Alert archive / Arkansas / Tornado Warnings in 2011

Tornado Warning 79, NWS Little Rock, AR

April 25, 20115 counties in Arkansas

NWS Little Rock, AR issued this tornado warning at Apr 25, 2011, 4:54 PM CDT for 5 counties in Arkansas. It was in force for 51 min. 6 reports 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: Apr 25, 2011, 4:54 PM CDT (21:54 UTC)
Expired: Apr 25, 2011, 5:45 PM CDT
In force: 51 min
Issued by: NWS Little Rock, AR
Area: Storm-based polygon

Counties Clark County, AR, Garland County, AR, Hot Spring County, AR, Montgomery County, AR, Saline County, AR

The radar

The Little Rock radar (KLZK), 81 km from the middle of the area, began a volume at 21:53 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.

What was reported inside it

Time	Report	Where	Remark
Apr 25, 5:07 PM CDT	TSTM WND DMG	2 Nw Sunshine, AR	* 2 INJ * HOUSES WERE DAMAGED...WITH PEOPLE TRAPPED INSIDE.
Apr 25, 5:07 PM CDT	TSTM WND DMG	3 Nw Royal, AR	A ROOF WAS BLOWN OFF OF A HOUSE AT BRADY MOUNTAIN ROAD AND OWL CREEK ROAD.
Apr 25, 5:07 PM CDT	TSTM WND DMG	5 W Royal, AR	STRUCTURAL DAMAGE WAS REPORTED AT RAGWEED VALLEY...WHICH IS ABOUT FIVE MILES WEST OF ROYAL.
Apr 25, 5:15 PM CDT	TSTM WND DMG	Brady Mountain Recreati, AR	LARGE TREES WERE BLOWN DOWN ON HOUSES AND POWER LINES NEAR BRADY MOUNTAIN.
Apr 25, 5:21 PM CDT	TSTM WND DMG	Lake Ouachita State Par, AR	CONSIDERABLE DAMAGE WAS REPORTED AT LAKE OUACHITA STATE PARK.
Apr 25, 5:44 PM CDT	TSTM WND DMG	Bonnerdale, AR	A TREE WAS BLOWN DOWN...AND IS BLOCKING HIGHWAY 70.

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

The watch it was issued in

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

Issued	Product	Office	Lasted
Apr 25, 11:00 AM CDT	Tornado Watch	SPC	7 hr
Apr 25, 3:22 PM CDT	Tornado Watch PDS	SPC	8 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 9.9 hours before the alert went out and 249 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: 1213 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 759 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 231 m²/s²
0-3 km storm-relative helicity: 491 m²/s²
Significant tornado parameter: 2.2
Supercell composite: 11.5

Open this sounding in Storm Lab

The text

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

935 
WFUS54 KLZK 252154
TORLZK
ARC019-051-059-097-125-252245-
/O.NEW.KLZK.TO.W.0079.110425T2154Z-110425T2245Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE LITTLE ROCK AR
454 PM CDT MON APR 25 2011

THE NATIONAL WEATHER SERVICE IN LITTLE ROCK HAS ISSUED A

* TORNADO WARNING FOR...
  WESTERN SALINE COUNTY IN CENTRAL ARKANSAS...
  GARLAND COUNTY IN CENTRAL ARKANSAS...
  SOUTHEASTERN MONTGOMERY COUNTY IN WESTERN ARKANSAS...
  NORTHERN HOT SPRING COUNTY IN SOUTHWEST ARKANSAS...
  EXTREME NORTHWESTERN CLARK COUNTY IN SOUTHWEST ARKANSAS...

* UNTIL 545 PM CDT

* AT 453 PM CDT...TRAINED WEATHER SPOTTERS REPORTED A FUNNEL CLOUD.
  NATIONAL WEATHER SERVICE DOPPLER RADAR ALSO INDICATED A SEVERE
  THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS SEVERE STORM WAS
  LOCATED 3 MILES SOUTH OF MEYERS...OR 13 MILES SOUTH OF LAKE
  OUACHITA. DOPPLER RADAR SHOWED THIS SEVERE STORM MOVING NORTHEAST
  AT 40 MPH.

