCUSSION... /ISSUED 1013 AM CDT THU JUN 12 2008/

UPDATE...

A STRONG H5 RIDGE OF 5900 M WAS CENTERED ALONG THE NC COAST AND
STRETCHED WESTWARD ACROSS THE MID-SOUTH. THIS RIDGE WILL ONCE
AGAIN SUPPRESS MOST CONVECTION ACROSS THE AREA. WATER VAPOR
IMAGERY DOES SHOW AN INCREASE IN MID AND HIGH LEVEL MOISTURE
SPREADING INTO NORTHEAST MS FROM THE SOUTHEAST. EXPANDED THE
SLIGHT CHANCE OF THUNDERSTORMS A LITTLE TO INCLUDE THE SOUTHEAST
CORNER OF WEST TN ALONG WITH MUCH OF NORTHEAST MS. TEMPERATURES
ARE EXPECTED TO ONCE AGAIN CLIMB TO ABOUT 5 DEGREES ABOVE NORMAL
ACROSS MUCH OF THE MID-SOUTH THIS AFTERNOON...REACHING INTO THE
LOWER 90S OVER MOST OF THE AREA. SURFACE DEWPOINTS HAVE INCREASED
A LITTLE SINCE YESTERDAY...AND WILL BE IN THE UPPER 60S TO AROUND
70 THIS AFTERNOON...MAKING FOR MORE HOT CONDITIONS TODAY. SKIES
WILL BE PARTLY CLOUDY THIS AFTERNOON WITH SCATTERED TO BROKEN
CUMULUS DEVELOPMENT. HAVE ALREADY MADE THE APPROPRIATE CHANGES
TO THE GRIDS AND UPDATED THE ZONES.

JCL

PREV DISCUSSION... /ISSUED 250 AM CDT THU JUN 12 2008/

DISCUSSION...

SKIES ARE CLEAR ACROSS THE FORECAST AREA EARLY THIS MORNING WITH
TEMPERATURES MAINLY IN THE 70S. COLD FRONT REMAINS WEST OF THE
REGION EXTENDING FROM CENTRAL MINNESOTA THROUGH NORTHEAST KANSAS
AND INTO THE TEXAS PANHANDLE. WITH COLD FRONT FAR ENOUGH TO OUR
WEST DO NOT SEE MUCH IN THE WAY OF THUNDERSTORM DEVELOPMENT TODAY.
SOME ISOLATED THUNDERSTORMS WILL BE POSSIBLE OVER NORTHEAST
MISSISSIPPI WITH DAYTIME HEATING AND WHERE CONDITIONS ARE A LITTLE
MORE UNSTABLE. TONIGHT SHOULD REMAIN DRY AS COLD FRONT DOES INCH
CLOSER TO THE FORECAST AREA BUT NOT CLOSE ENOUGH TO TRIGGER ANY
THUNDERSTORMS. BY FRIDAY...THE COLD FRONT SHOULD BE CLOSE ENOUGH
TO PRODUCE SOME SCATTERED THUNDERSTORMS OVER THE FORECAST AREA.
THERE IS A SMALL CHANCE FOR SEVERE WEATHER OVER THE NORTHERN PART
OF THE FORECAST AREA DURING THE DAY ON FRIDAY WITH THE MAIN THREAT
BEING LARGE HAIL AND DAMAGING WINDS. THE COLD FRONT MOVES SLOWLY
AND WEAKENS THROUGH THE FORECAST AREA ON FRIDAY NIGHT AND SATURDAY
SO THERE WILL BE A CONTINUED CHANCE OF THUNDERSTORMS. BY SATURDAY
NIGHT...THE FRONT WEAKENS AND MOVES OUT OF THE REGION WITH THE
RISK OF THUNDERSTORMS ENDING. HIGH PRESSURE BUILDS INTO THE REGION
BY SUNDAY BRINGING DRY WEATHER FOR SUNDAY AND SUNDAY NIGHT.
ANOTHER WEAK COLD FRONT MOVES TOWARD THE REGION BY MONDAY AND INTO
THE FORECAST AREA FOR MONDAY NIGHT AND TUESDAY SO THERE WILL
ANOTHER CHANCE FOR THUNDERSTORMS. HIGH PRESSURE BUILDS BACK INTO
THE REGION BY TUESDAY NIGHT SO DRY WEATHER RETURNS FOR TUESDAY
NIGHT AND WEDNESDAY.

&&

.PRELIMINARY POINT TEMPS/POPS...
MEM  75  91  73  88 /  10  30  40  40
MKL  72  88  70  85 /  10  30  50  40
JBR  73  92  70  88 /  10  30  50  40
TUP  72  90  71  87 /  10  30  30  40

&&

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

In the hours before

Special weather statement, Jun 12, 2:44 PM CDT, 1 hour 1 minute before
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Special weather statement, Jun 12, 3:21 PM CDT, 24 minutes before
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Local storm report, Jun 12, 3:42 PM CDT, 3 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jun 12, 2:53 PM CDTSevere Thunderstorm WarningMEGDeSoto18 min
Jun 12, 3:50 PM CDTFlash Flood WarningMEGHardeman115 min

Nearby

Flash Flood Warnings in Mississippi, 2008Every flash flood warning in 2008

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.