Alert archive / Louisiana / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 32, NWS Lake Charles, LA

March 21, 2012Iberia Parish, Saint Martin Parish, St. Mary Parish, Louisiana

NWS Lake Charles, LA issued this severe thunderstorm warning at Mar 21, 2012, 7:20 AM CDT for Iberia Parish, Saint Martin Parish, St. Mary Parish, Louisiana. It was in force for 39 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Mar 21, 2012, 7:20 AM CDT (12:20 UTC)
Expired: Mar 21, 2012, 7:59 AM CDT
In force: 39 min
Issued by: NWS Lake Charles, LA
Area: Storm-based polygon

Counties Iberia Parish, LA, Saint Martin Parish, LA, St. Mary Parish, LA

What was reported inside it

Time	Report	Where	Remark
Mar 21, 7:57 AM CDT	TORNADO 0	Patterson, LA	NWS STORM SURVEY CONFIRMED AN EF0 TORNADO WITH A PATH ONE MILE LONG AND FORTY YARDS WIDE. A FEW TREES HAD LIMBS SNAPPED OFF. A LARGE INDUSTRIAL BUILDING HAD ITS GARAGE DOOR BLOWN IN. SHEETING WAS PULLED OFF OF A DIFFERENT BUILDING. SHEET METAL FROM AN INDUSTRI

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Mar 21, 5:04 AM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 0.3 hours before the alert went out and 170 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: 983 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 519 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 363 m²/s²
0-3 km storm-relative helicity: 421 m²/s²
Significant tornado parameter: 1.7
Supercell composite: 10.7

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

968 
WUUS54 KLCH 211220
SVRLCH
LAC045-099-101-211315-
/O.NEW.KLCH.SV.W.0032.120321T1220Z-120321T1315Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE LAKE CHARLES LA
720 AM CDT WED MAR 21 2012

THE NATIONAL WEATHER SERVICE IN LAKE CHARLES HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHEASTERN IBERIA PARISH IN SOUTH CENTRAL LOUISIANA...
  SOUTHEASTERN ST. MARTIN PARISH IN SOUTH CENTRAL LOUISIANA...
  THIS INCLUDES STEPHENSVILLE...
  NORTHERN ST. MARY PARISH IN SOUTH CENTRAL LOUISIANA...
  THIS INCLUDES...PATTERSON...MORGAN CITY...FRANKLIN...BERWICK...
  BAYOU VISTA...

* UNTIL 815 AM CDT

* AT 719 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  LINE OF SEVERE THUNDERSTORMS...CAPABLE OF PRODUCING QUARTER SIZE
  HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH...FROM 8 MILES
  NORTHWEST OF FRANKLIN TO 10 MILES SOUTHWEST OF FRANKLIN...MOVING
  NORTHEAST AT 35 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  BALDWIN...CHARENTON...ELLERSLIE AND PATTERSON MEMORIAL AIRPORT

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS IN EXCESS OF 60 MPH...
DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND HEAVY RAIN. STAY INDOORS...
AWAY FROM WINDOWS.

A TORNADO WATCH REMAINS IN EFFECT UNTIL NOON CDT WEDNESDAY FOR
SOUTHWESTERN LOUISIANA.

&&

PLEASE REPORT SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE AT
337-477-5285 EXTENSION 1.

LAT...LON 2966 9110 2962 9166 2963 9167 2966 9164
      2973 9163 2974 9170 2985 9171 3006 9147
      3006 9127 3002 9122 2998 9125 2986 9120
      2984 9113 2981 9110
TIME...MOT...LOC 1219Z 246DEG 31KT 2987 9160 2979 9156
          2969 9159

$$

23

1 follow-up statement

567 
WWUS54 KLCH 211259
SVSLCH

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LAKE CHARLES LA
759 AM CDT WED MAR 21 2012

LAC045-099-101-211309-
/O.CAN.KLCH.SV.W.0032.000000T0000Z-120321T1315Z/
ST. MARY LA-IBERIA LA-ST. MARTIN LA-
759 AM CDT WED MAR 21 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN ST. MARTIN...
NORTHEASTERN IBERIA AND NORTHERN ST. MARY PARISHES IS CANCELLED...

A TORNADO WATCH REMAINS IN EFFECT UNTIL NOON CDT WEDNESDAY FOR
SOUTHWESTERN LOUISIANA.

LAT...LON 2966 9110 2962 9166 2963 9167 2966 9164
      2973 9163 2974 9170 2985 9171 3006 9147
      3006 9127 3002 9122 2998 9125 2986 9120
      2984 9113 2981 9110
TIME...MOT...LOC 1259Z 246DEG 31KT 3001 9124 2993 9120
          2983 9123

$$

JT

What forecasters said that day

The local office's own words before this severe thunderstorm warning 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 severe thunderstorm warning went out at Mar 21, 5:19 AM CDT, 2 hours 1 minute earlier.

