Alert archive / South Carolina / Severe Thunderstorm Warnings in 2017
Severe Thunderstorm Warning 158, NWS Greenville-Spartanburg, SC
NWS Greenville-Spartanburg, SC issued this severe thunderstorm warning at Jul 6, 2017, 3:34 PM EDT for Anderson County, Greenville County, Pickens County, South Carolina. It was in force for 41 min. 5 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
- Jul 6, 2017, 3:34 PM EDT (19:34 UTC)
- Expired
- Jul 6, 2017, 4:15 PM EDT
- In force
- 41 min
- Issued by
- NWS Greenville-Spartanburg, SC
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Anderson County, SC, Greenville County, SC, Pickens County, SC
The radar
The Greer radar (KGSP), 27 km from the middle of the area, began a volume at 19:35 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 |
|---|---|---|---|
| Jul 6, 3:40 PM EDT | TSTM WND DMG | 3 Sw Powdersville, SC | SOCIAL MEDIA REPORTED A TREE DOWN ON MT. AIRY CHURCH RD IN EASLEY. TIME ESTIMATED FROM RADAR. |
| Jul 6, 3:40 PM EDT | TSTM WND DMG | 3 Wsw Powdersville, SC | 911 CALL CENTER REPORTED NUMEROUS TREES DOWN IN SOUTHERN EASLEY. |
| Jul 6, 3:44 PM EDT | TSTM WND DMG | 1 Wnw Powdersville, SC | 911 CALL CENTER REPORTED NUMEROUS TREES DOWN IN THE TOWN OF POWDERSVILLE. |
| Jul 6, 3:48 PM EDT | TSTM WND DMG | 2 Sse Welcome, SC | SOCIAL MEDIA REPORTED A LARGE LIMB DOWN ON POWERLINES AT THE 185-85 INTERCHANGE IN GREENVILLE COUNTY |
| Jul 6, 4:00 PM EDT | TSTM WND DMG | 5 Sw Powdersville, SC | ROUGHLY A DOZEN TREES SNAPPED OR UPROOTED IN A YARD ON WREN CROSSING LN IN EASLEY. |
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 5 storm reports to this severe thunderstorm warning; the first came 6 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 nearest sounding before it
Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 7.6 hours before the alert went out and 243 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.
- Mixed-layer CAPE
- 1341 J/kg
- Mixed-layer CIN
- -32 J/kg
- Mixed-layer LCL
- 947 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- -90 m²/s²
- 0-3 km storm-relative helicity
- -78 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
793
WUUS52 KGSP 061934
SVRGSP
SCC007-045-077-062015-
/O.NEW.KGSP.SV.W.0158.170706T1934Z-170706T2015Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Greenville-Spartanburg SC
334 PM EDT THU JUL 6 2017
The National Weather Service in Greenville-Spartanburg has issued a
* Severe Thunderstorm Warning for...
Southeastern Greenville County in Upstate South Carolina...
Northeastern Anderson County in Upstate South Carolina...
Southeastern Pickens County in Upstate South Carolina...
* Until 415 PM EDT
* At 334 PM EDT, a severe thunderstorm was located 5 miles south of
Easley, moving east at 20 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
* Locations impacted include...
Easley, Greenville Eastside, West Greenville, Mauldin,
Simpsonville, Five Forks, Fountain Inn, Welcome, Powdersville and
Piedmont.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Scattered trees and power lines will be blown down in the warned
area. Seek shelter inside an interior room.
Please report damaging winds, hail, or flooding to the National
Weather Service Greenville-Spartanburg by calling toll free, 1, 800,
2 6 7, 8 1 0 1, or by posting on our Facebook page, or Tweet it using
hashtag nwsgsp. Your message should describe the event and the
specific location where it occurred.
&&
LAT...LON 3464 8274 3486 8270 3483 8219 3481 8217
3467 8220 3459 8224 3454 8224
TIME...MOT...LOC 1934Z 277DEG 19KT 3474 8260
HAIL...0.75IN
WIND...60MPH
$$
JPT1 follow-up statement
068
WWUS52 KGSP 061959
SVSGSP
Severe Weather Statement
National Weather Service Greenville-Spartanburg SC
359 PM EDT THU JUL 6 2017
SCC007-045-077-062015-
/O.CON.KGSP.SV.W.0158.000000T0000Z-170706T2015Z/
Greenville SC-Anderson SC-Pickens SC-
359 PM EDT THU JUL 6 2017
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM EDT
FOR SOUTHEASTERN GREENVILLE...NORTHEASTERN ANDERSON AND EAST CENTRAL
PICKENS COUNTIES...