* LOCATIONS IN THE PATH OF THIS TORNADO INCLUDE...
  PINEY...              ROCKWELL...           LAKE OUACHITA...
  LAKE HAMILTON...      HOT SPRINGS...        MOUNTAIN PINE...
  MEYERS...             LONSDALE...           LOFTON...
  LENA LNDG REC AREA... LAKE OUACHITA SP...   LAKE LAGO...
  LAKE CORONADO...      LAKE CATHERINE...     LAKE BALBOA...
  JESSIEVILLE...        HOT SPGS VILLAGE...  
  HOT SPRINGS NATL PARK...

THIS INCLUDES INTERSTATE 30 BETWEEN MILE MARKERS 103 AND 110.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO THE TORNADO...THIS STORM IS CAPABLE OF PRODUCING LARGE
DAMAGING HAIL UP TO GOLF BALL SIZE...AND DESTRUCTIVE WINDS IN EXCESS
OF 70 MPH..

&&

LAT...LON 3478 9312 3478 9308 3481 9307 3486 9300
      3447 9264 3429 9342 3448 9356
TIME...MOT...LOC 2154Z 233DEG 35KT 3442 9336

$$

62

3 follow-up statements

864 
WWUS54 KLZK 252212
SVSLZK

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LITTLE ROCK AR
512 PM CDT MON APR 25 2011

ARC019-059-097-252221-
/O.CAN.KLZK.TO.W.0079.000000T0000Z-110425T2245Z/
CLARK AR-HOT SPRING AR-MONTGOMERY AR-
512 PM CDT MON APR 25 2011

...THE TORNADO WARNING FOR SOUTHEASTERN MONTGOMERY...NORTHERN HOT
SPRING AND EXTREME NORTHWESTERN CLARK COUNTIES IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA. HOWEVER...ANOTHER POSSIBLE TORNADO ASSOCIATED WITH A SEPARATE 
SEVERE THUNDERSTORM WILL MOVE OVER MANY OF THE SAME AREAS.

LAT...LON 3478 9312 3478 9308 3481 9307 3486 9300
      3461 9280 3446 9325 3455 9336
TIME...MOT...LOC 2211Z 223DEG 34KT 3455 9324

$$

ARC051-125-252245-
/O.CON.KLZK.TO.W.0079.000000T0000Z-110425T2245Z/
GARLAND AR-SALINE AR-
512 PM CDT MON APR 25 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHWESTERN SALINE AND
GARLAND COUNTIES UNTIL 545 PM CDT...

AT 507 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS
DANGEROUS STORM WAS LOCATED 6 MILES SOUTH OF LAKE OUACHITA...MOVING
NORTHEAST AT 40 MPH.

* LOCATIONS IN OR NEAR THE PATH OF THIS DANGEROUS STORM INCLUDE...
  PINEY...              LAKE OUACHITA...      MOUNTAIN PINE...
  LENA LNDG REC AREA... LAKE OUACHITA SP...   LAKE LAGO...
  LAKE CORONADO...      LAKE BALBOA...        JESSIEVILLE...
  HOT SPGS VILLAGE...   ROYAL...              OWENSVILLE...
  MOUNTAIN VALLEY...    HAMILTON...           WHITTINGTON...
  THREE SISTERS LNDG... SUGARLOAF MTN...      SPILLWAY REC AREA...

THIS STORM HAS A HISTORY OF PRODUCING FUNNEL CLOUDS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 3478 9312 3478 9308 3481 9307 3486 9300
      3461 9280 3446 9325 3455 9336
TIME...MOT...LOC 2211Z 223DEG 34KT 3455 9324

$$

BJS

307 
WWUS54 KLZK 252220
SVSLZK

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LITTLE ROCK AR
520 PM CDT MON APR 25 2011

ARC051-125-252245-
/O.CON.KLZK.TO.W.0079.000000T0000Z-110425T2245Z/
GARLAND AR-SALINE AR-
520 PM CDT MON APR 25 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHWESTERN SALINE AND
NORTHERN GARLAND COUNTIES UNTIL 545 PM CDT...

AT 516 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO
TRACK A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS
TORNADO WAS LOCATED 2 MILES SOUTHWEST OF LAKE OUACHITA SP...OR 5
MILES EAST OF LAKE OUACHITA...MOVING NORTHEAST AT 40 MPH.

