Alert archive / South Carolina / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 389, NWS Greenville-Spartanburg, SC

June 15, 2011Abbeville County, Greenwood County, South Carolina; Elbert County, Georgia

NWS Greenville-Spartanburg, SC issued this severe thunderstorm warning at Jun 15, 2011, 8:14 PM EDT for Abbeville County, Greenwood County, South Carolina; Elbert County, Georgia. It was in force for 46 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: Jun 15, 2011, 8:14 PM EDT (00:14 UTC)
Expired: Jun 15, 2011, 9:00 PM EDT
In force: 46 min
Issued by: NWS Greenville-Spartanburg, SC
Area: Storm-based polygon

Counties Elbert County, GA, Abbeville County, SC, Greenwood County, SC

The radar

The Greer radar (KGSP), 96 km from the middle of the area, began a volume at 00:15 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
Jun 15, 8:19 PM EDT	HAIL 2	Greenwood, SC	TIME ESTIMATED BY RADAR.

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

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched one storm report to this severe thunderstorm warning; the first came 5 minutes after it went out.

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
Jun 15, 7:35 PM EDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 00:00Z, 0.2 hours before the alert went out and 209 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: 1682 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 2119 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 48 m²/s²
0-3 km storm-relative helicity: 112 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.4

Open this sounding in Storm Lab

The text

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

435 
WUUS52 KGSP 160014
SVRGSP
GAC105-SCC001-047-160100-
/O.NEW.KGSP.SV.W.0389.110616T0014Z-110616T0100Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
814 PM EDT WED JUN 15 2011

THE NATIONAL WEATHER SERVICE IN GREENVILLE-SPARTANBURG HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN ELBERT COUNTY IN NORTHEAST GEORGIA...
  SOUTHERN ABBEVILLE COUNTY IN UPSTATE SOUTH CAROLINA...
  GREENWOOD COUNTY IN UPSTATE SOUTH CAROLINA...

* UNTIL 900 PM EDT

* AT 811 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
  HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE
  LOCATED ALONG A LINE EXTENDING FROM GREENWOOD TO ELBERTON...MOVING
  SOUTHEAST AT 30 MPH.

* LOCATIONS IMPACTED INCLUDE...
  VERDERY AND CALHOUN FALLS...
  NINETY SIX AND FORTSONIA...
  DYSON...
  TROY AND CALLISON...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

PEOPLE IN THE PATH OF THIS LINE OF SEVERE THUNDERSTORMS SHOULD BE
ALERT FOR LARGE HAIL AND DAMAGING WINDS. FREQUENT LIGHTNING AND
LOCALLY HEAVY RAIN CAN OCCUR WITH ANY THUNDERSTORM. SEEK SHELTER
INDOORS AWAY FROM WINDOWS AND DOORS UNTIL THE STORM PASSES.

TO REPORT DAMAGING WINDS...LARGE HAIL...OR FLOODING...THROUGH OUR
AUTOMATED REPORTING SYSTEM...CALL OUR TOLL FREE NUMBER...
1 8 7 7...6 3 3...6 7 7 2.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL MIDNIGHT EDT
THURSDAY MORNING FOR NORTHEAST GEORGIA AND CENTRAL SOUTH CAROLINA.

&&

LAT...LON 3398 8205 3397 8219 3401 8224 3397 8231
      3406 8234 3405 8242 3407 8248 3407 8253
      3401 8259 3396 8256 3398 8266 3398 8286
      3404 8298 3413 8305 3428 8207 3413 8187
      3398 8199 3395 8204
TIME...MOT...LOC 0014Z 325DEG 27KT 3418 8214 3409 8284

$$

NED

2 follow-up statements

995 
WWUS52 KGSP 160046
SVSGSP

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
846 PM EDT WED JUN 15 2011

GAC105-160056-
/O.CAN.KGSP.SV.W.0389.000000T0000Z-110616T0100Z/
ELBERT GA-
846 PM EDT WED JUN 15 2011

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN ELBERT COUNTY IS
CANCELLED...

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL MIDNIGHT EDT
THURSDAY MORNING FOR NORTHEAST GEORGIA AND CENTRAL SOUTH CAROLINA.

LAT...LON 3395 8204 3398 8205 3397 8219 3401 8224
      3397 8231 3406 8234 3405 8242 3407 8248
      3407 8253 3402 8259 3410 8265 3411 8265
      3428 8207 3413 8187 3398 8199
TIME...MOT...LOC 0046Z 285DEG 25KT 3406 8224

$$

SCC001-047-160100-
/O.CON.KGSP.SV.W.0389.000000T0000Z-110616T0100Z/
ABBEVILLE SC-GREENWOOD SC-
846 PM EDT WED JUN 15 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM EDT
FOR GREENWOOD AND SOUTHERN ABBEVILLE COUNTIES...