Area forecast discussion, Mar 21, 5:19 AM CDT, 2 hours 1 minute before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LAKE CHARLES LA
519 AM CDT WED MAR 21 2012

.DISCUSSION...VIGOROUS UPPER LOW CURRENTLY OVER NORTH TEXAS AND
CONTINUES TO MIGRATE EAST. ASSOCIATED COLD FRONT ADVANCING SLOWLY
EAST ACROSS THE FORECAST AREA AND MARKS A LINE OF STRONGER
CONVECTION. BOUNDARY SITUATED FROM NEAR ALEXANDRIA TO MARSH ISLAND
AND FURTHER SOUTH INTO THE NEAR COASTAL WATERS.

WILL MAINTAIN FLASH FLOOD WATCH ACROSS SOUTH AND CENTRAL
LOUISIANA TODAY. NEW TORNADO WATCH HAS JUST BEEN ISSUED FOR ALONG
AND EAST OF COLD FRONT. DRIER AIR ANTICIPATED TO FILTER INTO THE
AREA FROM THE WEST WITH RAIN CHANCES SLOWLY DIMINISHING THROUGH
THE DAY. IN THE MEANTIME ACTIVE WEATHER TO PERSIST.

&&

.MARINE...A COLD FRONT WILL SLOWLY PROGRESS ACROSS THE NORTHWEST
GULF WITH A STRONG ONSHORE FLOW AHEAD OF THE BOUNDARY BECOMING
NORTHWEST IN ITS WAKE.

&&

.PRELIMINARY POINT TEMPS/POPS...
KLCH  61  47  76  57  79 /  90  20  10  10  10
KBPT  59  48  77  55  80 /  50  10  10  10  10
KAEX  57  44  75  54  79 / 100  40  10  10  10
KLFT  70  52  77  60  82 / 100  40  20  20  10

&&

.LCH WATCHES/WARNINGS/ADVISORIES...
LA...FLASH FLOOD WATCH THROUGH THIS EVENING FOR THE FOLLOWING ZONES:
     ACADIA...ALLEN...AVOYELLES...BEAUREGARD...CALCASIEU...EAST
     CAMERON...EVANGELINE...IBERIA...JEFFERSON DAVIS...
     LAFAYETTE...LOWER ST. MARTIN...RAPIDES...ST. LANDRY...ST.
     MARY...UPPER ST. MARTIN...VERMILION...VERNON...WEST CAMERON.

     COASTAL FLOOD ADVISORY UNTIL NOON CDT TODAY FOR THE FOLLOWING
     ZONES: IBERIA...ST. MARY...VERMILION.

     WIND ADVISORY UNTIL NOON CDT TODAY FOR THE FOLLOWING ZONES:
     IBERIA...LOWER ST. MARTIN...ST. MARY...VERMILION.

TX...NONE.
GM...SMALL CRAFT ADVISORY UNTIL 1 PM CDT THIS AFTERNOON FOR THE
     FOLLOWING ZONES: 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...
     VERMILION BAY...WATERS FROM INTRACOASTAL CITY TO CAMERON LA
     FROM 20 TO 60 NM...WATERS FROM CAMERON LA TO HIGH ISLAND TX
     FROM 20 TO 60 NM...WATERS FROM LOWER ATCHAFALAYA RIVER TO
     INTRACOASTAL CITY LA FROM 20 TO 60 NM.

&&

MARCOTTE

Hazardous weather outlook, Mar 21, 5:26 AM CDT, 1 hour 54 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LAKE CHARLES LA
526 AM CDT WED MAR 21 2012

GMZ430-432-435-450-452-455-470-472-475-LAZ027>033-041>045-052>055-
073-074-TXZ180-201-215-216-259>262-221030-
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-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-
526 AM CDT WED MAR 21 2012

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

.DAY ONE...TODAY AND TONIGHT

A TORNADO WATCH IS IN EFFECT UNTIL NOON FOR PORTIONS OF LOUISIANA.
A FLASH FLOOD WATCH IS IN EFFECT FOR MUCH OF THE AREA UNTIL THIS
EVENING. A STRONG UPPER LOW OVER NORTH TEXAS AND AN ASSOCIATED
COLD FRONT ADVANCING ACROSS THE AREA WILL MAINTAIN A VERY
UNSETTLED WEATHER PATTERN WITH A THREAT OF SEVERE WEATHER AND
FLOODING RAINS. THIS THREAT WILL DIMINISH AS THE DAY PROGRESSES.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

SIGNIFICANT WEATHER IS NOT ANTICIPATED.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE REQUIRED.

