Alert archive / Florida / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 33, NWS Melbourne, FL

June 18, 2015Lake County, Florida

NWS Melbourne, FL issued this severe thunderstorm warning at Jun 18, 2015, 6:17 PM EDT for Lake County, Florida. It was in force for 28 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: Jun 18, 2015, 6:17 PM EDT (22:17 UTC)
Expired: Jun 18, 2015, 6:45 PM EDT
In force: 28 min
Issued by: NWS Melbourne, FL
Area: Storm-based polygon

County Lake County, FL

The radar

The Melbourne radar (KMLB), 123 km from the middle of the area, began a volume at 22:18 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.

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 nearest sounding before it

Cape Canaveral, FL (KXMR), launched 12:00Z, 10.3 hours before the alert went out and 123 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: 1010 J/kg
Mixed-layer CIN: -22 J/kg
Mixed-layer LCL: 894 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 52 m²/s²
0-3 km storm-relative helicity: 109 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.8

Open this sounding in Storm Lab

The text

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

026 
WUUS52 KMLB 182217
SVRMLB
FLC069-182245-
/O.NEW.KMLB.SV.W.0033.150618T2217Z-150618T2245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MELBOURNE FL
617 PM EDT THU JUN 18 2015

THE NATIONAL WEATHER SERVICE IN MELBOURNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHERN LAKE COUNTY IN EAST CENTRAL FLORIDA...

* UNTIL 645 PM EDT

* AT 616 PM EDT...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
  CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM
  WAS LOCATED OVER FERNDALE. THIS STORM WAS NEARLY STATIONARY. NICKEL
  SIZE HAIL MAY ALSO ACCOMPANY THE DAMAGING WINDS.

* LOCATIONS IMPACTED INCLUDE...
  TAVARES...GROVELAND...HOWEY-IN-THE-HILLS...FERNDALE AND CLERMONT. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...HAIL... DEADLY 
LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION...MOVE TO AN 
INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY 
RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER 
COVERS THE ROAD.

IN ADDITION TO HAIL AND DAMAGING WINDS...EXCESSIVE CLOUD TO GROUND 
LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS IMMEDIATELY. 
LIGHTNING IS ONE OF NATURES LEADING KILLERS. REMEMBER... IF YOU CAN 
HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING.

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

LAT...LON 2879 8178 2870 8166 2854 8166 2855 8183
TIME...MOT...LOC 2216Z 110DEG 1KT 2863 8172 

$$

KELLY

1 follow-up statement

021 
WWUS52 KMLB 182236
SVSMLB

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
636 PM EDT THU JUN 18 2015

FLC069-182245-
/O.EXP.KMLB.SV.W.0033.000000T0000Z-150618T2245Z/
LAKE FL-
636 PM EDT THU JUN 18 2015

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN LAKE COUNTY WILL
EXPIRE AT 645 PM EDT...
        
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE 
LIMITS. THEREFORE THE WARNING WILL BE ALLOWED TO EXPIRE. HOWEVER 
HEAVY RAIN IS STILL POSSIBLE WITH THIS THUNDERSTORM.

LAT...LON 2879 8178 2870 8166 2854 8166 2855 8183
TIME...MOT...LOC 2233Z 110DEG 1KT 2863 8172 

$$

KELLY

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 Melbourne, FL wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 18, 2:44 PM EDT, 3 hours 33 minutes earlier.

Area forecast discussion, Jun 18, 2:44 PM EDT, 3 hours 33 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MELBOURNE FL
244 PM EDT THU JUN 18 2015

.DISCUSSION...
SLIGHTLY HIGHER MOISTURE LED TO A HEALTHY CUMULUS FIELD LATE THIS
MORNING AND AN EARLIER ONSET TO CONVECTION...HOWEVER...UPDRAFTS HAVING
A HARD TIME MAINTAINING THEMSELVES...EVIDENCE OF THE LIGHT WIND
FIELD...DRY AIR...AND RELATIVE STABLE CONDITIONS OVER THE FORECAST
AREA. EAST COAST SEA BREEZE WILL CONTINUE TO TREK INLAND AND
SPARK ISOLATED SHOWERS AND PERHAPS A THUNDERSTORM. BOUNDARY-
SPARKED CONVECTION WILL LIKELY CONTINUE INTO THE EVENING WITH
PERHAPS SOME ENHANCEMENT ACROSS LAKE COUNTY WHERE EAST AND WEST
COAST BOUNDARIES WILL MERGE BEFORE SUNSET. RETAINED SOME SLIGHT
CHANCE POPS AFTER SUNSET TO ACCOUNT FOR SHOWERS FROM REMNANT
BOUNDARY COLLISIONS.