AT 845 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS
LOCATED 3 MILES SOUTH OF VERDERY...OR 10 MILES SOUTHWEST OF
GREENWOOD...MOVING EAST AT 30 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
CORONACA...NINETY SIX...DYSON AND CALLISON

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TO REPORT DAMAGING WINDS...LARGE HAIL...OR FLOODING...THROUGH OUR
AUTOMATED REPORTING SYSTEM...CALL OUR TOLL FREE NUMBER...
1 8 7 7...6 3 3...6 7 7 2.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL MIDNIGHT EDT
THURSDAY MORNING FOR NORTHEAST GEORGIA AND CENTRAL SOUTH CAROLINA.

&&

LAT...LON 3395 8204 3398 8205 3397 8219 3401 8224
      3397 8231 3406 8234 3405 8242 3407 8248
      3407 8253 3402 8259 3410 8265 3411 8265
      3428 8207 3413 8187 3398 8199
TIME...MOT...LOC 0046Z 285DEG 25KT 3406 8224

$$

NED

195 
WWUS52 KGSP 160101
SVSGSP

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
901 PM EDT WED JUN 15 2011

SCC001-047-160111-
/O.EXP.KGSP.SV.W.0389.000000T0000Z-110616T0100Z/
ABBEVILLE SC-GREENWOOD SC-
901 PM EDT WED JUN 15 2011

...THE SEVERE THUNDERSTORM WARNING FOR GREENWOOD AND SOUTHERN
ABBEVILLE COUNTIES HAS EXPIRED...

GUSTY WINDS AND OCCASIONAL CLOUD TO GROUND LIGHTNING WILL CONTINUE 
ACROSS GREENWOOD AND ABBEVILLE COUNTIES THROUGH 1030 PM.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL MIDNIGHT EDT
THURSDAY MORNING FOR NORTHEAST GEORGIA AND CENTRAL SOUTH CAROLINA.

LAT...LON 3395 8204 3398 8205 3397 8219 3401 8224
      3397 8231 3406 8234 3405 8242 3407 8248
      3407 8253 3402 8259 3410 8265 3411 8265
      3428 8207 3413 8187 3398 8199
TIME...MOT...LOC 0046Z 285DEG 25KT 3406 8224

$$

NED

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 Greenville-Spartanburg, SC wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 15, 3:32 PM EDT, 4 hours 42 minutes earlier.

Area forecast discussion, Jun 15, 3:32 PM EDT, 4 hours 42 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
ISSUED BY NATIONAL WEATHER SERVICE COLUMBIA SC
332 PM EDT WED JUN 15 2011

.SYNOPSIS...
A FRONT WILL MOVE INTO THE FORECAST AREA TONIGHT. THE FRONT WILL
LINGER NEAR THE AREA THROUGH THE WEEKEND.

&&

.NEAR TERM /UNTIL 6 AM THURSDAY MORNING/...
CONVERGENCE ASSOCIATED WITH A WEAK SURFACE FRONT PLUS MOISTURE AND
INSTABILITY ASSOCIATED WITH A MID-LEVEL SHORTWAVE TROUGH SHOULD
RESULT IN NUMEROUS SHOWERS AND THUNDERSTORMS TONIGHT. MODERATE
INSTABILITY AND WEAK TO MODERATE SHEAR SHOULD RESULT IN ORGANIZED
THUNDERSTORMS. EXPECT A FEW THUNDERSTORMS WITH DAMAGING WIND AND
HAIL. CLOUDINESS SHOULD HELP HOLD UP TEMPERATURES AND THE GUIDANCE
MAY BE A LITTLE TOO WARM.

&&

.SHORT TERM /6 AM THURSDAY MORNING THROUGH THURSDAY NIGHT/...
THE NAM AND GFS SHOW DEEPER MOISTURE SHIFTING EAST OF THE FORECAST
AREA BEHIND THE MAIN MID-LEVEL SHORTWAVE TROUGH THURSDAY.
HOWEVER...THE MODELS KEEP THE WEAK SURFACE TROUGH IN THE AREA WITH
RELATIVELY COLD TEMPERATURES ALOFT. EXPECT THUNDERSTORMS BUT
COVERAGE SHOULD BE LIMITED BY MOISTURE. THE NAM AND GFS MOS
SUPPORT SLIGHT CHANCE OR CHANCE POPS. THE NAM INDICATES SURFACE-
BASED LI/S -4 TO -8 SO SEVERE THUNDERSTORMS MAY OCCUR.

&&

.LONG TERM /FRIDAY THROUGH WEDNESDAY/...
MODELS IN GENERAL AGREEMENT ON AN UPPER RIDGE REMAINING ANCHORED
OVER THE MID SOUTH WHILE THE FORECAST STAYS WITHIN THE
NORTHWESTERLY FLOW ON THE PERIPHERY OF THE HIGH. IN THE LOW
LEVELS...A FRONTAL BOUNDARY IS SHOWN TO REMAIN STALLED OUT ACROSS
THE AREA...KEEPING THE AREA WITHIN DEEPER MOISTURE AND
CONVERGENCE. KEPT THE GOING FORECAST OF ABOVE NORMAL TEMPERATURES
AND MAINLY A DIURNAL POP TREND (CHANCE MOUNTAINS AND SLIGHT CHANCE
PIEDMONT) EACH AFTERNOON.

&&

.AVIATION /20Z WEDNESDAY THROUGH MONDAY/...
AT KCLT...HIGH PRESSURE OVER THE REGION WILL WEAKEN THIS AFTERNOON
AS A COLD FRONT APPROACHES FROM THE WEST LATE TONIGHT AND
THURSDAY MORNING. MOISTURE FLUX WILL INCREASE OVER THE FORECAST
AREA THIS EVENING. INITIAL VFR CONDITIONS ARE EXPECTED TO BECOME
MVFR MAINLY BECAUSE OF CIGS 2-3 KFT AND SOME VSBYS 4-5 MILES IN
SHOWERS. BRIEF IFR CONDITIONS MAY OCCUR IN HEAVIER SHOWERS AND
THUNDERSTORMS FROM 04Z-14Z THURSDAY MORNING. COLD FRONT SHOULD
MOVE THROUGH THE AREA LATE THURSDAY MORNING 14Z-16Z TIME FRAME.
AFTER 14Z...MAINLY VFR CONDITIONS ARE EXPECTED.

ELSEWHERE...HIGH PRESSURE OVER THE REGION WILL WEAKEN THIS AFTERNOON
AS A COLD FRONT APPROACHES FROM THE WEST LATE TONIGHT AND
THURSDAY MORNING. MOISTURE FLUX WILL INCREASE OVER THE FORECAST
AREA THIS EVENING. INITIAL VFR CONDITIONS ARE EXPECTED TO BECOME
MVFR MAINLY BECAUSE OF CIGS 2-3 KFT AND SOME VSBYS 4-5 MILES IN
SHOWERS. BRIEF IFR CONDITIONS MAY OCCUR IN HEAVIER SHOWERS AND
THUNDERSTORMS FROM 04Z-14Z THURSDAY MORNING. COLD FRONT SHOULD
MOVE THROUGH THE AREA LATE THURSDAY MORNING 14Z-16Z TIME FRAME.
AFTER 14Z...MAINLY VFR CONDITIONS ARE EXPECTED.

EXTENDED AVIATION OUTLOOK...DIURNALLY CONVECTIVE ACTIVITY WITH
DAYTIME HEATING AS IMPULSES MOVING ACROSS THE REGION IN THE
NORTHWEST FLOW INTO NEXT TUESDAY WILL PRODUCE BRIEF PERIODS OF
IFR/MVFR CONDITIONS IN SHOWERS AND THUNDERSTORMS.

&&

.GSP WATCHES/WARNINGS/ADVISORIES...
GA...NONE.
NC...NONE.
SC...NONE.

&&

Hazardous weather outlook, Jun 15, 1:18 PM EDT, 6 hours 56 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
118 PM EDT WED JUN 15 2011

GAZ018-026-028-029-NCZ033-035>037-049-050-053-056-057-064-065-
068>072-082-501>510-SCZ001>014-019-161730-
STEPHENS-FRANKLIN-HART-ELBERT-AVERY-ALEXANDER-IREDELL-DAVIE-YANCEY-
MITCHELL-BUNCOMBE-CATAWBA-ROWAN-TRANSYLVANIA-HENDERSON-CLEVELAND-
LINCOLN-GASTON-MECKLENBURG-CABARRUS-UNION NC-CALDWELL MOUNTAINS-
GREATER CALDWELL-BURKE MOUNTAINS-GREATER BURKE-MCDOWELL MOUNTAINS-
EASTERN MCDOWELL-RUTHERFORD MOUNTAINS-GREATER RUTHERFORD-
POLK MOUNTAINS-EASTERN POLK-OCONEE MOUNTAINS-PICKENS MOUNTAINS-
GREENVILLE MOUNTAINS-GREATER OCONEE-GREATER PICKENS-
GREATER GREENVILLE-SPARTANBURG-CHEROKEE-YORK-ANDERSON-ABBEVILLE-
LAURENS-UNION SC-CHESTER-GREENWOOD-
118 PM EDT WED JUN 15 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST GEORGIA...PIEDMONT
NORTH CAROLINA...WESTERN NORTH CAROLINA AND UPSTATE SOUTH CAROLINA.

