Alert archive / Missouri / Excessive Heat Warnings in 2010

Excessive Heat Warning 1, NWS St. Louis, MO

June 19, 20104 counties in Missouri; Madison County, Monroe County, Saint Clair County, Illinois

NWS St. Louis, MO issued this excessive heat warning at Jun 19, 2010, 2:42 AM CDT for 4 counties in Missouri; Madison County, Monroe County, Saint Clair County, Illinois. It was in force for 5 days. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jun 19, 2010, 2:42 AM CDT (07:42 UTC)
Expired
Jun 23, 2010, 7:00 PM CDT
In force
5 days
Issued by
NWS St. Louis, MO

Counties Madison County, IL, Monroe County, IL, Saint Clair County, IL, City of Saint Louis, MO, Jefferson County, MO, Saint Charles County, MO, Saint Louis County, MO

The radar

The St Louis radar (KLSX), 40 km from the middle of the area, began a volume at 07:45 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 nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 7.7 hours before the alert went out and 341 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-pSkew-T log-p diagram, Davenport, at 00:00Z on 2010-06-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1389 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 00:00Z on 2010-06-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 231 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1389 J/kg
Mixed-layer CIN
-99 J/kg
Mixed-layer LCL
1139 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
231 m²/s²
0-3 km storm-relative helicity
325 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.4

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this excessive heat warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS St. Louis, MO wrote its last area forecast discussion before this excessive heat warning went out at Jun 19, 2:33 AM CDT, 9 minutes earlier.

Area forecast discussion, Jun 19, 2:33 AM CDT, 9 minutes before
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Hazardous weather outlook, Jun 18, 8:31 PM CDT, 6 hours 11 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE ST LOUIS MO
831 PM CDT FRI JUN 18 2010

ILZ058>060-064-065-069-070-074-079-095>102-MOZ018-019-026-027-
034>036-041-042-047>052-059>065-072>075-084-085-099-191200-
GREENE IL-MACOUPIN IL-MONTGOMERY IL-BOND IL-FAYETTE IL-CLINTON IL-
MARION IL-WASHINGTON IL-RANDOLPH IL-ADAMS IL-BROWN IL-PIKE IL-
CALHOUN IL-JERSEY IL-MADISON IL-ST. CLAIR IL-MONROE IL-KNOX MO-
LEWIS MO-SHELBY MO-MARION MO-MONROE MO-RALLS MO-PIKE MO-BOONE MO-
AUDRAIN MO-MONITEAU MO-COLE MO-OSAGE MO-CALLAWAY MO-MONTGOMERY MO-
LINCOLN MO-GASCONADE MO-WARREN MO-ST. CHARLES MO-FRANKLIN MO-
ST. LOUIS MO-ST. LOUIS CITY MO-JEFFERSON MO-CRAWFORD MO-
WASHINGTON MO-ST. FRANCOIS MO-STE. GENEVIEVE MO-IRON MO-
MADISON MO-REYNOLDS MO-
831 PM CDT FRI JUN 18 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EASTERN AND
CENTRAL MISSOURI AS WELL AS WEST CENTRAL AND SOUTHWEST ILLINOIS.

.DAY ONE...TONIGHT

THUNDERSTORMS WILL BE LIKELY...MAINLY FOR PARTS OF NORTHEAST
MISSOURI AND WEST CENTRAL ILLINOIS. SOME STORMS MAY BE
SEVERE...CONTAINING DAMAGING WINDS AND LARGE HAIL...FOR AREAS
NORTH OF INTERSTATE 70 WHERE THERE IS A SLIGHT RISK. FOR FURTHER
INFORMATION ON CONVECTIVE WATCHES...PLEASE REFER TO THE LATEST
STORM PREDICTION CENTER WATCH PRODUCTS.

A WARM AND MUGGY NIGHT IS EXPECTED THAT WILL OFFER LITTLE RELIEF
FROM THE HOT DAY ON FRIDAY. LOW TEMPERATURES WILL ONLY DROP INTO
THE MID TO UPPER 70S. A HEAT ADVISORY CONTINUES FOR MOST OF EAST
CENTRAL AND SOUTHEAST MISSOURI AND SOUTHWEST ILLINOIS...INCLUDING
THE SAINT LOUIS METRO AREA. FOR FURTHER INFORMATION...PLEASE REFER
TO THE ADVISORY PRODUCT.

