Alert archive / Louisiana / Flash Flood Watches in 2015

Flash Flood Watch 1, NWS Lake Charles, LA

March 9, 201510 parishes in Louisiana; 4 counties in Texas

NWS Lake Charles, LA issued this flash flood watch at Mar 9, 2015, 3:00 PM CDT for 10 parishes in Louisiana; 4 counties in Texas. It took effect at Mar 9, 2015, 7:00 PM CDT. It was in force for 34 hr.

The area

The counties it named.

The facts

Issued
Mar 9, 2015, 3:00 PM CDT (20:00 UTC)
In effect from
Mar 9, 2015, 7:00 PM CDT
Expired
Mar 11, 2015, 4:48 AM CDT
In force
34 hr
Issued by
NWS Lake Charles, LA
Flood severity
None

Counties Allen Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Cameron Parish, LA, Evangeline Parish, LA, Lafayette Parish, LA, Rapides Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA, Vernon Parish, LA, Hardin County, TX, Jasper County, TX, Newton County, TX, Tyler County, TX

The radar

The Ft Polk radar (KPOE), 58 km from the middle of the area, began a volume at 20:00 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

Shreveport, LA (KBAD), launched 12:00Z, 8.0 hours before the alert went out and 218 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, Shreveport, LA at 12:00Z on 2015-03-09Temperature 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, Shreveport, LA at 12:00Z on 2015-03-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 205 square meters per square second.1939587897Sfc1 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
443 m above ground
0-6 km bulk shear
40 kt
0-1 km storm-relative helicity
205 m²/s²
0-3 km storm-relative helicity
219 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 Lake Charles, LA wrote its last area forecast discussion before this flash flood watch went out at Mar 9, 12:53 PM CDT, 2 hours 7 minutes earlier.

Area forecast discussion, Mar 9, 12:53 PM CDT, 2 hours 7 minutes before
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Hazardous weather outlook, Mar 9, 6:02 AM CDT, 8 hours 58 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LAKE CHARLES LA
602 AM CDT MON MAR 9 2015

LAZ027>033-041>045-052>055-073-074-TXZ180-201-215-216-259>262-
101115-
VERNON-RAPIDES-AVOYELLES-BEAUREGARD-ALLEN-EVANGELINE-ST. LANDRY-
CALCASIEU-JEFFERSON DAVIS-ACADIA-LAFAYETTE-UPPER ST. MARTIN-
VERMILION-IBERIA-ST. MARY-LOWER ST. MARTIN-WEST CAMERON-
EAST CAMERON-TYLER-HARDIN-JEFFERSON-ORANGE-NORTHERN JASPER-
NORTHERN NEWTON-SOUTHERN JASPER-SOUTHERN NEWTON-
602 AM CDT MON MAR 9 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF CENTRAL
LOUISIANA...SOUTH CENTRAL LOUISIANA...SOUTHWEST LOUISIANA...WEST
CENTRAL LOUISIANA AND SOUTHEAST TEXAS.

.DAY ONE...TODAY AND TONIGHT
AN UPPER LEVEL DISTURBANCE COMBINED WITH A DEVELOPING AREA OF
SURFACE LOW PRESSURE OVER SOUTHEAST TEXAS WILL PRODUCE WIDESPREAD
SHOWERS AND ISOLATED THUNDERSTORMS ACROSS MUCH OF THE AREA TODAY.
THE HEAVIEST RAINFALL IS EXPECTED ACROSS INTERIOR SOUTHEAST
TEXAS...MAINLY NORTHWEST OF A SOUR LAKE TO NEWTON LINE...WHERE
RAINFALL TOTALS OF ONE TO TWO INCHES IS EXPECTED. WIDESPREAD OR
SIGNIFICANT FLOODING IS NOT EXPECTED AT THIS TIME...BUT SOME
LOCALIZED FLOODING WILL BE POSSIBLE ESPECIALLY IN LOW LYING AND
URBAN AREAS.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY
PERIODS OF LIGHT TO MODERATE RAIN WILL CONTINUE THROUGH THURSDAY
AS THE SURFACE LOW MOVES NORTHEAST AND BRINGS A WEAK COLD FRONT
THROUGH THE AREA. THE FRONT WILL BECOME STALLED ACROSS SOUTHEAST
LOUISIANA AND THE NORTH CENTRAL GULF...WHILE AN UPPER TROUGH
REMAINS WEST OF THE REGION...AIDING IN THE CONTINUED CHANCE FOR
RAIN. AN ADDITIONAL ONE TO THREE INCHES OF RAIN CAN BE EXPECTED
DURING THIS TIME...WITH THE HIGHEST RAINFALL TOTALS EXPECTED
ACROSS THE ACADIANA REGION. THESE RAINFALL TOTALS COULD LEAD TO
SOME FLOODING PROBLEMS ACROSS PORTIONS OF THE AREA...ESPECIALLY IF
HEAVY TRAINING BANDS DEVELOP...AND A FLASH FLOOD WATCH MAY BECOME
NECESSARY LATER TODAY OR TONIGHT.