* LOCATIONS IN OR NEAR THE PATH OF THIS TORNADO INCLUDE...
  MOUNTAIN PINE...      LAKE OUACHITA SP...   LAKE LAGO...
  LAKE CORONADO...      LAKE BALBOA...        JESSIEVILLE...
  HOT SPGS VILLAGE...   OWENSVILLE...         MOUNTAIN VALLEY...
  HAMILTON...           WHITTINGTON...        THREE SISTERS LNDG...
  SPILLWAY REC AREA...  SMITH PINNACLE...     SHORT MTN...
  RICKS LAKE...         OZARK LITHIA...       MUSE MTN...

REPORTS OF WIDESPREAD DAMAGE HAVE BEEN NOTED WITH THIS TORNADO. TAKE 
COVER NOW!

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 3478 9312 3478 9308 3481 9307 3486 9300
      3461 9280 3456 9320 3461 9327
TIME...MOT...LOC 2219Z 221DEG 34KT 3461 9319

$$

BJS

281 
WWUS54 KLZK 252233
SVSLZK

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE LITTLE ROCK AR
533 PM CDT MON APR 25 2011

ARC051-125-252245-
/O.CON.KLZK.TO.W.0079.000000T0000Z-110425T2245Z/
GARLAND AR-SALINE AR-
533 PM CDT MON APR 25 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHWESTERN SALINE AND
NORTHEASTERN GARLAND COUNTIES UNTIL 545 PM CDT...

AT 530 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
TORNADO WITH NUMEROUS REPORTS OF DAMAGE.  THIS TORNADO WAS LOCATED 3 
MILES WEST OF JESSIEVILLE...OR 11 MILES NORTHEAST OF LAKE 
OUACHITA...MOVING NORTHEAST AT 40 MPH.

* LOCATIONS IN OR NEAR THE PATH OF THIS TORNADO INCLUDE...
  LAKE LAGO...          LAKE CORONADO...      LAKE BALBOA...
  JESSIEVILLE...        HOT SPGS VILLAGE...   OWENSVILLE...
  MOUNTAIN VALLEY...    HAMILTON...           WHITTINGTON...
  SMITH PINNACLE...     SHORT MTN...          MUSE MTN...
  LAKE PINEDA...        LAKE DESOTO...        LAKE CORTEZ...
  IRON SPRING ROADSIDE PARK...                GOOSEPOND MTN...
  BREAD CREEK PINNACLE...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TO REPEAT...SIGNIFICANT DAMAGE HAS ALREADY BEEN REPORTED WITH THIS 
TORNADO. TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST 
FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A 
VEHICLE OR OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND 
PROTECT YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 3478 9312 3478 9308 3481 9307 3486 9300
      3461 9280 3462 9312 3467 9321
TIME...MOT...LOC 2233Z 219DEG 33KT 3471 9311