In the hours before

Local storm report, Mar 21, 5:31 AM CDT, 1 hour 49 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAKE CHARLES LA
531 AM CDT WED MAR 21 2012

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

0525 AM     TSTM WND DMG     LAKE ARTHUR             30.08N 92.68W
03/21/2012                   JEFFERSON DAVIS    LA   LAW ENFORCEMENT

            KPLC TV RELAYED A PUBLIC REPORT OF ROOFS BLOWN OFF OF
            HOMES AND NUMEROUS POWERLINES DOWN IN LAKE ARTHUR. THE
            MAIN STREET IN LAKE ARTHUR IS BLOCKED

&&

DJONES

Local storm report, Mar 21, 6:14 AM CDT, 1 hour 6 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAKE CHARLES LA
614 AM CDT WED MAR 21 2012

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

0608 AM     FLASH FLOOD      EUNICE                  30.49N 92.42W
03/21/2012                   ACADIA             LA   EMERGENCY MNGR

            ST LANDRY OHSEP REPORTS A 1 HOUR RAINFALL OF 3.16 INCHES
            AT A GAUGE IN EUNICE.

&&

DJONES

Local storm report, Mar 21, 6:19 AM CDT, 1 hour 1 minute before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAKE CHARLES LA
619 AM CDT WED MAR 21 2012

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

0605 AM     TSTM WND GST     ABBEVILLE               29.97N 92.12W
03/21/2012  E60 MPH          VERMILION          LA   PUBLIC

            PUBLIC REPORTS AN ESTIMATED WIND GUST OF 60 MPH NEAR
            ABBEVILLE.

&&

DJONES

Local storm report, Mar 21, 6:42 AM CDT, 38 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAKE CHARLES LA
642 AM CDT WED MAR 21 2012

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

0552 AM     TSTM WND DMG     ABBEVILLE               29.97N 92.12W
03/21/2012                   VERMILION          LA   EMERGENCY MNGR

            DEBRIS ON SOUTH HENRY RD NEAR THE ABBEVILLE AIRPORT. A
            VEHICLE STRUCK A TREE ON THE ROADWAY. A SHED WAS ALSO
            DESTROYED.

0552 AM     TSTM WND DMG     2 SW ABBEVILLE          29.95N 92.15W
03/21/2012                   VERMILION          LA   EMERGENCY MNGR

            DEBRIS AND TREES REPORTED ON THE PERRY BRIDGE.

&&

DJONES

Special weather statement, Mar 21, 7:01 AM CDT, 19 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE LAKE CHARLES LA
701 AM CDT WED MAR 21 2012

LAZ028-029-032-033-043>045-052>055-211300-
ST. LANDRY LA-RAPIDES LA-LAFAYETTE LA-EVANGELINE LA-ACADIA LA-
AVOYELLES LA-UPPER ST. MARTIN LA-LOWER ST. MARTIN LA-VERMILION LA-
IBERIA LA-ST. MARY LA-
701 AM CDT WED MAR 21 2012

...SIGNIFICANT WEATHER ADVISORY FOR ST. LANDRY...RAPIDES...
LAFAYETTE...EVANGELINE...ACADIA...AVOYELLES...VERMILION...ST. MARY...
IBERIA AND ST. MARTIN PARISHES UNTIL 800 AM CDT...

AT 657 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
LINE OF STRONG THUNDERSTORMS FROM 12 MILES NORTHEAST OF EFFIE TO 7
MILES SOUTHWEST OF JEANERETTE...MOVING EAST AT 40 MPH.

* THE LINE OF STRONG THUNDERSTORMS WILL BE NEAR...
  SORREL...SIMMESPORT...LAKE PELBA AND LAKE FAUSSE POINTE BY 710
  AM...
  MELVILLE...CHARENTON...BIG BEND AND BALDWIN BY 715 AM...

THE PRIMARY THREATS FROM THESE STORMS ARE FREQUENT LIGHTNING AND WIND
GUSTS TO NEAR 40 MPH...WHICH COULD DOWN TREE LIMBS AND BLOW AROUND
UNSECURED SMALL OBJECTS. SEEK SHELTER IN A SAFE HOME OR BUILDING
UNTIL THESE STORMS HAVE PASSED.

A TORNADO WATCH REMAINS IN EFFECT UNTIL NOON WEDNESDAY FOR
SOUTHWESTERN LOUISIANA.