RAIN CHANCES WILL BEGIN TO DIMINISH BY FRIDAY WITH LOW CHANCES
EXPECTED THROUGH THE WEEKEND.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION IS NOT ANTICIPATED AT THIS TIME.

GMZ430-432-435-450-452-455-470-472-475-101115-
SABINE LAKE-CALCASIEU LAKE-VERMILION BAY-
COASTAL WATERS FROM CAMERON LA TO HIGH ISLAND TX OUT 20 NM-
COASTAL WATERS FROM INTRACOASTAL CITY TO CAMERON LA OUT 20 NM-
COASTAL WATERS FROM LOWER ATCHAFALAYA RIVER TO INTRACOASTAL CITY
LA OUT 20 NM-
WATERS FROM CAMERON LA TO HIGH ISLAND TX FROM 20 TO 60 NM-
WATERS FROM  INTRACOASTAL CITY TO CAMERON LA FROM 20 TO 60 NM-
WATERS FROM LOWER ATCHAFALAYA RIVER TO INTRACOASTAL CITY LA FROM
20 TO 60 NM-
602 AM CDT MON MAR 9 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF THE NORTHWEST
GULF OF MEXICO.

.DAY ONE...TODAY AND TONIGHT
SHOWER CHANCES WILL INCREASE THROUGH TONIGHT AS A SURFACE LOW
DEVELOPS ACROSS SOUTHEAST TEXAS.

OTHERWISE...NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY
WIDESPREAD SHOWERS AND ISOLATED THUNDERSTORMS CAN BE EXPECTED
TUESDAY...WITH SHOWERS REMAINING LIKELY THROUGH THURSDAY AS A WEAK
COLD FRONT CROSSES THE COASTAL WATERS AND BECOMES STALLED OVER THE
NORTH CENTRAL GULF. MODERATE EAST TO SOUTHEAST WINDS WILL SHIFT TO
THE NORTHWEST LATE TUESDAY IN THE WAKE OF THE FRONT...WITH
MODERATE OFFSHORE FLOW EXPECTED THROUGH THE REMAINDER OF THE WEEK.
SOME STORMS WILL BE CAPABLE OF PRODUCING HEAVY RAINFALL THAT COULD
REDUCE VISIBILITIES AND OCCASIONAL CLOUD TO WATER LIGHTNING.

RAIN CHANCES WILL BEGIN TO DIMINISH BY FRIDAY WITH LOW CHANCES
EXPECTED THROUGH THE WEEKEND.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION WILL NOT BE NEEDED.

24

The office that day

Everything else NWS Lake Charles, LA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Mar 8, 8:55 PM CDTRiver Flood WarningLCHBeauregard, Calcasieu8 days
Mar 9, 10:58 AM CDTRiver Flood WatchLCHAllen14 days
Mar 9, 10:58 AM CDTRiver Flood WatchLCHAllen5 days
Mar 9, 10:58 AM CDTRiver Flood WatchLCH9 days
Mar 9, 1:10 PM CDTMarine Dense Fog AdvisoryLCH30 hr
Mar 9, 10:58 AM CDTRiver Flood WatchLCHHardin3 days

Nearby

Flash Flood Watches in Louisiana, 2015Flash Flood Watches in Texas, 2015Every flash flood watch in 2015

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.