Alert archive / Georgia / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 48, NWS Tallahassee, FL

February 28, 20094 counties in Georgia; Houston County, Alabama

NWS Tallahassee, FL issued this severe thunderstorm warning at Feb 28, 2009, 9:50 PM EST for 4 counties in Georgia; Houston County, Alabama. It was in force for 14 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Feb 28, 2009, 9:50 PM EST (02:50 UTC)
Expired: Feb 28, 2009, 10:04 PM EST
In force: 14 min
Issued by: NWS Tallahassee, FL
Area: Storm-based polygon

Counties Houston County, AL, Decatur County, GA, Early County, GA, Miller County, GA, Seminole County, GA

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
Feb 28, 6:43 PM EST	Tornado Watch	SPC	8 hr

The nearest sounding before it

Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 2.8 hours before the alert went out and 92 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: 491 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 701 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 260 m²/s²
0-3 km storm-relative helicity: 320 m²/s²
Significant tornado parameter: 0.9
Supercell composite: 5.1

Open this sounding in Storm Lab

The text

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

000 
WUUS52 KTAE 010250
SVRTAE
ALC069-GAC087-099-201-253-010330-
/O.NEW.KTAE.SV.W.0048.090301T0250Z-090301T0330Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TALLAHASSEE FL
950 PM EST SAT FEB 28 2009

THE NATIONAL WEATHER SERVICE IN TALLAHASSEE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EXTREME SOUTHEASTERN HOUSTON COUNTY IN SOUTHEAST ALABAMA...
  NORTHWESTERN DECATUR COUNTY IN SOUTHWEST GEORGIA...
  SOUTH CENTRAL EARLY COUNTY IN SOUTHWEST GEORGIA...
  SOUTHWESTERN MILLER COUNTY IN SOUTHWEST GEORGIA...
  THIS INCLUDES THE CITY OF COLQUITT...
  NORTHERN SEMINOLE COUNTY IN SOUTHWEST GEORGIA...
  THIS INCLUDES THE CITY OF DONALSONVILLE...

* UNTIL 1030 PM EST/930 PM CST/

* AT 845 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 9 MILES
  WEST OF DONALSONVILLE...AND MOVING EAST AT 40 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  DONALSONVILLE BY 1000 PM EST...
  7 MILES SOUTH OF COLQUITT BY 1010 PM EST...

THIS STORM HAS HAD A HISTORY OF PRODUCING LARGE HAIL UP TO GOLFBALL
SIZE. IF YOU ARE IN THE PATH OF THIS STORM...TAKE COVER INSIDE A
STURDY STRUCTURE IMMEDIATELY

RELAY REPORTS OF SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE IN
TALLAHASSEE AT (8 5 0) 9 4 2 8 8 3 3. OR...YOU MAY CONTACT THE
NEAREST LAW ENFORCEMENT AGENCY OR YOUR COUNTY EMERGENCY MANAGEMENT.
THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 300 AM EST SUNDAY MORNING/200
AM CST SUNDAY MORNING/ FOR SOUTHEAST ALABAMA AND CENTRAL FLORIDA AND
SOUTHWESTERN GEORGIA.

LAT...LON 3121 8469 3114 8467 3108 8466 3104 8467
      3101 8468 3099 8500 3100 8500 3100 8504
      3103 8506 3111 8505 3114 8501
TIME...MOT...LOC 0249Z 262DEG 36KT 3104 8499

$$

14-MROCZKA

1 follow-up statement

000 
WWUS52 KTAE 010304
SVSTAE

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
1004 PM EST SAT FEB 28 2009

ALC069-GAC087-099-201-253-010313-
/O.CAN.KTAE.SV.W.0048.000000T0000Z-090301T0330Z/
HOUSTON AL-SEMINOLE GA-DECATUR GA-MILLER GA-EARLY GA-
1003 PM EST SAT FEB 28 2009

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL EARLY...
SOUTHWESTERN MILLER...NORTHWESTERN DECATUR...NORTHERN SEMINOLE AND
EXTREME SOUTHEASTERN HOUSTON COUNTIES IS CANCELLED...

AT 1000 PM EST NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED 
THAT THE STORM THAT PROMPTED THE WARNING HAD WEAKENED BELOW
SEVERE LIMITS. HOWEVER...GUSTY WINDS TO 40 MPH...SMALL HAIL...
AND VERY HEAVY RAINFALL IS STILL EXPECTED WITH THIS STORM.

RELAY REPORTS OF SEVERE WEATHER TO THE NATIONAL WEATHER SERVICE IN
TALLAHASSEE AT (8 5 0) 9 4 2 8 8 3 3. OR...YOU MAY CONTACT THE
NEAREST LAW ENFORCEMENT AGENCY OR YOUR COUNTY EMERGENCY MANAGEMENT.
THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 300 AM EST SUNDAY MORNING/200
AM CST SUNDAY MORNING/ FOR SOUTHEAST ALABAMA AND CENTRAL FLORIDA AND
SOUTHWESTERN GEORGIA.

LAT...LON 3121 8469 3114 8467 3108 8466 3104 8467
      3101 8468 3099 8500 3100 8500 3100 8504
      3103 8506 3111 8505 3114 8501
TIME...MOT...LOC 0303Z 262DEG 36KT 3106 8483

$$

14-MROCZKA

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 Tallahassee, FL wrote its last area forecast discussion before this severe thunderstorm warning went out at Feb 28, 9:25 PM EST, 25 minutes earlier.

Area forecast discussion, Feb 28, 9:25 PM EST, 25 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TALLAHASSEE FL
925 PM EST SAT FEB 28 2009

.UPDATE...MID/UPPER LOW EVIDENT IN WATER VAPOR IMAGERY DROPPING
QUICKLY TO THE SOUTHEAST THROUGH AR THIS EVENING. THIS IS ENHANCING
THE DIFFLUENCE ALOFT DOWNSTREAM OVER THE TRI-STATE REGION. SURFACE
COLD FRONT CONTINUES TO SINK SOUTHEAST INTO OUR NORTHWEST ZONES.
CONVERGENCE MAXIMIZED AHEAD OF THE BOUNDARY COMBINED WITH IMPRESSIVE
LOW/MID LEVEL SHEAR AND INSTABILITY HAS MAINTAINED BANDS OF INTENSE
CONVECTION. TORNADO WATCH #43 WAS ISSUED JUST PRIOR TO 00Z FOR ALL
EXCEPT QUITMAN AND RANDOLPH COUNTIES IN SOUTHWEST GA. NUMEROUS SVR
TSTM WARNINGS AND A FEW TOR WARNINGS HAVE BEEN ISSUED THIS AFTERNOON
AND EVENING. MOST OF THE SEVERE REPORTS RECEIVED HAVE BEEN WIND
DAMAGE...LARGE HAIL AND FUNNEL CLOUDS. RADAR TRENDS INDICATE THAT
SEVERE THREAT WILL BE ENDING FROM NORTHWEST TO SOUTHEAST TONIGHT
INTO THE OVERNIGHT PERIOD. WILL BE ISSUING A ZONE UPDATE DURING THE
NEXT HOUR OR TWO TO CLEAR OUR NORTHWESTERN COUNTIES FROM THE TORNADO
WATCH.

&&

.MARINE...LATEST OBS SHOW SOUTHERLY WINDS 15-20 KT AND 4 FT SEAS AT
THE BUOYS. COLD FRONT HAS PASSED THE MOB BUOY (42040) WITH A WIND
SHIFT TO NORTHWEST AND SCA WIND SPEEDS. SCA CRITERIA ACROSS OUR
WATERS WILL BEGIN LATER TONIGHT OVER THE WESTERN LEGS AND SPREAD
EAST BEHIND THE COLD FRONT. FREQUENT GUSTS TO GALE FORCE ARE STILL
FORECAST...SO THE GALE WARNING WILL REMAIN IN EFFECT FROM THE
OVERNIGHT HOURS THROUGH LATE SUNDAY NIGHT.

&&

.AVIATION...MAIN LINE OF INTENSE CONVECTION HAS CLEARED KDHN...WITH
A CONTINUED THREAT FOR THE REMAINING TERMINALS THROUGH LATE TONIGHT.
SOUTH TO SOUTHWEST WINDS WILL SWING AROUND TO THE NORTHWEST AND
INCREASE TO 15-20 KT AND GUSTY BEHIND THE COLD FRONT. MVFR CIGS WILL
THEN PREVAIL WITH PERIODS OF LIGHT RAIN AND BLUSTERY NORTHWESTERLY
WINDS ON SUNDAY.

&&

.FIRE WEATHER...NO CONCERNS FOR SUNDAY. FIRE WEATHER WATCH REMAINS
IN EFFECT FOR ALL FL ZONES ON MONDAY DUE TO POSSIBLE LONG DURATIONS
OF LOW RH.

&&

.PRELIMINARY POINT TEMPS/POPS...
TALLAHASSEE  46 50 29 58 28/ 70 30 10 00 00
PANAMA CITY  46 50 33 55 34/ 70 20 00 00 00
DOTHAN       41 45 28 51 28/ 60 40 10 00 00
ALBANY       44 47 31 53 30/ 70 50 10 00 00
VALDOSTA     46 47 30 53 30/ 70 50 10 00 00
CROSS CITY   51 52 30 57 29/ 60 50 00 00 00

&&

.TAE WATCHES/WARNINGS/ADVISORIES...
AL...NONE.
GA...NONE.
FL...FIRE WEATHER WATCH ALL ZONES FOR MONDAY.
GM...GALE WARNING LATE TONIGHT THROUGH LATE SUNDAY NIGHT.

&&

JAMSKI

Hazardous weather outlook, Feb 28, 6:03 AM EST, 15 hours 47 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE TALLAHASSEE FL
603 AM EST SAT FEB 28 2009

ALZ065>069-FLZ007>019-026>029-034-GAZ120>131-142>148-155>161-
GMZ730-750-755-765-770-775-011115-
COFFEE-DALE-HENRY-GENEVA-HOUSTON-INLAND WALTON-COASTAL WALTON-
HOLMES-WASHINGTON-JACKSON-BAY-CALHOUN-GULF-FRANKLIN-GADSDEN-LEON-
JEFFERSON-MADISON-LIBERTY-WAKULLA-TAYLOR-LAFAYETTE-DIXIE-QUITMAN-
CLAY-RANDOLPH-TERRELL-DOUGHERTY-LEE-WORTH-TURNER-TIFT-BEN HILL-
IRWIN-EARLY-MILLER-BAKER-MITCHELL-COLQUITT-COOK-BERRIEN-SEMINOLE-
DECATUR-GRADY-THOMAS-BROOKS-LOWNDES-LANIER-
APALACHEE BAY OR COASTAL WATERS FROM KEATON BEACH TO OCHLOCKONEE
RIVER FL OUT TO 20 NM-
COASTAL WATERS FROM APALACHICOLA TO DESTIN FL OUT 20 NM-
COASTAL WATERS FROM  OCHLOCKONEE RIVER TO APALACHICOLA FL OUT TO
20 NM-
COASTAL WATERS FROM  SUWANNEE RIVER TO KEATON BEACH OUT 20 NM-
WATERS FROM APALACHICOLA TO DESTIN FL FROM 20 TO 60 NM-
WATERS FROM  SUWANNEE RIVER TO APALACHICOLA FL FROM 20 TO 60 NM-
603 AM EST SAT FEB 28 2009 /503 AM CST SAT FEB 28 2009/

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST ALABAMA...
SOUTHWEST AND SOUTH CENTRAL GEORGIA...AND THE FLORIDA BIG BEND
AND PANHANDLE...AND ADJACENT COASTAL WATERS.

.DAY ONE...TODAY AND TONIGHT...

...SLIGHT RISK OF SEVERE WEATHER TODAY AND TONIGHT...

...GALE WATCH TONIGHT AND SUNDAY...

A STRONG COLD FRONT WILL APPROACH FROM THE WEST TODAY...BRINGING
NUMEROUS SHOWERS AND THUNDERSTORMS. SOME OF THESE STORMS MAY BE
SEVERE...ESPECIALLY THIS AFTERNOON AND TONIGHT. THE MAIN THREAT
WILL BE LARGE HAIL AND DAMAGING WINDS...BUT AN ISOLATED TORNADO
CAN NOT BE RULED OUT. THERE IS A HIGH RISK OF RIP CURRENTS TODAY
ALONG THE FLORIDA PANHANDLE BEACHES.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY...
THUNDERSTORMS WILL END FROM WEST TO EAST EARLY SUNDAY MORNING.
LIGHT RAIN WILL LINGER INTO SUNDAY AFTERNOON...ESPECIALLY IN
GEORGIA AND ALABAMA. THERE MAY BE ENOUGH COLD AIR FOR SOME OF THE
RAIN TO MIX WITH OR CHANGE TO LIGHT SNOW...MAINLY FROM ALBANY AND
DOTHAN NORTHWARD. NO SNOW ACCUMULATION IS EXPECTED DUE TO THE
RELATIVELY WARM GROUND TEMPERATURES. WINDY CONDITIONS ARE
EXPECTED...WITH GUSTS TO GALE FORCE OVER THE COASTAL WATERS. FAIR
WEATHER IS EXPECTED FOR THE REMAINDER OF THE WEEK...WITH A LIGHT
FREEZE POSSIBLE MONDAY AND TUESDAY MORNINGS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED TODAY AND TONIGHT.

FOR ADDITIONAL INFORMATION...VISIT THE NATIONAL WEATHER SERVICE
WEBSITE ON THE INTERNET AT WEATHER.GOV...THEN CLICK ON YOUR AREA
OF INTEREST ON THE NATIONAL MAP.

FOURNIER

In the hours before

Local storm report, Feb 28, 7:10 PM EST, 2 hours 40 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
710 PM EST SAT FEB 28 2009

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

0523 PM     TSTM WND DMG     SNEADS                  30.71N 84.92W
02/28/2009                   JACKSON            FL   EMERGENCY MNGR

            SEVERAL TREES SNAPPED. PARTIAL ROOF OFF SCHOOL.

&&

DUGGAN

Local storm report, Feb 28, 7:56 PM EST, 1 hour 54 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
756 PM EST SAT FEB 28 2009

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

0745 PM     TSTM WND DMG     3 N CUFFIETOWN          31.78N 83.82W
02/28/2009                   WORTH              GA   LAW ENFORCEMENT

            ROOF LIFTED OFF A HOME ON GLEATON ROAD.

&&

JAMSKI

Special weather statement, Feb 28, 7:58 PM EST, 1 hour 52 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
758 PM EST SAT FEB 28 2009

FLZ019-GAZ159-160-010145-
BROOKS-LOWNDES-MADISON-
758 PM EST SAT FEB 28 2009

...A SIGNIFICANT WEATHER ALERT IS IN EFFECT FOR BROOKS AND LOWNDES
COUNTIES IN SOUTHWEST GEORGIA AND MADISON COUNTY IN THE FLORIDA BIG
BEND...

* UNTIL 845 PM EST

AT 754 PM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 11 MILES SOUTH OF QUITMAN...MOVING EAST AT 30
MPH. THIS STORM SHOULD REMAIN TO THE NORTH OF THE CITY OF MADISON.

WINDS UP TO 50 MPH ARE EXPECTED WITH THIS STORM.

RELAY REPORTS OF SIGNIFICANT WEATHER TO THE NATIONAL WEATHER SERVICE
IN TALLAHASSEE AT (8 5 0) 9 4 2 8 8 3 3. OR...YOU MAY CONTACT THE
NEAREST LAW ENFORCEMENT AGENCY OR YOUR COUNTY EMERGENCY MANAGEMENT.
THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE.

17-GOULD

Local storm report, Feb 28, 8:45 PM EST, 1 hour 5 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
845 PM EST SAT FEB 28 2009

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

0840 PM     HAIL             NNW NEW HOPE            30.95N 85.88W
02/28/2009  E1.75 INCH       HOLMES             FL   PUBLIC

            GOLF BALL SIZED HAIL REPORTED.