LAT...LON 3132 9200 3123 9199 3130 9191 3120 9168
      3085 9181 3071 9173 3056 9175 3043 9163
      3026 9159 3023 9147 3011 9147 3006 9130
      2983 9123 2979 9186 2980 9184 2982 9190
      2978 9205 3139 9234 3142 9215

21

Local storm report, Mar 21, 7:19 AM CDT, 1 minute before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LAKE CHARLES LA
719 AM CDT WED MAR 21 2012

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

0700 AM     TSTM WND DMG     HESSMER                 31.05N 92.12W
03/21/2012                   AVOYELLES          LA   BROADCAST MEDIA

            KALB TV REPORTS TREES DOWN AND TIN WRAPPED AROUND TREES
            AT 2236 SMITH ST IN HESSMER.

&&

DJONES

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 20, 7:25 PM CDT	Tornado Warning	LCH	Calcasieu	35 min
Mar 20, 7:29 PM CDT	Flash Flood Warning	LCH	Beauregard, Calcasieu, Vernon	5 hr
Mar 20, 8:14 PM CDT	River Flood Warning	LCH	Vernon	5 days
Mar 20, 8:14 PM CDT	River Flood Warning	LCH	Beauregard, Calcasieu	26 days
Mar 20, 8:20 PM CDT	Special Marine Warning	LCH		55 min
Mar 20, 8:57 PM CDT	Flash Flood Warning	LCH	Beauregard, Calcasieu	6 hr
Mar 20, 11:59 PM CDT	Special Marine Warning	LCH		61 min
Mar 21, 12:19 AM CDT	Flash Flood Warning	LCH	Beauregard, Calcasieu, Vernon	6 hr
Mar 21, 12:28 AM CDT	Severe Thunderstorm Warning	LCH	Calcasieu, Cameron, Jefferson Davis	62 min
Mar 21, 12:33 AM CDT	Tornado Warning	LCH	Calcasieu, Cameron, Jefferson Davis	27 min
Mar 21, 1:26 AM CDT	Tornado Warning	LCH	Jefferson Davis	19 min
Mar 21, 1:31 AM CDT	Severe Thunderstorm Warning	LCH	Acadia, Calcasieu, Cameron, Jefferson Davis, Vermilion	59 min
Mar 21, 1:50 AM CDT	Severe Thunderstorm Warning	LCH	Allen, Jefferson Davis	55 min
Mar 21, 2:13 AM CDT	Special Weather Statement	LCH	Beauregard	62 min
Mar 21, 2:56 AM CDT	Flash Flood Warning	LCH	Allen, Jefferson Davis	4 hr
Mar 21, 3:41 AM CDT	Tornado Warning	LCH	Cameron, Vermilion	34 min
Mar 21, 3:48 AM CDT	Wind Advisory	LCH	Saint Martin	6 hr
Mar 21, 3:55 AM CDT	Special Marine Warning	LCH		65 min
Mar 21, 4:04 AM CDT	Tornado Warning	LCH	Acadia, Cameron, Jefferson Davis, Vermilion	26 min
Mar 21, 4:35 AM CDT	Tornado Warning	LCH	Vermilion	25 min
Mar 21, 4:44 AM CDT	Tornado Warning	LCH	Acadia, Vermilion	31 min
Mar 21, 4:51 AM CDT	Special Marine Warning	LCH		54 min
Mar 21, 5:17 AM CDT	Tornado Warning	LCH	Vermilion	28 min
Mar 21, 5:34 AM CDT	Severe Thunderstorm Warning	LCH	Acadia, Evangeline, Lafayette, Saint Landry, Vermilion	56 min
Mar 21, 5:51 AM CDT	Tornado Warning	LCH	Lafayette, Vermilion	24 min
Mar 21, 6:00 AM CDT	Special Marine Warning	LCH		60 min
Mar 21, 6:10 AM CDT	Areal Flood Warning	LCH	Beauregard, Calcasieu, Vernon	5 days
Mar 21, 7:01 AM CDT	Special Weather Statement	LCH	Avoyelles, Lafayette, Saint Landry, Saint Martin	59 min
Mar 21, 7:10 AM CDT	Special Marine Warning	LCH		65 min
Mar 21, 7:24 AM CDT	Severe Thunderstorm Warning	LCH	Iberia, Saint Martin	47 min
Mar 21, 7:54 AM CDT	Areal Flood Warning	LCH	Iberia, St. Mary	3 hr
Mar 21, 8:10 AM CDT	Severe Thunderstorm Warning	LCH	Iberia, Saint Martin, St. Mary	65 min
Mar 21, 10:45 AM CDT	River Flood Warning	LCH	Beauregard, Vernon	5 days
Mar 21, 4:17 PM CDT	Areal Flood Advisory	LCH	Iberia, Saint Martin, St. Mary	3 hr

Nearby

Severe Thunderstorm Warnings in Louisiana, 2012 Every severe thunderstorm warning in 2012

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive.