Alert archive / Illinois / Severe Thunderstorm Warnings in 2014
Severe Thunderstorm Warning 25, NWS Chicago, IL
NWS Chicago, IL issued this severe thunderstorm warning at May 12, 2014, 5:53 PM CDT for LaSalle County, Illinois. It was in force for 67 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- May 12, 2014, 5:53 PM CDT (22:53 UTC)
- Expired
- May 12, 2014, 7:00 PM CDT
- In force
- 67 min
- Issued by
- NWS Chicago, IL
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
County LaSalle County, IL
The radar
The Chicago radar (KLOT), 73 km from the middle of the area, began a volume at 22:54 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.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| May 12, 3:49 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Lincoln, IL (KILX), launched 12:00Z, 10.9 hours before the alert went out and 135 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
- 1710 J/kg
- Mixed-layer CIN
- -43 J/kg
- Mixed-layer LCL
- 785 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 212 m²/s²
- 0-3 km storm-relative helicity
- 200 m²/s²
- Significant tornado parameter
- 1.3
- Supercell composite
- 6.7
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 Chicago, IL wrote its last area forecast discussion before this severe thunderstorm warning went out at May 12, 5:26 PM CDT, 27 minutes earlier.
Area forecast discussion, May 12, 5:26 PM CDT, 27 minutes before
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</html>Hazardous weather outlook, May 12, 4:11 PM CDT, 1 hour 42 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
411 PM CDT MON MAY 12 2014
ILZ003>006-008-010>014-019>023-032-033-039-INZ001-002-010-011-019-
132115-
WINNEBAGO-BOONE-MCHENRY-LAKE ILLINOIS-OGLE-LEE-DE KALB-KANE-
DUPAGE-COOK-LA SALLE-KENDALL-GRUNDY-WILL-KANKAKEE-LIVINGSTON-
IROQUOIS-FORD-LAKE INDIANA-PORTER-NEWTON-JASPER-BENTON-
411 PM CDT MON MAY 12 2014 /511 PM EDT MON MAY 12 2014/
THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL ILLINOIS...
NORTHEAST ILLINOIS AND NORTHWEST INDIANA.
.DAY ONE...TONIGHT.
WEATHER HAZARDS EXPECTED:
THUNDERSTORMS...THE MOST INTENSE COULD PRODUCE:
WIND GUSTS OVER 60 MPH.
HAIL UP TO THE SIZE OF GOLF BALLS.
TORRENTIAL DOWNPOURS.
AND FREQUENT CLOUD TO GROUND LIGHTNING.
AREAS AFFECTED AND TIMING:
SCATTERED THUNDERSTORMS WILL CONTINUE ACROSS NORTHERN ILLINOIS
THIS EVENING. ADDITIONAL THUNDERSTORMS WILL SPREAD ACROSS AREAS
WEST OF INTERSTATE 55 DURING THE MIDDLE TO LATE EVENING AND THEN
ACROSS THE REST OF THE AREA OVERNIGHT.
DISCUSSION:
THE PRESENCE OF A MOIST AND UNSTABLE AIR MASS WILL FAVOR
SCATTERED THUNDERSTORMS THROUGH THIS EVENING WHICH MAY PRODUCE
LARGE HAIL AND DAMAGING WIND GUSTS. A COLD FRONT WILL MOVE
ACROSS THE REGION LATER TONIGHT INTO TUESDAY MORNING. ADDITIONAL
THUNDERSTORMS ARE EXPECTED TO DEVELOP AHEAD OF THIS FRONT AND
MOVE ACROSS THE AREA FROM MID TO LATE EVENING INTO THE OVERNIGHT
HOURS. WHILE THESE THUNDERSTORMS WILL LIKELY BEGIN TO WEAKEN BY
LATE EVENING...THERE IS A POTENTIAL THAT THEY COULD STILL POSE A
SEVERE THREAT AS THEY INTO NORTH CENTRAL ILLINOIS.
.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.
THERE IS A CHANCE OF THUNDERSTORMS TUESDAY MORNING.
.SPOTTER INFORMATION STATEMENT...
SPOTTERS WILL BE NEEDED THIS EVENING.
&&
LMZ740>745-132115-
WINTHROP HARBOR TO WILMETTE HARBOR-
WILMETTE HARBOR TO NORTHERLY ISLAND-
NORTHERLY ISLAND TO CALUMET HARBOR-CALUMET HARBOR TO GARY-
GARY TO BURNS HARBOR-BURNS HARBOR TO MICHIGAN CITY-
411 PM CDT MON MAY 12 2014
THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE ILLINOIS NEARSHORE
WATERS OF LAKE MICHIGAN AND THE INDIANA NEARSHORE WATERS OF LAKE
MICHIGAN.
.DAY ONE...TONIGHT.
STRONG WINDS HAZARDOUS TO SMALL CRAFT WILL CONTINUE THROUGH THIS
EVENING.
THUNDERSTORMS WILL INCREASE IN COVERAGE THIS EVENING AND CONTINUE
OVERNIGHT. SOME OF THE STORMS COULD PRODUCE HAIL UP TO 1 INCH IN
DIAMETER AND WIND GUSTS OVER 35 KNOTS.
.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.
THERE IS A CHANCE OF THUNDERSTORMS TUESDAY MORNING.