FRI-SUN...REMNANTS OF BILL AND ITS ASSOCIATED TROUGH WILL BEGIN
TO CHIP AWAY AT DEEP LAYER RIDGE OVER FLORIDA AS IT MOVES TOWARDS
THE MID ATLANTIC THIS WEEKEND. SURFACE RIDGE AXIS GETS SHUNTED
EVER SO SLIGHTLY TO THE SOUTH...STILL IN THE VICINITY OF CENTRAL
FLORIDA...KEEPING WINDS GENERALLY LIGHT AND SOUTHERLY. WITH
CONTINUED GENERAL RIDGING THROUGHOUT THE TROPOSPHERE...EXPECTING
ONLY ISOLATED-SCATTERED CONVECTION ACROSS THE INTERIOR WHERE THE
BEST BOUNDARY COLLISIONS WILL TAKE PLACE. HIGHS RANGING FROM NEAR
90 ALONG THE IMMEDIATE COAST TO MID 90S ACROSS THE INTERIOR.

FROM PREVIOUS DISCUSSION...
MON-WED...WEAK SFC TROUGH ACROSS THE SOUTHEAST STATES SHIFTS SFC
RIDGE AXIS TOWARD THE SRN FL PENINSULA INTO NEXT WEEK BUT LOW LEVEL
WINDS LOOK LIGHT ENOUGH FOR SEA BREEZE TO MOVE INLAND EACH AFT WITH
BEST AFT RAIN CHANCES REMAINING OVER THE INTERIOR EACH AFT. GFS
INDICATING SOME DRIER AIR WORKING IN WHICH COULD LIMIT POPS...BUT
FOR NOW WILL KEEP CHANCE POPS UP TO 30-40% IN THE FORECAST FOR
INLAND LOCATIONS. HEAT SHOULD CONTINUE TO PERSIST WITH HIGHS IN THE
LOW 90S COAST TO MID 90S INTERIOR.

&&

.AVIATION...
COASTAL SITES VFR THROUGH TONIGHT WITH SE FLOW BEHIND SEA BREEZE.
WILL MAINTAIN VCTS ACROSS INLAND SITES WHERE INLAND MOVING SEA
BREEZE SHOULD SPARK ISOLATED/SCATTERED SHRA/TSRA.

&&

.MARINE...
TONIGHT...ENHANCED SE FLOW ALONG THE COAST BEHIND SEA BREEZE WILL
DIMINISH AFTER SUNSET AND BECOME SOUTHERLY. SLIGHT NOCTURNAL
INCREASE IN THE SOUTHERLY BREEZE IS INDICATED OFFSHORE FROM THE
CAPE NORTHWARD TO 12-15 KNOTS. STILL SEAS WILL BE AT OR BELOW 3
FEET.

FROM PREVIOUS DISCUSSION...
FRI-MON...SFC RIDGE AXIS WILL GENERALLY REMAIN IN PLACE ACROSS
CENTRAL FL THROUGH THE PERIOD. S/SW WINDS LATE IN THE NIGHT AND
EARLY MORNING WILL BECOME S/SE INTO THE AFT AS EAST COAST SEA
BREEZE DEVELOPS AND MOVES INLAND EACH AFT. WIND SPEEDS EXPECTED TO
REMAIN BELOW 15 KNOTS WITH SEAS RANGING FROM 1-3 FEET. AFT
CONVECTION OVER LAND IS EXPECTED TO REMAIN MAINLY ACROSS THE
INTERIOR WITH THREAT FOR OFFSHORE MOVING STORMS VERY LOW.