At 359 PM EDT, a severe thunderstorm was located 9 miles south of
Greenville Downtown, or near Piedmont, moving east at 20 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to trees and power lines.
Locations impacted include...
Greenville Eastside, West Greenville, Mauldin, Simpsonville, Five
Forks, Fountain Inn, Welcome, Powdersville, Piedmont and Williamston.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Scattered trees and power lines will be blown down in the warned
area. Seek shelter inside an interior room.
Please report damaging winds, hail, or flooding to the National
Weather Service Greenville-Spartanburg by calling toll free, 1, 800,
2 6 7, 8 1 0 1, or by posting on our Facebook page, or Tweet it using
hashtag nwsgsp. Your message should describe the event and the
specific location where it occurred.
&&
LAT...LON 3463 8269 3485 8257 3483 8219 3481 8217
3467 8220 3455 8226
TIME...MOT...LOC 1959Z 277DEG 19KT 3472 8244
HAIL...0.75IN
WIND...60MPH
$$
JPTWhat 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 Jul 6, 2:58 PM EDT, 36 minutes earlier.
Area forecast discussion, Jul 6, 2:58 PM EDT, 36 minutes before
Area Forecast Discussion
National Weather Service Greenville-Spartanburg SC
258 PM EDT Thu Jul 6 2017
.SYNOPSIS...
Seasonable temperatures and mainly afternoon showers and
thunderstorms will continue through Saturday. A front will push
through the area Saturday night, bringing somewhat drier and cooler
air for Sunday and Monday. More humid and unsettled weather are
expected by Tuesday as that front creeps back into the area from
the south.
&&
.NEAR TERM /THROUGH FRIDAY/...
As of 245 PM: Scattered showers and thunderstorms continue to
develop over the mtns/foothills and back across n Georgia and ern
TN. Area east of the Blue Ridge seems primed for another round
of scattered strong/severe storms again this afternoon/early eve,
with sbCAPE on the order of 2500-3500 J/kg. Similar to yesterday,
we should have another excellent downburst environment with mid
level dry air and dCAPE greater than 800 J/kg. Expect a few severe
storms with wind damage the primary threat. The shear is a bit
stronger today, so it will be interesting to see if the storms
can get better organized along cool pools.
Otherwise...the pattern remains persistent, although slowly
progressive, so a refresher on what happened the last few nights
just to our west is instructive. Each night, nocturnal convection
has developed closer to the trof axis, and that seems reasonable
tonight, but with the activity shifted shifted eastward by a
few hundred miles and over the NC mtns. So, after the convective
activity wanes later this evening, have kept a chance of precip
across the NC zones through the overnight hours. On Monday, the
trof axis should move slowly east across the fcst area with the
main short wave moving overhead in the afternoon. The fcst reflects
this with a chance of precip shifting east during the morning and
then to the south in the afternoon. Severe weather chances not as
good as the last few days with better dCAPE kept to the south.
&&
.SHORT TERM /FRIDAY NIGHT THROUGH SUNDAY/...
As of 130 PM Thursday: a long wave trough axis will set up roughly
along the Appalachians for Saturday and Sunday. This should be far
enough east to allow a cold front to push completely thru the CWFA
and usher in some drier, more stable air into the area. The 12z
model consensus looks a bit drier overall than previous runs,
depicting a 1020 mb high building across the Ohio Valley. Saturday
should see at least some isolated showers and tstms as the front
pushes thru and dry air slowly works in from the NW, but moisture
convergence looks weak. By Sunday morning, conditions should be dry.
Temps will be near to slightly above normal Saturday and near to
slightly below normal (with noticeably less humidity) on Sunday.
&&
.LONG TERM /SUNDAY NIGHT THROUGH THURSDAY/...
As of 150 PM Thu: The stalled out front to our south will begin to
drift north Sunday night into Monday which will slowly increase
moisture over southern areas at first. Weak high pressure will
remain over much of western North Carolina through Monday. A
shortwave crossing the Great Lakes Monday night and Tuesday will
have an associated weak cold front moving southeast which may help
to initiate convection for areas north of I-40 by Tuesday evening.
This front to our north will become stationary or nearly so
remaining near the northern parts of WV and VA going into late week.
Upper support for the front moving south will be minimal We will be
in a typical summer pattern of diurnal chances of afternoon and
evening showers and storms.
After weekend Min Temps being near or a little below normal, all Mas
and Mins through the rest of the medium range should be near steady
state normal.
&&
.AVIATION /19Z THURSDAY THROUGH TUESDAY/...