&&

JAMSKI

Special weather statement, Feb 28, 8:54 PM EST, 56 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
854 PM EST SAT FEB 28 2009

GAZ125-126-010245-
DOUGHERTY-LEE-
854 PM EST SAT FEB 28 2009

...A SIGNIFICANT WEATHER ALERT IS IN EFFECT FOR DOUGHERTY AND LEE
COUNTIES IN SOUTHWEST GEORGIA...

* UNTIL 945 PM EST

AT 850 PM EST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 10 MILES EAST OF LEARY...OR 11 MILES SOUTHWEST OF
ALBANY...MOVING EAST AT 35 MPH.

THIS STORM WILL BE NEAR...
  ALBANY BY 910 PM EST.
  EAST ALBANY BY 915 PM EST.
  TURNER CITY BY 920 PM EST.

WINDS 40 TO 50 MPH ARE EXPECTED WITH THIS STORM.

ALSO...THIS STORM IS CAPABLE OF PRODUCING TORRENTIAL DOWNPOURS WHICH
MAY CAUSE LOCALIZED FLOODING OF STREETS AND LOW LYING AREAS.

RELAY REPORTS OF SIGNIFICANT WEATHER TO THE NATIONAL WEATHER SERVICE
IN TALLAHASSEE AT (8 5 0) 9 4 2 8 8 3 3. OR...YOU MAY CONTACT THE
NEAREST LAW ENFORCEMENT AGENCY OR YOUR COUNTY EMERGENCY MANAGEMENT.
THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE.

38-GODSEY

Local storm report, Feb 28, 9:18 PM EST, 32 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TALLAHASSEE FL
918 PM EST SAT FEB 28 2009

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

0655 PM     TSTM WND DMG     1 N LEESBURG            31.75N 84.17W
02/28/2009                   LEE                GA   EMERGENCY MNGR

            A MOBILE HOME WAS MOVED OFF ITS FOUNDATION.

&&

JAMSKI

The office that day

Everything else NWS Tallahassee, FL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Feb 28, 7:14 PM EST	Severe Thunderstorm Warning	TAE	Turner, Worth	46 min
Feb 28, 7:56 PM EST	Tornado Warning	TAE	Grady	18 min
Feb 28, 8:00 PM EST	Severe Thunderstorm Warning	TAE	Tift, Turner, Worth	45 min
Feb 28, 9:23 PM EST	Severe Thunderstorm Warning	TAE	Baker, Early	52 min
Feb 28, 10:21 PM EST	Severe Thunderstorm Warning	TAE	Decatur, Seminole	39 min
Mar 1, 2:28 AM EST	Severe Thunderstorm Warning	TAE	Lowndes	17 min
Mar 1, 5:15 AM EST	Wind Advisory	TAE	Baker, Ben Hill, Berrien, Brooks, Calhoun, Clay and 20 more	14 hr
Mar 1, 2:16 PM EST	Winter Weather Advisory	TAE	Baker, Ben Hill, Berrien, Calhoun, Clay, Colquitt and 13 more	3 hr
Mar 1, 2:32 PM EST	Fire Weather Watch	TAE	Baker, Ben Hill, Berrien, Brooks, Calhoun, Clay and 20 more	24 hr
Mar 1, 2:48 PM EST	Freeze Warning	TAE	Baker, Ben Hill, Berrien, Brooks, Calhoun, Clay and 20 more	18 hr
Feb 28, 7:31 PM EST	Severe Thunderstorm Warning	TAE	Geneva, Houston	44 min
Feb 28, 8:17 PM EST	Severe Thunderstorm Warning	TAE	Geneva	43 min
Feb 28, 8:40 PM EST	Severe Thunderstorm Warning	TAE	Geneva, Houston	35 min
Feb 28, 9:17 PM EST	Severe Thunderstorm Warning	TAE	Houston	28 min

Nearby

Severe Thunderstorm Warnings in Georgia, 2009 Severe Thunderstorm Warnings in Alabama, 2009 Every severe thunderstorm warning in 2009

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.