&&

.PRELIMINARY POINT TEMPS/POPS...
DAB  75  92  74  91 /  20  20  20  20
MCO  76  95  75  93 /  30  40  20  40
MLB  76  91  74  89 /  10  20  10  20
VRB  74  92  74  90 /  10  20  10  10
LEE  77  96  76  93 /  30  50  30  40
SFB  77  95  76  93 /  30  40  20  30
ORL  77  95  76  93 /  30  40  20  40
FPR  73  91  72  90 /  10  20  10  10

&&

.MLB WATCHES/WARNINGS/ADVISORIES...
FL...NONE.
AM...NONE.
&&

FORECAST...ULRICH
AVIATION/RADAR...CRISTALDI/MOSES

Hazardous weather outlook, Jun 18, 10:00 AM EDT, 8 hours 17 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MELBOURNE FL
1000 AM EDT THU JUN 18 2015

AMZ550-552-555-570-572-575-FLZ041-044>047-053-054-058-059-064-141-
144-147-182100-
FLAGLER BEACH TO VOLUSIA-BREVARD COUNTY LINE 0-20 NM-VOLUSIA-
BREVARD COUNTY LINE TO SEBASTIAN INLET 0-20 NM-
SEBASTIAN INLET TO JUPITER INLET 0-20 NM-FLAGLER BEACH TO VOLUSIA-
BREVARD COUNTY LINE 20-60 NM-VOLUSIA-
BREVARD COUNTY LINE TO SEBASTIAN INLET 20-60 NM-
SEBASTIAN INLET TO JUPITER INLET 20-60 NM-INLAND VOLUSIA COUNTY-
NORTHERN LAKE COUNTY-ORANGE-SEMINOLE-SOUTHERN BREVARD COUNTY-
OSCEOLA-INDIAN RIVER-OKEECHOBEE-ST. LUCIE-MARTIN-
COASTAL VOLUSIA COUNTY-SOUTHERN LAKE COUNTY-
NORTHERN BREVARD COUNTY-
1000 AM EDT THU JUN 18 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL FLORIDA.

.DAY ONE...TODAY AND TONIGHT.

.THUNDERSTORM IMPACT...
SLIGHTLY HIGHER MOISTURE IS FORECAST TODAY. THIS SHOULD ALLOW STORMS
TO FORM A LITTLE EARLIER ALONG THE INLAND MOVING EAST COAST SEA
BREEZE. STILL...MOST ACTIVITY IS EXPECTED WEST OF INTERSTATE 95.

GREATER BOUNDARY INTERACTIONS ALONG AND WEST OF INTERSTATE 4
DURING THE AFTERNOON AND EVENING SHOULD PRODUCE SCATTERED COVERAGE
AND POSSIBLY A FEW STRONG STORMS. THE MAIN HAZARD WILL BE LIGHTNING
STRIKES WHICH COULD BE FREQUENT IN A FEW OF THE INTERIOR STORMS.

.EXCESSIVE HEAT IMPACT...
HOT TEMPERATURES COMBINED WITH AVERAGE FLORIDA HUMIDITY LEVELS
WILL RESULT IN HEAT INDICES AROUND 100 AGAIN THIS AFTERNOON...
WITH VALUES BETWEEN 100 AND 105 OVER THE INTERIOR COUNTIES. STAY WELL
HYDRATED AND TAKE OCCASIONAL BREAKS IN AIR CONDITIONING IF YOU ARE
PLANNING OUTDOOR PHYSICAL ACTIVITY.

.MARINE THUNDERSTORM GUST IMPACT...
A FEW MORE AFTERNOON STORMS ARE FORECAST TODAY ALONG THE INLAND
MOVING SEA BREEZE BOUNDARIES. WIND GUSTS AROUND 40 MPH WILL BE
POSSIBLE WITH ISOLATED STORMS...ESPECIALLY ACROSS THE INTERIOR
COUNTIES.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.
SLIGHTLY HIGHER MOISTURE...AND WEAKENING OF MID TO UPPER LEVEL
HIGH PRESSURE RIDGE NORTH OF THE REGION...SHOULD ALLOW FOR
SCATTERED AFTERNOON STORMS THROUGH THE WEEKEND...MAINLY OVER
INLAND COUNTIES.