At KCLT: VFR stratocu early this afternoon across the Piedmont
will eventually develop and give way to showers/storms developing
to the west. The situation is persistent, lending creedence to the
idea that another round of TSRA will move across or at least very
near the air field later today, in spite of the differences in the
convection-allowing model guidance. Thus, have opted for a TEMPO for
TSRA in the 21Z-01Z time frame. Environment is supportive of strong
downbursts, so gusty winds are expected near any storms. Showers
should linger into the mid evening, followed by convective debris
cloudiness overnight. The upper trof will be closer to our region
Friday morning, suggesting a better chance for precip on Friday
morning as has been seen off to the west the last few mornings. This
possibility will not be included in the fcst at this time, instead
have opted to bring the chance in at 15Z with morning heating. Wind
should stay SW when not influenced by thunderstorm outflows.
Elsewhere: Again, a persistence forecast, and similar to KCLT. Will
attempt to get the timing for storms in the late afternoon/early
evening. Nocturnal convection a better possibility over the mtns,
but will keep the chances down in the 30 pct range. KAVL and KHKY
also have the best chance of seeing any restrictions overnight.
Outlook: Moist and unsettled weather will continue through Saturday.
Thunderstorms may become more numerous Friday as an upper wave
passes followed by a cold front. Nocturnal restrictions can be
expected in any locations receiving heavy rainfall, and also in
the mountain valleys. Some drying is indicated by Sunday into
early next week.
Confidence Table...
19-01Z 01-07Z 07-13Z 13-18Z
KCLT High 100% High 100% High 100% High 100%
KGSP High 100% High 100% High 100% High 100%
KAVL High 100% High 100% High 96% High 100%
KHKY High 100% High 100% High 100% High 100%
KGMU High 100% High 100% High 100% High 100%
KAND High 100% High 100% High 100% High 100%
The percentage reflects the number of guidance members agreeing
with the scheduled TAF issuance flight rule category. Complete hourly
experimental aviation forecast consistency tables and ensemble forecasts
are available at the following link:
www.weather.gov/gsp/aviation
&&
.GSP WATCHES/WARNINGS/ADVISORIES...
GA...None.
NC...None.
SC...None.
&&
SYNOPSIS...DEO
NEAR TERM...PM
SHORT TERM...ARK
LONG TERM...DEO
AVIATION...PMHazardous weather outlook, Jul 6, 4:53 AM EDT, 10 hours 41 minutes before
Hazardous Weather Outlook National Weather Service Greenville-Spartanburg SC 453 AM EDT Thu Jul 6 2017 GAZ010-017-018-026-028-029-NCZ033-035>037-048>053-056>059-062>065- 068>072-082-501>510-SCZ001>014-019-070900- Rabun-Habersham-Stephens-Franklin-Hart-Elbert-Avery-Alexander- Iredell-Davie-Madison-Yancey-Mitchell-Swain-Haywood-Buncombe-Catawba- Rowan-Graham-Northern Jackson-Macon-Southern Jackson-Transylvania- Henderson-Cleveland-Lincoln-Gaston-Mecklenburg-Cabarrus-Union- 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-Chester-Greenwood- 453 AM EDT Thu Jul 6 2017 This Hazardous Weather Outlook is for northeast Georgia, piedmont North Carolina, western North Carolina and upstate South Carolina. .DAY ONE...Today and Tonight. Isolated to scattered thunderstorms are expected today, with the greatest coverage during the afternoon. Dangerous cloud-to-ground lightning is possible with any of these thunderstorms. Conditions in the upper atmosphere are favorable for a few of them to cause severe weather in the form of damaging wind gusts. .DAYS TWO THROUGH SEVEN...Friday through Wednesday. ..Friday...No hazardous weather is expected at this time. ..Saturday...No hazardous weather is expected at this time. ..Sunday...No hazardous weather is expected at this time. ..Monday...No hazardous weather is expected at this time. ..Tuesday...No hazardous weather is expected at this time. ..Wednesday...No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Skywarn spotters are requested to forward any reports of damaging winds to our office. Wimberley
In the hours before
Special weather statement, Jul 6, 1:12 PM EDT, 2 hours 22 minutes before
Special Weather Statement
National Weather Service Greenville-Spartanburg SC
112 PM EDT THU JUL 6 2017
NCZ502-504-061745-
Greater Burke NC-Greater Caldwell NC-
112 PM EDT THU JUL 6 2017
...A STRONG THUNDERSTORM WILL IMPACT SOUTHEASTERN CALDWELL AND
CENTRAL BURKE COUNTIES UNTIL 145 PM EDT...
At 111 PM EDT, Doppler radar was tracking a strong thunderstorm over
Morganton, moving northeast at 25 mph.
Locations to be impacted include...
Lenoir, Morganton, Sawmills, Granite Falls, Valdese, Gamewell,
Hudson, Icard, Cajah's Mountain and Drexel.
Wind gusts up to 40 mph and pea size hail will be possible in these
areas.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Gusty winds can blow down trees that are dead, or that have weakened
root systems. Outdoor furniture and similar items can be tossed
around if not anchored. Seek shelter indoors.
&&
LAT...LON 3577 8136 3576 8137 3571 8141 3566 8177
3575 8181 3596 8146
TIME...MOT...LOC 1711Z 246DEG 21KT 3574 8171
ARKSpecial weather statement, Jul 6, 2:08 PM EDT, 1 hour 26 minutes before
Special Weather Statement
National Weather Service Greenville-Spartanburg SC
208 PM EDT THU JUL 6 2017
NCZ065-509-SCZ003-006-061830-
Henderson NC-Polk Mountains NC-Greenville Mountains SC-
Greater Greenville SC-
208 PM EDT THU JUL 6 2017
...A STRONG THUNDERSTORM WILL IMPACT SOUTHEASTERN HENDERSON...
SOUTHWESTERN POLK AND NORTHEASTERN GREENVILLE COUNTIES UNTIL 230 PM
EDT...
At 207 PM EDT, Doppler radar was tracking a strong thunderstorm 12
miles south of Hendersonville, or near Pleasant Ridge State Park,
moving east at 15 mph.
Locations to be impacted include...
Slater-Marietta, Tigerville, Lake Robinson, Pleasant Ridge State
Park, Saluda, Gowensville, North Saluda Reservoir, Tuxedo, Glassy
Mountain and Cleveland.
Wind gusts up to 40 mph and half inch hail will be possible in these
areas.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Gusty winds can blow down trees that are dead, or that have weakened
root systems. Outdoor furniture and similar items can be tossed
around if not anchored. Seek shelter indoors.
&&
LAT...LON 3504 8255 3523 8252 3524 8227 3520 8226
3519 8222 3503 8222 3497 8223
TIME...MOT...LOC 1807Z 278DEG 13KT 3514 8245
ARKSpecial weather statement, Jul 6, 2:32 PM EDT, 1 hour 2 minutes before
Special Weather Statement National Weather Service Greenville-Spartanburg SC 232 PM EDT THU JUL 6 2017 SCZ001-002-004-005-010-061915- Pickens Mountains SC-Greater Pickens SC-Greater Oconee SC- Anderson SC-Oconee Mountains SC- 232 PM EDT THU JUL 6 2017 ...A STRONG THUNDERSTORM WILL IMPACT NORTHWESTERN ANDERSON... SOUTHWESTERN PICKENS AND CENTRAL OCONEE COUNTIES UNTIL 315 PM EDT... At 231 PM EDT, Doppler radar was tracking a strong thunderstorm near Walhalla, moving east at 25 mph. Locations to be impacted include... Clemson, Seneca, Walhalla, Pickens, Central, Pendleton, Liberty, Norris, Six Mile and Salem. Wind gusts up to 45 mph and half inch hail will be possible over these areas. PRECAUTIONARY/PREPAREDNESS ACTIONS... This storm may intensify, so be certain to monitor local radio and tv stations, as well as local cable tv outlets for additional information and possible warnings from the National Weather Service. && LAT...LON 3471 8319 3489 8319 3494 8264 3463 8266 TIME...MOT...LOC 1831Z 271DEG 22KT 3480 8308 JPT
Special weather statement, Jul 6, 2:58 PM EDT, 36 minutes before
Special Weather Statement
National Weather Service Greenville-Spartanburg SC
258 PM EDT THU JUL 6 2017
NCZ068-504-506-508-061945-
Greater Rutherford NC-Cleveland NC-Greater Burke NC-
Eastern McDowell NC-
258 PM EDT THU JUL 6 2017
...A STRONG THUNDERSTORM WILL IMPACT SOUTHEASTERN MCDOWELL...
NORTHEASTERN RUTHERFORD...NORTHWESTERN CLEVELAND AND SOUTHWESTERN
BURKE COUNTIES UNTIL 345 PM EDT...
At 257 PM EDT, Doppler radar was tracking a strong thunderstorm 10
miles north of Rutherfordton, moving northeast at 25 mph.
Locations to be impacted include...
Morganton, Casar, South Mountains State Park, Drexel, Sugar Hill,
Pleasant Grove, Thermal City, Glenwood, Sunshine and Fero.