$$

BJS

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 24, 7:01 PM CDT	Severe Thunderstorm Warning	LZK	Johnson, Logan, Pope, Scott, Yell	59 min
Apr 24, 7:18 PM CDT	Flash Flood Warning	LZK	Baxter, Boone, Fulton, Izard, Johnson, Marion and 5 more	6 hr
Apr 24, 7:18 PM CDT	Severe Thunderstorm Warning	LZK	Boone, Johnson, Marion, Newton, Pope, Searcy	42 min
Apr 24, 7:36 PM CDT	Tornado Warning	LZK	Logan, Scott	39 min
Apr 24, 7:48 PM CDT	Special Weather Statement	LZK	Baxter	47 min
Apr 24, 7:56 PM CDT	Severe Thunderstorm Warning	LZK	Johnson, Logan, Scott, Yell	49 min
Apr 24, 8:05 PM CDT	Severe Thunderstorm Warning	LZK	Johnson, Newton, Pope, Searcy	40 min
Apr 24, 8:14 PM CDT	Tornado Warning	LZK	Logan, Scott, Yell	46 min
Apr 24, 8:26 PM CDT	Special Weather Statement	LZK	Stone	44 min
Apr 24, 8:32 PM CDT	Special Weather Statement	LZK	Sharp	33 min
Apr 24, 8:42 PM CDT	Flash Flood Warning	LZK	Cleburne, Fulton, Independence, Izard, Pope, Searcy and 3 more	3 hr
Apr 24, 8:44 PM CDT	Severe Thunderstorm Warning	LZK	Johnson, Logan, Pope, Scott, Yell	61 min
Apr 24, 8:55 PM CDT	Tornado Warning	LZK	Logan, Pope, Yell	35 min
Apr 24, 9:09 PM CDT	Special Weather Statement	LZK	Sebastian	46 min
Apr 24, 9:25 PM CDT	River Flood Warning	LZK	Franklin, Johnson, Logan	4 days
Apr 24, 9:28 PM CDT	Tornado Warning	LZK	Conway, Pope, Yell	20 min
Apr 24, 9:47 PM CDT	Severe Thunderstorm Warning	LZK	Conway, Pope, Van Buren	43 min
Apr 24, 9:55 PM CDT	Flash Flood Warning	LZK	Conway, Johnson, Logan, Pope, Scott, Van Buren and 1 more	3 hr
Apr 24, 9:59 PM CDT	Special Weather Statement	LZK	Montgomery, Yell	46 min
Apr 24, 10:07 PM CDT	Severe Thunderstorm Warning	LZK	Logan, Scott, Yell	38 min
Apr 24, 10:18 PM CDT	Tornado Warning	LZK	Yell	34 min
Apr 24, 10:24 PM CDT	Severe Thunderstorm Warning	LZK	Montgomery, Pike, Polk	51 min
Apr 24, 10:25 PM CDT	Severe Thunderstorm Warning	LZK	Cleburne, Conway, Stone, Van Buren	50 min
Apr 24, 10:42 PM CDT	Severe Thunderstorm Warning	LZK	Johnson, Logan, Perry, Pope, Yell	48 min
Apr 24, 10:46 PM CDT	Severe Thunderstorm Warning	LZK	Logan, Scott, Yell	39 min
Apr 24, 11:03 PM CDT	Severe Thunderstorm Warning	LZK	Clark, Garland, Hot Spring, Montgomery, Pike, Scott and 1 more	42 min
Apr 24, 11:06 PM CDT	Severe Thunderstorm Warning	LZK	Conway, Perry, Pope, Yell	39 min
Apr 24, 11:36 PM CDT	Severe Thunderstorm Warning	LZK	Garland, Hot Spring, Perry, Saline	39 min
Apr 24, 11:39 PM CDT	Severe Thunderstorm Warning	LZK	Conway, Faulkner, Perry, Van Buren	51 min
Apr 25, 12:18 AM CDT	Special Weather Statement	LZK	Pulaski, Saline	47 min
Apr 25, 12:35 AM CDT	Special Weather Statement	LZK	White	45 min
Apr 25, 1:05 AM CDT	Special Weather Statement	LZK	Lonoke, Prairie, Pulaski	45 min
Apr 25, 1:09 AM CDT	Severe Thunderstorm Warning	LZK	Lonoke, Pulaski	51 min
Apr 25, 1:21 AM CDT	Flash Flood Warning	LZK	Logan, Scott, Yell	3 hr
Apr 25, 1:36 AM CDT	Flash Flood Warning	LZK	Baxter, Boone, Fulton, Johnson, Marion, Newton and 1 more	3 hr
Apr 25, 1:39 AM CDT	Special Weather Statement	LZK	Woodruff	46 min
Apr 25, 1:42 AM CDT	Severe Thunderstorm Warning	LZK	Clark, Hot Spring, Pike	48 min
Apr 25, 2:03 AM CDT	Special Weather Statement	LZK	Prairie	47 min
Apr 25, 2:31 AM CDT	Special Weather Statement	LZK	Clark, Grant, Hot Spring	44 min
Apr 25, 5:03 AM CDT	Lake Wind Advisory	LZK	Arkansas, Baxter, Bradley, Calhoun, Clark, Cleburne and 28 more	17 hr