HIGH TEMPERATURES WILL STILL REACH THE MID 90S OVER THE CENTRAL
FLORIDA INTERIOR THROUGH EARLY NEXT WEEK...WITH MAXIMUM HEAT INDEX
VALUES CONTINUING TO REACH 100 TO 105 DEGREES.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION IS NOT ANTICIPATED TODAY.

LASCODY/CRISTALDI

In the hours before

Special weather statement, Jun 18, 3:55 PM EDT, 2 hours 22 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
355 PM EDT THU JUN 18 2015

FLZ044-182045-
NORTHERN LAKE COUNTY FL-
355 PM EDT THU JUN 18 2015

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN LAKE COUNTY UNTIL
445 PM EDT...

AT 354 PM EDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM OVER
PAISLEY. THIS STORM WAS NEARLY STATIONARY.

WIND GUSTS UP TO 50 MPH WILL BE POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
EUSTIS...MOUNT DORA...CASSIA...PAISLEY AND MOUNT PLYMOUTH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THE PRIMARY THREATS WILL BE CLOUD TO GROUND LIGHTNING AND STRONG WIND
GUSTS...WHICH CAN CAUSE UNSECURED OBJECTS TO BLOW AROUND...SNAP TREE
LIMBS...CAUSE POWER OUTAGES OR CAPSIZE SMALL BOATS. HEAVY RAINFALL
WILL TEMPORARILY REDUCE VISIBILITY. SEEK SHELTER INDOORS UNTIL THE
STORM PASSES.

BOATERS SHOULD BE AWARE THAT STRONG WIND GUSTS SOMETIMES OCCUR WELL
AWAY FROM THE HEAVY RAIN AND LIGHTNING ASSOCIATED WITH STORMS.

HEAVY RAINFALL IS ALSO OCCURRING WITH THIS STORM...WHICH WILL REDUCE
VISIBILITY AND MAY LEAD TO TEMPORARY FLOODING OF LOW LYING AND POOR
DRAINAGE AREAS. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE SEVERAL MILES AWAY FROM A THUNDERSTORM. SEEK
SHELTER INSIDE A BUILDING OR VEHICLE. OPEN SHELTERS FOUND IN PARKS...
ON BEACHES OR GOLF COURSES OFFER NO PROTECTION FROM THE DANGERS OF
LIGHTNING.

&&

LAT...LON 2896 8166 2905 8166 2905 8164 2913 8164
      2912 8151 2910 8150 2910 8147 2906 8146
      2906 8145 2895 8138 2880 8143 2880 8165
      2896 8168
TIME...MOT...LOC 1954Z 081DEG 3KT 2902 8155

KELLY

Special weather statement, Jun 18, 5:05 PM EDT, 1 hour 12 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
505 PM EDT THU JUN 18 2015

FLZ044>046-182145-
NORTHERN LAKE COUNTY FL-ORANGE FL-SEMINOLE FL-
505 PM EDT THU JUN 18 2015

...SIGNIFICANT WEATHER ADVISORY FOR EAST CENTRAL LAKE...NORTHWESTERN
ORANGE AND NORTHWESTERN SEMINOLE COUNTIES UNTIL 545 PM EDT...

AT 505 PM EDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR
MOUNT PLYMOUTH...MOVING SOUTH AT 30 MPH.

WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
APOPKA...LAKE MARY...LONGWOOD...CASSIA AND ZELLWOOD.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THE PRIMARY THREATS WILL BE CLOUD TO GROUND LIGHTNING AND STRONG WIND
GUSTS...WHICH CAN CAUSE UNSECURED OBJECTS TO BLOW AROUND...SNAP TREE
LIMBS...CAUSE POWER OUTAGES OR CAPSIZE SMALL BOATS. HEAVY RAINFALL
WILL TEMPORARILY REDUCE VISIBILITY. SEEK SHELTER INDOORS UNTIL THE
STORM PASSES.