Wind gusts up to 40 mph and small hail will be possible over these
areas.
LAT...LON 3559 8152 3556 8153 3555 8151 3552 8151
3538 8199 3553 8208 3559 8204 3577 8162
TIME...MOT...LOC 1857Z 244DEG 21KT 3551 8194
JPTSpecial weather statement, Jul 6, 3:24 PM EDT, 10 minutes before
Special Weather Statement
National Weather Service Greenville-Spartanburg SC
324 PM EDT THU JUL 6 2017
NCZ068-069-508-062015-
Greater Rutherford NC-Cleveland NC-Lincoln NC-
324 PM EDT THU JUL 6 2017
...A STRONG THUNDERSTORM WILL IMPACT EAST CENTRAL RUTHERFORD...
WESTERN LINCOLN AND CENTRAL CLEVELAND COUNTIES UNTIL 415 PM EDT...
At 323 PM EDT, Doppler radar was tracking a strong thunderstorm 4
miles north of Forest City, or near Bostic, moving east at 25 mph.
Locations to be impacted include...
Forest City, Spindale, Belwood, Lawndale, Fallston, Polkville,
Ellenboro, Lattimore, Waco and Bostic.
Wind gusts up to 40 mph and pea size hail will be possible over
these areas.
LAT...LON 3542 8141 3542 8145 3535 8139 3534 8139
3529 8191 3548 8196 3557 8159 3557 8158
3556 8157 3557 8153 3557 8146
TIME...MOT...LOC 1923Z 257DEG 22KT 3540 8185
JPTSpecial weather statement, Jul 6, 3:28 PM EDT, 6 minutes before
Special Weather Statement National Weather Service Greenville-Spartanburg SC 328 PM EDT THU JUL 6 2017 SCZ005>007-010-012-062015- Greater Pickens SC-Laurens SC-Anderson SC-Spartanburg SC- Greater Greenville SC- 328 PM EDT THU JUL 6 2017 ...A STRONG THUNDERSTORM WILL IMPACT NORTHWESTERN LAURENS... SOUTHEASTERN GREENVILLE...WEST CENTRAL SPARTANBURG...NORTHEASTERN ANDERSON AND EAST CENTRAL PICKENS COUNTIES UNTIL 415 PM EDT... At 328 PM EDT, Doppler radar was tracking a strong thunderstorm 6 miles southwest of Greenville Downtown, or near Powdersville, moving east at 20 mph. Locations to be impacted include... Greenville Downtown, Greenville Eastside, West Greenville, Mauldin, Simpsonville, Berea, Five Forks, Fountain Inn, Welcome and Powdersville. Wind gusts up to 40 mph and pea size hail will be possible over these areas. LAT...LON 3470 8256 3489 8252 3487 8209 3460 8216 TIME...MOT...LOC 1928Z 279DEG 16KT 3478 8246 JPT
The office that day
Everything else NWS Greenville-Spartanburg, SC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 5, 8:26 PM EDT | Special Weather Statement | GSP | Laurens | 49 min |
| Jul 6, 2:08 PM EDT | Special Weather Statement | GSP | Greenville | 22 min |
| Jul 6, 2:10 PM EDT | Severe Thunderstorm Warning | GSP | Greenville, Spartanburg | 50 min |
| Jul 6, 2:32 PM EDT | Special Weather Statement | GSP | Oconee, Pickens | 43 min |
| Jul 6, 3:10 PM EDT | Severe Thunderstorm Warning | GSP | Anderson, Oconee, Pickens | 65 min |
| Jul 6, 3:28 PM EDT | Special Weather Statement | GSP | Greenville | 47 min |
| Jul 6, 4:17 PM EDT | Special Weather Statement | GSP | Laurens | 43 min |
| Jul 6, 4:20 PM EDT | Special Weather Statement | GSP | Abbeville | 40 min |
| Jul 6, 4:27 PM EDT | Special Weather Statement | GSP | York | 48 min |
| Jul 6, 4:57 PM EDT | Special Weather Statement | GSP | Laurens | 48 min |
| Jul 6, 5:07 PM EDT | Special Weather Statement | GSP | Greenwood | 38 min |
| Jul 6, 5:11 PM EDT | Special Weather Statement | GSP | Oconee | 49 min |
| Jul 6, 5:35 PM EDT | Special Weather Statement | GSP | Chester | 40 min |
| Jul 6, 6:18 PM EDT | Special Weather Statement | GSP | Chester | 27 min |
Nearby
Severe Thunderstorm Warnings in South Carolina, 2017Every severe thunderstorm warning in 2017
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.