Heavy Rainfall in the East Wednesday; Hot Temperatures Continue in Coastal Southern California
Heavy to excessive rainfall may lead to flooding Wednesday over southwest Pennsylvania into northern West Virginia, and western Maryland. Flood Watches have been issued. An extended period of hot weather will continue for parts of coastal southern California including Los Angeles through Thursday. Heat Advisories remain in effect.
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Isolated severe thunderstorms developed Thursday night over sections of the forecast area. The thunderstorms produced strong winds up to 70 mph, large hail, and heavy rainfall. The strongest storm developed over Branch county Michigan Thursday evening. Ample instability along with moderate wind shear (change in wind speed and direction with height) allowed the updraft of this thunderstorm to become intense. Strong rotation developed in this storm in response to the wind shear present, allowing the development of what is known as a supercell thunderstorm. This supercell thunderstorm dropped hail up to the size of golf balls along with wind gusts to 70 mph as it moved southeast into northeast Indiana and northwest Ohio. A funnel cloud was also observed with this storm just west of Edon Ohio at 843 pm EDT. Below are a few radar images taken from when the thunderstorm updraft was very intense. At this time the storm was producing golf ball size hail over Williams and Defiance counties.
Very intense radar returns are evident in the above image. The large hail produced an intense return of 70 dbz at approximately 24,000 ft above the ground. Meteorologists correlate reflectivity to temperature levels aloft in determining hail potential.
The above image displays radar reflectivity at about 35,000 ft above ground level. This image was taken about same time as the image above. Again, very “hard” returns of 60 dbz can be seen emanating from near the top of the thunderstorm right near the middle of the hail growth zone.
The following sequence of pictures shows the collapse of the hail core in western Defiance county. Also, evident on the left hand side of the first image is the echo free vault of the thunderstorm. An echo free vault is an attribute of a very intense thunderstorm as it indicates that the updraft is strong enough to suspend precipitation particles (such as hail) aloft for a long period of time.
A 3D rendering of this storm, at 840 pm EDT over Edon Ohio, below clearly shows the deep ice core within this intense supercell. Spiral indicates the intense mesocyclone occurring within the updraft and caught on video by storm chaser Steve Ferree. Note the brief funnel that develops below the base of this intense mesocyclone.
NWUS53 KIWX 270431
LSRIWX
PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE NORTHERN INDIANA
1231 AM EDT FRI JUL 27 2007
..TIME.. ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE.. ....MAG.... ..COUNTY LOCATION.. ST.. ...SOURCE....
..REMARKS..
0705 PM HAIL 4 E BRONSON 41.87N 85.11W
07/26/2007 E0.50 INCH BRANCH MI TRAINED SPOTTER
HALF INCH HAIL
0713 PM HAIL UPLAND 40.46N 85.51W
07/26/2007 E0.75 INCH GRANT IN TRAINED SPOTTER
PENNY SIZE HAIL IN UPLAND
0716 PM TSTM WND DMG 4 SE UPLAND 40.42N 85.46W
07/26/2007 GRANT IN EMERGENCY MNGR
TREES AND POWERLINES DOWN
0722 PM TSTM WND DMG 1 S HARTFORD CITY 40.44N 85.37W
07/26/2007 BLACKFORD IN LAW ENFORCEMENT
SEVERAL TREES AND POWERLINES DOWN SOUTH OF HARTFORD
CITY
0745 PM TSTM WND DMG 2 WNW FREMONT 41.74N 84.97W
07/26/2007 STEUBEN IN EMERGENCY MNGR
WIDESPREAD TREES AND POWERLINES DOWN ACROSS
COUNTY...WORSE DAMAGE NEAR TOLL ROAD WEST OF FREMONT
0750 PM HAIL FREMONT 41.73N 84.93W
07/26/2007 E1.00 INCH STEUBEN IN AMATEUR RADIO
THREE QUARTER TO ONE INCH HAIL IN FREMONT
0756 PM TSTM WND GST 3 W FREMONT 41.73N 84.99W
07/26/2007 E70 MPH STEUBEN IN EMERGENCY MNGR
EMA DAMAGE SURVEY...STRAIGHT LINE WIND DAMAGE...NORTH
STRIP MALL SIGNIFICANTLY DAMAGED...SOFFIT BLOWN
OUT...ROOF DAMAGE...WINDOW BROKEN...MANY TREES DOWN WITH
ONE ON CAR. 20 INCH DIAMETER TREE UPROOTED. TREES AND A
LIGHTPOLE DOWN AT THE HOLLIDAY INN EXPRESS ALONG WITH
SEVERAL OTHER REPORTS OF TREES DOWN IN THE AREA.
0805 PM HAIL 4 NNE ANGOLA 41.70N 84.97W
07/26/2007 E1.75 INCH STEUBEN IN TRAINED SPOTTER
GOLF BALL SIZE HAIL FALLING
0808 PM HAIL FREMONT 41.73N 84.93W
07/26/2007 E0.75 INCH STEUBEN IN TRAINED SPOTTER
PENNY SIZE HAIL
0900 PM HAIL EDGERTON 41.45N 84.75W
07/26/2007 E0.88 INCH WILLIAMS OH LAW ENFORCEMENT
NICKEL SIZE HAIL
0903 PM HAIL EDGERTON 41.45N 84.75W
07/26/2007 E1.00 INCH WILLIAMS OH LAW ENFORCEMENT
QUARTER SIZE HAIL
0912 PM HAIL 1 NE EDGERTON 41.46N 84.74W
07/26/2007 E0.75 INCH WILLIAMS OH TRAINED SPOTTER
PENNY SIZE HAIL
0916 PM HAIL 1 NE EDGERTON 41.46N 84.74W
07/26/2007 E1.75 INCH WILLIAMS OH TRAINED SPOTTER
GOLF BALL SIZE HAIL WINDS ESTIMATED AT 50 MPH
0923 PM HAIL 3 E EDGERTON 41.45N 84.69W
07/26/2007 E1.75 INCH WILLIAMS OH LAW ENFORCEMENT
GOLF BALL SIZE HAIL ON US 6 EAST OF EDGERTON
0933 PM HAIL 1 W FARMER 41.38N 84.65W
07/26/2007 E1.75 INCH DEFIANCE OH LAW ENFORCEMENT
GOLF BALL SIZE HAIL
1023 PM TSTM WND DMG 2.5 SE FAYETTE 41.65N 84.29W
07/26/2007 FULTON OH LAW ENFORCEMENT
TOP OF BARN TAKEN OFF AND TREES DOWN
&&
$$
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