BOATERS SHOULD BE AWARE THAT STRONG WIND GUSTS SOMETIMES OCCUR WELL
AWAY FROM THE HEAVY RAIN AND LIGHTNING ASSOCIATED WITH STORMS.

HEAVY RAINFALL IS ALSO OCCURRING WITH THIS STORM...WHICH WILL REDUCE
VISIBILITY AND MAY LEAD TO TEMPORARY FLOODING OF LOW LYING AND POOR
DRAINAGE AREAS. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED ROADWAYS.

FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE SEVERAL MILES AWAY FROM A THUNDERSTORM. SEEK
SHELTER INSIDE A BUILDING OR VEHICLE. OPEN SHELTERS FOUND IN PARKS...
ON BEACHES OR GOLF COURSES OFFER NO PROTECTION FROM THE DANGERS OF
LIGHTNING.

&&

LAT...LON 2894 8149 2895 8135 2892 8135 2892 8136
      2889 8135 2889 8137 2887 8136 2885 8136
      2884 8134 2870 8135 2871 8163
TIME...MOT...LOC 2105Z 009DEG 27KT 2880 8144

BRAGAW

Special weather statement, Jun 18, 6:15 PM EDT, 2 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MELBOURNE FL
615 PM EDT THU JUN 18 2015

FLZ045-053-144-182345-
OSCEOLA FL-SOUTHERN LAKE COUNTY FL-ORANGE FL-
615 PM EDT THU JUN 18 2015

...SIGNIFICANT WEATHER ADVISORY FOR SOUTH CENTRAL LAKE...SOUTHWESTERN
ORANGE AND NORTHWESTERN OSCEOLA COUNTIES UNTIL 745 PM EDT...

AT 611 PM EDT...DOPPLER RADAR WAS TRACKING MULTIPLE BOUNDARIES
CONVERGING ON THE FOUR CORNERS AREA AND POINTS EASTWARD. THESE
BOUNDARIES WILL MERGE OVER SOUTHWEST ORANGE...NORTHWEST OSCEOLA...
AND SOUTH LAKE COUNTIES THROUGH SUNSET. STRONG THUNDERSTORMS WITH
FREQUENT TO EXCESSIVE LIGHTNING...STRONG WINDS GUSTS OVER 40 MPH...
AND TORRENTIAL RAIN AREA EXPECTED TO DEVELOP IN THIS AREA AS SUNSET
APPROACHES.

LOCATIONS IMPACTED INCLUDE...
ORLANDO...KISSIMMEE...OCOEE...WINTER GARDEN AND WINDERMERE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THE PRIMARY THREATS WILL BE CLOUD TO GROUND LIGHTNING AND STRONG WIND
GUSTS...WHICH CAN CAUSE UNSECURED OBJECTS TO BLOW AROUND...SNAP TREE
LIMBS...CAUSE POWER OUTAGES OR CAPSIZE SMALL BOATS. HEAVY RAINFALL
WILL TEMPORARILY REDUCE VISIBILITY. SEEK SHELTER INDOORS UNTIL THE
STORM PASSES.

BOATERS SHOULD BE AWARE THAT STRONG WIND GUSTS SOMETIMES OCCUR WELL
AWAY FROM THE HEAVY RAIN AND LIGHTNING ASSOCIATED WITH STORMS.

&&

LAT...LON 2873 8175 2847 8120 2814 8135 2814 8152
      2820 8152 2826 8156 2826 8166 2835 8166
      2835 8178 2842 8182
TIME...MOT...LOC 2211Z 332DEG 66KT 2846 8166

BRAGAW

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 18, 3:55 PM EDT	Special Weather Statement	MLB	Lake	50 min
Jun 18, 4:17 PM EDT	Severe Thunderstorm Warning	MLB	Lake	43 min
Jun 18, 5:05 PM EDT	Special Weather Statement	MLB	Lake	40 min
Jun 18, 6:15 PM EDT	Special Weather Statement	MLB	Orange	90 min
Jun 18, 6:39 PM EDT	Severe Thunderstorm Warning	MLB	Lake	36 min

Nearby

Severe Thunderstorm Warnings in Florida, 2015 Every severe thunderstorm warning 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.