MODERATE RIVER FLOODING IS OCCURRING ALONG PORTIONS OF THE LA
MOINE RIVER AT RIPLEY...THE MISSISSIPPI RIVER AT CHESTER...AND
PARTS OF THE MISSOURI RIVER. PLEASE SEE THE APPROPRIATE FLOOD
STATEMENTS FOR SPECIFIC DETAILS.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

THERE IS A CHANCE FOR THUNDERSTORMS ACROSS MUCH OF THE AREA
THROUGH SUNDAY NIGHT...ESPECIALLY FOR PARTS OF NORTHEAST MISSOURI
AND WEST CENTRAL ILLINOIS. SOME STORMS MAY BE SEVERE ON SUNDAY AND
SUNDAY NIGHT.

DANGEROUS LEVELS OF HEAT AND HUMIDITY WILL PERSIST INTO NEXT
WEEK...WITH HEAT INDEX VALUES EXPECTED TO TOP 100 DEGREES EACH DAY
THROUGH AT LEAST MONDAY...WITH THE POTENTIAL OF CONTINUING INTO
LATE NEXT WEEK. THIS WILL ESPECIALLY BE THE CASE FOR MOST OF EAST
CENTRAL AND SOUTHEAST MISSOURI AND SOUTHWEST ILLINOIS...INCLUDING
THE SAINT LOUIS METRO AREA...WHERE A HEAT ADVISORY REMAINS IN
EFFECT THROUGH LATE MONDAY AFTERNOON. FOR FURTHER INFORMATION...
PLEASE REFER TO THE ADVISORY PRODUCT.LITTLE RELIEF WILL OCCUR AT
NIGHT WITH WARM AND MUGGY CONDITIONS.

MODERATE RIVER FLOODING IS OCCURRING ALONG PORTIONS OF THE LA
MOINE RIVER AT RIPLEY...THE MISSISSIPPI RIVER AT CHESTER...AND
PARTS OF THE MISSOURI RIVER. PLEASE SEE THE APPROPRIATE FLOOD
STATEMENTS FOR SPECIFIC DETAILS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS LIKELY FOR PARTS OF NORTHEAST MISSOURI AND
WEST CENTRAL ILLINOIS THIS EVENING...AND MAY OCCUR AS FAR SOUTH AS
INTERSTATE 70 LATER TONIGHT.

&&

FOR A GRAPHICAL VERSION OF THIS INFORMATION SEE OUR
WEBPAGE AT (LOWERCASE)... HTTP://WWW.WEATHER.GOV/LSX/?N=HWO1

TES

In the hours before

Local storm report, Jun 19, 2:04 AM CDT, 38 minutes before
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Local storm report, Jun 19, 2:13 AM CDT, 29 minutes before
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Special weather statement, Jun 19, 2:14 AM CDT, 28 minutes before
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Local storm report, Jun 19, 2:20 AM CDT, 22 minutes before
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Local storm report, Jun 19, 2:22 AM CDT, 20 minutes before
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Local storm report, Jun 19, 2:38 AM CDT, 4 minutes before
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The office that day

Everything else NWS St. Louis, MO issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 18, 11:50 PM CDTSevere Thunderstorm WarningLSXKnox, Lewis, Marion, Monroe, Shelby40 min
Jun 19, 1:28 AM CDTSevere Thunderstorm WarningLSXBoone, Moniteau26 min
Jun 19, 11:49 AM CDTRiver Flood WarningLSXLewis68 days
Jun 19, 11:49 AM CDTRiver Flood WarningLSXMarion29 days
Jun 19, 11:49 AM CDTRiver Flood WarningLSXMarion27 days
Jun 19, 2:32 PM CDTSevere Thunderstorm WarningLSXBoone, Cole, Moniteau28 min
Jun 19, 2:56 PM CDTSevere Thunderstorm WarningLSXCallaway, Cole, Osage34 min
Jun 19, 3:29 AM CDTAreal Flood AdvisoryLSXBond, Clinton6 hr
Jun 19, 4:06 AM CDTAreal Flood AdvisoryLSXWashington6 hr

Nearby

Excessive Heat Warnings in Missouri, 2010Excessive Heat Warnings in Illinois, 2010Every excessive heat warning in 2010

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.