Apr 25, 6:01 AM CDT	Severe Thunderstorm Warning	LZK	Polk	44 min
Apr 25, 6:48 AM CDT	Severe Thunderstorm Warning	LZK	Montgomery, Pike, Polk	57 min
Apr 25, 7:00 AM CDT	Flash Flood Warning	LZK	Baxter, Boone, Marion	3 hr
Apr 25, 7:41 AM CDT	Special Weather Statement	LZK	Clark, Garland, Hot Spring, Montgomery	44 min
Apr 25, 8:01 AM CDT	Severe Thunderstorm Warning	LZK	Clark, Dallas, Grant, Hot Spring	44 min
Apr 25, 8:10 AM CDT	Flash Flood Warning	LZK	Baxter, Johnson, Logan, Marion, Newton, Pope and 4 more	3 hr
Apr 25, 8:22 AM CDT	River Flood Warning	LZK	Saline	43 hr
Apr 25, 8:25 AM CDT	Special Weather Statement	LZK	Pulaski, Saline	45 min
Apr 25, 8:39 AM CDT	Severe Thunderstorm Warning	LZK	Cleveland, Dallas, Grant, Hot Spring, Jefferson, Saline	51 min
Apr 25, 9:16 AM CDT	Special Weather Statement	LZK	Lonoke, Prairie, Pulaski	44 min
Apr 25, 9:19 AM CDT	Severe Thunderstorm Warning	LZK	Arkansas, Grant, Jefferson, Lonoke, Prairie, Pulaski and 1 more	41 min
Apr 25, 9:35 AM CDT	Severe Thunderstorm Warning	LZK	Clark, Dallas, Hot Spring, Ouachita, Pike	40 min
Apr 25, 9:45 AM CDT	River Flood Warning	LZK	Conway, Perry	5 days
Apr 25, 9:45 AM CDT	River Flood Warning	LZK	Perry	13 days
Apr 25, 9:54 AM CDT	Severe Thunderstorm Warning	LZK	Arkansas, Jefferson, Lonoke, Monroe, Prairie	51 min
Apr 25, 9:59 AM CDT	Special Weather Statement	LZK	Prairie, Woodruff	46 min
Apr 25, 10:11 AM CDT	Flash Flood Warning	LZK	Clark, Cleveland, Dallas, Grant, Hot Spring, Jefferson and 1 more	3 hr
Apr 25, 10:21 AM CDT	Special Weather Statement	LZK	Dallas	29 min
Apr 25, 10:39 AM CDT	Flash Flood Warning	LZK	Fulton, Independence, Izard, Jackson, Sharp, Stone	3 hr
Apr 25, 10:45 AM CDT	Special Weather Statement	LZK	Arkansas, Monroe	30 min
Apr 25, 11:49 AM CDT	River Flood Warning	LZK	Prairie, White, Woodruff	50 days
Apr 25, 11:49 AM CDT	River Flood Warning	LZK	Prairie	50 days
Apr 25, 11:49 AM CDT	River Flood Warning	LZK	Arkansas, Monroe	58 days
Apr 25, 11:49 AM CDT	River Flood Warning	LZK	White	19 days
Apr 25, 12:16 PM CDT	Severe Thunderstorm Warning	LZK	Polk, Scott	44 min
Apr 25, 12:48 PM CDT	River Flood Warning	LZK	Yell	3 days
Apr 25, 12:58 PM CDT	Special Weather Statement	LZK	Scott	32 min
Apr 25, 1:43 PM CDT	Severe Thunderstorm Warning	LZK	Polk	47 min
Apr 25, 2:06 PM CDT	Tornado Warning	LZK	Johnson, Logan, Scott	39 min
Apr 25, 2:32 PM CDT	Special Weather Statement	LZK	Polk	43 min
Apr 25, 2:35 PM CDT	Tornado Warning	LZK	Montgomery, Polk	25 min
Apr 25, 2:42 PM CDT	Flash Flood Warning	LZK	Montgomery, Polk, Scott	3 hr
Apr 25, 2:55 PM CDT	Flash Flood Warning	LZK	Baxter, Boone, Johnson, Marion, Newton, Pope and 1 more	6 hr
Apr 25, 2:55 PM CDT	Tornado Warning	LZK	Montgomery, Polk	35 min
Apr 25, 3:11 PM CDT	Tornado Warning	LZK	Montgomery, Scott, Yell	34 min
Apr 25, 3:16 PM CDT	Severe Thunderstorm Warning	LZK	Garland, Hot Spring, Montgomery, Perry, Pike, Yell	44 min
Apr 25, 3:37 PM CDT	Severe Thunderstorm Warning	LZK	Logan, Montgomery, Perry, Scott, Yell	38 min
Apr 25, 3:38 PM CDT	Tornado Warning	LZK	Clark, Montgomery, Pike	52 min
Apr 25, 3:40 PM CDT	Tornado Warning	LZK	Garland, Montgomery, Perry	35 min
Apr 25, 3:46 PM CDT	Severe Thunderstorm Warning	LZK	Fulton, Independence, Izard, Sharp, Stone	44 min

Nearby

Tornado Warnings in Arkansas, 2011 Every tornado warning in 2011 Tornadoes 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.