.DAY ONE...THIS AFTERNOON AND TONIGHT.
THUNDERSTORMS THIS AFTERNOON AND TONIGHT COULD POSSIBLY BECOME
SEVERE. THE MAIN THREAT WILL BE DAMAGING WIND AND HAIL.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY.

A FRONT WILL EXTEND THROUGH THE AREA THURSDAY. THERE IS A SLIGHT
RISK OF SEVERE STORMS ALONG THE FRONT...MAINLY ACROSS THE
PIEDMONT.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED.

GAZ010-017-NCZ048-051-052-058-059-062-063-161730-
RABUN-HABERSHAM-MADISON-SWAIN-HAYWOOD-GRAHAM-NORTHERN JACKSON-MACON-
SOUTHERN JACKSON-
118 PM EDT WED JUN 15 2011

...SEVERE THUNDERSTORM WATCH 478 IN EFFECT UNTIL 8 PM EDT THIS
EVENING...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST GEORGIA AND WESTERN
NORTH CAROLINA.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE
INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARD.

   SEVERE THUNDERSTORM WATCH.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY.

A FRONT WILL EXTEND THROUGH THE AREA THURSDAY. THERE IS A SLIGHT
RISK OF SEVERE STORMS ALONG THE FRONT...MAINLY ACROSS THE
PIEDMONT.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED.

In the hours before

Local storm report, Jun 15, 7:04 PM EDT, 1 hour 10 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
704 PM EDT WED JUN 15 2011

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

0625 PM     HAIL             2 N TIGERVILLE          35.10N 82.37W
06/15/2011  E1.00 INCH       GREENVILLE         SC   TRAINED SPOTTER

            1 INCH HAIL 2 MILES NORTH OF TIGERVILLE.

&&

JPT

Local storm report, Jun 15, 7:19 PM EDT, 55 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
719 PM EDT WED JUN 15 2011

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

0653 PM     HAIL             CAMPOBELLO              35.12N 82.15W
06/15/2011  E1.00 INCH       SPARTANBURG        SC   PUBLIC

            ONE INCH HAIL

0656 PM     TSTM WND DMG     4 S GREER               34.88N 82.23W
06/15/2011                   GREENVILLE         SC   NWS EMPLOYEE

            MULTIPLE TREES DOWN AT GSP AIRPORT

&&

RB

Local storm report, Jun 15, 7:22 PM EDT, 52 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
722 PM EDT WED JUN 15 2011

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

0703 PM     TSTM WND DMG     MOORE                   34.83N 81.99W
06/15/2011                   SPARTANBURG        SC   TRAINED SPOTTER

            MULTIPLE TREES DOWN.

&&

RB

Local storm report, Jun 15, 7:36 PM EDT, 38 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
736 PM EDT WED JUN 15 2011

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

0635 PM     TSTM WND DMG     5 N TAYLORS             34.99N 82.31W
06/15/2011                   GREENVILLE         SC   NWS EMPLOYEE

            TREES DOWN AT LAKE CUNNINGHAM...TREE ON HOUSE

&&

RB

Local storm report, Jun 15, 8:05 PM EDT, 9 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
805 PM EDT WED JUN 15 2011

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

0655 PM     HAIL             2 S REIDVILLE           34.83N 82.11W
06/15/2011  E1.25 INCH       SPARTANBURG        SC   TRAINED SPOTTER

            UP TO HALF DOLLAR SIZED HAIL IN REIDVILLE.

&&

JPT

Local storm report, Jun 15, 8:08 PM EDT, 6 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
808 PM EDT WED JUN 15 2011

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

0530 PM     TSTM WND DMG     FRANKLIN                35.18N 83.38W
06/15/2011                   MACON              NC   TRAINED SPOTTER

            MULTIPLE TREES DOWN IN FRANKLIN

&&

RB

The office that day

Everything else NWS Greenville-Spartanburg, SC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 16, 5:40 PM EDT	Severe Thunderstorm Warning	GSP	Spartanburg	50 min
Jun 16, 6:37 PM EDT	Special Weather Statement	GSP	Spartanburg	23 min

Nearby

Severe Thunderstorm Warnings in South Carolina, 2011 Severe Thunderstorm Warnings in Georgia, 2011 Every severe thunderstorm warning 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.