&&
LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868-
870-872-874-876-878-132115-
LAKE MICHIGAN FROM MICHIGAN CITY IN TO ST. JOSEPH MI 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM SEUL CHOIX POINT TO ROCK ISLAND PASSAGE 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN SOUTH OF A LINE FROM SEUL CHOIX POINT TO THE
MACKINAC BRIDGE AND NORTH OF A LINE FROM CHARLEVOIX MI TO SOUTH
FOX ISLAND 5 NM OFFSHORE-
LAKE MICHIGAN FROM CHARLEVOIX TO POINT BETSIE MI 5 NM OFFSHORE TO
MID LAKE-
LAKE MICHIGAN FROM POINT BETSIE TO MANISTEE MI 5 NM OFFSHORE TO
MID LAKE-
LAKE MICHIGAN FROM ROCK ISLAND PASSAGE TO STURGEON BAY WI-
LAKE MICHIGAN FROM STURGEON BAY TO TWO RIVERS WI 5 NM OFFSHORE TO
MID LAKE-
LAKE MICHIGAN FROM TWO RIVERS TO SHEBOYGAN WI 5 NM OFFSHORE TO
MID LAKE-
LAKE MICHIGAN FROM SHEBOYGAN TO PORT WASHINGTON WI 5 NM OFFSHORE
TO MID LAKE-
LAKE MICHIGAN FROM PORT WASHINGTON TO NORTH POINT LIGHT WI 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM NORTH POINT LIGHT TO WIND POINT WI 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM WIND POINT WI TO WINTHROP HARBOR IL 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM WINTHROP HARBOR TO WILMETTE HARBOR IL 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM WILMETTE HARBOR IL TO MICHIGAN CITY IN 5 NM
OFFSHORE TO MID LAKE-
LAKE MICHIGAN FROM PENTWATER TO MANISTEE MI 5 NM OFFSHORE TO MID
LAKE-
LAKE MICHIGAN FROM WHITEHALL TO PENTWATER MI 5 NM OFFSHORE TO MID
LAKE-
LAKE MICHIGAN FROM GRAND HAVEN TO WHITEHALL MI 5 NM OFFSHORE TO
MID LAKE-
LAKE MICHIGAN FROM HOLLAND TO GRAND HAVEN MI 5 NM OFFSHORE TO MID
LAKE-
LAKE MICHIGAN FROM SOUTH HAVEN TO HOLLAND MI 5 NM OFFSHORE TO MID
LAKE-
LAKE MICHIGAN FROM ST. JOSEPH TO SOUTH HAVEN MI 5 NM OFFSHORE TO
MID LAKE-
411 PM CDT MON MAY 12 2014
THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE OPEN WATERS OF LAKE
MICHIGAN.
.DAY ONE...TONIGHT.
OCCASIONAL THUNDERSTORMS ARE EXPECTED...WITH SOME POSSIBLY PRODUCING
LARGE HAIL AND WIND GUSTS OVER 35 KNOTS.
DENSE FOG IS POSSIBLE OVER THE NORTHERN HALF OF THE LAKE.
.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY.
THERE IS A CHANCE OF THUNDERSTORMS TUESDAY MORNING.
&&
VISIT US AT HTTP://WEATHER.GOV/CHICAGO (ALL LOWERCASE)
FOLLOW US ON FACEBOOK...TWITTER...AND YOUTUBE AT:
WWW.FACEBOOK.COM/US.NATIONALWEATHERSERVICE.CHICAGO.GOV
WWW.TWITTER.COM/NWSCHICAGO
WWW.YOUTUBE.COM/NWSCHICAGOIn the hours before
Local storm report, May 12, 3:24 PM CDT, 2 hours 29 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
324 PM CDT MON MAY 12 2014
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0317 PM HAIL SOUTH BELOIT 42.48N 89.03W
05/12/2014 E2.00 INCH WINNEBAGO IL TRAINED SPOTTER
1.5 TO 2 INCH DIAMETER HAIL NEAR ROUTE 2 AND PRAIRIE
ROAD.
0319 PM HAIL SOUTH BELOIT 42.48N 89.03W
05/12/2014 E1.75 INCH WINNEBAGO IL LAW ENFORCEMENT
QUARTER TO GOLFBALL SIZE HAIL.
&&The office that day
Everything else NWS Chicago, IL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 11, 7:43 PM CDT | Severe Thunderstorm Warning | LOT | Iroquois | 62 min |
| May 11, 7:58 PM CDT | Flash Flood Warning | LOT | Ford, Livingston | 3 hr |
| May 11, 9:15 PM CDT | Flash Flood Warning | LOT | Ford, Iroquois | 6 hr |
| May 11, 9:16 PM CDT | River Flood Advisory | LOT | Will | 53 hr |
| May 11, 11:09 PM CDT | Severe Thunderstorm Warning | LOT | Ford, Iroquois | 51 min |
| May 12, 9:09 AM CDT | Small Craft Advisory | LOT | 12 hr | |
| May 12, 9:34 AM CDT | Marine Dense Fog Advisory | LOT | 23 hr | |
| May 12, 2:56 PM CDT | Severe Thunderstorm Warning | LOT | Boone, Winnebago | 49 min |
| May 12, 6:15 PM CDT | Special Weather Statement | LOT | Lake | 45 min |
| May 12, 6:20 PM CDT | Special Marine Warning | LOT | 85 min | |
| May 12, 6:27 PM CDT | Severe Thunderstorm Warning | LOT | Cook, Lake | 48 min |
| May 12, 6:32 PM CDT | Severe Thunderstorm Warning | LOT | DeKalb, LaSalle | 58 min |
| May 12, 6:39 PM CDT | Severe Thunderstorm Warning | LOT | Cook, DuPage | 36 min |
| May 11, 7:03 PM CDT | Severe Thunderstorm Warning | LOT | Porter | 42 min |
| May 11, 7:39 PM CDT | Flash Flood Warning | LOT | Jasper, Lake, Newton, Porter | 6 hr |
| May 11, 7:54 PM CDT | Tornado Warning | LOT | Jasper, Newton | 51 min |
Nearby
Severe Thunderstorm Warnings in Illinois, 2014Every severe thunderstorm warning in 2014
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.